JPH05346273A - Heat pump type air conditioning device - Google Patents

Abstract

PURPOSE:To prevent the cooling capability or heating capability from decreasing even at the time of peak load in midsummer or intense cold season, etc. CONSTITUTION:A heat transfer device 13 equipped with adsorbing materials 14a, 15a which emit heat when adsorbing a refrigerant and absorb heat when eliminating the refrigerant, and first and second heat transfer units 14, 15 which are filled with the adsorbing materials 14a, 15a is provided. For example, when a cooling operation is performed, the refrigerant is moved from the first heat transfer unit 14 to the second heat transfer unit 15. Then, the circulation of the refrigerant of a heat pump circuit 1 is switched from an outdoor side heat- exchanger 3 to a bypass circuit 18, and at the same time, the refrigerant is moved from the second heat transfer unit 15 to the first heat transfer unit 14. At this time, the heat pump circuit side refrigerant in the bypass circuit 18 is cooled and condensed by the andothermic action of the adsorbing material 15a in the second heat transfer unit 15. Also, the opposite operation is performed by the heat transfer device 13 when a cooling operation is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner installed in a hotel, office building or store.

[0002]

2. Description of the Related Art Generally, a heat pump type air conditioner is equipped with a heat pump circuit having an indoor heat exchanger for exchanging heat with indoor air and an outdoor heat exchanger for exchanging heat with outside air. Cooling and heating operations are performed by switching the heat exchanger between the low pressure side and the high pressure side of the compressor.

[0003]

However, in the conventional heat pump type air conditioner, heat exchange of the outdoor heat exchanger is not sufficiently performed during peak load such as midsummer or severe cold season. Although the cooling capacity or the heating capacity is remarkably reduced, if the capacity is set in consideration of this, there is a problem that it becomes an excess facility.

The present invention has been made in view of the above problems, and it is an object of the present invention to prevent the cooling capacity or the heating capacity from deteriorating even during a peak load such as midsummer or severe cold season. An object is to provide a heat pump type air conditioner.

[0005]

In order to achieve the above object, the present invention provides a heat pump type air conditioner having a heat pump circuit having an indoor heat exchanger and an outdoor heat exchanger. Two heat transfer devices equipped with an adsorbent that radiates heat when a medium is adsorbed and absorbs heat when desorbed, and moving means that reciprocally moves the heat medium of the adsorbent from one heat transfer device to the other heat transfer device. And a bypass circuit that is in thermal contact with one of the heat exchangers and is connected in parallel to the outdoor heat exchanger of the heat pump circuit, and the heat medium of the heat pump circuit to the outdoor heat exchanger or bypass. And switching means for circulating the circuit.

[0006]

According to the heat pump type air conditioner of the present invention, when performing the cooling operation, first, one heat transfer device (the one thermally contacting the bypass circuit) is connected to the other heat transfer device. Move the heat medium. Next, while the heat pump circuit is operating, the flow of the heat medium in the heat pump circuit is switched from the outdoor heat exchanger to the bypass circuit, and the heat medium is moved from one heat exchanger to the other heat exchanger. .. At this time, in one heat transfer device, the heat medium of the heat pump circuit in the bypass circuit is cooled by the heat absorbing action of the adsorbent, and the heat medium is condensed. Also, when performing heating operation, first,
The heat medium is moved from one heat transfer unit to the other heat transfer unit. Next, while the heat pump circuit is operating, the flow of the heat medium in the heat pump circuit is switched from the outdoor heat exchanger to the bypass circuit, and at the same time, the heat medium is moved from one heat transfer device to the other heat transfer device. .. At this time, in one of the heat exchangers, the heat pump circuit side heat medium in the bypass circuit is heated by the heat radiation effect of the adsorbent, and the heat medium is evaporated.

[0007]

FIG. 1 shows an embodiment of the present invention.

In the figure, reference numeral 1 denotes a heat pump circuit using a refrigerant (heat medium) such as CFC, a plurality of indoor heat exchangers 2 for exchanging heat with indoor air, and an outdoor heat exchanger for exchanging heat with outside air. The heat exchangers 2 and 3 are provided with blower fans 2a and 3a, respectively. The heat exchangers 2 and 3 include a compressor 3, a compressor 4, a four-way valve 5, and an accumulator 6. The indoor heat exchangers 2 are provided in parallel with each other, and a check valve 7 is provided at one end of each.
Is connected to a capillary tube 8 provided in parallel. Further, a capillary tube 10 provided in parallel with the check valve 9 is also connected to one end of the outdoor heat exchanger 3,
One end side of each indoor heat exchanger 2 and one outdoor side heat exchanger 3 are connected to each other via each capillary tube 8 and 10. The other end of each indoor heat exchanger 2 is connected to the first refrigerant flow port 5a of the four-way valve 5, and the second refrigerant flow port 5b of the four-way valve 5 is connected to the refrigerant discharge side of the compressor 4. There is. The other end of the outdoor heat exchanger 3 is connected to the third refrigerant flow port 5c of the four-way valve 5, and the refrigerant suction side of the compressor 4 and the fourth refrigerant flow port 5d of the four-way valve 5 are accumulators. Connected to the computer 6. Further, a temperature sensor 11 and a pressure sensor 1 are provided between the outdoor heat exchanger 3 and the capillary tube 10.
Two are provided.

Reference numeral 13 denotes a heat transfer device arranged in parallel in the heat pump circuit 1, which comprises first and second heat transfer devices 14 and 15 respectively filled with adsorbents 14a and 15a such as zeolite, and a compressor 16. , Four-way valve 17. Each adsorbent 14a, 1
5a has a property of releasing heat when adsorbing a refrigerant (heat medium) and absorbing heat when desorbing it, and an alcohol system or the like is used as the refrigerant. The refrigerant inlet / outlet of the first heat transfer unit 14 is the first of the four-way valve 17.
Of the compressor 16 is connected to the second refrigerant flow port 17b of the four-way valve 17. Further, the refrigerant inlet / outlet of the second heat transfer unit 15 is connected to the third refrigerant flow port 17c of the four-way valve 17, and the four-way valve 17
The refrigerant suction side of the compressor 16 is connected to the fourth refrigerant circulation port 17d. That is, the compressor 16 and the four-way valve 17 constitute a refrigerant moving means.

Reference numeral 18 denotes a bypass circuit provided in the heat pump circuit 1. One end is between the capillary tubes 8 and 10, and the other end is between the outdoor heat exchanger 3 and the four-way valve 5. A three-way valve 19 as switching means is provided at the branch point on the one end side. Further, a part of the bypass circuit 18 is in thermal contact with the adsorbent 15a of the second heat transfer unit 15 and is capable of exchanging heat with the adsorbent 15a. Further, a temperature sensor 20 and a pressure sensor 21 are provided between the three-way valve 19 and the second heat transfer unit 13, and between the branch point on the other end side of the bypass circuit 18 and the second heat transfer unit 15. Is provided with a solenoid valve 22. Further, a capillary tube 24 connected in parallel with the check valve 23 is provided between the three-way valve 19 and the pressure sensor 21.

The operation of the air conditioner in the cooling operation will be described below.

First, the heat transfer device 13 is driven at night using electric power or the like at midnight. At this time, the first refrigerant circulation port 17a and the fourth refrigerant circulation port 17d of the four-way valve 17 are communicated with the second refrigerant circulation port 17b and the third refrigerant circulation port 17c, respectively, and the compressor 16 is operated. The first heat transfer device 14
The refrigerant is moved from the second heat transfer unit 15 to the second heat transfer unit 15 as indicated by the two-dot chain line arrow in the figure.

When the heat pump circuit 1 is driven, the first refrigerant flow port 5a and the fourth refrigerant flow port 5d of the four-way valve 5 and the second refrigerant flow port 5b and the third refrigerant flow port are also provided. 5c
And 3 are communicated with each other, the three-way valve 19 is opened to the heat pump circuit 1 side, and the compressor 4 is operated. As a result, the refrigerant discharged from the compressor 4 is four-way valve 5 → outdoor heat exchanger 3 → check valve 9 → capillary tubes 8 → indoor heat exchanger 2 → four-way valve 5 → compressor 4 It circulates as shown by the solid arrow in the figure. At this time, the high-pressure refrigerant in the outdoor heat exchanger 3 is cooled and condensed by the outside air, while the low-pressure refrigerant in each indoor heat exchanger 2 evaporates by heat exchange with the indoor air, and the indoor side is cooled. ..

Further, during peak loads such as midsummer,
When the condensation rate of the outdoor heat exchanger 3 decreases and the detection values of the temperature sensor 11 and the pressure sensor 12 exceed a predetermined upper limit value, the three-way valve 19 is switched to the bypass circuit 18 side and the solenoid valve 22 Is opened, and the high-pressure refrigerant of the heat pump circuit 1 is circulated to the bypass circuit 18. At the same time, the heat transfer device 13 is driven in the cycle opposite to the above operation. That is, the first refrigerant flow port 17a of the four-way valve 17 and the second refrigerant flow port 17a
The refrigerant flow port 17b, the third refrigerant flow port 17c, and the fourth refrigerant flow port 17d are communicated with each other, the compressor 16 is operated, and the second heat transfer unit 15 to the first heat transfer unit 14 are operated. The refrigerant is moved to the direction as indicated by the one-dot chain line arrow in the figure. At this time, the adsorbent 15a of the second heat transfer device 15 desorbs the refrigerant and absorbs heat, so that the bypass circuit 18 is cooled and the high-pressure refrigerant in the bypass circuit 18 is condensed. After this, the second
The refrigerant in the heat transfer device 15 completely moves and the endothermic effect of the adsorbent 15a disappears, and the temperature sensor 20 and the pressure sensor 2
When the detected value of 1 exceeds the predetermined upper limit value, the solenoid valve 22 is closed and the three-way valve 19 is switched to the heat pump circuit 1 side.

Next, the operation in the heating operation will be described.

First, the heat transfer device 13 is driven at night using electric power or the like at midnight. At this time, the first refrigerant flow port 17a and the second refrigerant flow port 17b of the four-way valve 17, the third refrigerant flow port 17c and the fourth refrigerant flow port 17d are respectively communicated, and the compressor 16 is operated. And then the second heat exchanger 15
The refrigerant from the first heat transfer device 14.

Further, when the heat pump circuit 1 is driven, the first refrigerant flow port 5a and the second refrigerant flow port 5b of the four-way valve 5, the third refrigerant flow port 5c and the fourth refrigerant flow port. 5d
And 3 are communicated with each other, the three-way valve 19 is opened to the heat pump circuit 1 side, and the compressor 4 is operated. As a result, the refrigerant discharged from the compressor 4 has a four-way valve 5 → each indoor heat exchanger 2 → each check valve 7 → capillary tube 10 → outdoor heat exchanger 3 → four-way valve 5 → compressor 4 It circulates as shown by the broken line arrow in the figure. At this time, the low-pressure refrigerant in the outdoor heat exchanger 3 is heated by the outside air to evaporate, while the high-pressure refrigerant in each indoor heat exchanger 2 is condensed by the heat exchange with the indoor air to heat the indoor side. ..

Further, at the rising of a severe cold season or at the time of peak load, the evaporation rate of the outdoor heat exchanger 3 decreases, and the detection values of the temperature sensor 11 and the pressure sensor 12 become below a predetermined lower limit value. In this case, the three-way valve 19 is switched to the bypass circuit 18 side, the solenoid valve 22 is opened, and the low pressure refrigerant of the heat pump circuit 1 is circulated to the bypass circuit 18. At the same time, the heat transfer device 13 is driven in the cycle opposite to the above operation. That is, the first refrigerant flow port 17a and the fourth refrigerant flow port 17d of the four-way valve 17, the second refrigerant flow port 1
7b and the third refrigerant flow port 17c are respectively connected to each other, the compressor 16 is operated, and the refrigerant is moved from the first heat transfer device 14 to the second heat transfer device 15. At this time, the second
Since the adsorbent 15a of the heat transfer device 15 adsorbs and radiates the refrigerant, the bypass circuit 18 is heated and the low-pressure refrigerant in the bypass circuit 18 evaporates. After this, the second heat transfer device 1
When the refrigerant completely moves into the inside of the adsorbent 5 and the heat dissipation effect of the adsorbent 15a disappears, and the detected values of the temperature sensor 20 and the pressure sensor 21 become equal to or lower than a predetermined lower limit value, the solenoid valve 22 is closed and the three-way valve 19 is closed. To the heat pump circuit 1 side.

In the above-described embodiment, the preparatory operation of the heat transfer device 13 is performed at night. However, when there are multiple peak load times in a day, the preparatory operation of the heat transfer device 13 is stopped. It may be performed in parallel with the operation of the top pump circuit 1. Also, if the compressor 16 of the heat transfer device 13 is variably controlled by an inverter or the like, the heat radiation amount or heat absorption amount of the adsorbent 15a in the second heat transfer device 15 can be adjusted according to the load. ..

As described above, according to the heat pump type air conditioner of this embodiment, the heat transfer device 13 utilizing the action of the adsorbent is provided, and the condensation rate or the evaporation rate of the outdoor heat exchanger 3 is lowered. When the heat transfer device 13 is used, the outdoor heat exchanger 3
Since the lack of capacity is compensated for, it is possible to reliably prevent the cooling capacity or the heating capacity from deteriorating during peak load such as midsummer or severe cold season. Therefore, it is possible to reduce the size of the entire apparatus and to significantly reduce the initial cost without the need for an excess facility assuming a peak load. In addition, since the midnight power can be used for the preparatory operation of the heat transfer device 13, it is possible to contribute to energy saving.

[0021]

As described above, according to the heat pump type air conditioner of the present invention, it is possible to surely prevent the cooling capacity or the heating capacity from being lowered during the peak load such as the midsummer or the severe cold season. In particular, it is extremely effective for an electric heat pump type air conditioner having a limited heating capacity, and it is possible to reduce the size of the entire device.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a heat pump type air conditioner showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat pump circuit, 2 ... Indoor side heat exchanger, 3 ... Outdoor side heat exchanger, 14 ... 1st heat exchanger, 15 ... 2nd heat exchanger, 14a, 15a ... Adsorbent, 16 ... Compressor, 17 ... four-way valve, 18 ... bypass circuit, 19 ... three-way valve

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F25B 27/02 F 8919-3L

Claims (1)

[Claims] 1. In a heat pump type air conditioner having a heat pump circuit having an indoor heat exchanger and an outdoor heat exchanger, an adsorbent which radiates heat when adsorbing a heat medium and absorbs heat when desorbing the heat medium. Two heat transfer devices, a moving means for reciprocally moving the heat medium of the adsorbent from one heat transfer device to the other heat transfer device, and one heat transfer device in thermal contact with the heat transfer device, and A bypass circuit connected in parallel to the outdoor heat exchanger of the heat pump circuit, and a switching means for circulating the heat medium of the heat pump circuit to the outdoor heat exchanger or the bypass circuit are provided. Heat pump type air conditioner.