JPS6127664B2 - - Google Patents

Description

[Detailed Description of the Invention] In outside air introduction type air conditioning equipment, heat exchange between the exhaust gas that is recirculated from the room to be air-conditioned to the outside and the introduced outside air is performed by a total heat exchanger (described later); The load on the air conditioner is reduced by effectively utilizing the heated or cooled exhaust gas.

The present invention relates to a pre-cooling/preheating device having such a total heat exchanger, which is efficient and capable of more effectively utilizing the heat of exhaust air or introduced outside air, even when the total heat exchanger is used under harsh conditions. A precooling and preheating device that does not cause damage or performance deterioration is realized with a relatively simple configuration.

An embodiment of the precooling and preheating device according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a configuration diagram showing the overall configuration of the precooling and preheating device, in which 1 is a room to be air-conditioned, 2 is an air conditioner, and 3
is a pre-cooling and pre-heating device, and in this embodiment, a case where the chamber 1 is a refrigerating room and is operated as a pre-cooling device will be explained. In the precooling device 3, 3
a is a conventionally installed rotary total heat exchanger 4
3b is a second precooling device added according to the present invention.

The first precooling device 3a includes a total heat exchanger 4, a heating sensible heat exchanger 6 and an air supply fan 7 installed downstream of the total heat exchanger 4 in an outside air introduction flow path 5, and an exhaust flow path. The exhaust fan 9 is installed downstream of the total heat exchanger 4 at 8.

The second precooling device 3b includes a heat pipe unit 1
0, a filter 11 that removes dust contained in the return air E from the refrigerator compartment 1, and a filter 12 that removes dust contained in the introduced outside air A.

As shown in FIG. 2 when viewed in the direction of airflow, the total heat exchanger 4 is made up of a corrugated plate 12 containing a moisture absorbent.
An asbestos rotor 14 is constructed by winding an asbestos corrugated board consisting of a flat plate 13 into a roll.
is configured to be rotated by the motor 15 via the drive belt 16, so that the outside air introduced through the upper half of the rotor 14 is cooled by the return air F when the rotor 14 passes through the lower half. It is cooled in the
While being dehumidified by the moisture absorbent, in the part of the rotor that passes through the lower half, it cools the area that was heated when passing through the upper half, and releases the moisture in the moisture absorbent into the air. . By continuously performing such operations as the rotor 14 rotates,
The outside air is continuously cooled and dehumidified in the upper half of the rotor.

As shown in FIG. 3 when viewed in the direction of air flow, the heat pipe unit 10 incorporated in the second precooling device 3b added according to the present invention has a rectangular housing 17 partitioned by a partition plate 18 to allow outside air to flow. Road 1
9 and a return air flow path 20, and a large number of heat pipes 21 are disposed to penetrate through the partition plate 18 so as to span these flow paths. As is well known, the heat pipe 21 has a working fluid sealed in a sealed tube, and when the working fluid evaporates, it absorbs heat from the high temperature fluid passing through a part of the outer surface of the tube, and the outer surface of the tube is heated. The cold fluid passing through the tube is heated by the condensation of the working liquid that has evaporated within the tube. Therefore, in the examples shown in Figures 1 and 3, by selecting a heat pipe containing a working liquid that meets the usage conditions, the high temperature outside air A is stripped of heat by the evaporation of the working liquid. The return air E is heated by condensation of the working liquid;
It is introduced into the first precooling device 3a.

Changes in the temperature and humidity of the air within the precooling device 3 are illustrated in FIG. In other words, if the state of each air is expressed in terms of temperature and humidity, outside air A (32.5°C, 65%) is heated by heat pipe unit 10.
It is cooled to B (24℃, 95%), and then cooled to C (19.5℃, 95%) in the total heat exchanger 4 of the first precooling device 3a.
55%) and dehumidified, further cooled to D (3°C, 98%) by the sensible heat exchanger 6, further cooled by the air conditioner 2, and then enters the refrigerator compartment 1. Refrigerator room 1
The return air E (3°C, 80%) that comes out of the
(17.5°C, 30%), heated and humidified by the total heat exchanger 4, and exhausted by the exhaust fan 9.

In FIG. 1, if there is no second precooling device 3b, when the humidity of the outside air becomes abnormally high, as shown by the dotted line G in FIG. 100%) may occur. In such cases, dew condensation may occur on the surface of the asbestos rotor element, and if the temperature of the return air E is extremely low, the element may freeze. In this case, the element may be damaged or its performance may deteriorate. occurs.

However, in the present invention, the return air E is heated by the heat pipe unit 10 and the total heat exchanger 4
By sending the air to the total heat exchanger 4, the air condition does not cross the saturation curve when passing through the total heat exchanger 4, and the total heat exchanger will not be damaged or its performance will deteriorate for the reasons mentioned above.

Moreover, in the heat pipe unit 10,
There is no need for a separate heat source such as heating steam, hot water, or an electric heater, which has been conventionally used, and there is no need for a pump or the like to flow a fluid as a heat medium.

In the above embodiment, an example has been described in which the room 1 is a refrigerating room and the total heat exchanger 4 etc. is operated as a pre-cooling device for outside air, but on the contrary, when used as a pre-heating device The same operation and effect can be achieved by the same structure.

When used as a preheating device, contrary to the above, the outside air will be heated as it passes through the heat pipe unit 10, while the return air will be cooled.

Due to the outside air preheating effect of the heat pipe unit, even when the humidity of the return air is extremely high or the outside air temperature is extremely low, the total heat exchanger 4
This prevents dew condensation or freezing from occurring on the element, preventing damage or performance deterioration.

As described above, the indoor air conditioner according to the present invention includes a heat pipe unit that exchanges heat between outside air and return air separately from the total heat exchanger, and preheats the return air or outside air and supplies it to the total heat exchanger. This eliminates the need for heating steam, hot water, electric heaters, etc. as separate heat sources that were previously required, so exhaust heat or outside air heat is effectively used, resulting in energy savings. achieved, and operating costs are low. Furthermore, the heat pipe can maintain a long service life without causing failure. Furthermore, the heat pipe unit does not require a pump or the like for the flow of the heat medium, and the structure can be simplified. moreover,
Damage and performance degradation due to condensation or freezing of the total heat exchanger can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of an indoor air conditioner according to the present invention, Fig. 2 is a diagram of an example of a total heat exchanger incorporated in the device shown in Fig. 1, viewed from the direction of airflow, and Fig. 3 Figure 4 is a diagram of the heat pipe unit incorporated in the device shown in Figure 1, viewed from the air flow direction.
This figure is an psychrometric diagram used to explain the operation of the apparatus shown in FIG. 1. In the diagram, 1...Room to be air conditioned, 2...Air conditioner, 3
... Precooling and preheating device, 4 ... Total heat exchanger, 6 ... Sensible heat exchanger, 7 ... Air supply fan, 9 ... Exhaust fan, 10 ... Heat pipe unit, 11, 12
...Filter, 14...Asbestos rotor, 18
...Partition plate, 21...Heat pipe.

Claims (1)

[Claims] 1. A heat pipe unit that is equipped with opposing air channels and pre-cools or preheats the outside air that is introduced through one of the air paths, a rotary total heat exchanger that dehumidifies or humidifies the outside air that is introduced from this heat pipe unit, and this rotary type It is equipped with a sensible heat exchanger that cools or heats the outside air introduced from the total heat exchanger, and an air conditioner that brings the air from the sensible heat exchanger to the required temperature and supplies it to the air conditioned room. In the indoor air conditioner, the air passes through the other air path of the heat pipe unit and then is exhausted through the rotary total heat exchanger.