JPH0752492Y2 - Outside air processing unit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air processing unit having an air conditioner outside air conditioner.

[0002]

2. Description of the Related Art Conventionally, as an outside air processing unit having an air conditioner outside air conditioner, for example, one shown in FIG. 4 is known.

In FIG. 4, reference numeral 1 is an air conditioner external air conditioner. The air conditioner external air conditioner 1 is provided with an external air inlet 2, and a filter 3, a heating / cooling coil 4, a humidifier 5 and a fan 6 are provided inside. Further, a duct 8 is attached to the outlet 7 of the fan 6,
Cold or warm air is delivered.

A pipe 9 is attached to the cooling / heating coil 4. A cold / hot water source (not shown) communicates with the pipe 9. In addition, the pipe 9 has a valve 10,
11, 12, 13 and a switching valve 14 are provided.

According to this outside air processing unit, in the heating operation, the valves 10 and 12 are opened and the valves 11 and 13 are closed so that the hot water sent from the cold / hot water source is sent to the cooling / heating coil 4. . On the other hand, the outside air flows through the outside air inlet 2, passes through the filter 3, and is supplied to the cooling / heating coil 4. Therefore, the cleaned outside air is warmed by the cooling / heating coil 4, further added with an appropriate amount of moisture by the humidifier 5, and then discharged by the fan 6 to the duct 8 through the blowout port 7.

Further, in the case of cooling operation, the valves 11 and 1 are
3, the valves 10 and 12 are closed and the cold water sent from the cold / hot water source is sent to the cooling / heating coil 4.
On the other hand, the outside air flows through the outside air inlet 2, passes through the filter 3, and is supplied to the cooling / heating coil 4. Therefore,
The cleaned outside air is cooled by the cooling / heating coil 4, and then discharged to the duct 8 by the fan 6 through the outlet 7.

The switching valve 11 can be appropriately switched according to set conditions.

[0008]

However, in such a conventional outside air processing unit, when the air conditioner is stopped at night during heating operation in a cold region, hot water is generated in the cooling and heating coil 4. Since this hot water is still stored, it is cooled by the outside air, and when the outside air falls below 0 ° C,
There was a risk that the coil 4 for freezing and expansion would expand and burst.

Therefore, conventionally, the following two measures have been mainly taken as measures for preventing freezing. (1) Cooling / heating coil 4
An electric heater is provided in the vicinity of. (2) Cooling / heating coil 4
Continue to circulate without stopping hot water supply to.

However, in these conventional antifreezing measures, maintenance is troublesome and uneconomical. The present invention has been made to solve such conventional problems, and an object thereof is to provide an outside air processing unit capable of preventing freezing by supplying a refrigerant to a cooling and heating coil. Especially.

[0011]

According to a first aspect of the present invention, an outside air conditioner having an outside air introduction port, a cooling and heating coil and a fan disposed therein, and a duct installed at the outlet port of the fan is connected to a cold water source. A heat exchanger, a pipe that connects the heat exchanger and the cooling / heating coil and is filled with a refrigerant therein, and a pump and a valve that are mounted in parallel on one side of the pipe. .

According to a second aspect of the present invention, there is provided an outside air introduction port, an air conditioning coil and a fan are provided therein, and an air conditioner external conditioner in which a duct is attached to a blowout port of the fan, and a heat exchanger which communicates with a cold / hot water source, A pipe that connects the heat exchanger and the cooling and heating coil and is filled with a refrigerant, and a pump and a valve that are attached in parallel to one side of the pipe are provided, and the heat exchanger, the pipe, the pump, and A valve is provided together with the air conditioner external conditioner.

[0013]

According to the first and second aspects, during the heating operation,
When the hot water supplied from the cold / hot water source was supplied to the heat exchanger, the refrigerant in the pipe was gasified and flowed into the cooling / heating coil, and was warmed by exchanging heat with the outside air flowing in from the outside air inlet. The outside air is discharged to the duct by the fan, and the liquefied refrigerant flows down in the pipe and returns to the heat exchanger again. Heating operation is maintained by repeating this cycle.

When the heating operation is stopped, the gasified refrigerant remains in the cooling and heating coils and piping, and when the outside air drops due to a rapid temperature change, part of the gasified refrigerant is liquefied. And flow down to the heat exchanger. However, the temperature at which the refrigerant freezes is minus several tens of degrees Celsius.
Therefore, the refrigerant does not freeze.

On the other hand, during the cooling operation, when the cold water supplied from the cold / hot water source is supplied to the heat exchanger, the refrigerant in the pipe is liquefied, sent to the cooling / heating coil by the pump, and flowed in from the outside air inlet. The heat exchanges with the outside air to cool it, and the cooled outside air is discharged to the duct by the fan, and the gasified refrigerant flows down in the pipe and returns to the heat exchanger again. By repeating this cycle, the cooling operation is maintained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the outside air processing unit according to claim 1.

In the figure, 20 is an air conditioner external air conditioner. The air conditioner external conditioner 20 is provided with an external air introduction port 21, and a filter 22, a cooling / heating coil 23, a humidifier 24, and a fan 25 are provided inside. A duct 27 is attached to the air outlet 26 of the fan 25 so that cold air or warm air can be sent.

In the cooling / heating coil 23, the pipe 2
8 and 30 are attached. These pipes 28,3
9 communicates with a heat exchanger 33 that communicates with a cold / hot water source (not shown).

A valve 29 is attached to the pipe 28. The pipe 30 is provided with a valve 31 and a pump 32 in parallel. A refrigerant is filled in the refrigerant circulation system including the cooling and heating coil 23, the pipes 28 and 30, and the heat exchanger 33. As the refrigerant, for example, a CFC-based gas (for example, R-22 or the like) is used.

The three-way switching valve 3 is connected to the pipes 34 and 35.
6 is provided. Next, the operation of this embodiment thus configured will be described. First, during the heating operation, as shown in FIG. 1, when the hot water supplied from the cold / hot water source is supplied to the heat exchanger 33 via the pipe 34, the refrigerant in the pipe 28 is gasified to the cooling / heating coil 23. Inflow.

In the air conditioner external air conditioner 20, the outside air introduced from the outside air inlet 21 can be cleaned by the filter 22 and then sent to the cooling / heating coil 23. Therefore, the cleaned outside air is heat-exchanged and warmed by passing through the cooling / heating coil 23.

The warmed outside air, after having a proper amount of moisture added by the humidifier 24, is discharged from the outlet 26 to the duct 27 by the fan 25. On the other hand, the refrigerant that has exchanged heat with the outside air in the cooling / heating coil 23 is liquefied, flows down in the pipe 30, and returns to the heat exchanger 33 again.

By repeating this cycle, the heating operation is maintained. During this heating operation, the pipe 3
The valve 31 of 0 is open and the pump 32 is stopped.

When the heating operation is stopped, the gasified refrigerant remains in the cooling and heating coil 23 and the pipes 28 and 30. Therefore, even if the cooling / heating coil 23 is cooled by the outside air, it is hardly affected because the freezing temperature of the refrigerant is minus several tens of degrees Celsius.

When the outside air drops due to a rapid temperature change, a part of the gasified refrigerant is liquefied and the heat exchanger 3
Run down in 3 directions. Since the heat exchanger 33 is installed indoors, there is no fear that the refrigerant will freeze in the heat exchanger 33.

Further, in the cooling / heating coil 23, when the gasified refrigerant inside is exhausted, there is no object to be frozen, so there is no possibility of damage to the coil. On the other hand, during the cooling operation, as shown in FIG. 2, when the cold water supplied from the cold / hot water source is supplied to the heat exchanger 33 via the pipe 34, the refrigerant in the pipe 30 is liquefied and the pump 32 cools / hot water. Is sent to the coil 23.

In the air conditioner external air conditioner 20, the outside air introduced from the outside air inlet 21 can be sent to the cooling / heating coil 23 after being cleaned by the filter 22. Therefore, the cleaned outside air is heat-exchanged and cooled by passing through the cooling / heating coil 23.

The cooled outside air is discharged from the outlet 26 to the duct 27 by the fan 25. By repeating this cycle, the cooling operation is maintained.

During the cooling operation, the valve 31 is closed and the humidifier 24 is not used. As described above, according to the present embodiment, for example, in a cold region, when heating operation is performed, even if the air conditioner is stopped at night, the cooling / heating coil 23 and the pipes 28, 30 are gasified. Since the refrigerant remains stagnant, there is no risk of freezing up to minus several tens of degrees Celsius where the refrigerant freezes, and the freezing can be reliably prevented as compared with the conventional method using hot water.

Moreover, since the refrigerant, which is a means for conveying the thermal energy of cooling and heating, exerts the antifreezing function, compared with the conventional antifreezing measures such as the provision of an electric heater and the continuous circulation of hot water, It is simple, reliable and economical without the need for maintenance. FIG. 3 shows an embodiment of the outside air processing unit according to claim 2.

In the figure, 40 indicates a case. A heat exchanger 33, pipes 28, 30, a valve 31, and a pump 32 are arranged in the case 40. This case 4
0 is installed together with the air conditioner external conditioner 20 in FIG.

In this embodiment, the case 40 in which the heat exchanger 33, the pipes 28, 30, the valve 31 and the pump 32 are arranged is installed side by side with the air conditioner external conditioner 20, so that a special place is provided. The anti-freezing device can be easily provided without the need.

Also in this embodiment, it is possible to obtain the same effects as those of the above embodiment. In the embodiment shown in FIG. 3, the case 40 is provided side by side with the air conditioning external air conditioner 20, but a partition is provided inside the air conditioning air conditioner 20 and the heat exchanger 33, Piping 28,3
0, the valve 31 and the pump 32 may be provided.

[0034]

As described above, according to the first and second aspects, the refrigerant is passed through the cooling and heating coil.
For example, even when there is a sudden temperature change in the outside air or when the air conditioner is stopped at night, the refrigerant does not freeze to minus several tens of degrees Celsius, which is higher than the conventional method using hot water. Freezing can be reliably prevented.

Further, since the refrigerant, which is a means for conveying the heat energy of cooling and heating, exerts the antifreezing function, there is no need for maintenance as compared with the conventional antifreezing measures, and it is simple, reliable and economical. Is.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of an outside air processing unit according to claim 1.

FIG. 2 is an explanatory diagram of a configuration of an outside air processing unit according to claim 1.

FIG. 3 is a configuration explanatory view of an outside air processing unit according to claim 2;

FIG. 4 is a diagram illustrating a configuration of a conventional outside air processing unit.

[Explanation of symbols]

 20 Air Conditioning External Air Conditioner 21 Outside Air Inlet 23 Cooling / Heating Coil 25 Fan 26 Outlet 27 Duct 28, 30, 34, 35 Piping 31 Valve 32 Pump 33 Heat Exchanger

Claims (2)

[Scope of utility model registration request] 1. An air conditioning external air conditioner having an outside air introduction port, an internal heating and cooling coil and a fan, and a duct at the outlet of the fan, a heat exchanger for communicating with a hot and cold water source, and this heat exchange. An outside air treatment unit comprising: a pipe that connects a container and the cooling and heating coil and is filled with a refrigerant therein; and a pump and a valve that are mounted in parallel on one side of the pipe. 2. An outside air conditioner for air conditioning, which has an outside air inlet and is provided with a cooling and heating coil and a fan inside, and a duct is attached to the outlet of the fan, a heat exchanger for communicating with a cold / hot water source, and this heat exchange. And a pipe in which the inside of the pipe is connected with the cooling and heating coil and is filled with a refrigerant, and a pump and a valve mounted in parallel on one side of the pipe, and the heat exchanger, the pipe, the pump and the valve are An outside air processing unit that is installed together with an air conditioner outside air conditioner.