JPS6291786A - Heat pump type drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of Part B relates to a heat pump dryer that dries indoor air using a heat pump.

[Conventional technology]

Conventionally, there has been a device of this type as shown in FIG. Figure 3 is shown, for example, in Figures 7 and 14 on page 446 of Air Conditioning and Sanitary Engineering Handbook, ■Air Conditioning Layer (September 5, 1973, revised 9th edition, 3rd printing). . Third
In the figure, an evaporator 2 is provided in a return duct 1 from the indoor side, a condenser 4 is provided in a sub-duct I-3 to the indoor side, and a compressor 5 and an accumulator 6 are connected to each other by refrigerant piping. to a connected heat pump. l
:The supply-side blower 8 installed on the leeward side of the condenser 4 circulates the indoor air while dehumidifying and heating the indoor air.

That is, the return air from the room is sucked into the return duct 1 by the supply side blower 8, and the return air is drawn into the return duct 1.
It passes through an evaporator 2 in the supply duct 3 to be dehumidified, and further passes through a condenser 4 in a supply duct 3 to be heated and is sent indoors. In this way, the room air is dehumidified and then heated and supplied back into the room as dry air.

[Problem that the invention seeks to solve]

Conventional heat pump dryers are configured as described above, so if the relative humidity of the return air from the indoor side is not high, when the return air passes through the evaporator 2, the humidity of the return air is lower than the dehumidification of the return air. In many cases, only cooling is performed, and the absolute humidity and dry bulb temperature of the air supplied into the room after being heated by the condenser 4 are approximately equal to the absolute humidity and dry bulb temperature of the return air from the indoor side at that time. However, there was a drawback that the effect of dehumidifying and heating the return air by the heat pump was reduced.

This invention was made in order to solve the above-mentioned drawbacks of the conventional ones.The absolute humidity of the return air after passing through the evaporator is compared with the absolute humidity of the outside air (), and the absolute humidity of the return air after passing through the evaporator is compared (). The aim is to supply air with lower absolute humidity to the indoor side by sucking the air into the supply duct and heating it with a condenser.

[Means for solving problems]

The top pump type dryer according to the present invention is provided with an outlet for returning air from the indoor side on the return duct side, an outside air intake on the supply duct side, and an outlet and an outside air intake. Dampers that can be opened and closed are provided at required locations in each duct and in the connection duct between the return duct and supply duct, and a dry bulb temperature sensor and a relative humidity sensor are installed on the leeward side of the generator. A dry bulb temperature sensor and a relative humidity sensor for outside air are installed near the entrance, and the temperature and humidity are detected by these dry bulb temperature sensors and relative humidity sensors, and the absolute humidity of each air is calculated from the detected value. It is equipped with a control device that compares the humidity value with the absolute humidity of the outside air and, based on the comparison results, controls the opening and closing of each damper installed in each duct and the on/off control of each blower.

[Effect]

In this invention, the absolute humidity is calculated in the control device based on the detected values of a dry bulb temperature sensor and a relative humidity sensor provided on the leeward side of the evaporator, and a dry bulb temperature sensor provided near the outside air intake port calculates the absolute humidity. The absolute humidity is calculated based on the detected value of the relative humidity sensor, and by comparing the magnitude of the two calculated absolute humidity values and controlling the opening and closing of each damper installed in each duct I. , a closed method in which return air from the indoor side is passed through an evaporator and then passed through a condenser to be supplied indoors, and a closed method in which return air from the indoor side is passed through an evaporator and then discharged from the outlet as is, and outside air is It is operated by either an open method or an open method in which outside air is sucked in from one intake and is supplied indoors through a condenser.

〔Example〕

FIG. 1 is an overall configuration diagram of an embodiment of a P1-pump type dryer according to the present invention. In this figure, 1 to 6 and 8 are the same as in FIG. 3, and 7 is a return side blower provided on the windward side of the evaporator 2. 9 is a discharge port for discharging return air from the room of the return duct 1;
A damper 10 is provided in the return duct 1 near the discharge port 9.

Reference numeral 11 denotes an outside air intake port for introducing outside air into the supply duct 3, and a damper 12 is provided in the supply duct 3 near this outside air intake port 11. Further, a damper 14 is provided in the connecting duct 13 between the return duct 1 and the supply duct 3, and each of these dampers 10, 12, 14 is provided so as to be openable and closable. Furthermore, a dry bulb temperature sensor 15 and a relative humidity sensor 16 are provided on the leeward side of the evaporator 2, and a dry bulb temperature sensor 17 and a relative humidity sensor 18 for outside air are provided near the outside air intake port 11. a control device 19 that detects the temperature and humidity at the pump, controls the opening and closing of each damper 10, 12° 14, and controls the on/off of the heat pump, the return side blower 7, and the supply side blower 8;
is provided.

FIG. 2 is a control flow diagram of closed mode operation and open mode operation.

Next, the operation of the above embodiment will be explained with reference to FIGS. 1 and 2 (7). Note that (1) to (6) in FIG. 2 indicate each step.

In the system according to the present invention, when the system starts operating, the system is in a closed system, the heat pump and the supply side blower 8 are on, and the return side blower 7 is off. Also, damper 10 and damper 12 are fully closed,
The damper 14 is fully open (1).

The control device 19 calculates the absolute humidity XJ1 of the return air after passing through the evaporator 2 from the detected values of the dry bulb temperature sensor 15 and the relative humidity sensor 16. (2), and the absolute humidity xO of the outside air is calculated from the detected values of the dry bulb temperature sensor 17 and relative humidity sensor 18 (3). Comparing the magnitude relationship of these two absolute humidity XR and Xa (4), if the value of XR is smaller, the system remains in the closed method (if the value of 5L The system changes to an open system, fully opening the dampers 10 and 12, fully closing the damper 14, and turning on the return fan 7 (6).The absolute humidity xR of the return air and the absolute humidity Xo of the outside air are constantly calculated. Ori,
When the value of xR becomes smaller than Xa, the system is switched to the closed mode again.

〔Effect of the invention〕

As explained above, this invention uses the absolute humidity of the return air after passing through the evaporator based on the detected values from the dry bulb temperature sensor and relative humidity sensor installed on the leeward side of the evaporator in the return duct. The absolute humidity of the outside air is constantly calculated based on the detected values from the outside air dry bulb temperature sensor and relative humidity sensor installed in the supply duct near the outside air intake 1, and the magnitude of the two values is compared. Since the control device is provided to control each damper, each blower, etc., it is possible to supply dry air with lower absolute humidity to the indoor side.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of an embodiment of a heat pump type dryer according to the present invention, Fig. 2 is a control flow diagram of closed type operation and open type operation, and Fig. 13 is a conventional heat pump type dryer. FIG. In the figure, 1 is a return duct, 2 (evaporator), 3 is a sub-duct, 4 is a condenser, 5 is a compressor, 6 is an accumulator, 7 is a return side blower, 8 is a supply side blower, 9 is a discharge port, 1o, 12°14 is Gunova,
11 is an outside air intake, 13 is a connection duct I, 15 and 17 are dry bulb temperature sensors, 16 and 18 are relative humidity sensors, and 19 is a control device. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) Figure 1 E! :l:9 Jgp Old Age Figure 2 Figure 3 Procedural Amendment (Voluntary) Showa Year, Month, Day, Elementary School 3, Relationship with the case of the person making the amendment Patent Applicant Address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent Address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo
．． 7IO Correct Subject Specification Claims Column 2 Detailed Description of the Invention Column and Drawing 6 Contents of Amendment (1) The claims of the specification are amended as shown in the attached sheet. (2) "1 Compressor 5" on page 2, line 19 of the specification is corrected to 1-Compressor 51. (3) Similarly, on page 4, line 20, "1 this value and" is corrected to "1 these absolute humidity of return air". (4) Similarly, turn on the 16 blower on page 5, lines 2-3. "Control off", turn on 16 blowers and heat pump,
"Off control" is corrected. (5) Similarly, on page 8, line 11, ``absolute humidity'' is corrected to ``1 absolute humidity''. (6) Correct figures 1 and 2 as shown in the attached sheet. 2. Claims A heat pump comprising an evaporator provided in a return duct, a condenser, a compressor, and an accumulation rake provided in a sub-duct, and in which these are connected by refrigerant piping, A return side blower is provided on the upper side, a discharge port for return air from the indoor side is provided on the return duct side, an outside air intake port is provided on the supply duct side, and the inside of the return duct near the discharge port and the outside air intake are provided on the supply duct side. A damper that can be opened and closed is provided in the sub-duct near the inlet and in the connection duct between the return duct and the supply duct, and a dry bulb temperature sensor and a relative humidity sensor are provided on the leeward side of the evaporator. A dry bulb temperature sensor and a relative humidity sensor for outside air are installed near the entrance, and the absolute humidity is detected from the humidity and humidity from these dry bulb temperature sensors and relative humidity sensors, and the absolute humidity of the return air and the absolute humidity of the outside air are calculated. and the opening/closing control of each of the dampers and the heat pump based on the comparison results. Turn on the return side blower and supply side blower. A heat pump type dryer characterized in that it is equipped with a control device that performs an off-side operation. Fig. 1 1. Blade and scissors holder Fig. 2

Claims (1)

[Claims] In a heat pump that includes an evaporator provided in a return duct, a condenser, a compressor, and an accumulator provided in a supply duct, and these are connected by refrigerant piping, a return side blower is provided on the windward side of the evaporator, A discharge port for return air from the indoor side is provided on the return duct side, an outside air intake port is provided on the supply duct side, and the inside of the return duct near the discharge port and the inside of the supply duct near the outside air intake port. , a damper that can be opened and closed is installed in the connection duct between the return duct and the supply duct, a dry bulb temperature sensor and a relative humidity sensor are installed on the leeward side of the evaporator, and a dry bulb for outside air is installed near the outside air intake. Equipped with a bulb temperature sensor and a relative humidity sensor, it detects absolute humidity from the temperature and humidity from each dry bulb temperature sensor and relative humidity sensor, compares this absolute humidity with the absolute humidity of the outside air, and based on the comparison result. A heat pump type dryer comprising a control device that controls opening and closing of each of the dampers and on/off control of a heat pump, a return side blower, and a supply side blower.