JPH0554923U - Outside air treatment unit - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an outside air treatment unit including an air conditioner outside air conditioner, and an object thereof is to prevent freezing by supplying a refrigerant to a cooling and heating coil. [Structure] An air conditioner external conditioner having an outside air introduction port, a cooling and heating coil and a fan disposed inside, and a duct attached to the outlet of the fan, a heat exchanger in communication with a source of cold and hot water, and this heat exchanger. The pipe was connected to the cold / hot water unit and filled with a refrigerant, and a pump and a valve mounted in parallel on one side of the pipe. Further, the heat exchanger, the piping, the pump and the valve may be provided together with the air conditioner external conditioner.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an outside air processing unit including an air conditioner outside air conditioner.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, as an outside air processing unit including an air conditioner outside air conditioner, for example, one shown in FIG. 4 is known.

In FIG. 4, reference numeral 1 denotes an air conditioner external air conditioner. The air conditioner external air conditioner 1 is provided with an external air introduction port 2, and a filter 3, a cooling and heating coil 4, a humidifier 5 and a fan 6 are provided inside. A duct 8 is attached to the air outlet 7 of the fan 6 so that cold air or warm air can be sent.

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

According to this outside air treatment 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 cooled / heated by the coil 4 for heating / cooling. Send to. On the other hand, the outside air flows through the outside air introduction port 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 and, after having a proper amount of moisture added by the humidifier 5, is discharged to the duct 8 by the fan 6 through the outlet 7.

Further, in the case of the cooling operation, the valves 11 and 13 are opened and the valves 10 and 12 are closed, so that 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 introduction port 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 and heating coil 4, and then discharged by the fan 6 to the duct 8 through the blowout port 7.

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

[0008]

[Problems to be solved by the device]

 However, in such a conventional outside air processing unit, for example, in a cold region, when heating operation is performed, if the air conditioner is stopped at night, hot water remains in the cooling / heating coil 4, so that When the warm water is cooled by the outside air and the outside air becomes 0 ° C. or less, it is frozen and the cooling / heating coil 4 may expand and burst.

Therefore, conventionally, the following two countermeasures have been mainly taken as measures for preventing freezing. (1) An electric heater is provided near the cooling and heating coil 4. (2) The hot water supply to the cooling / heating coil 4 is not stopped, and the circulation is continued.

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

[0011]

[Means for Solving the Problems]

 According to a first 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 conditioning external air conditioner in which a duct is attached to an outlet of the fan; It is composed of a pipe connecting the heat exchanger and the cooling and heating coil and filled with a refrigerant therein, and a pump and a valve 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 a duct is installed at a fan outlet, and an air conditioning external air conditioner, and a heat exchanger that communicates with a cold / hot water source. And a pipe that connects the heat exchanger 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, the heat exchanger, the pipe, A pump and a valve are installed together with the air conditioner external conditioner.

[0013]

[Action]

 In claims 1 and 2, when the hot water supplied from the cold / hot water source is supplied to the heat exchanger during the heating operation, the refrigerant in the pipe is gasified and flows into the cooling / heating coil, and flows from the outside air introduction port. The warmed outside air is heated by exchanging heat with the outside air, and the warmed 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 removed. It liquefies and flows toward the heat exchanger. However, since the temperature at which the refrigerant freezes is minus several tens of degrees Celsius, 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 and is sent to the cooling / heating coil by the pump and flowed in from the outside air inlet. It cools by exchanging heat with the outside air, 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]

【Example】

 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, reference numeral 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.

The pipes 28 and 30 are attached to the cooling and heating coil 23. These pipes 28 and 39 communicate 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. Then, 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 chlorofluorocarbon gas (for example, R-22 or the like) is used.

A three-way switching valve 36 is provided in each of the pipes 34 and 35. 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 through the pipe 34, the refrigerant in the pipe 28 is gasified and the heating / cooling coil is heated. It flows into 23.

Then, in the air conditioner external air conditioner 20, the outside air introduced from the outside air introduction port 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 is discharged to the duct 27 from the blow-out port 26 by the fan 25 after the humidifier 24 adds an appropriate amount of moisture. On the other hand, the refrigerant that has exchanged heat with the outside air in the heating / cooling coil 23 is liquefied, flows down in the pipe 30, and returns to the heat exchanger 33 again.

The heating operation is maintained by repeating this cycle. During this heating operation, the valve 31 of the pipe 30 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 sudden temperature change, a part of the gasified refrigerant is liquefied and flows down toward the heat exchanger 33. 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 heating / cooling coil 23, when the gasified refrigerant in the inside is exhausted, there is no object to be frozen, so that there is no possibility that the coil will be damaged. 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 is pumped by the pump 32. It is sent to the cold / hot water coil 23.

Then, in the air conditioner external air conditioner 20, after the outside air flowing in from the outside air introduction port 21 is cleaned by the filter 22, it can be sent to the cooling / heating coil 23. 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 the cold region, when the heating operation is performed, even if the air conditioner is stopped at night, the cooling and heating coil 23 and the pipes 28 and 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 freezing can be reliably prevented compared to the conventional method using hot water.

Further, since the refrigerant, which is a means for transporting heat energy for cooling and heating, exerts an antifreezing function, compared to the conventional antifreezing measures such as installation of an electric heater and 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. The case 40 is installed side by side with the air conditioner external conditioner 20 in FIG. 1.

In the present 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 it is a special place. It is possible to easily provide the antifreezing device without requiring

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 described as being installed side by side with the air conditioning external air conditioner 20, but a partition is provided inside the air conditioning external air conditioner 20 and the heat exchanger 33 is provided therein. The pipes 28, 30, the valve 31, and the pump 32 may be provided.

[0034]

As described above, according to claims 1 and 2, since the refrigerant is passed through the cooling and heating coil, for example, when the temperature of the outside air changes suddenly or at night, the air conditioner is operated. Even when it is stopped, it does not freeze up to minus several tens of degrees Celsius where the refrigerant freezes, and it is possible to reliably prevent freezing compared to the conventional method using hot water.

Further, since the refrigerant, which is a means for transporting heat energy for cooling and heating, exerts an antifreezing function, there is no need for maintenance compared to the conventional antifreezing measures, and it is simple, reliable, and reliable. It is economical.

[Brief description of drawings]

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

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

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

FIG. 4 is a configuration explanatory view 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 conditioner external air conditioner having an outside air introduction port, a cooling and heating coil and a fan arranged inside, and a duct attached to the outlet of the fan, a heat exchanger in communication with a cold / hot 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 in communication with a source of cold and hot water, and this heat exchange. And a pipe that connects the air conditioner and the cooling and heating coil and is filled with a refrigerant inside, and a pump and a valve that are 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, which is installed together with an air conditioner outside air conditioner.