JPH11281204A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise air conditioning efficiency and reduce the running cost, by providing an air conditioning system with a reheater for air conditioning downstream of the air of the evaporator of an air conditioner capable of cooling operation making use of ice heat accumulation, and equipping it with a normal independent power facility for drive of a prime mover, and making use of the waste heat to the heat source of the reheater. SOLUTION: This air conditioner 10 is one for cooling, for example, a computer room, and this is provided with a reheater 37 downstream of the air of an evaporator 35 of an indoor machine 11 so as to make the room temperature constant. The air being cooled once with the evaporator 35 is heated with the reheater 35, and is sent to a computer room after being air-conditioned to a roughly constant room. For the heat source of the reheater 37, the waste heat of the prime mover 42 of a normal independent power facility 3 is utilized. The prime mover 42 is supplied with cooling water by a pump 43, and it circulates through a cooling water heat exchanger 44. The waste heat recovered with the heat exchanger 44 flows in the reheater 37. By making use of the waste heat of the prime mover 42, a heater becomes needless for the reheater, and the power consumption can be sharply reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system having a reheater for controlling temperature downstream of an evaporator of an air conditioner on the air side.

[0002]

2. Description of the Related Art Generally, in a large computer room ("constant temperature room"), internal heat is generated from a computer, cooling is required throughout the year, and it is desired to keep the room temperature constant for the purpose of maintaining computer functions. There is a request. The conventional air conditioner used for air conditioning in this case is provided with a reheater such as an electric heater downstream of the evaporator on the air side, and heats the air once cooled by the evaporator with this reheater to be substantially constant. After the temperature is adjusted, it is blown to the computer room.

[0003]

However, in the conventional configuration, since the reheater is an electric heater, there is a problem that the power consumption is large and the running cost for air conditioning increases.

Accordingly, an object of the present invention is to provide an air conditioning system which solves the above-mentioned problems of the prior art and improves air conditioning efficiency and reduces running costs when air conditioning a constant temperature room such as a computer room. Is to do.

[0005]

According to the first aspect of the present invention,
An air conditioner that uses the ice stored in the ice heat storage tank to perform cooling operation using ice heat storage operation, a reheater provided downstream of the evaporator on the air side of the air conditioner, and a motor. And a private power generation facility driven by a power generator, wherein exhaust heat of a prime mover is used as a heat source of the reheater.

According to a second aspect of the present invention, there is provided the heat storage operation according to the first aspect, further comprising a commercial power supply and a regular private power generation equipment power supply, and switching the power supply according to a day mode, a night mode, and a power failure mode. And performing the cooling operation using the ice heat storage.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, this air conditioning system includes a commercial power supply 1 and a power supply 3 for a common private power generator (“cogeneration system”). Each power supply 1, 3 is connected to a lighting power cable via a plurality of switches 5. 7 and a power supply cable 9. The lighting power cable 7 is connected to a lighting device of a building where the air conditioning system is installed, and the power power cable 9 is connected to a driving source of an air conditioner described later.

Reference numeral 10 denotes an air conditioner. The air conditioner 10 includes an indoor unit 11, an outdoor unit 13, and an ice heat storage unit 1.
5 is provided. The ice heat storage unit 15 houses an ice heat storage tank 17, and ice is stored in the ice heat storage tank 17.

In the "heat storage operation" for storing ice in the ice heat storage tank 17, the compressor 22 housed in the outdoor unit 13 is driven. Then, the refrigerant from the compressor 22 is supplied to the condenser 23, the pipe 24, the on-off valve 25, and the pipe 2 as shown by solid arrows.
6. After flowing into the ice making coil 27 and exchanging heat with the ice making coil 27, the heat is returned to the compressor 23 through the pipe 28, the on-off valve 29, the pipe 30, and the accumulator 21. The refrigerant evaporates in the ice making coil 27, and ice is stored in the ice heat storage tank 27.

The ice stored in the ice heat storage tank 27 is used for cooling operation. In the “cooling operation using ice heat storage”, the refrigerant from the compressor 22 flows into the condenser 23, the pipe 24, the on-off valve 25, the pipe 26, and the ice making coil 27 as indicated by solid arrows. In this ice making coil 27, the refrigerant is subcooled by ice, and the supercooled refrigerant passes through a pipe 28,
As indicated by a dotted arrow, the gas flows into the branch pipe 28a, passes through the on-off valve 31, the on-off valve 25, further flows into the branch pipe 26a, and flows into the evaporator 35 via the on-off valve 32, the pipe 33, and the capillary tube 34. Pipe 36, accumulator 2
1 and is returned to the compressor 23. Since the refrigerant supercooled by the ice making coil 27 flows into the evaporator 35, the cooling efficiency of the present system is improved.

In this air conditioner 10, "normal cooling operation" is performed in addition to "cooling operation using ice heat storage". In this "normal cooling operation", the refrigerant from the compressor 22 flows into the condenser 23, the pipe 24, and the on-off valve 25 as shown by the solid line arrow, and then, flows through the ice making coil 27 as shown by the dotted line arrow. By-passing, it flows into the branch pipe 26a, flows into the evaporator 35 through the on-off valve 32, the pipe 33, and the capillary tube 34, and flows through the pipe 36, the accumulator 21 and the compressor 23.
Is returned to. According to this, since the ice making coil 27 is bypassed, the refrigerant is not supercooled, and the non-supercooled refrigerant flows into the evaporator 35, so that the normal cooling operation is performed.

In the above description, the on-off valves 25, 29, 31, 3 other than the on-off valves indicated for explaining the flow of the refrigerant.
2 shall be closed.

The air conditioner 10 cools a computer room (not shown). In the computer room, in order to maintain a constant room temperature, the air conditioner 10 is provided downstream of the evaporator 35 of the indoor unit 11 on the air side. Is provided with a reheater 37.

The air once cooled by the evaporator 35 is heated by the reheater 37 and adjusted to a substantially constant temperature.
It is sent to the computer room.

In this embodiment, the exhaust heat of the prime mover of the regular private power generator (“cogeneration system”) 3 is used as the heat source of the reheater 37.

In this regular private power generation facility 3, a generator 41 is provided.
Is driven by a prime mover (“engine”) 42, and cooling water is supplied to the prime mover 42 via a pump 43. The cooling water circulates through a cooling water heat exchanger 44, and a brine pipe 45 is connected to the cooling water heat exchanger 44. A brine pump 51 is connected to the brine pipe 45. The brine circulated by the brine pump 51 passes through the cooling water heat exchanger 44, and then flows into the exhaust gas heat exchanger 46 for recovering the exhaust gas heat of the prime mover 42. , Both heat exchangers 44,
At 46, the exhaust heat of the prime mover 42 is recovered. The brine heated by the exhaust heat recovery is connected to the pipe 47 and the branch pipe 47a.
Flows into the reheater 37 through the reheater 47,
After heating the cooled air through the evaporator 35, the brine pump 51 passes through a three-way valve 48, a pipe 49 and a three-way valve 50.
Is returned to.

Reference numeral 52 denotes a heat-radiating heat exchanger for lowering the temperature of the circulating brine when the temperature of the brine is too high.

In this embodiment, since the air conditioner 10 is provided with the ice heat storage unit 15, "cooling operation utilizing ice heat storage" can be performed, cooling efficiency can be improved, and the heat source of the reheater 37 can be improved. Since the exhaust heat of the prime mover 42 of the regular private power generation facility 3 is used, it is not necessary to use an electric heater for the reheater as in the related art, and the power consumption can be significantly reduced by these combinations.

Next, control of the air conditioning system will be described.

Referring to FIG. 2, in this air conditioning system, "day mode", "night mode", and "power failure mode" are set as operation modes.

The "day mode" is a daytime period (for example, 8 am
Hour to 10:00 pm) and the "night mode"
Is an operation mode in a night time zone (for example, from 10:00 pm to 8:00 in the next morning), and "power failure mode" is an operation mode at the time of power failure. In the “daytime mode”, the commercial power supply 1 and the commercial power generation facility power supply 3 are used together, and the “heat storage operation” for storing ice in the ice heat storage unit 15 is not performed. In the “night mode”, only the commercial power supply 1 is used, and only the “heat storage operation” using the commercial power supply 1 is performed. In the "power failure mode", the daytime zone and the nighttime zone are distinguished. In each case, only the private power generator power supply 3 is used. In the nighttime, only the private power generator power supply 3 is used. Only the "heat storage operation" is performed.

In a large computer room ("constant temperature room"), there is internal heat generation from the computer, which requires cooling throughout the year, and furthermore, there is a demand to keep the room temperature constant to maintain the function of the computer.

In the present embodiment, the operation modes are classified into "day mode", "night mode", and "power failure mode", and the commercial power supply 1 and the private power generator power supply 3 are appropriately switched according to the distinction. This makes it possible to keep the indoor temperature constant while leveling the power consumption throughout the year regardless of whether it is at night or during a power outage.

In FIG. 2, a column for "for general air conditioning" is provided. The "for general air conditioning" includes an air conditioner (not shown) other than the air conditioner 10 or an absorption refrigeration system. And air conditioners that use air conditioners.

Although the present invention has been described based on one embodiment, it is apparent that the present invention is not limited to this. For example, the circuit system in FIG. 1 is an example, and the present invention is not limited to the circuit system. The present invention is applicable to all air conditioning systems using a reheater.

[0027]

According to the present invention, the "cooling operation utilizing ice heat storage" can be performed, the cooling efficiency can be improved, and the exhaust heat of the prime mover of the private power generation facility is used as the heat source of the reheater. Therefore, it is not necessary to use an electric heater for the reheater as in the related art, and the power consumption can be significantly reduced by these combinations.

In the present invention, the operation modes are classified into "day mode", "night mode", and "power failure mode", and the commercial power supply and the private power generator power supply are appropriately switched according to the distinction. It is possible to maintain a constant indoor temperature while leveling power consumption throughout the year, regardless of whether it is a night or a power outage.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an operation mode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Commercial power supply 3 Regular private power generation equipment ("cogeneration system") 9 Power supply cable 10 Air conditioner 11 Indoor unit 13 Outdoor unit 15 Ice storage unit 17 Ice storage tank 35 Evaporator 37 Reheater 41 Generator 42 Motor ( "Engine") 44 Cooling water heat exchanger 46 Exhaust gas heat exchanger

Claims (2)

[Claims] 1. An air conditioner that enables cooling operation utilizing ice heat storage using ice stored in an ice heat storage tank by a heat storage operation, and a reconditioner provided downstream of an evaporator of the air conditioner on the air side. An air conditioning system, comprising: a heat generator; and a commercial power generator driven by a prime mover, wherein exhaust heat of the prime mover is used as a heat source of the reheater. 2. A power supply comprising a commercial power supply and a regular private power generation equipment power supply, wherein the power supply is switched according to a day mode, a night mode, and a power failure mode to perform the heat storage operation and the ice storage cooling operation. The air conditioning system according to claim 1.