JPH0587365A - Open air processing air conditioner - Google Patents

Abstract

PURPOSE:To save energy under simple temperature control in terms of an air conditioner designed for open air treatment. CONSTITUTION:A cold/hot water coil 14, a direct expansion coil 16 and a fan 18 are housed in a casing 12, thereby forming an outlined air conditioning system. An open air intake duct 20 is incorporated into the casing 12 while an air supply duct 22 is connected to the fan 18 as well. The cold/hot water coil 14 is laid out on the front flow side with an open air flow direction X while the direct expansion coil 16 is laid out on the rear flow side. The cold/hot water coil 14 circulates a medium by way of a first intake pipeline 26 and a first drain pipeline 28. The first drain pipeline 28 is communicated with a compressor 24 of the direct expansion coil 16 and uses the cold/hot water which has passed through the cold/hot water coil 14 as cooling water for the compressor 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for treating outside air, and more particularly to an outside air treating air conditioner using cold water or hot water as an air conditioning medium.

[0002]

2. Description of the Related Art As a conventional outside air treatment type air conditioner, for example, as shown in FIG. 2, a cooling coil 1 having cold water as a medium and a heating coil 2 having warm water as a medium are provided in a passage X of outside air. In general, there are those arranged in series. And in this outside air processing air conditioner, the cooling coil 1
And cold water and hot water are made to respectively flow through the heating coil 2 to control the temperature of the outside air passing through these coils 1 and 2,
This is supplied to the room through the fan 3.

[0003]

However, in such a conventional outside air processing air conditioner, it is necessary to determine the chilled water temperature according to the condition of air supply, that is, the amount of air blown by the fan 3, and if necessary. The temperature must be controlled by reheating with the heating coil 2. Therefore, there are problems that the conditions for controlling the temperature become extremely difficult, the air conditioning plan as the system becomes difficult, and energy loss occurs.

In view of the conventional problems, it is therefore an object of the present invention to provide an outside air processing air conditioner capable of saving energy while easily controlling temperature.

[0005]

To achieve the above object, the present invention introduces cold / hot water coil for introducing cold water or hot water, and cold / hot water after passing through the cold / hot water coil as cooling water for a compressor. The direct expansion coil and the direct expansion coil are arranged in series with respect to the passage of the outside air.

[0006]

In the outdoor air treatment air conditioner of the present invention having the above-described configuration, the cold / hot water coil and the direct expansion coil are arranged in series, so that the temperature-controlled outdoor air passing through the cold / hot water coil is directly expanded. The temperature will be controlled again by the coil, and two-stage cooling will be possible. Therefore, the cooling water supplied at the time of cooling can be set higher by this two-stage cooling,
Energy can be omitted. Further, since the two-stage cooling is used, the heat recovered by the cold / hot water coil can be effectively utilized and reheated, so that the temperature control is not required, that is, two types of heat sources are not required. It can be done easily.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of an outside air processing air conditioner 10 according to the present invention, which is configured by housing a cold / hot water coil 14, a direct expansion coil 16 and a fan 18 in a casing 12. An outside air introduction duct 20 is drawn into the casing 12, and an air supply duct 22 is connected to the fan 18. The outside air is introduced into the casing 12 from the introduction duct 20 in accordance with the operation of the fan 18, flows through the casing 12 in the X direction, and is conditioned while passing through the cold / hot water coil 14 and the direct expansion coil 16. It This conditioned air is supplied to the room through the air supply duct 22.

The cold / hot water coil 14 is arranged on the upstream side with respect to the outside air passage direction X, and the direct expansion coil 16 is arranged on the downstream side. The cold / hot water coil 14 is configured as a heat exchanger by arranging the air-conditioning medium flow pipes in a meandering manner and attaching fins to the surface thereof. The medium passes through the flow pipes and the outside air passing between the fins. Heat is exchanged between. On the other hand, the direct expansion coil 16 is similarly configured as a heat exchanger, and the compressor 24 is provided on the upstream side of the flow pipe through which the medium passes.

A first medium introduction pipe 26 and a first medium discharge pipe 28 are connected to the cold / hot water coil 14, and the first medium introduction pipe 2
The medium of cold water or hot water introduced via 6 circulates through the cold / hot water 1 coil 14 and is discharged from the first discharge pipe 28. On the other hand, the first discharge pipe 28 is connected to the second introduction pipe 30 communicating with the compressor 24 of the direct expansion coil 16, and the three-way electric switching valve 32 is provided on the downstream side of the connection portion C. The second discharge pipe 34 of the compressor 24 is connected to the three-way electric switching valve 32. And the above 3
By switching the one-way switching valve 32, the medium can be supplied to the compressor 24 as cooling water after passing through the cold / hot water coil 14.

In the outside air processing air conditioner 10 of the present embodiment having the above-mentioned configuration, the direct expansion coil 1 is provided on the downstream side of the cold / hot water coil 14 with respect to the flow direction X of the outside air in the casing 12.
6 are arranged in series, and the cold / hot water that has passed through the cold / hot water coil 14 is used as the cooling water for the compressor 24 of the direct expansion coil 16. The direct expansion coil 16 allows the refrigerant compressed by the compressor 24 to inflow and expand, and adiabatic expansion at this time can reduce the temperature.

Therefore, in this embodiment, the outside air processing air conditioner 10 is used.
However, since the cold / hot water coil 14 and the direct expansion coil 16 can perform two-stage cooling, the cooling effect can be greatly increased. Therefore, the cold water supplied to the first introduction pipe 26 can be set higher than in the conventional case, and energy saving can be achieved. In addition, since the cold water temperature of a specific unit can be set high in this way, depending on the cold water temperature conditions of other units, one type of cold water temperature (10
Since the refrigeration cycle of the system can be planned at about -15 ° C), the refrigerator COP (coefficient of performance) can be improved.

In the case of reheating during cooling, the heat recovered by the cold / hot water coil 14 can be effectively utilized for reheating, so that a heat source is not particularly required, and from this point, the temperature Control can be performed easily.

Further, for heating in the winter season, hot water is supplied to the cold / hot water coil 14 for heating, and the hot water temperature as this medium can be set to a low temperature. As a result, the coil side pressure loss on the air side can be suppressed to save the air carrying power of the fan 18, and energy can be saved from this point as well.

Furthermore, since the difference in use temperature when the cold / hot water coil 14 is operated is large except when heat is recovered, this also contributes to energy saving.

[0015]

As described above, in the outside air processing air conditioner of the present invention, the cold / hot water coil and the direct expansion coil are arranged in series with respect to the passage path of the outside air. Since it is possible to set the cold water supplied at the time of cooling to be high, energy saving can be achieved.

By using the cold / hot water that has passed through the cold / hot water coil as cooling water for the compressor of the direct expansion coil,
Since the heat recovered by the cold / hot water coil can be effectively used to reheat the heat source, no heat source is required, that is, two kinds of heat sources are not required, and therefore temperature control can be easily performed.

Further, at the time of heating in winter, a low temperature of hot water is sufficient, the pressure loss on the air side coil accompanying this can be reduced to save the air carrying power, and the temperature difference between the cold and hot water coils is increased except when heat is recovered. As a result, various excellent effects such as further energy saving can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an outside air processing air conditioner according to the present invention.

FIG. 2 is a schematic configuration diagram of a conventional outside air processing air conditioner.

[Explanation of symbols]

10 Outdoor Air Treatment Air Conditioner 14 Cold / Hot Water Coil 16 Direct Expansion Coil 18 Fan 24 Compressor

Claims (1)

[Claims] 1. A cold / hot water coil for introducing cold water or hot water, and a direct expansion coil for introducing cold / hot water after passing through the cold / hot water coil as cooling water for a compressor are connected in series with respect to a passage path of outside air. An outside air processing air conditioner characterized by being placed.