JPS62223572A - Air cycle heat pump - 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] 〔Technical field〕 This invention relates to air cycle heat pumps.

[Background technology]

The conventional reverse Brayton type air cycle heat pump is
The configuration was as shown in Figure 3.

That is, indoor air is sucked in by the compressor 1, pressurized to high temperature and high pressure, and then sent to the heat radiating heat exchanger 4, and outdoor air is blown onto the outside of the heat radiating heat exchanger 4 by the fan 5. Cool and bring to medium temperature and high pressure. After this, expander 2
The structure is such that the air is expanded to a low temperature and low pressure, and the cooled heat is blown out directly into the room or is exchanged with heat via the endothermic heat exchanger 6 to cool the room. The disadvantages of this air cycle heat pump are that, as mentioned above, since the heat transfer medium flowing through the cycle is air, only its sensible heat can be utilized, and the heat transfer coefficient of air is also small, so its cooling capacity is However, the disadvantages are that the device size is large, the amount of heat transfer medium (air) circulated is large, and noise and vibration are large.

In addition, 3 in the figure is a motor that drives the compressor 1 and the expander 2 coaxially.

[Purpose of the invention]

An object of the present invention is to provide a compact air cycle heat pump with less noise and vibration.

[Disclosure of the invention]

The gist of this invention is that in a reverse Brayton type air cycle heat pump, a heat radiation heat exchanger formed of a water vapor separation membrane is disposed on a path connecting a compressor and an expander, and the heat radiation heat exchanger is covered. The bottom of the cover is connected to the water spray part of the heat exchanger for heat absorption, and the water vapor separated in the heat exchanger for heat radiation is sprayed from the water spray part into the heat exchanger for heat absorption. It is a heat pump.

The present invention will be explained below based on the illustrated examples shown in FIGS. 1 and 2.

Basically, a compressor 1 sucks indoor (or outdoor) air, pressurizes it to high temperature and high pressure, and then sends it to a heat radiating heat exchanger 4, which is then fed by a fan 5. Cool by blowing outdoor air to medium temperature and high pressure. It is then expanded by an expander 2 to bring it to a low temperature and low pressure, and the cold energy is blown out directly into the room or exchanged with heat via an endothermic heat exchanger 6 to cool the room. 3 in the diagram
is a motor that drives the compressor 1 and expander 2 on the same shaft 12.

As shown in FIGS. 1 and 2, the heat exchanger 4 for heat dissipation is made up of a number of cylindrical heat transfer medium passages (1) formed of water vapor separation membranes arranged in parallel, and the inside is filled with air as a heat transfer medium. is flowing.

The heat exchanger 4 for heat dissipation is covered with a cover 8 that covers and seals the entire body, and the lower part of the cover 8 is formed as a water reservoir part 12, and the inlet part of the heat exchanger 6 for heat absorption is formed with a thin tube 10. The water spray section 11 is connected to the water spray section 11. Furthermore, fins 9 are provided on the outside of the cover 8 to increase the amount of heat exchange.

The operating state will be explained below. A compressor 1 sucks air from outside, adiabatically compresses it, and raises the temperature. When this high-temperature, high-pressure air is sent into the heat-radiating heat exchanger 4 through the pipe 7, the heat-radiating heat exchanger 4 is made of a water vapor separation membrane, so that air flows from the high-pressure interior to the low-pressure exterior. Only water vapor flows out through the water vapor separation membrane. At this time, there is a cover 8 close to the outside of the heat exchanger 4 for heat dissipation, and there are also fins 9 on the outside of the heat exchanger 4, and since the fan 5 is used for cooling, the water vapor that flows out is absorbed by the inner surface of the cover 8. The air in the heat exchanger 4 for heat radiation is condensed, water vapor is reduced, and the air is cooled to become dry air at medium temperature and high pressure. Since the heat exchanger 4 is sealed with the cover 8, the water vapor separated between the covers 8 by the water vapor separation membrane tends to become water droplets. If the water vapor is not sealed with the cover 8, the separated water vapor will not turn into water droplets unless the water vapor partial pressure becomes higher than the saturated vapor pressure of the surrounding air, but since the water vapor is sealed with the cover 8, the water vapor will immediately turn into water droplets. be.

After that, when the air passes through the expander 2, it expands adiabatically, and the pressure and temperature drop at the same time. In other words, it becomes dry air at low temperature and low pressure. On the other hand, as for the condensed water mentioned above, cover 8
The water is introduced to the inlet of the endothermic heat exchanger 6 through the water reservoir 12 at the lower part of the water reservoir 12 through the reservoir pipe 10, and is sprayed into the low temperature, low pressure, dry air at the water spray section 11. After that, the endothermic heat exchanger 6
The water that enters the interior absorbs heat from the outside and evaporates. When the air passes through the expander 3 and expands adiabatically, and the air itself becomes low temperature and low pressure, the work done by the air in the expander 3 is recovered by the compressor 1 via the motor 3 on the coaxial 12. ing. As a result, the electrical energy to be introduced into the motor 3 becomes extremely small.

The condensed water stored in the water reservoir 12 expands from the water spray section 11 at the inlet of the endothermic heat exchanger 6 through an extremely thin tube 10 as shown in the figure, and is exposed to the flowing high-speed air flow in the manner of atomizing. It is sprayed.

The water sprayed into the endothermic heat exchanger 6 absorbs heat from the surroundings and evaporates, allowing the endothermic heat exchanger 6 to perform cooling more efficiently than with air alone.

〔Effect of the invention〕

As described above, in the air cycle heat pump according to the present invention, not only the sensible heat of the air but also the latent heat of vaporization of the water are used to absorb heat, so the amount of air circulation is not required to be small, and the water is also used more than the air being circulated. Since it uses a water vapor separation membrane and can be easily extracted without requiring special power, the equipment size per capacity can be made more compact compared to conventional methods. This reduces noise and vibration.

The heat exchanger for heat dissipation formed with a water vapor separation membrane is sealed with a cover, and the water vapor separated by the water vapor separation membrane exits into the sealed cover, so it can be immediately returned to the water spray part as water droplets. The air cycle heat pump, which absorbs heat by utilizing the evaporation of water, operates smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view of the main part. FIG. 3 is a schematic diagram showing a conventional example. 1... Compressor, 2... Expander, 3... Motor,
4... Heat exchanger for heat radiation, 5... Fan, 6... Heat exchanger for heat absorption, 8... Cover, 9... Fin, 10
... tube, 11 ... spraying section.

Claims (1)

[Claims] (1) In a reverse Brayton type air cycle heat pump, a heat radiating heat exchanger made of a water vapor separation membrane is placed on the path connecting the compressor and the expander, the heat radiating heat exchanger is sealed with a cover, and the heat radiating heat exchanger is sealed with a cover. An air cycle heat pump in which the bottom of the cover is connected to a water spray part of an endothermic heat exchanger, and the water vapor separated by the heat radiating heat exchanger is sprayed from the water spray part into the endothermic heat exchanger.