JP2009058147A - Heat pump system and operation method thereof - Google Patents

Abstract

A heat pump system capable of preventing a working medium in the form of droplets from being introduced into a compressor and an operation method thereof.
SOLUTION: An expander 3 that depressurizes water in a working medium supply pipe 2 through which water flows, an evaporator 5 that evaporates water from the expander 3 with an external heat medium, and water vapor from the evaporator 5 Circulating steam supply pipe 6, vacuum pump 8 for reducing the pressure in steam supply pipe 6, and steam supply pipe 6 so that the temperature of steam supply pipe 6 reaches the saturation temperature of water in steam supply pipe 6 or higher. A heating device 7 for heating, a compressor 7 that is activated after the steam supply pipe 6 is heated to a temperature equal to or higher than the saturation temperature of water in the steam supply pipe 6, and compresses water vapor from the steam supply pipe 6, and this compressor And a heat medium supply pipe 14 that supplies the water vapor compressed in 7 to the heat utilization facility as a heat medium.
[Selection] Figure 1

Description

  The present invention relates to a heat pump system for supplying a heat medium to heat utilization equipment and an operation method thereof.

  As a measure for improving energy efficiency, the use of energy that has been discarded in the past is regarded as important, and there is a heat pump system as a means to collect and use such energy. Some heat pump systems use a heat source (for example, factory exhaust heat) at a relatively low temperature (for example, about 60 to 80 ° C.) for heating the working medium. Among them, heating is performed by an external heat source. In some cases, the working medium itself is supplied as heat medium to a heat utilization facility (see Patent Document 1, etc.).

  In this type of heat pump, since the saturation temperature of the working medium at normal pressure is higher than the temperature of the external heat source, first, the inside of the heat pump system is set to a negative pressure so that the saturation temperature of the working medium is lower than the temperature of the external heat source. The working medium is evaporated by the heat source. The working medium evaporated in this way is introduced into a compressor (turbo compressor) via a steam supply pipe, and is pressurized, and is supplied to a heat utilization facility as a heat medium.

JP 2007-10243 A

  By the way, since the steam supply pipe of the above technique is left in the atmosphere before the compressor is started, it is held at a temperature lower than the saturation temperature of the working medium (normal temperature). Therefore, when the compressor is started to start the heat pump, some of the working medium that is directed to the compressor via the steam supply pipe may be cooled to the wall surface of the steam supply pipe and condensed into droplets. is there. When the droplets generated in this way are introduced into the compressor, they may collide with the impeller and damage the compressor. Further, when the impeller is damaged, the rotor system may be unbalanced and abnormal vibration may occur.

  The objective of this invention is providing the heat pump system which can prevent the working medium used as the droplet from being introduce | transduced into a compressor, and its operating method.

  (1) In order to achieve the above object, according to the present invention, a working medium supply pipe through which a working medium flows, an expander that depressurizes the working medium from the working medium supply pipe, and an external heat medium flow through. A heat source supply pipe, an evaporator for evaporating the working medium from the expander with the heat medium of the heat source supply pipe, a steam supply pipe through which the working medium from the evaporator flows, and a pressure in the steam supply pipe A vacuum pump to be reduced; a heating device that heats the steam supply pipe so that the temperature of the steam supply pipe reaches a saturation temperature of the working medium in the steam supply pipe; and saturation of the working medium in the steam supply pipe A compressor that is started after the steam supply pipe is heated to a temperature higher than that, compresses the working medium from the steam supply pipe, and heat that supplies the working medium compressed by the compressor to a heat utilization facility as a heat medium. It shall comprise a body feed pipe.

  In the heat pump system configured as described above, if the compressor is started after the steam supply pipe is heated to a temperature equal to or higher than the saturation temperature of the working medium in the steam supply pipe using the heating device, the steam Even when the temperature of the supply pipe is lower than the saturation temperature of the working medium before heating, the working medium can be introduced into the compressor as a gas. Thus, when the heat pump system is started, the working medium is prevented from being introduced into the compressor as droplets, so that the compressor can be prevented from being damaged.

  (2) In the above (1), preferably, during the period from when the compressor is stopped until the entire system is stopped, the heating device has a temperature equal to or higher than the saturation temperature of the working medium in the steam supply pipe. The temperature of the steam supply pipe is maintained, and the vacuum pump discharges the working medium in the steam supply pipe held in a gaseous state by the heating device to the outside.

  (3) Preferably, the vacuum pump according to (1) is configured to supply the steam after the temperature of the steam supply pipe reaches a preheating completion temperature set to be equal to or lower than a saturation temperature of the working medium in the steam supply pipe. The pressure in the piping shall be reduced.

  (4) The above (1) is preferably configured such that when an operation signal is input, a temperature detection unit that detects a temperature of the steam supply pipe, a pressure detection unit that detects a pressure in the steam supply pipe, A notification device for notifying that the temperature of the steam supply pipe has reached or exceeded the saturation temperature of the working medium in the steam supply pipe, and the working medium in the steam supply pipe based on the detection value input from the pressure detecting means. And a control device that calculates a saturation temperature and outputs an operation signal to the notification device when a detected value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium.

  (5) The above (2) is preferably configured such that when an operation signal is input, a temperature detection unit that detects a temperature of the steam supply pipe, a pressure detection unit that detects a pressure in the steam supply pipe, A notification device for notifying that the temperature of the steam supply pipe is maintained at a temperature equal to or higher than the saturation temperature of the working medium in the steam supply pipe, and between the time when the compressor is stopped and the time when the entire system is stopped. Based on the detection value input from the pressure detection means, the saturation temperature of the working medium in the steam supply pipe is calculated, and the detection value input from the temperature detection means is held at or above the calculated saturation temperature of the working medium. And a control device that outputs an operation signal to the notification device.

(6) In the above (3), preferably, when temperature detection means for detecting the temperature of the steam supply pipe, pressure detection means for detecting the pressure in the steam supply pipe, and the first operation signal are input Notifying that the temperature of the steam supply pipe has reached the preheating completion temperature or higher, and when the second operation signal is input, the temperature of the steam supply pipe has reached the saturation temperature of the working medium in the steam supply pipe or higher. A notification device that informs
When the detection value input from the temperature detection means reaches the preheating completion temperature or more, a first operation signal is output to the notification device, and after the first operation signal is output, the pressure detection means A saturation temperature of the working medium in the steam supply pipe is calculated based on the input detection value, and the notification is made when the detection value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium. And a control device that outputs a second operation signal to the device.

  (7) The above (1) is preferably temperature detection means for detecting the temperature of the steam supply pipe, pressure detection means for detecting the pressure in the steam supply pipe, and detection input from the pressure detection means Based on the value, the saturation temperature of the working medium in the steam supply pipe is calculated, and the compressor is started when the detected value input from the temperature detecting means reaches or exceeds the calculated saturation temperature of the working medium. And a control device.

  (8) Preferably, the above (2) includes a temperature detection means for detecting the temperature of the steam supply pipe, a pressure detection means for detecting the pressure in the steam supply pipe, and all the steps after the compressor is stopped. Until the system is stopped, the saturation temperature of the working medium in the steam supply pipe is calculated based on the detection value input from the pressure detection unit, and the detection value input from the temperature detection unit is And a control device for operating the vacuum pump when the temperature is maintained at a temperature equal to or higher than the calculated saturation temperature of the working medium.

  (9) The above (3) is preferably temperature detection means for detecting the temperature of the steam supply pipe, pressure detection means for detecting the pressure in the steam supply pipe, and detection input from the temperature detection means. The vacuum pump is started when the value reaches the preheating completion temperature or more, and after the vacuum pump is started, the working medium in the steam supply pipe is based on the detected value input from the pressure detecting means. And a control device that starts the compressor when the detected value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium.

  (10) In the above (1), preferably, the heating device is a pipe through which an external heat medium flows, and has a pipe portion provided so as to cover the steam supply pipe from the outer peripheral side. To do.

  (11) In the above (4), preferably, the heating device is a pipe through which a heat medium from the outside flows, and has a pipe part provided so as to cover the steam supply pipe from the outer peripheral side, The said temperature detection means shall be attached to the part located in the downstream of the distribution direction of the heat medium in the said pipe part with respect to the said steam supply piping.

  (12) In the above (10) or (11), preferably, the pipe portion is a pipe branched from the heat source supply pipe on the upstream side of the evaporator, and has passed through the outer peripheral side of the steam supply pipe. It is assumed that the pipe is connected to the heat source supply pipe again later.

  (13) In order to achieve the above object, according to the present invention, a working medium supply pipe through which a working medium flows, an expander that depressurizes the working medium from the working medium supply pipe, and an external heat medium flow through. A heat source supply pipe, an evaporator for evaporating the working medium from the expander with the heat medium of the heat source supply pipe, a steam supply pipe through which the working medium from the evaporator flows, and a working medium from the steam supply pipe A compressor that compresses the heat medium, a heat medium supply pipe that supplies a working medium compressed by the compressor as a heat medium to a heat utilization facility, and between the time when the compressor is stopped and the time when the entire system is stopped. A heating device that keeps the temperature of the steam supply pipe above the saturation temperature of the working medium in the steam supply pipe, and a vacuum that discharges the working medium in the steam supply pipe held in a gas state by the heating device to the outside It is assumed that and a pump.

  (14) In order to achieve the above object, the present invention provides a working medium supply pipe through which water flows, an expander that depressurizes water from the working medium supply pipe, and a heat source supply through which an external heat medium flows. A pipe, an evaporator for evaporating water from the expander with a heat medium of the heat source supply pipe, a steam supply pipe through which water vapor from the evaporator flows, and a vacuum pump for reducing the pressure in the steam supply pipe A heating device that heats the steam supply pipe so that the temperature of the steam supply pipe reaches a temperature equal to or higher than a saturation temperature of water in the steam supply pipe; and the steam supply that exceeds a saturation temperature of water in the steam supply pipe A compressor that is started after the pipe is heated and compresses the water vapor from the steam supply pipe; and a heat medium supply pipe that supplies the water vapor compressed by the compressor as a heat medium to a heat utilization facility. To do.

  (15) In order to achieve the above object, according to the present invention, the working medium is depressurized, the decompressed working medium is evaporated with a heat medium from the outside, and the evaporated working medium is compressed via a steam supply pipe. An operation method of a heat pump system that is introduced into a machine and supplies a working medium compressed by the compressor to a heat utilization facility as a heat medium, wherein the steam supply pipe is set to a temperature equal to or higher than a saturation temperature of the working medium in the steam supply pipe. It is assumed that the compressor is started after heating.

  (16) In order to achieve the above object, the present invention reduces the pressure of the working medium, evaporates the decompressed working medium with an external heat medium, and compresses the evaporated working medium through the steam supply pipe. An operation method of a heat pump system that introduces a working medium that is introduced into a compressor and compresses the working medium into a heat utilization facility as a heat medium, the procedure of stopping the compressor, and the working medium in the steam supply pipe A procedure for heating the steam supply pipe above the saturation temperature, and after the compressor is stopped, the steam supply pipe is maintained while maintaining the temperature of the steam supply pipe above the saturation temperature of the working medium in the steam supply pipe. And a procedure for discharging the working medium to the outside.

  According to the present invention, since the working medium that has become droplets is prevented from being introduced into the compressor, damage to the compressor can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a heat pump system according to an embodiment of the present invention.
The heat pump system shown in this figure includes a water tank 1, working medium supply pipes 2a and 2b, an expander 3, a heat source supply pipe 4, an evaporator 5, a steam supply pipe 6, a heating device 7, and a vacuum. A pump 8, a compressor 9, a temperature detector 10, a pressure detector 11, a control device 12, a working medium exhaust pipe 13, and a heat medium supply pipe 14 are provided.

  The water tank 1 is a tank in which water that is a working medium of the heat pump system of the present embodiment is stored in a liquid state. When water is used as the working medium as in the present embodiment, it is preferable to use pure water with less dissolved oxygen from the viewpoint of protecting equipment and piping in the heat pump system from acid corrosion, erosion, and the like. .

  The expander 3 decompresses the working medium (water) introduced from the water tank 1 through the working medium supply pipe 2a, and is connected to the water tank 1 through the working medium supply pipe 2a. When the working medium is depressurized by the expander 3, the saturation temperature of the working medium is reduced. Therefore, a medium having a temperature lower than the saturation temperature of the working medium at normal temperature can be used as a heat medium for evaporating the working medium. Water from the water tank 1 circulates in the liquid state in the working medium supply pipe 2a.

  The heat source supply pipe 4 circulates an external heat medium (fluid) used to heat the working medium (water), and is connected to the heat source 15 that is the heat medium supply source on the upstream side. . An example of the heat source 15 is a factory, and an example of the heat medium supplied from the factory via the heat source supply pipe 4 is hot waste water. The temperature of the heat medium from the heat source 15 is equal to or higher than the saturation temperature of the working medium decompressed by the expander 3 in order to evaporate the working medium. Water, which is a working medium in the present embodiment, is depressurized from normal pressure to 0.02 MPa (set pressure (Pset)) during operation of the heat pump system, and its saturation temperature is about 60 ° C. (set). (Saturation temperature (Tset)). In the present embodiment, a heat medium having a temperature equal to or higher than the preset saturation temperature (60 ° C.) is about 80 ° C. when leaving the heat source 15.

  The heat source supply pipe 4 includes a pipe connection part 21, an evaporator system switching valve 22, and a pipe connection part 23 in order from the heat source 15 toward the downstream side. The heat source supply pipe 4 is led to the inside of the evaporator 5 on the downstream side of the pipe connection portion 23, and after passing through the evaporator 5, for example, is connected to equipment (drainage equipment, exhaust equipment) that exhausts the heat medium. ing.

  The pipe connection part 21 is a part to which the upstream end of the heating apparatus pipe 24a is connected. The heating device system pipe 24a supplies a heat medium to a heating device 7 (which will be described in detail later) that heats the steam supply pipe 6, and is connected to the heating device 7 at the downstream end. The heating device system piping 24a is provided with a heating device system switching valve 25. The switching valve 25 selects whether or not to introduce a heat medium into the heating device 7. When the switching valve 25 is opened, the heat medium is introduced into the heating device 7. On the other hand, the pipe connection part 23 is a part to which the downstream end of the heating device system pipe 24b is connected. The heating device piping 24b is a channel through which the heat medium discharged from the heating device 7 flows, and is connected to the heating device 7 at the upstream end.

  The evaporator system switching valve 22 switches the flow path of the heat medium from the heat source 15, and is attached to the heat source supply pipe 4 so as to be located between the pipe connection part 21 and the pipe connection part 23. When the switching valve 22 is opened, the heat medium is guided directly toward the evaporator 5, and when the switching valve 22 is closed, the heat medium is guided toward the heating device 7.

  The evaporator 5 evaporates water from the expander 3 with the heat medium in the heat source supply pipe 4, and is connected to the expander 3 through the working medium supply pipe 2b. The water decompressed by the expander 3 flows through the working medium supply pipe 2b. As described above, the heat source supply pipe 4 passes through the evaporator 5, and the evaporator 5 is configured to exchange heat between the heat medium flowing through the heat source supply pipe 4 and the water from the expander 3. Steam is generated.

  The steam supply pipe 6 circulates the working medium (water vapor) from the evaporator 5, and is connected to the evaporator 5 on the upstream side and the compressor 9 on the downstream side. As shown in FIG. 2, the steam supply pipe 6 has an evaporator side flange 31 and a compressor side flange 32. The evaporator-side flange 31 is a joint provided at the upstream end of the steam supply pipe 6 and is connected to a flange (not shown) provided at the steam outlet of the evaporator 5. On the other hand, the compressor side flange 32 is a joint portion provided at the downstream end of the steam supply pipe 6 and is connected to a flange (not shown) provided at the steam inlet of the compressor 1. Note that these flanges 31 and 32 are connected to the flanges of the evaporator 5 or the compressor 9 through a thermal elongation absorbing member (for example, a flexible tube) in consideration of a difference in thermal elongation between the members. It is preferable.

FIG. 2 is a sectional view of the vicinity of the steam supply pipe 6 in the heat pump system of the present embodiment.
As shown in this figure, the heat pump system of the present embodiment includes a heating device 7, a temperature detector 10, a pressure detector 11, and a working medium exhaust pipe 13 in the vicinity of the steam supply pipe 6.

  The heating device 7 heats the steam supply pipe 6 so as to reach a temperature equal to or higher than the saturation temperature of the working medium in the steam supply pipe 6, and includes a pipe part 35, pipe connection parts 36a and 36b, and support plate parts 37a and 37b. It has.

  The pipe part 35 is a pipe through which the heat medium from the heating device system pipe 24 a flows, and is provided so as to cover the steam supply pipe 6 from the outer peripheral side of the steam supply pipe 6. That is, a double pipe structure is formed by the pipe part 35 and the steam supply pipe 6, and the heating device 7 heats the steam supply pipe 6 by the pipe part 35.

  The pipe part 35 is provided with pipe connection parts 36a and 36b. The pipe connection part 36a is an inlet for the heat medium to which the heating device system pipe 24a is connected, and the pipe connection part 36b is an outlet for the heat medium to which the heating device system pipe 24b is connected. In the present embodiment, the pipe connection part 36a is provided on the compressor 9 side, and the pipe connection part 36b from which the heat medium is discharged is provided on the evaporator 5 side. When the pipe connecting portions 36a and 36b are provided in this way, the heat medium flows in the pipe portion 35 from the compressor 9 side to the evaporator 5 side, so that the temperature of the steam supply pipe 6 is increased from the evaporator 5 side to the compressor. 9 side is higher.

  The support plate portion 37a is a plate member that closes the opening portion of the tube portion 35 on the compressor 9 side, and is fixed to the compressor 9 side of the tube portion 35 by welding or the like. The support plate portion 37b is a plate member that closes the opening portion on the evaporator 5 side of the tube portion 35, and is fixed to the evaporator 5 side of the tube portion 35 by welding or the like.

  The temperature detector 10 detects the temperature (metal temperature) of the steam supply pipe 6 and is attached to the steam supply pipe 6. As the temperature detector 10, for example, a sheath thermocouple in which a thermocouple wire is inserted inside a metal protective tube (sheath) and a powdered inorganic insulator is filled around the thermocouple wire may be used. In this embodiment, a sheath thermocouple is used as the temperature detector 10. The sheath thermocouple which is the temperature detector 10 is attached to the seat 38 provided between the support plate portion 37b and the evaporator side flange 31 so that the sheath tip detects the metal temperature of the steam supply pipe 9. It has been. The metal temperature (Tm) detected by the temperature detector 10 is converted into a digital signal (Td) via the A / D converter 61 (see FIG. 3 later), and is output to the control device 12.

  In addition, it is preferable to attach the temperature detector 10 in the location located in the downstream of the distribution direction of the heat carrier in the pipe part 35 with respect to the steam supply piping 6. When the temperature detector 10 is attached in this way, the temperature of the steam supply pipe 6 can be monitored based on a portion where the temperature is lower than the upstream side of the flow of the heat medium. It is because it can suppress that the droplet of a working medium adheres. Therefore, the temperature detector 10 in the present embodiment has the support plate portion 37b and the evaporator-side flange 31 so as to be positioned in the pipe portion 35 on the downstream side of the heat medium flowing from the compressor 9 side to the evaporator 5 side. It is attached between.

  The pressure detector 11 detects the pressure in the steam supply pipe 6 and is attached to the steam supply pipe 6. The pressure detector 11 of the present embodiment guides the internal pressure of the steam supply pipe 6 to the pressure transmitter 62 (see FIG. 3 later) through the static pressure hole 39 provided in the steam supply pipe 6. The pressure transmitter 62 detects the internal pressure of the steam supply pipe 6. The static pressure hole 39 is provided at a position different from the temperature detector 10 in the circumferential direction of the steam supply pipe 6, and the pressure transmitter 62 is connected to the static pressure hole 39 via a pressure guiding pipe (not shown). . The static pressure hole 39 in the present embodiment is provided at a position 180 degrees out of phase with the position of the seat 38 in the circumferential direction of the steam supply pipe 6. The internal pressure (P) detected by the pressure detector 11 is converted to a digital signal (Pd) via the A / D converter 61 and output to the control device 12, similarly to the temperature detector 10. Thus, the signal (Pd) output from the pressure detector 11 to the control device 12 is used for obtaining the saturation temperature (Ts) of the working medium in the steam supply pipe 6 in the control device 12. In the present embodiment, as shown in FIG. 3, the temperature detector 10 and the pressure detector 11 share the A / D converter 61. However, an individual A / D converter is provided for each. Of course, the detected value may be digitally converted.

  The working medium exhaust pipe 13 is a pipe that discharges the working fluid in the steam supply pipe 6 to the outside, and is connected to the steam supply pipe 6. The working medium exhaust pipe 13 in the present embodiment is connected to the steam supply pipe 6 via an intake port 41 provided between the compressor side flange 32 and the support plate portion 37a. The end of the working medium exhaust pipe 13 opposite to the intake port 41 is open to the atmosphere, for example, and the working medium sucked from the intake port 41 is discharged to the outside.

  Returning to FIG. 1, the working medium exhaust pipe 13 is provided with a vacuum pump 8 and an on-off valve 45.

  The vacuum pump 8 reduces the pressure in the steam supply pipe 6 to a set pressure (Pset), and is disposed in the working medium exhaust pipe 13 so as to be positioned downstream of the on-off valve 45 in the working medium flow direction. It is attached.

  The on-off valve 45 is for opening and closing the flow path of the working medium exhaust pipe 13 and is attached to the working medium exhaust pipe 13 so as to be positioned between the intake port 41 and the vacuum pump 8. When the on-off valve 45 is opened, the working medium in the working medium exhaust pipe 13 can flow outward, and when the on-off valve 45 is closed, the working medium in the working medium exhaust pipe 13 is blocked.

  The compressor (turbo compressor) 9 compresses the working medium from the steam supply pipe 6 and is connected to the steam supply pipe 6. A rotor 51 that rotationally drives the compressor 9 is connected to the compressor 9, and a heat medium supply pipe 14 is connected to an outlet of the compressor 9. The compressor 9 compresses the working medium by rotating an impeller (not shown) that is a rotating body provided in a casing (not shown) that is a stationary body. Although not particularly illustrated, the compressor 9 has a plurality of stages in order to increase the pressure of the heat medium (working medium) that is negative when leaving the steam supply pipe 6 to a positive pressure and supply it to the heat utilization facility. It is preferable to comprise.

  The rotor 51 is supported by bearings 52 and 53 and is connected to an electric motor 58 via a coupling 57. When the electric motor 58 is energized, the driving force of the electric motor 58 is transmitted to the compressor 9 via the coupling 57 and the rotor 51, and the compressor 9 is started. On the contrary, when the energization to the electric motor 58 is stopped, the compressor 9 is stopped.

  The bearings 52 and 53 are connected to a lubricating oil device 55 via a lubricating oil supply pipe 54 to which lubricating oil is supplied, and are connected to the lubricating oil device 55 via a lubricating oil discharge pipe 56 from which the lubricating oil is discharged. Has been. Lubricating oil is supplied to the bearings 52 and 53 from the lubricating oil device 55 via the lubricating oil supply pipe 54, and the drained oil supplied to the bearings 52 and 53 is lubricated via the lubricating oil discharge pipe 56. Returned to device 55.

  The heat medium supply pipe 14 supplies the working medium (water vapor) compressed by the compressor 9 to the heat utilization facility as a heat medium, and is connected to the heat utilization facility (not shown). The working medium sent via the heat medium supply pipe 14 is used as a heat medium in the heat utilization facility.

  Although not particularly illustrated, all the pipes described above (for example, the working medium supply pipes 2a and 2b, the heat source supply pipe 4, the steam supply pipe 6, the heat medium supply pipe 14 and the like (the one constituting the heating device 7 are also included). Including)) is preferably covered with a heat insulating material to keep the fluid in each pipe warm and to improve the efficiency.

  The control device 12 determines the magnitude of the temperature of the steam supply pipe 6 and the set value based on the input signals (Td, Pd) from the temperature detector 10 and the pressure detector 11, and operates the operation signal based on the determination result. Is output.

  FIG. 3 is a functional block diagram of the control device in the heat pump system of the present embodiment.

  In this figure, the control device 12 includes a calculation unit 63 and a control unit 64.

  The calculation unit 63 calculates the saturation temperature (Ts) of the working medium in the steam supply pipe 6 based on the internal pressure (Pd) input from the pressure detector 11 and the metal temperature (Td) of the steam supply pipe 6. ) And the saturation temperature (Ts) of the working medium (Tc = Td−Ts). The metal temperature (Td) of the steam supply pipe 6 is input from the temperature detector 10 to the calculation unit 63, and the pressure (Pd) of the working medium in the steam supply pipe 6 is input from the pressure detector 11. In addition, the calculation unit 63 outputs the calculated temperature difference (Tc) to the control unit 64.

  Here, the control part 64 is demonstrated, referring the driving | operation procedure of the heat pump system of this Embodiment.

  Although details will be described later in the description of the operation, in the present embodiment, when operating the heat pump system, (1) a procedure for preheating the steam supply pipe 6 by setting the inside of the steam supply pipe 6 to atmospheric pressure, and (2) steam Three steps are sequentially performed: a procedure for heating the steam supply piping 6 by setting the inside of the supply piping 6 to a set pressure (Pset), and (3) a procedure for starting the compressor 9.

  Step (1) is a stage in which the steam supply pipe 6 is heated by the heating device 7 until the temperature of the steam supply pipe 6 reaches the preheating completion temperature or higher while the internal pressure (P) of the steam supply pipe 6 is kept at atmospheric pressure. is there. If the steam supply pipe 6 is preheated before starting the vacuum pump 8 in this way, the time for driving the vacuum pump 8 is reduced, so that energy efficiency can be improved. In step (2), the vacuum pump 8 is activated to set the internal pressure (P) in the steam supply pipe 6 to the set pressure (Pset), and the steam supply pipe 6 is heated until the temperature of the steam supply pipe 6 reaches the heating completion temperature or higher. Is a stage of heating with a heating device 7. If the steam supply pipe 6 is heated before starting the compressor 9 in this way, it is possible to suppress condensation when the working medium is introduced into the compressor 9 into droplets. Step (3) is a stage in which the compressor 9 is started and the heat pump system is operated while the internal pressure (P) in the steam supply pipe 6 is maintained at the set pressure (Pset).

  By the way, the transition from step (1) to (2) and from step (2) to (3) is performed after the previous step is completed, and the control unit 64 determines whether or not each step is completed. The The control unit 64 is a part that determines whether or not each step is completed by using the temperature difference (Tc) input from the calculation unit 63 and clearly indicates the completion of each step. Specifically, the control unit 64 determines whether or not the completion of step (1) is based on whether or not the temperature difference (Tc) has reached the preheating completion value (C1) or more, and the completion of step (2) is determined based on the temperature difference ( It is determined by whether or not Tc) has reached the heating completion value (C2) or more.

  The preheating completion value (C1) is a setting value used for determining whether or not the steam supply pipe 6 has reached the preheating completion temperature or higher in step (1). The preheating completion value (C1) is obtained by subtracting the saturation temperature of the working medium at normal pressure (atmospheric pressure) from the preheating completion temperature that is the target of preheating of the steam supply pipe 6. What is necessary is just to set suitably the temperature below the saturation temperature (setting saturation temperature (Tset)) in the internal pressure (setting pressure (Pset)) of the steam supply piping 6 during heat pump operation as the preheating completion temperature. In the present embodiment, considering that the set saturation temperature (Tset) of the working medium is set to 60 ° C., 55 ° C., which is 5 ° C. lower than this, is set as the preheating completion temperature. In this case, the preheating completion value (C1) is set to “−45 ° C.” by subtracting the water saturation temperature (100 ° C.) at atmospheric pressure from the preheating completion temperature (55 ° C.).

  In step (1), when the steam supply pipe 6 is heated by the heating device 7 and the controller 64 determines that the temperature difference (Tc) has reached the preheat completion value (C1) or more, the steam supply pipe 6 A signal indicating that the preheating has been completed (preheating completion signal) is output by the control unit 64. This preheating completion signal is an operation signal (first operation signal) for operating the notification device 65 (see FIG. 3) for notifying the operator of the heat pump system that the preheating of the steam supply pipe 6 has been completed. Examples of the notification device 65 include a display device that displays on the screen that preheating has been completed, and a notification lamp that lights and notifies that preheating has been completed.

  The operator who recognizes that the preheating of the steam supply pipe 6 has been completed by the notification device 65 ends the step (1) and performs the operation of starting the subsequent step (2). At this time, the setting value used for the determination of the temperature difference (Tc) is switched from the preheating completion value (C1) to the heating completion value (C2). Note that the switching of the set value may be performed manually or automatically.

  The heating completion value (C2) is a set value used for determining whether or not the steam supply pipe 6 has reached the heating completion temperature or higher in step (2). The heating completion value (C2) is obtained by subtracting the set saturation temperature (Tset) of the working medium from the heating completion temperature that is the target of heating of the steam supply pipe 6. As the heating completion temperature, a temperature equal to or higher than the set saturation temperature (Tset) may be set as appropriate so that the working medium is not condensed in the steam supply pipe 6. In the present embodiment, considering that the set saturation temperature (Tset) is set to 60 ° C., 60 ° C. equal to this is set as the heating completion temperature. In this case, the heating completion value (C2) is set to “0 ° C.” by subtracting the preset saturation temperature (60 ° C.) of water from the heating completion temperature (60 ° C.).

  In step (2), when the steam supply pipe 6 is heated by the heating device 7 and the controller 64 determines that the temperature difference (Tc) has reached the heating completion value (C2) or more, the steam supply pipe 6 The controller 64 outputs a signal (heating completion signal) indicating that the heating is completed. This heating completion signal is an operation signal (second operation signal) for operating the notification device 65 that notifies that the heating of the steam supply pipe 6 has been completed. In the present embodiment, the same notification device 65 is used to notify that preheating and heating are completed, but it is of course possible to use individual devices. The operator who recognizes that the heating of the steam supply pipe 6 has been completed by the notification device 65 ends the step (2) and performs the operation of starting the subsequent step (3).

  In the present embodiment, the step (1) of preheating the steam supply pipe 6 before starting the vacuum pump 8 to improve the energy efficiency has been described. However, this step (1) is omitted. However, it is of course possible to introduce the working medium into the compressor 9 without generating droplets.

  Next, the starting method of the heat pump system of this Embodiment is demonstrated, referring a figure.

  FIG. 4 is a flowchart of the starting method of the heat pump system according to the present embodiment.

  In the present embodiment configured as described above, in order to preheat the steam supply pipe 6 (step (1)), first, the on-off valve 45 and the evaporator system switching valve 22 are closed, and the heating device system switching valve is closed. 25 is opened (S401). Thereby, the heat medium of about 80 ° C. supplied from the heat source 15 is led from the heat source supply pipe 4 to the heating device 7 through the pipe connection portion 21 and the heating device system pipe 24a. The heat medium thus guided to the heating device 7 flows in the pipe portion 35 from the compressor 9 side toward the evaporator 5 side, and heats the steam supply pipe 6 while lowering its own temperature. The heat medium that has passed through the pipe line 35 is circulated again through the heat source supply pipe 4 through the pipe connection part 23 from the heating device system pipe 24 b and is introduced into the evaporator 5. The heat medium guided to the evaporator 5 is discharged to the discharge facility after preheating the evaporator 5.

  While the heating device 7 preheats the steam supply pipe 6, the control device 12 includes the metal temperature (Td) of the steam supply pipe 6 input from the temperature detector 10 and the internal pressure (Pd) input from the pressure detector 11. Based on the above, it is monitored whether or not “Tc = Td−Ts ≧ C1” is established, and it is determined whether or not the preheating of the steam supply pipe 6 has been completed (S402). At this time, the metal temperature (Td) increases with the passage of time by the heating device 7, but the saturation temperature (Ts) of the working medium obtained from the internal pressure (Pd) is normal (large) in the steam supply pipe 6. Since it is maintained at atmospheric pressure), it continues to indicate the saturation temperature of the working medium at normal pressure. In the present embodiment, since the preheating completion value (C1) is −45 ° C. and the saturation temperature (Ts) of the working medium (water) at normal pressure is 100 ° C., the steam supply pipe 6 is heated, so that “Tc = When “Td−100 ° C. ≧ C1 = −45 ° C.”, that is, “Td ≧ 55 ° C.” is satisfied, the steam supply pipe 6 reaches the preheating completion temperature, and a preheating completion signal is output (S403).

  When the preheating completion signal is output, the operator of the heat pump system recognizes through the notification device 65 that the preheating of the steam supply pipe 6 has been completed. The operator who has recognized this activates the vacuum pump 8 and opens the on-off valve 45 in order to heat the steam supply pipe 6 by setting the internal pressure to the set pressure (Pset) (step (2)). 12 switches the setting value used for the determination of the temperature difference (Tc) from the preheating completion value (C1) to the heating completion value (C2). (S404). When the vacuum pump 8 is started and the on-off valve 45 is opened, the fluid in the steam supply pipe 6 is discharged through the working medium exhaust pipe 13, and the internal pressure of the steam supply pipe 6 is a set pressure (Pset). Reduced to 02 MPa. On the other hand, since the heat medium is continuously introduced into the heating device 7, the steam supply pipe 6 is further heated from the preheating completion temperature.

  The control device 12 monitors whether or not “Tc ≧ C2” is established while the heating device 7 heats the steam supply pipe 6, and determines whether or not the heating of the steam supply pipe 6 is completed (S405). ). In the present embodiment, since the heating completion value (C2) is 0 ° C. and the set saturation temperature (Tset) of water at the set pressure (0.02 MPa) is about 60 ° C., the steam supply pipe 6 is heated. When “Tc = Td−Tset ≧ C2 = 0 ° C.”, that is, “Td ≧ Tset (60 ° C.)” is satisfied, the steam supply pipe 6 reaches the heating completion temperature and a heating completion signal is output (S406).

  When the heating completion signal is output, the operator recognizes through the notification device 65 that the heating of the steam supply pipe 6 has been completed. In order to start the operation of the heat pump system (step (3)), the operator who has recognized this first closes the on-off valve 45 and stops the vacuum pump 8 to set the internal pressure of the steam supply pipe 6 to the set pressure ( Pset) (S407). Then, the electric motor 58 is energized to start the compressor 9, the heating device switching valve 25 is closed, and the evaporator switching valve 22 is opened (S408). As a result, the water from the water tank 1 is depressurized by the expander 3 and then heated by the heat medium directly introduced from the heat source 15 through the heat source supply pipe 4 in the evaporator 5 to be supplied as steam as steam. It is introduced into the pipe 6. The steam introduced into the steam supply pipe 6 is guided to the compressor 9 as a gas without being condensed because the steam supply pipe 6 is heated to a temperature equal to or higher than the set saturation temperature (Tset) of the steam. The water vapor introduced into the compressor 9 is pressurized to a predetermined pressure and then supplied to the heat utilization facility via the heat medium supply pipe 14.

  In S408, in order to secure the amount of heat used in the evaporator 5, the heating device switching valve 25 is closed and the evaporator switching valve 22 is opened, and the heat medium is directly supplied from the heat source 15 to the evaporator 5. However, when the working medium can be evaporated even with the heating medium after heating the steam supply pipe 6 with the heating device 7, the heating device switching valve 25 is opened and the evaporator switching valve 22 is closed. Alternatively, the compressor 9 may be started to operate the heat pump system. In the above description, S408 is performed after S407, but these operations may be performed simultaneously.

  Further, although the operation of each device or valve is not particularly described in each of the above procedures, these operations may be performed manually by the operator, or an operation signal is output from the control unit 64 to each device. It may be done automatically.

  Next, a method for stopping the heat pump system of the present embodiment will be described with reference to the drawings.

  FIG. 5 is a flowchart of the stopping method of the heat pump system of the present embodiment.

  Here, as a premise, when operating the above heat pump system, the compressor 9 is operating, the evaporator system switching valve 22 is open, the heating device system switching valve 25 and the on-off valve 45 are closed. It is assumed that the vacuum pump 8 is stopped. To stop the heat pump system from this state, first, the operator stops the electric motor 58 and stops the compressor 9 (S501). Thereby, the supply of water from the water tank 1 is stopped, and the circulation of the working medium in the heat pump system is stopped. When the circulation of the working medium is thus stopped, the temperature of the steam supply pipe 6 tends to gradually decrease from the set saturation temperature (Tset) of the working medium.

  Next, the operator closes the evaporator system switching valve 22, opens the heating device system switching valve 25, and introduces the heat medium from the heat source 15 into the heating device 7 through the heating device system piping 24a (S502). When the heat medium is introduced into the heating device 7 in this way, the steam supply pipe 6 is heated by the heat medium from the heat source 15, and the temperature of the steam supply pipe 6 is maintained at or above the saturation temperature of the working medium in the steam supply pipe 6. The Thereby, even if the supply of the working medium and the compressor 9 are stopped, the working medium in the steam supply pipe 6 can be held in a gaseous state.

  Subsequently, the operator activates the vacuum pump 8 and opens the on-off valve 45 to discharge the gaseous working medium remaining in the steam supply pipe 6 to the outside through the working medium discharge pipe 13 (S503). When the discharge of the working medium is completed, the entire system of the heat pump is stopped (S504). If the working medium held in the gas state is discharged from the steam supply pipe 6 in this way, it is possible to suppress the working medium from remaining as droplets in the steam supply pipe 6.

  In addition, in order to reliably discharge the working medium in the steam supply pipe 6 in a gas state, the temperature (Td) of the steam supply pipe 6 is operated in the steam supply pipe 6 using the control device 12 in S503. It is preferable to monitor that the temperature is kept above the saturation temperature of the medium. Specifically, for example, when discharging the working medium (S503), it is preferable to work while confirming with the notification device 65 that “Tc ≧ C2” is satisfied. If the heating completion signal continues to be output during the discharging operation in this manner, the working medium can be reliably discharged by the vacuum pump 8. Conversely, if the heating completion signal is interrupted during the discharge operation, water droplets may remain inside the pipe, so that it is necessary to separately check and remove the liquid droplets in the pipe. . If the temperature of the steam supply pipe 6 is monitored by the control device 12 in this way, it is possible to avoid residual liquid droplets even when there is an abnormality in the pipe system, so that the reliability of the system can be improved. .

  In the above description, the procedure (S502) for introducing the heat medium to the heating device 7 is performed after the procedure (S501) for stopping the compressor 9. However, the order may be reversed or may be performed simultaneously.

  Next, the effect of this embodiment will be described with reference to a comparative example.

  First, as a comparative example of the present embodiment, in the heat pump system described in Patent Document 1 and the like, the working medium itself heated by an external heat source is supplied to the heat utilization facility as a heat medium. Pay attention. Since the steam supply pipe of this type of heat pump is left in the atmosphere before starting the compressor, it is held at a temperature lower than the saturation temperature of the working medium (normal temperature). For this reason, when the compressor is started to start the heat pump, some of the working medium that goes to the compressor via the steam supply pipe may be cooled to the wall surface of the steam supply pipe and become droplets. When the droplets generated in this way are introduced into the compressor, they may collide with the impeller and damage the compressor. Further, when the impeller is damaged, the rotor system may be unbalanced and abnormal vibration may occur. Therefore, in this type of heat pump, it is necessary to provide a special drainage facility for discharging the droplets of the working medium generated inside the pipe to the outside in order to avoid the above-described problems.

  In contrast to such a comparative example, the heat pump system according to the present embodiment has a vacuum pump 8 that reduces the pressure in the steam supply pipe 6 and steam at a temperature equal to or higher than the saturation temperature (Tset) of the working medium in the steam supply pipe 6. A heating device 7 that heats the steam supply pipe 6 so that the temperature of the supply pipe 6 reaches, and a working medium that is activated after the steam supply pipe 6 is heated to a set saturation temperature (Tset) or higher and from the steam supply pipe 6 Is provided. In the heat pump system of the present embodiment configured as described above, the steam supply pipe 6 is first heated using the heating device 7 and compressed after the temperature of the steam supply pipe 6 reaches the set saturation temperature (Tset) or higher. When the machine 9 is activated to activate the heat pump system, the working medium can be introduced into the compressor 9 as a gas even when the temperature of the steam supply pipe 6 is lower than the saturation temperature of the working medium before heating. This prevents the working medium from being introduced into the compressor 9 as droplets when the heat pump system is activated, so that the compressor 9 can be prevented from being damaged. In addition, according to the present embodiment, it is not necessary to discharge condensed water with a special drainage facility, etc., so that the initial cost and running cost of the system can be reduced, and the work procedure required at the start of operation can be reduced. . As a result, the introduction and maintenance of the system can be facilitated, and the operability of the system can be improved.

  Furthermore, in the present embodiment, before the temperature of the steam supply pipe 6 reaches the set saturation temperature (Tset), the steam supply pipe 6 is first heated to the preheating completion temperature or higher by the heating device 7 and then the vacuum pump 8 is used. The pressure in the steam supply pipe 6 is reduced to the set pressure (Pset). If the steam supply pipe 6 is heated in advance before starting the vacuum pump 8 in this way, the vacuum pump 8 is operated as compared with the case where the vacuum pump 8 is started simultaneously with the heating of the steam supply pipe 6. Time can be shortened. Thereby, since the energy which the vacuum pump 8 drives can be reduced, the energy efficiency of a heat pump system can be improved.

  Further, the heat pump system according to the present embodiment indicates that the temperature of the steam supply pipe 6 has reached the preheating completion temperature or the heating completion temperature based on the detection values input from the temperature detector 10 and the pressure detector 11. Based on the control device 12 to be determined and the preheating completion signal or heating completion signal input from the control device 12, the operator is notified that the temperature of the steam supply pipe 6 has reached the preheating completion temperature or the heating completion temperature. A notification device 65 is provided. According to the present embodiment configured as described above, the operator can easily recognize via the notification device 65 that the temperature of the steam supply pipe 6 has reached the preheating completion temperature or the heating completion temperature. After confirming the completion of each procedure, the next procedure can be executed. As a result, the occurrence of an operation error such as executing the next procedure before completion of each procedure is suppressed, so that the reliability of the system can be improved.

  In the above example, the degree of heating of the steam supply pipe 6 is transmitted to the operator via the notification device 65 (S403, S406), and the operator himself operates the system based on this (S404, S407, S408). Although the configuration has been described, the control device 12 may be configured to automatically operate each device in accordance with the temperature of the steam supply pipe 6. As a configuration in this case, for example, when the control device 12 recognizes that the temperature of the steam supply pipe 6 has reached the preheating completion temperature, the vacuum pump 8 is operated instead of the preheating completion signal in the above example. And when the control device 12 recognizes that the heating completion temperature has been reached, instead of the above heating completion signal, There are some which output an operation signal for stopping the vacuum pump 8, an operation signal for closing the on-off valve 45, an operation signal for starting the compressor 9, and the like. According to the heat pump system configured as described above, since each device is operated by the control device 12 based on the degree of heating of the steam supply pipe 6, it is possible to automatically perform a procedure necessary for starting the heat pump. This eliminates the need for an operator to intervene in the middle of the work, and thus shortens the operation time and labor costs.

  Further, when the heat pump system is stopped using this configuration, when “Tc ≧ C2” is satisfied (that is, the temperature of the steam supply pipe 6 is the saturation temperature of the working medium in the steam supply pipe 6). The operation signal for opening the on-off valve 45 is output only when the vacuum pump 8 is operated, and when “Tc <C2” is established, the operation signal for stopping the vacuum pump 8 and closing the on-off valve 45 is issued. The control device 12 may be configured to output. In this way, the vacuum pump 8 can be operated only when the working medium is in a gaseous state. Therefore, when the working medium is discharged (S503), the notification device 65 confirms that “Tc ≧ C2” is satisfied. Thus, the working medium can be discharged to the outside more reliably than when working.

  By the way, in said comparative example, when a compressor is stopped in order to stop a heat pump system, a steam supply piping may be cooled to air | atmosphere and the temperature may reach the saturation temperature of a working medium. In this case, if the working medium remains in the steam supply pipe, the working medium may condense into droplets. The droplets generated in this manner can cause damage to the compressor when the compressor is restarted, similar to the droplets generated when the compressor is started.

  In contrast to the comparative example having such a problem, in the present embodiment, the working medium in the steam supply pipe 6 is heated by the heating device 7 between the time when the compressor 9 is stopped and the time when the entire system is stopped. The temperature of the steam supply pipe is maintained at a temperature equal to or higher than the saturation temperature, and the working medium held in a gaseous state by the vacuum pump 8 is discharged from the steam supply pipe 6. When the working medium is discharged from the steam supply pipe 6 in this way, the working medium in the steam supply pipe 6 can be reliably discharged, so that even if the steam supply pipe is cooled, droplets of the working medium are generated inside. Can be prevented. Therefore, according to the present embodiment, the working medium can be prevented from becoming droplets after the compressor 9 is stopped, so that damage to the compressor 9 can be suppressed.

  In the present embodiment, a heat medium is introduced from the heat source supply pipe 4 to the heating device 7 to heat the steam supply pipe 6, but the upstream end of the heating device system pipe 24 a is connected to the heat source 15. Then, the heat medium may be led directly to the heating device 7 or a heat source other than the heat source 15 and the heating device system pipe 24a may be connected to constitute a system independent of the evaporator 5.

  Further, the heating device 7 is not limited to the one in which the steam supply pipe 6 and the pipe portion 35 form a double pipe structure as described above. What was wound may be used. Further, the above heating device 7 heats the steam supply pipe 6 from the outer surface with a heat medium. It is also possible to use a method of supplying to the pipe and heating from the inside of the pipe. Of course, it is also possible to employ a method of heating electrically by wrapping a heating wire around the steam supply pipe 6.

  Furthermore, in the above, the case where water is used as the working medium of the heat pump system has been described. However, a working medium whose set saturation temperature (Tset) during heat pump operation is lower than the temperature of the steam supply pipe 6 left in a normal temperature environment is used. The present invention is applicable to any heat pump system utilized as a heat pump system.

The schematic block diagram of the heat pump system which is embodiment of this invention. Sectional drawing of heat pump system steam supply piping 6 vicinity which is embodiment of this invention. The functional block diagram of the control apparatus in the heat pump system of this Embodiment. The flowchart of the starting method of the heat pump system of this Embodiment. The flowchart of the stop method of the heat pump system of this Embodiment.

Explanation of symbols

2 Working medium supply piping 3 Expander 4 Heat source supply piping 5 Evaporator 6 Steam supply piping 7 Heating device 8 Vacuum pump 9 Compressor 10 Temperature detector 11 Pressure detector 12 Controller 14 Heating medium supply piping 24 Heating device system piping 35 Pipe 65 Notification device Pset Set pressure Tset Set saturation temperature

Claims (16)

A working medium supply pipe through which the working medium flows;
An expander for decompressing the working medium from the working medium supply pipe;
A heat source supply pipe through which an external heat medium flows;
An evaporator for evaporating the working medium from the expander with the heat medium of the heat source supply pipe;
A steam supply pipe through which the working medium from the evaporator flows;
A vacuum pump for reducing the pressure in the steam supply pipe;
A heating device that heats the steam supply pipe such that the temperature of the steam supply pipe reaches a temperature equal to or higher than a saturation temperature of the working medium in the steam supply pipe;
A compressor that is started after the steam supply pipe is heated to a temperature equal to or higher than a saturation temperature of the working medium in the steam supply pipe, and compresses the working medium from the steam supply pipe;
A heat pump system comprising: a heat medium supply pipe that supplies the working medium compressed by the compressor as a heat medium to a heat utilization facility. The heat pump system according to claim 1,
Between the time when the compressor is stopped and the time when the entire system is stopped,
The heating device maintains the temperature of the steam supply pipe above the saturation temperature of the working medium in the steam supply pipe,
The vacuum pump discharges the working medium in the steam supply pipe held in a gaseous state by the heating device to the outside. The heat pump system according to claim 1,
The vacuum pump reduces the pressure in the steam supply pipe after the temperature of the steam supply pipe reaches a preheating completion temperature set to be equal to or lower than a saturation temperature of a working medium in the steam supply pipe. Heat pump system. The heat pump system according to claim 1,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
When an operation signal is input, a notification device that notifies that the temperature of the steam supply pipe has reached or exceeded the saturation temperature of the working medium in the steam supply pipe;
A saturation temperature of the working medium in the steam supply pipe is calculated based on a detection value input from the pressure detection means, and the detection value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium. And a control device that outputs an operation signal to the notification device. The heat pump system according to claim 2,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
When an operation signal is input, a notification device that informs that the temperature of the steam supply pipe is maintained at or above the saturation temperature of the working medium in the steam supply pipe;
Between the time when the compressor is stopped and the time when the entire system is stopped, the saturation temperature of the working medium in the steam supply pipe is calculated based on the detection value input from the pressure detection means, and the temperature detection is performed. A heat pump system comprising: a control device that outputs an operation signal to the notification device when a detected value input from the means is maintained at a temperature equal to or higher than the calculated saturation temperature of the working medium. The heat pump system according to claim 3,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
When the first operation signal is inputted, it is notified that the temperature of the steam supply pipe has reached the preheating completion temperature or more, and when the second operation signal is inputted, the temperature of the steam supply pipe is changed within the steam supply pipe. A notification device for notifying that the saturation temperature of the working medium has been reached;
When the detection value input from the temperature detection means reaches the preheating completion temperature or more, a first operation signal is output to the notification device, and after the first operation signal is output, the pressure detection means A saturation temperature of the working medium in the steam supply pipe is calculated based on the input detection value, and the notification is made when the detection value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium. A heat pump system comprising: a control device that outputs a second operation signal to the device. The heat pump system according to claim 1,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
A saturation temperature of the working medium in the steam supply pipe is calculated based on a detection value input from the pressure detection means, and the detection value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium. And a control device that starts the compressor when the heat pump system is activated. The heat pump system according to claim 2,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
Between the time when the compressor is stopped and the time when the entire system is stopped, the saturation temperature of the working medium in the steam supply pipe is calculated based on the detection value input from the pressure detection means, and the temperature detection is performed. And a control device that operates the vacuum pump when a detected value input from the means is maintained at a temperature equal to or higher than the calculated saturation temperature of the working medium. The heat pump system according to claim 3,
Temperature detecting means for detecting the temperature of the steam supply pipe;
Pressure detecting means for detecting the pressure in the steam supply pipe;
The vacuum pump is activated when a detection value input from the temperature detection means reaches or exceeds the preheating completion temperature, and based on the detection value input from the pressure detection means after the vacuum pump is activated. A control device that calculates a saturation temperature of the working medium in the steam supply pipe and activates the compressor when a detection value input from the temperature detection means reaches or exceeds the calculated saturation temperature of the working medium; A heat pump system comprising: The heat pump system according to claim 1,
The heating apparatus is a pipe through which a heat medium from the outside flows, and has a pipe part provided so as to cover the steam supply pipe from the outer peripheral side. The heat pump system according to claim 4, wherein
The heating device is a pipe through which a heat medium from the outside flows, and has a pipe part provided so as to cover the steam supply pipe from the outer peripheral side,
The temperature detection means is attached to a portion of the steam supply pipe located on the downstream side in the flow direction of the heat medium in the pipe part. The heat pump system according to claim 10 or 11,
The pipe part is a pipe branched from the heat source supply pipe on the upstream side of the evaporator, and is a pipe connected again to the heat source supply pipe after passing through the outer peripheral side of the steam supply pipe. Heat pump system. A working medium supply pipe through which the working medium flows;
An expander for decompressing the working medium from the working medium supply pipe;
A heat source supply pipe through which an external heat medium flows;
An evaporator for evaporating the working medium from the expander with the heat medium of the heat source supply pipe;
A steam supply pipe through which the working medium from the evaporator flows;
A compressor for compressing the working medium from the steam supply pipe;
A heat medium supply pipe for supplying the working medium compressed by the compressor as a heat medium to a heat utilization facility;
A heating device that holds the temperature of the steam supply pipe above the saturation temperature of the working medium in the steam supply pipe between the time when the compressor is stopped and the time when the entire system is stopped;
A heat pump system comprising: a vacuum pump that discharges the working medium in the steam supply pipe held in a gaseous state by the heating device to the outside. A working medium supply pipe through which water flows;
An expander for depressurizing water from the working medium supply pipe;
A heat source supply pipe through which an external heat medium flows;
An evaporator for evaporating water from the expander with a heat medium of the heat source supply pipe;
A steam supply pipe through which water vapor from the evaporator flows,
A vacuum pump for reducing the pressure in the steam supply pipe;
A heating device that heats the steam supply pipe so that the temperature of the steam supply pipe reaches a temperature equal to or higher than a saturation temperature of water in the steam supply pipe;
A compressor that is started after the steam supply pipe is heated to a temperature equal to or higher than a saturation temperature of water in the steam supply pipe, and compresses water vapor from the steam supply pipe;
A heat pump system comprising: a heat medium supply pipe for supplying water vapor compressed by the compressor as a heat medium to a heat utilization facility. The working medium is depressurized, the depressurized working medium is evaporated with an external heat medium, the evaporated working medium is introduced into the compressor through a steam supply pipe, and the working medium compressed by the compressor is heated. An operation method of a heat pump system that supplies heat utilization equipment as a medium,
An operation method of a heat pump system, wherein the compressor is started after the steam supply pipe is heated to a temperature equal to or higher than a saturation temperature of a working medium in the steam supply pipe. The working medium is depressurized, the depressurized working medium is evaporated with an external heat medium, the evaporated working medium is introduced into the compressor through a steam supply pipe, and the working medium compressed by the compressor is heated. An operation method of a heat pump system that supplies heat utilization equipment as a medium,
A procedure for stopping the compressor;
A procedure for heating the steam supply pipe above the saturation temperature of the working medium in the steam supply pipe;
And a procedure for discharging the working medium in the steam supply pipe to the outside while maintaining the temperature of the steam supply pipe at or above the saturation temperature of the working medium in the steam supply pipe after the compressor is stopped. A method of operating a heat pump system characterized by

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