JP2007046851A - Heat pump water heater bathroom heating dryer - Google Patents

Abstract

【Task】
In a heat pump hot water bath heating / drying device that has a bathroom heating / drying function, a direct hot water supply type is being studied to reduce the size and weight, but there is a large difference in the required heating capacity during hot water operation and bathroom heating / drying operation. The compressor rotation speed control of this type cannot cope with the problem, and particularly in the low-speed operation at the time of bathroom heating / drying operation, the separation or step-out of the compression mechanism part, the generation of noise, etc. are problems.
[Solution]
The present invention adds a bathroom heating / drying function to a direct hot water type heat pump water heater that performs heat pump operation when hot water is used and directly supplies heated water to a terminal for use, and as a control method of the compressor, the rotational speed control and capacity The present invention provides a heat pump hot-water supply bathroom heating / drying device that solves the conventional problems by skillfully using control.

[Selection] Figure 4

Description

  The present invention relates to a heat pump hot water bath heating / drying apparatus, and in particular, by expanding the variable capacity range of the compressor, it can cope with a high operating efficiency from a hot water supply operation requiring a large capacity to a bathroom heating / drying operation requiring a small capacity. A heat pump hot water supply bathroom heating and drying apparatus is provided.

In recent years, with the widespread use of heat pump water heaters, those having a floor heating function have been proposed.
An example of such a heat pump water heater is disclosed in Japanese Patent Application Laid-Open No. 2003-247753 (Patent Document 1).
This is done by operating the heat pump at night when the electricity rate is low, boiling water and storing it in a hot water storage tank, using hot water in the hot water storage tank as needed, using hot water from the faucet, or circulating the hot water to floor heating It was something to do.
In general, while the hot water storage temperature is 60 to 90 ° C., the use temperature of the faucet hot water is about 40 ° C., and the use temperature of the circulating hot water at the time of floor heating is about 55 to 60 ° C. In either case, the operating temperature was lower than the hot water storage temperature, and water was added when faucet hot water was supplied, and the temperature was adjusted by mixing return hot water from floor heating during floor heating.

Japanese Patent Laid-Open No. 2003-247753

In the heat pump water heater provided with the above conventional floor heating function and bathroom heating / drying function, a large capacity hot water storage tank of 400L to 600L is required, and when the hot water is fully stored, it reaches 400kg to 600kg only by the amount of hot water, A heat pump unit and a hot water tank unit are provided separately, and there are various problems in installation work, such as installation area, installation strength, and water piping connection between the heat pump unit and the hot water tank unit must be made on site. .
Also, depending on the climate, visitors, etc., if the amount of hot water used per day is large, the hot water in the hot water storage tank may be used up, leading to problems such as inability to supply hot water to the bath.
In particular, the amount of hot water in the hot water storage tank tends to be insufficient because the amount of hot water used in the faucet, bath replenishment, floor heating, and bathroom heating / drying increases in winter. The hot water storage tank must be enlarged.
Furthermore, the provision of a bathroom heating / drying function increases the difference in the amount of hot water used due to the family composition, etc., and the amount of hot water storage tends to be insufficient for households that use the bathroom heating / drying function of heat pump water heaters. The hot water storage tank becomes larger than necessary for a household that uses the bathroom heating drying function of the heat pump water heater.
In addition, during winter hot water storage operation, water of about 10 ° C is heated to 60-90 ° C, so heating capacity of 50-80 ° C is required. Since it suffices to circulate and heat only the amount cooled during circulation, for example, in the case of bathroom heating and drying, hot water of 55 ° C to 60 ° C is sent to dry the bathroom and the return hot water temperature is about 45 to 50 ° C. Therefore, a heating capacity of about 10 ° C. is sufficient. For this reason, it is necessary to set the compressor to a high speed (for example, 7000 rpm) during the hot water supply operation in winter and to set the compressor to a low speed (for example, 1000 rpm) during the bathroom heating / drying operation. In addition, the compressor is designed for maximum capacity, so it can be used during hot water supply operation, but it is slow during bathroom heating / drying operation when the ambient temperature is high, which may cause problems such as separation of the scroll compression mechanism and step-out. This may cause problems such as an extreme decrease in performance and noise generation, and may reduce reliability.
That is, there is a large difference between the required heating capacity during hot water supply operation and the required heating capacity during bathroom heating / drying operation, which cannot be handled by the conventional compressor rotation speed control, and in the low-speed operation during bathroom heating / drying operation, the compression mechanism section There is a risk that the separation or step-out of the sound, the generation of noise, etc. may become a problem.
On the other hand, from the viewpoint of energy saving, heat pump operation has lower operating efficiency as the heating hot water temperature is higher when the feed water temperature is constant. Therefore, the heat pump operation is performed under a condition where the operation efficiency is low.
Furthermore, since a large amount of hot water is stored in the hot water storage tank, energy loss due to heat release is also a serious problem.
This invention makes it a subject to improve the reliability at the time of bathroom heating drying operation in the heat pump water heater provided with the bathroom heating drying function.

  As a means for solving the problem in the hot water storage type heat pump water heater having a bathroom heating and drying function, the present invention does not perform a prior heat pump operation at night, performs a heat pump operation when using hot water, and uses heated water directly. A heat pump water heater / heater / dryer that eliminates conventional problems by adding a bathroom heating / drying function to a direct hot water supply heat pump water heater that supplies hot water to the compressor, and effectively using rotation speed control and capacity control as compressor control methods. Is to provide.

The invention according to claim 1 is provided with a heat source circuit including a heat pump refrigerant circuit composed of a compressor, a refrigerant on-off valve, a heat exchanger for hot water supply, a heat exchanger for bathroom heating and drying, a decompressor, and an evaporator, and water is supplied. It has a hot water supply circuit that heats water and supplies hot water, and a bathroom heating and drying circuit that heats the circulating heat medium and supplies heat, and when supplying heat to the hot water supply circuit, the compressor is controlled in rotation speed, When supplying heat to the bathroom heating and drying circuit, it has an operation control means that controls the capacity of the compressor, so a large-capacity hot water storage tank is not required, so the product can be reduced in size and weight, and installation conditions Can be drastically improved, and it is possible to eliminate hot water shortage and reduce heat release from the hot water storage tank.
Moreover, since the heating hot-water temperature at the time of heat pump operation matches with each use hot-water supply temperature, operation efficiency can be improved by a part lower than the conventional hot water storage temperature.
Furthermore, since the compressor control is selectively used for the rotation speed control at high load and the capacity control at low load, the heating capacity variable range of the compressor is expanded, the separation of the compression mechanism at the low load low rotation speed, It eliminates the conventional problems such as performance degradation and noise caused by step-out, and can efficiently respond from winter hot water supply operation that requires a large capacity to bathroom heating and drying operation that requires a small capacity. Moreover, according to this invention, the reliability in a direct hot water supply type heat pump hot water supply bathroom heating drying apparatus can be improved, and size reduction and weight reduction can be implement | achieved.
Next, the invention according to claim 2 is the invention according to claim 1, in addition to claim 1, wherein the heat pump refrigerant circuit includes a capacity control valve between a refrigerant compression intermediate portion of the compressor and the evaporator and the compressor, Since the capacity control valve is closed when the rotation speed of the compressor is controlled and is opened when the capacity is controlled, in the conventional compressor structure, an intermediate discharge port is provided in the refrigerant compression intermediate portion, and the capacity control having an opening / closing function. Due to the simple structure of connecting the valves, the capacity of the compressor can be controlled, and the operation efficiency can be improved during the bathroom heating and drying operation which requires only a small capacity. Moreover, since the refrigerant compression load of the compressor is reduced by the capacity control, problems such as separation, step-out, and noise of the scroll mechanism due to low speed operation can be solved. Further, according to this configuration, it is possible to reduce compressor development costs and improve reliability without developing a new compressor incorporating a new capacity control mechanism.
Next, the invention according to claim 3 is the invention according to claim 1, in addition to claim 1, wherein the heat source circuit is constituted by a plurality of heat pump refrigerant circuits, a plurality of heat pump refrigerant circuits are operated during hot water supply, and a single heat pump refrigerant is used during bathroom heating drying. Since the circuit is operated, the range of the hot water supply capacity is further expanded, and the optimum operation can be performed from the winter hot water supply operation requiring a large capacity to the sufficient bathroom heating / drying operation with a small capacity.
Also, by using multiple heat pump refrigerant circuits for hot water supply that requires a large capacity, and using a single heat pump refrigerant circuit for bathroom heating and drying, which requires only a small capacity, it is possible to perform optimal operation according to the application and comfortably. Effects such as control and energy saving can be obtained.
Next, the invention according to claim 4 is the invention according to claim 4, in addition to claim 1, wherein the heat source circuit is constituted by two heat pump refrigerant circuits having and not having a capacity control function, and both heat pump refrigerant circuits are operated during hot water supply. However, since only the heat pump refrigerant circuit with capacity control is operated during bathroom heating and drying, and only the heat pump refrigerant circuit without capacity control is operated when reheating the bath, only one compressor for capacity control is used. As the cost is reduced, the two heat pump refrigerant circuits are effectively used according to the hot water supply load, improving usability, and the two heat pump refrigerant circuits are used separately for the bathroom heating / drying operation and the bath reheating operation, The operating time can be balanced and the life reliability can be improved.
Next, the invention according to claim 5 is the invention according to claim 1, in addition to claim 1, wherein when the hot water use and the bathroom heating / drying use or the bath reheating use are performed at the same time, the rotational speed giving priority to the hot water supply operation. For example, if the kitchen faucet is used for hot water washing and drying, the kitchen hot water is given priority, so there is no effect on the dishwashing, and the bathroom heating and drying capacity is maintained for several minutes. Although the temperature may decrease, the temperature difference between before and after bathroom heating and drying of the circulating heat medium is about 10 ° C., so there is little influence.
In addition, when hot water is supplied at the kitchen faucet during dishwashing and the dishes are washed, the bathing may be delayed, but it is possible to prevent the water from becoming cold when washing the dishes and to reduce the influence. In addition, when hot water is supplied from the kitchen faucet and dishwashing is performed during bath water supply, priority is given to kitchen hot water, and the boiling time of the bath may be increased by about 5 minutes, but it can be said that the influence is small.
In this way, when there is a shortage of heating capacity due to simultaneous use of hot water supply and bathroom heating / drying or bathing, the priority is given to kitchen hot water, minimizing the impact on others and improving usability. Can do.
Next, in addition to claim 1, the hot water supply circuit according to a sixth aspect of the present invention includes a tank hot water supply circuit for supplying hot water from a hot water storage tank to a use terminal, and hot water heated by a heat exchanger for hot water supply directly to the use terminal. Since it has a direct hot water supply circuit, it always keeps hot water in the hot water storage tank, and at the time of hot water supply, the shortage of heating power immediately after the start of the heat pump operation is compensated by the tank hot water supply. When the temperature reaches about 40 ° C., the hot water supply tank can be switched to direct hot water supply by stopping the hot water supply from the tank, so that the rise time at the time of hot water supply can be shortened.
Further, the heating operation efficiency can be improved by setting the boiling temperature after stabilization of the heat pump operation to the terminal use temperature (about 40 ° C.) lower than the tank hot water storage temperature (about 65 ° C.).

ADVANTAGE OF THE INVENTION According to this invention, the reliability at the time of bathroom heating drying can be improved.

A first embodiment of the present invention will be described below with reference to FIGS.

  In FIG. 1, the heat pump hot water supply bathroom heating / drying apparatus includes components of a heat source circuit 40, a hot water supply circuit 45, and a bathroom heating / drying circuit 50 including two heat pump refrigerant circuits of a bathroom heating / drying side refrigerant circuit 41 and a bath side refrigerant circuit 42. The bathroom heating / drying heat exchanger 8 and the operation control means 55 are provided.

  The heat source circuit 40, the hot water supply circuit 45, and the bathroom heating / drying heat exchanger 8 are integrally housed in the same box, and the operation control means 55 includes a kitchen remote controller 56 and a bath remote controller 57 provided separately. ing.

  The bathroom heating / drying devices 31 and 32, which are components of the bathroom heating / drying circuit 50, are provided separately from the heat pump hot water supply / bathroom heating / drying device, such as a bathroom heating / drying panel. And a bathroom heating / drying return fitting 30 connected to a heat pump hot water bath heating / drying apparatus.

  The heat source circuit 40 functions as a heating source for hot water supply, bathroom heating drying, and bath renewal, and employs a two-cycle heat pump system including a bathroom heating drying side refrigerant circuit 41 and a bath side refrigerant circuit 42. In the bathroom heating / drying side refrigerant circuit 41, the compressor 1a, the refrigerant on-off valve 2a, the refrigerant side heat transfer pipe 3a arranged in the hot water supply heat exchanger 3, the decompression device 4a, and the evaporator 5a are sequentially connected via a water pipe. A circuit, a compressor 1a, a refrigerant on-off valve 2b, a bathroom heating / drying refrigerant pipe 8a disposed in the bathroom heating / drying heat exchanger 8, a decompressor 4c, and an evaporator 5a sequentially connected through a water pipe The bath-side refrigerant circuit 42 is composed of a compressor 1b, a refrigerant on-off valve 2c, a refrigerant-side heat transfer tube 3b disposed in the hot water supply heat exchanger 3, a decompression device 4b, and an evaporator 5b sequentially through a water pipe. Consists of a connected circuit, and a circuit in which a compressor 1b, a refrigerant on-off valve 2d, a bath refrigerant pipe 7a disposed in the bath heat exchanger 7, a decompression device 4b, and an evaporator 5b are sequentially connected via a water pipe. Is done. The refrigerant is sealed in these circuits, and switching of the refrigerant flow path between the circuits is performed by opening and closing the refrigerant on-off valves 2a, 2b, 2c, and 2d.

  The compressors 1a and 1b are large-capacity compressors that can be adapted to a direct hot water supply type heat pump water heater, and that can change the rotational speed in accordance with the amount of hot water supply. That is, the compressors 1a and 1b are controlled at a rotational speed from a low speed (for example, 1000 rotations / minute) to a high speed (for example, 7000 rotations / minute) by PWM control, voltage control (for example, PAM control) and a combination control thereof. It has become.

Further, a capacity control valve 6 is provided between the refrigerant compression intermediate part of the compressor 1a of the bathroom heating / drying side refrigerant circuit 41 and between the evaporator 5a and the compressor 1a, and the capacity control valve 6 is closed during hot water supply operation. During the heating and drying operation, it is opened and the intermediate refrigerant of the compressor 1a is returned to adjust the refrigerant circulation amount, thereby performing the capacity control operation for reducing the refrigerant compression load.
That is, in the case of kitchen hot water supply and bath hot water supply, both the bathroom heating / drying side refrigerant circuit 41 and the bath side refrigerant circuit 42 perform the rotational speed control operation. In the case of bathroom heating / drying, the bathroom heating / drying side refrigerant circuit 41 performs capacity control operation, and the bath side refrigerant circuit 42 is stopped. In the case of bathing, the bathroom heating / drying side refrigerant circuit 41 is stopped, and the bath side refrigerant circuit 42 is controlled to perform the rotation speed control operation.
It should be noted that the rotational speed control during hot water supply is set to a high speed of about 7000 rpm per minute in the winter season when a large capacity is required, and is set to a medium speed of 3000 rpm per minute in the summer season when the high capacity is not required.
On the other hand, in order to support bathroom heating / drying operation with a small amount of heat by rotation speed control, it may be necessary to use one cycle and operate at a low speed of about 1000 rotations / min. There is a risk of stepping out, noise, etc. Therefore, in the present invention, during bathroom heating / drying that requires low-speed operation, only the bathroom heating / drying side refrigerant circuit 41 is capacity-controlled.

  The hot water supply heat exchanger 3 includes refrigerant side heat transfer tubes 3a and 3b and water supply side heat transfer tubes 3c and 3d, and performs heat exchange between the refrigerant side heat transfer tubes 3a and 3b and the water supply side heat transfer tubes 3c and 3d. Configured to do.

  As the decompression devices 4a, 4b, 4c, capillary tubes, temperature type expansion valves, electric expansion valves, etc. are generally used, and a hot water supply heat exchanger 3, a bath heat exchanger 7, a bathroom heating drying heat exchanger. The medium-temperature high-pressure refrigerant sent through 8 is depressurized and sent to the evaporators 5a and 5b as a low-pressure refrigerant that easily evaporates. In the case of a heat pump water heater, the decompression devices 4a, 4b and 4c function to adjust the refrigerant circulation amount in the heat pump circuit by changing the throttle amount of the refrigerant passage in accordance with the heating capacity, or by opening the throttle amount to the medium temperature refrigerant. An electric expansion valve is suitable because it also serves as a defrosting device that sends a large amount of water to the evaporators 5a and 5b to melt frost.

  The evaporators 5a and 5b are air refrigerant heat exchangers for exchanging heat between air and the refrigerant.

  Next, the heat pump operation at the time of hot water supply, heating, and bath renewal operation will be described.

  During the hot water supply operation, both the bathroom heating / drying side refrigerant circuit 41 and the bath side refrigerant circuit 42 are operated, and the high-temperature and high-pressure refrigerant compressed by the compressors 1a and 1b passes through the refrigerant on-off valve 2a and the refrigerant on-off valve 2c on the refrigerant side. The refrigerant flowing into the heat transfer tubes 3a and 3b and flowing through the water supply side heat transfer tubes 3c and 3d is heated, and the refrigerant that has become low pressure and low temperature through the decompression devices 4a and 4b and the evaporators 5a and 5b becomes the compressors 1a and 1b. Return to. By repeating this refrigerant circulation, the feed water can be continuously heated to supply hot water.

  In the hot water supply operation, the compressors 1a and 1b are operated by performing rotation speed control according to the hot water supply load such as the water supply temperature and the hot water supply temperature.

  During the bathroom heating / drying operation, only the bathroom heating / drying side refrigerant circuit 41 is operated, and the high-temperature and high-pressure refrigerant compressed by the compressor 1a flows into the bathroom heating / drying refrigerant pipe 8a through the refrigerant opening / closing valve 2b. The heat medium flowing through the heating / drying water pipe 8b is heated, and the low-pressure and low-temperature refrigerant passes through the decompression device 4c and the evaporator 5a, and returns to the compressor 1a. By repeating this refrigerant circulation, the bathroom heating and drying heat medium can be continuously heated and heated.

  During the bathroom heating / drying operation, the refrigerant circulation amount of the heat pump refrigerant circuit is controlled by returning a part of the refrigerant from the refrigerant compression intermediate portion of the compressor 1a between the evaporator 5a and the compressor 1a. To reduce the load on the compressor 1a, and a stable operation can be obtained even at a low speed (about 1000 rpm). This is the same even when the drying function is mainly used. In this case, the operation may be performed at a lower speed (about 600 to 700 rotations), but a stable operation can be obtained by controlling the capacity.

  In addition, when bathing, only the bath-side refrigerant circuit 42 is operated, and the high-temperature and high-pressure refrigerant compressed by the compressor 1b flows into the bath refrigerant pipe 7a through the refrigerant on-off valve 2d and flows into the bath water pipe 7b. The bath water flowing through is heated, and the refrigerant that has become low pressure and low temperature through the decompression device 4b and the evaporator 5b returns to the compressor 1b. By repeating this refrigerant circulation, the bath water can be continuously heated and bathed.

In the bath reheating operation, the compressor 1b is operated by performing rotation speed control according to the hot water supply load such as the bath water temperature and the ambient temperature.
Next, the hot water supply circuit 45 includes a water circulation circuit for performing kitchen hot water supply, bath hot water supply, and bath reheating.

  The kitchen hot water supply circuit includes a water supply fitting 10, a pressure reducing valve 11, a water supply amount sensor 12, a water check valve 13, a water supply side heat transfer pipe 3c, 3d, a hot water supply mixing valve 16, a hot water mixing valve 17, a flow rate adjusting valve 18, a kitchen hot water supply. Metal fittings 19 are sequentially connected via a water pipe.

  The water supply fitting 10 is connected to a water supply source such as a water supply, and the kitchen tap fitting 19 is connected to a kitchen faucet 20 or the like.

  The bath hot water supply circuit includes a water supply fitting 10, a pressure reducing valve 11, a water supply water amount sensor 12, a water check valve 13, a water supply side heat transfer pipe 3c, 3d, a hot water supply mixing valve 16, a hot water mixing valve 17, a flow rate adjusting valve 18, a bath note. A hot water valve 21, a flow switch 22, a bath circulation pump 23, a water level sensor 24, and a hot water inlet / outlet fitting 25 are sequentially connected via a water pipe.

The bath reheating circuit has a structure in which an incoming / outgoing hot water fitting 25, a water level sensor 24, a bath circulation pump 23, a flow switch 22, a bath water pipe 7b of the bath heat exchanger 7, and a bath hot water fitting 28 are sequentially connected via a water pipe. Has been.
The hot water fitting 25 is connected to the bathtub 27 via a bath circulation adapter 26. When the bath is hot, hot water is supplied from the water level sensor 24 side to the bathtub 27 side, and when the bath is replenished, from the bathtub 27 side to the water level sensor 24 side. It is configured to circulate water.

  When bathing, the bath circulation pump 23 is operated to circulate the bath water using the bath chasing circuit, and the heat pump operation is performed by controlling the number of revolutions of the bath-side refrigerant circuit 42, so that the bath heat exchanger 7 is operated. Then, the remaining hot water in the bathtub 27 is heated and returned to the bathtub 27 for bathing.

  Next, in the bathroom heating / drying operation, the capacity control operation of the bathroom heating / drying side refrigerant circuit 41 is performed by performing the capacity control operation of the compressor 1a, and the bathroom heating / drying circulation pump 9 is operated to perform the bathroom heating / drying operation. The heating medium heated in the heat exchanger 8 is used as a bathroom heating / drying water pipe 8b, a bathroom heating / drying hot water supply 29, a bathroom heating / drying hot water supply pipe 31a, 32a, a bathroom heating / drying return fitting 30, and a bathroom heating / drying. By circulating in the bathroom heating / drying circuit of the circulation pump 9 for bathroom heating / drying water pipe 8b, the heat medium absorbs heat in the water heating / drying water pipe 8b, and dissipates heat in the water heating / drying water pipes 31a, 32a for bathroom heating. Drying is performed.

  Next, the operation control means 55 performs operation / stop of the heat source circuit 40, rotation speed control and capacity control of the compressors 1a and 1b, and control of the refrigerant on-off valves 2a to 2 by operation settings of the kitchen remote controller 56 and the bath remote controller 57. Opening / closing of the refrigerant open / close valve 2d, adjustment of the refrigerant throttle amount of the decompression devices 4a, 4b, 4c, operation / stop of the bathroom heating / drying circulation pump 9, the tank circulation pump 15 and the bath circulation pump 23, and the hot water mixing valve 16, hot water mixing By controlling the valve 17, the flow rate adjusting valve 18, and the bath pouring valve 21, a hot water supply operation, a bath hot water operation, a bath reheating operation, a bathroom heating drying operation, and the like are performed.

Further, the operation control means 55 controls the rotation speed of the compressors 1a and 1b, and immediately after the start of operation, the operation control means 55 operates at a predetermined high speed rotation speed in order to shorten the heating start-up time. During operation, it is controlled to operate at a low speed corresponding to the heating temperature.
Furthermore, the heat pump water heater includes a water supply thermistor that detects the temperature of the water supply, a heat exchanger thermistor that detects the temperature of the hot water supplied from the heat exchanger 3 for hot water supply, a hot water thermistor that detects the temperature of the hot water, a bath thermistor that detects the temperature of the bath water, And a pressure sensor (not shown) for detecting the discharge pressure of the compressors 1a and 1b, a water level sensor 24 for detecting the water level in the bathtub 27, and the like, and each detection signal is input to the operation control means 55. It is comprised so that. The operation control means 55 controls each device based on these signals.
The operation control means 55 is set with a priority in the case where the heating capacity is insufficient due to the simultaneous use of the use terminals, and when the hot water supply use and the bathroom heating / drying use or the bath reheating use are performed simultaneously. Priority is given to hot water supply operation, and in the case of using kitchen hot water and bath hot water, priority is given to kitchen hot water operation.
Next, the pressure reducing valve 11 controls, for example, a high water pressure with a variation of 200 to 600 kPa supplied from a water supply source water supply to a constant water pressure suitable for use of about 170 kPa. The water flows only in one direction to prevent backflow.

Next, the operation of the heat pump water heater of the present invention will be described based on the flowcharts of FIGS. 2 to 6 with reference to the heat pump circuit 40 and the hot water supply circuit 45 of FIG.
FIG. 2 is an example of a flowchart showing the necessary operations during installation.
The heat pump water heater is transported from the manufacturing site and installed at the installation location desired by the user. The water supply fitting 10 is used as a water supply source such as water supply, the kitchen hot-water supply fitting 19 is connected to the kitchen faucet 20, the hot-and-cold fitting 25 and the bath hot water supply. After the metal fitting 28 is connected to the bath circulation adapter 26 (step 60), the kitchen faucet 20 is opened for venting air (step 61), and the main plug of the water supply source is opened (step 62). After being started, water is decompressed and adjusted to a constant pressure by the decompression valve 11, and then flows into the hot water supply heat exchanger 3 and each water pipe (step 63). After confirming that the in-machine water circuit is full due to overflow of water from the kitchen faucet 20 (step 64), the kitchen faucet 20 is closed and the in-machine water supply is terminated (step 65).
In addition, each apparatus at the time of installation of a heat pump water heater is set to the following initial states. That is, the hot water mixing valve 16 and the hot water mixing valve 17 are in a three-way open state, the flow rate adjusting valve 18 is fully open, and the bath pouring valve 21 is fully closed.

Next, the power switch is turned on (step 66), and the bath water filling operation is performed (step 67).
In the bathtub water filling operation, the bath pouring valve 21 is opened and water is poured into the bathtub 27 until the bathtub 27 overflows to determine whether the bathtub 27 is full (step 68). The water level sensor 24 and the water supply amount sensor 12 determine the water level and the amount of water in the bathtub 27. The operation control means 55 automatically calculates the relationship between the total capacity of the bathtub 27 and the amount of water and the height of the water level (step 69), and sets the appropriate amount of water in the bathtub and the amount of change in the water level based on the additional amount of water (step 70). This is used for bath hot water filling and automatic hot water control after setting, etc. Therefore, the bath water filling operation is required only once when the heat pump water heater is set.
Next, FIG. 3 is an example of a flowchart showing the operation when the kitchen faucet 20 is opened and hot water is used.
When the kitchen faucet 20 is opened and the use of hot water begins (step 71), the feed water amount sensor 12 detects the flow rate and determines the start of hot water supply (step 72). The operation control means 55 starts the compressors 1a and 1b and starts the heat pump operation (step 73), the water supply fitting 10, the pressure reducing valve 11, the water supply amount sensor 12, the water check valve 13, and the water supply side heat transfer tube. 3c, 3d, hot water mixing valve 16, hot water mixing valve 17, flow rate adjusting valve 18, kitchen hot metal fitting 19, and hot water supply circuit of kitchen faucet 20 start hot water supply (step 74).

  Here, the operation control means 55 operates the compressors 1a and 1b with rotational speed control, circulates the compressed high-temperature and high-pressure refrigerant, and at the same time opens the refrigerant on-off valve 2a and the refrigerant on-off valve 2c of the heat source circuit 40. By closing the on-off valve 2b and the refrigerant on-off valve 2d, the refrigerant circulates in the hot water supply heat exchanger 3, but the refrigerant is not circulated in the bath heat exchanger 7 and the bathroom heating drying heat exchanger 8. Further, the decompression devices 4a and 4b are adjusted to be opened, and the decompression device 4c is closed.

That is, the high-temperature and high-pressure refrigerant compressed by the compressors 1a and 1b is sent to the refrigerant-side heat transfer tubes 3a and 3b of the hot water supply heat exchanger 3, and the feed water flowing through the water-supply side heat transfer tubes 3c and 3d is heated to supply the hot-water mixing valve 16 However, immediately after the start of operation, the refrigerant sent to the hot water supply heat exchanger 3 is sufficiently hot and high in pressure, the temperature is low, and the entire hot water heat exchanger 3 is cold. The heating capacity for heating is not sufficient. As the time elapses, the refrigerant becomes high temperature and high pressure, and accordingly, the amount of heat released from the refrigerant increases and the heating capacity to water increases. However, the hot water supply temperature reaches an appropriate temperature (about 40 ° C.) from the start of this operation. At the start of the operation, the hot water stored in the hot water storage tank is discharged at a temperature higher than the appropriate temperature and mixed with the hot water coming from the water supply side heat transfer tubes 3c and 3d by the hot water mixing valve 16 to obtain a high temperature water higher than the appropriate temperature. Further, an appropriate amount of cold water from the feed water amount sensor 12 side is mixed by the hot water / mixing valve 17 and adjusted to an appropriate temperature for use, and then hot water is supplied to the kitchen faucet 20 through the flow rate adjusting valve 18 and the kitchen outlet 19.
In the hot water supply operation, both the bathroom heating / drying side refrigerant circuit 41 and the bath side refrigerant circuit 42 of FIG. 1 are operated, and the compressors 1a and 1b are controlled by the operation control means as shown in FIG. 4 (a). In the summer season when the water supply temperature supplied from the water source, etc. is high, a small heating amount is sufficient. Therefore, as shown by point B, the rotation speed is lowered, and in the winter when the water supply temperature is low, a large heating amount is required. Operate at a higher speed as indicated by the dot.
In a conventional hot water storage type heat pump water heater, the compressor is operated at 2000 to 3000 revolutions to store hot water. When using floor heating, the hot water stored in the tank is circulated to perform floor heating and the compressor is not operated.
However, in the instantaneous heat pump water heater of the present embodiment, the hot water supply is operated like an instantaneous water heater by operating at a compressor rotation speed corresponding to the hot water use load. If the bathroom heating drying is performed using the hot water in the tank during the bathroom heating drying like a hot water storage heat pump water heater, the efficiency deteriorates. In the instantaneous type, the efficiency is improved by operating the compressor even during the bathroom heating drying. ing. Therefore, in the case of a light load (temperature difference is as small as 10 ° C., for example) as in the case of bathroom heating / drying, low-speed operation is required, and capacity control is performed as a countermeasure.
FIG. 4B shows the relationship between the compressor rotational speed and the heating capacity when the compressor is operated with rotational speed control and capacity control. When the bathroom heating / drying operation is performed, as described above, the temperature difference between the return and return of the heating medium for the bathroom heating / drying is only about 10 ° C. In the present invention, as indicated by point A, a capacity control operation that can be stably performed at a low speed is performed.
That is, in FIG. 1, only the bathroom heating / drying side refrigerant circuit 41 is operated, and the capacity control valve 6 is opened together with the compressor operation so that the intermediate pressure portion of the compressor 1a is connected between the evaporator 5a and the compressor 1a. The refrigerant is returned to reduce the refrigerant circulation amount, adjust the heating capacity, and reduce the load on the compressor so that stable operation can be continued.
Returning to FIG. 3, after the hot water supply operation is started (step 74), the operation control means 55 adjusts the hot water supply temperature and flow rate based on the detection data of the water supply amount sensor 12, the water supply thermistor, the hot water thermistor, etc. (step 75), Continue hot water supply operation at an appropriate temperature and flow rate.
It should be noted that the hot water supply temperature and flow rate are always determined (step 76). If within the specified range, the hot water supply is continued until the faucet is closed (step 77).
When the kitchen faucet 20 is closed and the use of hot water is finished (step 78), the operation control means 55 stops the compressors 1a and 1b (step 79), and the operation is finished (step 80).

  FIG. 5 is an example of a flowchart showing a hot water filling operation by bath automatic operation. The bath automatic button is pressed and turned on (step 91), and when the set time comes, bath hot water filling operation starts (step 92), the bath pouring valve 21 is opened, and bath hot water supply is performed (step 93).

The bath hot water supply (step 93) performs a heat pump operation in the same manner as the use of the hot water supply described in FIG. 3, and supplies hot water to the bathtub 27 instead of the kitchen faucet 20 in the bath hot water supply circuit.
During bath water supply operation, the bath thermistor detects the bath water supply temperature to determine the hot water supply temperature (step 94). If the temperature is not specified, the temperature is adjusted (step 94a). Continue (step 95).
Further, the water level in the bathtub is detected by the water level sensor 24, and the amount of bathing water is determined (step 96).
In the bath hot water amount determination (step 96), the bath hot water supply is continued (step 95) if it is not specified, and the bath hot water supply is stopped (step 97) when the value is within the specified range, and the compressors 1a and 1b are stopped. (Step 98) Thus, the hot water bathing operation ends (Step 99).

FIG. 6 is an example of a flowchart showing bath remedy by automatic bath operation. The bath automatic button is pressed and turned on (step 100). When the set time is reached, the bath filling operation described in FIG. 5 is started (step 101), and then the bath filling operation is terminated (step 102). Then, the bath heat insulation operation is started (step 103).
After the start of the bath warming operation (step 103), the bath temperature is detected by the bath thermistor, and the bath warming is continued if it is within the specified value in the bath temperature determination (step 104). Operation is performed (step 105). In addition, the water level sensor 24 detects the amount of hot water in the bathtub every predetermined time (for example, 10 minutes), and if the bath hot water amount determination (step 106) is within the specified value, the bath heat insulation is continued. Performs bath addition hot water operation (step 107).
Further, when the set time for automatic bath operation has elapsed, the bath heat retention operation is terminated (step 108), and the automatic bath operation is terminated (step 109).

  Although the said Example demonstrated the case where it applied to the direct hot water supply type heat pump system which has a hot water storage tank, it can apply also in the direct hot water supply type heat pump system which does not have a hot water storage tank, and has the same effect.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

In FIG. 7, components different from FIG. 1 are a heating water pipe 37a on the heating side of the bath heat exchanger 37, a heating water on / off valve 35 for opening and closing the flow of the heating water to the heating water pipe 37a, and a hot water supply. These are three points of the heat exchange flow sensor 36 for detecting the flow rate of the heat exchanger 3.
In FIG. 7, the difference from the first embodiment described in FIG. 1 is that the bath refrigerant pipe 7 a that is the heating side of the bath heat exchanger 7 is heated by the hot water supply heat exchanger 3. This is a point that the heating water pipe 37a for flowing warm water flowing from the heat transfer tubes 3c and 3d through the heating water on / off valve 35 is replaced.

  Further, the purpose and effect thereof are to avoid flowing a high-pressure refrigerant through the bath heat exchanger 37 by replacing the bath refrigerant tube 7a of the bath heat exchanger 7 shown in FIG. 1 with a heating water pipe 37a. Therefore, the heat pipe 37a can be made thinner and lighter and the bath heat exchanger 37 can be made smaller, and the entire bath heat exchanger 37 can be made into a double-pipe structure. It is to be able to plan.

  Further, the heating water on / off valve 35 is opened only during the bath reheating operation so that the heating water from the water supply side heat transfer tubes 3c and 3d can flow into the heating water piping 37a and the bath water flowing through the bath water piping 37b can be heated. To do.

  The heat exchange flow rate sensor 36 detects the flow rate of the hot water supply heat exchanger 3 and performs more detailed operation control, and can also be applied to the first embodiment.

  In the above-described configuration, the second embodiment performs the same operation and action as the first embodiment in the heat pump operation, the hot water supply operation, the bathroom heating / drying operation, the bath hot water filling and the bath automatic operation, and obtains the same effect. Can do.

It is a schematic diagram which shows one Example of schematic structure of the heat pump refrigerant circuit of the heat pump hot water supply bathroom heating drying apparatus, the hot water supply circuit, the bathroom heating drying circuit, the operation control means, and components in the 1st Example of this invention. It is a flowchart which shows one Example of the confirmation operation | movement at the time of installation and piping connection in the heat pump hot-water supply bathroom heating drying apparatus of this invention. It is a flowchart which shows one Example of the operation | movement at the time of kitchen hot-water supply in the heat pump hot-water supply bathroom heating drying apparatus of this invention. In the heat pump hot water supply bathroom heating and drying apparatus of the present invention, it is an operational characteristic diagram showing an example of the relationship between the rotation speed of the compressor and the heating capacity during rotation speed control and capacity control. It is a flowchart which shows one Example of the operation | movement at the time of the bath hot water filling by the bath automatic operation in the heat pump hot-water supply bathroom heating drying apparatus of this invention. It is a flowchart which shows one Example of the operation | movement at the time of the bath heat retention in the bath automatic operation in the heat pump hot-water supply bathroom heating drying apparatus of this invention. It is a schematic diagram which shows one Example of schematic structure of the heat pump refrigerant circuit of a heat pump hot-water supply bathroom heating drying apparatus, a hot-water supply circuit, a bathroom heating-drying circuit, an operation control means, and components in the 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b ... Compressor 2a-2d ... Refrigerant on-off valve 3 ... Heat exchanger 4a-4c for hot water supply ... Decompression device 5a, 5b ... Evaporator 6 ... Capacity control valve 7 ... Heat exchanger 8 for bath ... For bathroom heating drying Heat exchanger 9 ... Bathroom heating / drying circulation pump 10 ... Water supply fitting 11 ... Pressure reducing valve 12 ... Water supply water amount sensor 13 ... Water check valve 14 ... Hot water storage tank 15 ... Tank circulation pump 16 ... Hot water supply mixing valve 17 ... Water supply mixing valve 18 ... Flow rate adjusting valve 19 ... Kitchen tap fitting 20 ... Kitchen faucet 21 ... Bath pouring valve 22 ... Flow switch 23 ... Bath circulation pump 24 ... Water level sensor 25 ... Bath bath adapter 26 ... Bath circulation adapter 27 ... Bath 28 ... Bath bath Metal fitting 29 ... Hot water supply fitting 30 for bathroom heating / drying ... Metal fittings 31/32 for bathroom heating / drying ... Bathroom heating / drying device 35 ... Heating water on-off valve 36 ... Heat exchange flow sensor 40 ... Heat source circuit 41 ... Bathroom heating / drying side refrigerant circuit 42 ... bath side refrigerant circuit 45 ... hot water supply circuit 50 ... bathroom heating drying circuit 55 ... operation control means 56 ... Kitchen remote control 57 ... bath remote controller

Claims (6)

A heat source circuit consisting of a heat pump refrigerant circuit composed of a compressor, a refrigerant on-off valve, a heat exchanger for hot water supply, a heat exchanger for bathroom heating and drying, a decompression device, and an evaporator, and supplies hot water by heating the supplied water A hot water supply circuit for heating and a bathroom heating drying circuit for heating the circulating heat medium to supply heat,
When supplying heat to the hot water supply circuit, the number of revolutions of the compressor is controlled, and when supplying heat to the bathroom heating / drying circuit, capacity control of the compressor is performed. .   The heat pump refrigerant circuit is provided with a capacity control valve between the refrigerant compression intermediate part of the compressor and the evaporator and the compressor, and the capacity control valve is closed during the rotation speed control of the compressor, The heat pump hot water supply bathroom heating / drying apparatus according to claim 1, which is opened during capacity control.   The heat pump hot water bathroom heating / drying apparatus according to claim 1, wherein the heat source circuit is constituted by a plurality of heat pump refrigerant circuits, the plurality of heat pump refrigerant circuits are operated during hot water supply, and the single heat pump refrigerant circuit is operated during bathroom heating / drying. The heat source circuit is composed of two heat pump refrigerant circuits with and without a capacity control function, and both heat pump refrigerant circuits are operated during hot water supply, and only the heat pump refrigerant circuit with capacity control is used during bathroom heating and drying. 4. The heat pump hot water bath heating / drying apparatus according to claim 3, wherein only the heat pump refrigerant circuit that does not have capacity control is operated when the bath is operated. 2. The heat pump hot water supply bathroom heating and drying device according to claim 1, wherein the operation control means performs rotation speed control giving priority to hot water supply operation when hot water supply use and bathroom heating drying use or bath reheating use are performed simultaneously. The heat pump hot water supply bathroom heating according to claim 1, wherein the hot water supply circuit includes a tank hot water supply circuit for supplying hot water from a hot water storage tank to a use terminal, and a direct hot water supply circuit for supplying hot water heated by a heat exchanger for hot water supply directly to the use terminal. Drying equipment.

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