JP3321275B2 - External air cooling combined air conditioning system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in heat transfer means in an air conditioning system combined with outside air cooling.

[0002]

2. Description of the Related Art Conventionally, as a system for air-conditioning a computer room or the like that requires cooling not only in the summer but also in the winter, there is an air-conditioning system using outside air which cools by utilizing outdoor cold heat. In a conventional system of this type, as shown in FIG. 2, a cold source such as a refrigerator and an outdoor unit that takes in the cold from the outside are installed, and a refrigerant (usually water) from the cold source and a gas from the liquid from the outdoor unit are used. The two types of refrigerants, which change in phase, are selectively supplied to a heat exchange coil of an indoor air conditioner installed in the room to be air-conditioned to cool the room to be air-conditioned.

[0003]

Problems with the prior art However, in the above prior art, since two kinds of refrigerants are used, two heat exchange coils of the indoor air conditioner are required, respectively. Not only the air resistance is large, that is, the pressure loss inside the machine is large and the fan power must be large.In addition, two transfer pipes for circulating the refrigerant to each heat exchange coil are also required. However, there is a problem that the system configuration is complicated, and equipment costs and other running costs are high.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses two kinds of refrigerants conventionally used as one kind of refrigerant and uses one heat exchange coil of an indoor air conditioner for forced cooling and outside air. It is an object of the present invention to provide an air-conditioning system combined with outside air and cooling, which can be shared for cooling and omits piping, thereby simplifying the system configuration.

[0005]

DISCLOSURE OF THE INVENTION The outside air cooling combined air conditioning system according to the present invention is configured as follows. The outdoor unit incorporating cold source and outdoor cold placed above the position of the building, to be air-conditioned room
The indoor heat exchange coil of the installed indoor air conditioner and the above room
Take the cold heat of the outdoor heat exchange coil of the outdoor unit and the above cold heat source.
The heat exchange coil for the cold heat source of the heat exchanger for the cold heat source
Are connected in series and circularly in this order,
The refrigerant that changes phase into liquid and gas naturally flows into the heat exchange coil.
Circulate and bypass the above outdoor heat exchange coil
Switching means for circulating the refrigerant is provided,
By switching the stages, the above-mentioned cooling
At the time of cooling control, the above refrigerant is combined with the above indoor heat exchange coil.
Circulate with the heat exchange coil for cold heat source mentioned above,
Therefore, during the outdoor air cooling by the outdoor unit,
The indoor heat exchange coil described above and the outdoor heat exchange coil described above
So as to circulate in order with the above heat exchange coil for cold heat source
Configured.

[0006]

SUMMARY OF THE INVENTION During forced cooling, the cooled refrigerant passing through the heat exchange coil cold heat source heat exchanger for a cold heat source cold source,
This refrigerant is naturally circulated through the indoor heat exchange coil of the indoor air conditioner by the action of gravity of the liquefied refrigerant liquid and the pressure of the vaporized refrigerant gas, thereby cooling the air-conditioned room . to this
Against it, at the time of outdoor air cooling, heat exchange carp for a refrigerant to cool passing through the outdoor heat exchanger coil above the cold heat source of the outdoor unit
The indoor heat exchanger coil of the indoor air conditioner through le, to cool the object to be air-conditioned room by also natural circulation. Outside of the above
During air cooling, the outdoor unit
If the cooling power of the
Supply cold heat to the source heat exchanger. Then, the outdoor unit of the outdoor unit
The refrigerant cooled by passing through the heat exchange coil
While passing through the heat exchange coil for the cold source of the heat exchanger for the heat source
It is further cooled and supplied to the indoor heat exchange coil.
As a result, the temperature of the room to be air-conditioned rises due to fluctuations in the outside air temperature.
Can be prevented.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic configuration diagram of the system of the present invention. 1 is a cold source such as a refrigerator installed in a machine room on the roof of a building, and 2 is cold water (primary refrigerant) from a cold source 1.
A heat source heat exchanger 3 for cooling the refrigerant passing through an internal cold heat source heat exchange coil (not shown) is an outdoor unit also installed on the roof of a building, and an internal outdoor heat exchange coil. Cools the refrigerant passing through (not shown). 4 is
The indoor air conditioner 5 having the indoor heat exchange coil 41 and the fan 42 provided therein is a heat source for the cold heat source 2 of the heat source 2 for the cold heat source.
Conveying pipe for liquid supplying refrigerant liquid which is liquefied by passing through the coil or the outdoor heat exchanger coil of the outdoor unit 3 to the indoor air conditioner 4 inside of the indoor heat exchanger coil 41, 6, heat exchange coil chamber conveying pipe for the gas to return the refrigerant gas vaporized by passing through the 41 to the outdoor <br/> heat exchanger coil of the cold heat source heat exchanger coil or the outdoor unit 3 of the cold heat source heat exchanger 2, 7, 8, 9 is a first to third valves for controlling the flow of the refrigerant, and 10 is a liquid
Is a pressure gauge for measuring the pressure in the transfer pipe 5 for use .

[0008] Then, as shown in FIG.
The indoor heat exchange coil 41 of the indoor air conditioner 4 and the outdoor
Outdoor heat exchange coil of the unit 3 and the above heat exchanger for cold heat source
And the heat exchange coil for the cold heat source are connected in series in this order.
They are connected in a circular fashion. Outdoor heat exchange of the above outdoor unit 3
The cooling coil is bypassed to convert the refrigerant to the indoor heat.
For the exchange coil 41 and the cold heat source of the above heat exchanger 2 for the cold heat source
The switching means circulated to the heat exchange coil is, in this case,
The first to third valves 7, 8.9 are provided. What
The third valve 9 may be kept open,
May be omitted.

In the case of forced cooling, the first valve 7 is opened.
In addition, the second valve 8 and the third valve 9 are closed to drive the cold heat source 1 to supply the cold water as the primary refrigerant to the cold heat source heat exchanger 2, and the cold heat source heat exchanger 2 The refrigerant liquid cooled and liquefied when passing through the heat exchange coil for the cold heat source passes through the indoor heat exchange coil 41 of the indoor air conditioner 4 through the liquid transfer pipe 5, and at that time , heat exchange occurs. The vaporized refrigerant gas passes through the gas conveying pipe 6 and passes through the heat exchanger 2 for the cold heat source.
Return to the heat exchange coil for cold heat source , where it is liquefied again
Through the liquid transfer pipe 5, the indoor heat exchanger of the indoor air conditioner 4
A natural circulation cycle supplied to the oil 41 is formed, and the room to be air-conditioned is cooled.

When cooling the outside air, the first valve 7 is closed.
And the second valve 8 and the third valve 9 are opened,
When the outdoor unit 3 is driven, the outdoor unit 3
The refrigerant liquid cooled and liquefied by heat exchange with the outside air in the
Passed through a heat exchanger coil for cooling heat of the cold heat source heat exchanger 2,
The refrigerant gas passes through the indoor heat exchange coil 41 of the indoor air conditioner 4 through the liquid transfer pipe 5, and at this time, the refrigerant gas vaporized by the heat exchange passes through the gas transfer pipe 6 and the outdoor heat of the outdoor unit 3. Exchange
Returning to the coil , the air-conditioned room is cooled by the natural circulation cycle of the refrigerant similarly to the above.

In the case of cooling the outside air, if the cooling power is insufficient, the pressure of the refrigerant gas increases.
Monitoring at 0 and automatically driving the cold heat source 1 to supply cold heat can prevent the temperature of the room to be air-conditioned from rising due to fluctuations in the outside air temperature, and keep the pressure constant. , The cooling operation using only the sensible heat of the refrigerant becomes possible.

[0012]

According to the air conditioning system combined with outside air cooling according to the present invention, two kinds of refrigerants conventionally used are changed to one kind of refrigerant which changes from a liquid phase to a gaseous phase, and one indoor air conditioner is used. Since the indoor heat exchange coil can be shared for forced cooling and outside air cooling, it is possible to reduce the number of transport pipes individually required for conventional forced cooling and outside air cooling, By omitting wasteful piping, the system configuration can be simplified, and equipment costs including piping construction costs can be made extremely low as compared with the conventional system. The conventional system also required two indoor heat exchange coils,
Since good by one of the indoor heat exchanger coil, cabin pressure loss is small, the fan power is also be small, also, or cold source
Also , the power required to supply the primary refrigerant such as cold water to the heat exchanger for the cold heat source is smaller than the power required to supply the indoor air conditioner as in the conventional system, so running costs can be reduced. You can do it.

[0013] Further, the present invention has the following effects. Room
During outdoor air cooling by an external unit,
Therefore, if the cooling power of the outdoor unit is insufficient,
It is sufficient to supply the cold heat to the heat exchanger for the cold heat source by moving the heat exchanger. Do
And cooled through the outdoor heat exchange coil of the outdoor unit
The refrigerant is a heat exchange coil for a cold heat source of the above heat exchanger for a cold heat source.
Is cooled further while passing through the indoor heat exchange coil.
Supplied to the This allows the outside air temperature to be
It is possible to prevent an increase in the temperature of the room to be air-conditioned due to the fluctuation.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of the system of the present invention.

FIG. 2 is a schematic explanatory diagram of a conventional system.

[Description of Signs ] 1 ... Cold heat source (refrigerator), 2 ... Heat exchanger for cold heat source, 3 ... Outdoor
Machine, 4 ... indoor air conditioner, 7.8.9, switching means (valve),
41 ... indoor heat exchange coil .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 5/00 F25B 1/00 399 F28D 15/02 101 F28D 15/02 105

Claims (1)

(57) [Claims] 1. An indoor heat exchange coil of an indoor air conditioner installed in a room to be air-conditioned , wherein a cold heat source and an outdoor unit for taking in outdoor cold heat are installed above the building.
And the outdoor heat exchange coil of the outdoor unit and the cold heat
Heat source heat exchanger for cold source heat exchanger to take in cold source heat
Exchange coils in series in this order and in a circular fashion.
Phase change in these heat exchange coils into liquid and gas.
Circulates the refrigerant naturally , bypasses the outdoor heat exchange coil, and
Switching means for circulating the oil and switching the switching means
By operating, during the forced cooling by the above-mentioned cooling source
Is the above-mentioned refrigerant and the above-mentioned indoor heat exchange coil and the above-mentioned cold heat.
With the heat exchange coil for the source,
At the time of outdoor air cooling by an outdoor unit, the above refrigerant is used for the indoor
Heat exchange coil and above outdoor heat exchange coil and above cold
Configured to circulate in order with the source heat exchange coil,
An air conditioning system combined with outside air cooling characterized by the following.