JPS62223573A - 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, a compressor 1 sucks indoor air, pressurizes it to high temperature and high pressure, and then sends it to a heat exchanger 2 for heat radiation, and a fan 5 blows outdoor air on the outside of the heat exchanger 2 to cool it. Then, set at medium temperature and high pressure. After this, the air is expanded by an expander 3 to a low temperature and pressure, and the cold heat is blown out directly into the room, or indoor air is applied to a heat exchanger 6 with a fan 7 to exchange heat and cool the room. The disadvantages of this air cycle heat pump are that, as mentioned above, the heat transfer medium flowing through the cycle is air, so only its sensible heat can be used, and the heat transfer coefficient of air is also small, so its cooling capacity is However, the device size is large, the amount of circulation of the heat transfer medium (air) is large, and it has the disadvantages of large noise and vibration.

[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 water vapor separation membrane is placed in a heat exchanger on a path connecting a compressor and an expander, and the water vapor separated by this separation membrane is condensed. This is an air cycle heat pump that sprays this water into the path downstream of the expander.

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 exchanger 2 for heat radiation, and a fan 5 is used to send it to the outside air. Cool by blowing air to bring it to medium temperature and high pressure. After this, the air is expanded by an expander 3 to a low temperature and pressure, and the cold heat is blown out directly into the room, or indoor air is applied to a heat exchanger 6 with a fan 7 to exchange heat and cool the room.

The heat transfer medium passage (2) of the heat exchanger 2 for heat dissipation is formed into a cylindrical shape using a water vapor separation membrane, and a water droplet tray 8 is installed at the bottom of the heat transfer medium passage (2) to separate it from the air, store the condensed water, and expand it in the communication pipe 9. It is configured to spray into a path upstream of the heat exchanger 6 for heat absorption downstream of the machine 3.

As shown in FIGS. 1 and 2, the heat exchanger 2 for heat radiation is
A large number of cylindrical heat transfer medium passages (1) formed of water vapor separation membranes are arranged in parallel, and air, which is a heat transfer medium, flows through the inside, and a fan 5 blows wind onto it. A water droplet tray 8 is provided at the lower part of the heat transfer medium passage (2) arranged in parallel in the heat exchanger 2 for heat dissipation.

The operating state will be explained below. When air is sucked in from outdoors and pressurized by the compressor 1, adiabatic compression occurs and the air becomes high temperature and high pressure. In this state, it is sent to the heat exchanger 2 for heat dissipation, but since the heat transfer medium passage (■) of the heat exchanger 2 is made of a water vapor separation membrane, only the water and steam in the air are separated by the pressure difference. Go outside. Since this water vapor has a higher temperature than the indoor air, it is condensed on the outside of the heat transfer medium passage (2) by the air sent by the fan 5. On the other hand, the air as a heat transfer medium that has passed through the heat exchanger 2 passes through the expander 3 and expands adiabatically, and the air itself becomes low temperature and low pressure. is recovered to the compressor 1 via the motor 4 (
As a result, the electrical energy to be introduced into the motor 4 becomes extremely small). Next, on the downstream side of the expander 3, condensed water is sprayed onto the low temperature, low pressure, dry air near the inlet of the heat exchanger 6 for heat absorption. Condensed water droplet tray 8
The collected water is led to a high-speed air stream below the expander 3 using, for example, an extremely thin pipe and is sprayed in the same manner as a mist sprayer.

As a result, the water absorbs heat from the surroundings and evaporates, allowing the heat exchanger 6 to perform cooling more efficiently than with air alone.

In this embodiment, the heat exchanger 6 is used for heat absorption, but the air itself may be blown into the room.

〔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.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. FIG. 3 is a schematic diagram showing a conventional example. 1... Compressor, 2... Heat exchanger, 3... Expander,
4... Motor, 5... Fan, 6... Endothermic heat exchanger, 7... Fan, 8... Water drop tray, 9... Communication pipe.

Claims (1)

[Claims] (1) In a reverse Brayton air cycle heat pump, a water vapor separation membrane is placed in the heat exchanger on the path connecting the compressor and expander, and the water vapor separated by this separation membrane is condensed, and this water is An air cycle heat pump that sprays water into the path downstream of the expander.