JP2000039203A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner without mixture loss of energy. SOLUTION: In the air conditioner 20 comprising an atmosphere intake port 11, an inlet 16 for return air from a room, a heat exchanging coil 7 for regulating a temperature of the air, a humidifier 8 and a blower 1, heat exchanging coils 22, 23 are respectively provided in the port 11 and the inlet 16, and communicate with one another to constitute a heating medium circulating route C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner suitable for factories and the like that require cooling throughout the year.

[0002]

2. Description of the Related Art In cooling in winter, as shown in FIG. Be guided. On the other hand, the indoor return air B is directly introduced from the indoor air inlet 5 into the mixing chamber 6, and the mixing chamber 6
Is mixed with the outside air A. The mixed air is supplied to the cooling coil 7
, The temperature is adjusted to an appropriate temperature, adjusted to an appropriate humidity by the humidifier 8, and further guided to the room through the filter 9.

The preheater 4 functions to prevent freezing of the water in the cooling coil 7 and the rupture of the pipe due to the freezing. The preheater 4 functions when the temperature of the outside air A becomes 5 ° C. or less. It is controlled not to be below. In the air conditioner, the mixing chamber 6 is provided before the cooling coil 7 for the purpose of adjusting the temperature by mixing the outside air A and the indoor return air B. However, a large space is required for complete mixing in the mixing chamber 6. Is necessary, and it is often difficult to secure sufficient space to achieve sufficient function. In addition, an air diffusion plate (not shown) may be provided in the mixing chamber 6, but its use is limited because the ventilation resistance increases. Therefore, at present, installation of the preheater 4 is inevitable.

[0004]

When the preheater 4 is mounted downstream of the outside air inlet 2, the outside air A to be taken in is heated by the outside air inlet 2, and the heated air is cooled by the cooling coil 7. Cooling again, resulting in a significant energy loss. The present invention has been made in view of such circumstances, and an object of the present invention is to provide an air conditioner that solves the above-described disadvantages of the related art and has no energy mixing loss.

[0005]

In order to achieve the above object, the present invention provides an air conditioner according to claim 1 of the present invention, wherein an outside air intake, an intake of return air from a room, and temperature and humidity of the air are provided. In the air conditioner including a heat exchange coil, a humidifier, and a blower, a heat exchange coil is provided downstream of the outside air intake and the intake of return air from the room, and the coils are provided. The heat medium circulation path is constituted by communicating with each other by the communication pipe.

That is, the air conditioner of the present invention focuses on using a heat pipe formed by connecting two heat exchange coils to each other as a method of mixing the heat of the return air from the room and the cool heat of the outside air. A heat exchange coil is provided at the intake and the intake of return air from the room, and a communication pipe through which the heat medium flows is attached between the two coils, thereby forming a circulation path of the heat medium.

The heat medium in the circulation path undergoes a phase change from gas to liquid in the coil on the outside air side to generate heat and heats the outside air, and conversely, a phase change from liquid to gas occurs in the coil on the air side. To absorb the heat and cool the return air. The temperature of the heating medium is approximately the arithmetic average of the temperature of the outside air and the return air, and the temperature of both coil surfaces is also kept almost uniform at the temperature of the heating medium.
The temperature is efficiently and quickly mixed. By doing so, processing without mixing loss is enabled.

In the air conditioner according to a second aspect of the present invention, in the first aspect, a bypass pipe is provided in the heat medium circulation path, a heat exchanger is interposed in the bypass pipe, and the bypass pipe is provided. Opening / closing valves are installed at the entrance and exit of the road. In the air conditioner of the present invention, by opening the on-off valve in the summer, both the outside air side coil and the return air side coil function for cooling, and therefore, particularly the return air can be cooled.

Further, in the air conditioner according to claim 3 of the present invention,
In claim 2, the return water of the cooling coil is guided as the refrigerant of the heat exchanger. In the air conditioner of the present invention, the return water of the cooling coil used in the air conditioner can be used as the refrigerant, which is reasonable.

[0010]

1 shows a clean room to which an air conditioner of the present invention is applied, FIG. 2 shows an embodiment of an air conditioner according to the present invention, and FIG. 3 shows a heat exchanger assembly. . In the clean room 10 shown in FIG.
Is taken in from the outside air inlet 11, the temperature and humidity are adjusted by the air conditioner 20, guided indoors through the air supply duct 12, purified by the fan filter unit 13, and guided into the clean room 10. The air in the clean room 10 is guided from the grating floor 14 through the exhaust duct 15 to the return air intake 16, and the return air B merges with the outside air A taken in from the outside air intake 11, and returns to the clean room 10.
Supplied to Thus, the temperature in the clean room 10 is maintained at about 23 ° C. and the humidity is about 45%.

As shown in FIG. 2, the air conditioner 20 has a heat exchanger assembly 21 disposed between the outside air intake 11 and the return air intake 16. In this heat exchanger assembly 21, an outside air coil 22 and a room return air coil 23 are arranged corresponding to the outside air intake 11 and the return air intake 16, and the outside air coil 22 and the room return air coil 23 , As shown in FIG.
To form a heat medium circulation path C. In the air conditioner 20, the other elements are as follows.
Since it is the same as the conventional air conditioner shown in FIG. 5, the same reference numerals are given and the description is omitted.

The outside air taken into the air conditioner 20 enters through the outside air intake 11 and passes through the filter 3 to the outside air coil 22.
And introduced into the mixing chamber 6. The room return air enters from the return air inlet 16 and is introduced into the mixing chamber 6 through the room return air coil 23. At that time, in the winter, as shown in FIG. 3A, the heat medium in the pipe (circulation path C) is the outside air coil 2.
In step 2, the phase changes from gas to liquid to generate heat, thereby heating the outside air A. The heat medium that has become liquid is sent to the indoor return air coil 23 through the communication pipe 25. In the indoor return air coil 23, the heat medium changes its phase from liquid to gas, absorbs heat, and cools the return air B.

In this embodiment, HFC (hydrofluorocarbon) 134 which does not destroy ozone is used as a heat medium.
a is used. These two coils 22 and 23 are installed at the same height, and the heat medium naturally circulates as a driving force the difference in density between the liquid and the gas and the difference in temperature between the outside air A and the return air B to transfer heat. Is going. This function is used when the temperature of the return air B is higher than the outside air. In this example, the return air B was 23 ° C. In summer, Figure 3
As shown in the example of the summer in (b), the flow is reversed, and the cooling and heating functions are also reversed. Also at this time, the temperature is mixed, which contributes to the improvement of the cooling capacity of the cooling coil 7 at the subsequent stage.

In another embodiment shown in FIG.
In summer, the two coils 22 and 23 enable pre-cooling of the outside air A and the return air B. In this air conditioner, the pipe of the heat medium is connected to the bypass pipe 29 of the heat exchanger 28 via the opening and closing valves 26 and 27, and the return chilled water of the cooling coil 7 is connected to the heat exchanger 28 via the opening and closing valve 30. Has been led. And, in the summer, the opening and closing valve 26,
27 and the opening / closing valve 30 are opened. Then, the heat medium of each coil 22, 23 of the heat exchanger assembly 21 is:
Cooled through the bypass line 29. Therefore, not only the outside air A but also the return air B can be cooled.
In winter, the valves 26, 27, and 30 may be closed.

[0015]

As described above, in the air conditioner according to the first aspect of the present invention, particularly in the winter season, the heat medium in the circulation path is phase-changed from gas to liquid by the coil on the outside air to generate heat. The outside air is heated, and conversely, the coil on the return air side changes phase from liquid to gas to absorb heat and cool the return air. Accordingly, it is possible to prevent heat mixing loss occurring between the pre-heater and the cooling coil in the air conditioner, which is observed during the cooling and warming in winter, and to achieve energy-saving air conditioning.

In the air conditioner according to the second aspect of the present invention, both the outside air side coil and the return air side coil function for cooling by opening the open / close valve in summer. The return air can be cooled. Furthermore, in the air conditioner according to claim 3 of the present invention,
This is reasonable because the return water of the cooling coil used in the air conditioner can be used as the refrigerant.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a clean room provided with an air conditioner according to the present invention.

FIG. 2 is a configuration diagram showing an embodiment of an air conditioner according to the present invention.

FIG. 3 is a cross-sectional view showing the functions of a coil of an air conditioner according to the present invention in winter and summer.

FIG. 4 is a configuration diagram showing another embodiment of the air conditioner according to the present invention.

FIG. 5 is a configuration diagram showing a conventional air conditioner.

[Explanation of symbols]

 Reference Signs List 20 air conditioner 21 heat exchanger assembly 22 outdoor air coil 23 indoor return air coil 24, 25 communication pipe 26, 27 open / close valve 28 heat exchanger 29 bypass line 30 open / close valve

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Kato, Inventor Hitachi Plant Construction Co., Ltd. 1-1-1 Uchikanda, Chiyoda-ku, Tokyo

Claims (3)

[Claims] 1. An air conditioner comprising an outside air intake, an intake of return air from a room, a heat exchange coil for adjusting the temperature and humidity of the air, a humidifier, and a blower, wherein the outside air intake and the air An air conditioner comprising heat exchange coils provided downstream of an inlet for return air from a room, and the coils being connected to each other by a communication pipe to form a heat medium circulation path. 2. A method according to claim 1, wherein a bypass pipe is provided in the heat medium circulation path, and a heat exchanger is formed in the bypass pipe.
The air conditioner according to claim 1, wherein an opening / closing valve is provided at an inlet and an outlet of the bypass pipe. 3. The air conditioner according to claim 2, wherein return water of a cooling coil is introduced as a refrigerant of the heat exchanger.