JPS6213945A - Cooling and heating device - Google Patents

Abstract

PURPOSE:To make a device compact by a method wherein a non-operated facility during a replacing between the cooling and the heating operation is reduced, and a power facility such as a cold-water tower fan and the cooling water pump or the like is decreased. CONSTITUTION:A thermal accumulation tank 1 is assembled with a load heat exchanger 8, a condensor 14 using a heat pump and a nozzle 7. A third bypass pipe 44 includes change-over valves 34 and 38 at its both ends and includes an air-cooled heat exchanger 1 in the midway thereof. A second circulation passage 46 is assembled with a load heat exchanger 8 fan coil unit 12, change- over valves 31 and 32 and a cold and hot water pump 11. Facility for the cold- water tower and the cooling pump or the like can be unnecessitated, the entire device is made compact as the device itself is simplified and the non-operated facility is made few by replacing the cooling operation with the heating operation.

Description

[Detailed description of the invention] 〔Technical field〕 TECHNICAL FIELD The present invention relates to a heating and cooling device.

[Prior art]

2. Description of the Related Art Air-conditioning and heating devices are known that switch circuits when switching from cooling to heating or from heating to cooling.

For example, in a certain air conditioning system, as shown in FIG. The cold water for cooling circulates through a circuit formed by the nozzles 7 provided, and the heat exchanger 8 built into the heat storage tank 1, the fan coil unit 12, and the cold/hot water pump 1.
The cooling water is circulated through a circuit constituted by a cooling water pump 9, a condenser 4, and a cooling tower 10.

On the other hand, during heating, as shown in FIG. 4, refrigerant circulates through a circuit comprised of a suction drum 2, a compressor 3, a condenser 4, a refrigerant storage tank 5, an expansion valve 6, and an air-cooled evaporator 13.

Cooling water (brine) is supplied to the heat storage tank 1, pump 9, condenser 4, heat storage tank 11 pump 11 fan coil unit 12.
, and the heat storage tank 1.

In addition, when switching from cooling to heating, the switching valves 20 to 2
Of the 8, switching valves 20.21, 22゜23, 24.25
and 26.

However, when switching between heating and cooling systems, there are many idle facilities such as cooling towers, many power facilities such as cooling tower fans and cooling water pumps, and the overall size of the equipment. There are drawbacks.

(Objective of the Invention) The present invention solves the above-mentioned drawbacks, and aims to reduce idle equipment when switching between heating and cooling, reduce power equipment such as cooling tower fans and cooling water pumps, and further, The purpose is to make the device more compact overall.

[Structure of the invention]

That is, the air conditioning apparatus of the present invention includes an M heat tank incorporating a load heat exchanger and a condenser, a compressor that compresses refrigerant gas, and an air-cooled heat exchanger that condenses or evaporates refrigerant gas. It is characterized by comprising a refrigerant storage tank that stores liquefied refrigerant, and a fan coil unit that cools or heats air with the liquid cooled or heated by the load heat exchanger.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 41 denotes a first circulation path, and in this 111i1 circulation path 41 there is an M heat tank 1 as a crystallizer, a switching valve 33, a suction drum 2, a refrigerant compressor 3, a switching valve 37, and 38, a second expansion valve 16, a switching valve 36, and a first expansion valve 6. The M heat tank 1 is a load heat exchanger 8
, a condenser 14 using a heat pump, and a nozzle 7
It incorporates.

Reference numeral 42 indicates a first bypass pipe, and this first bypass pipe 42 includes switching valves 33 and 36 at both ends, switching valves 34 and 35, and a refrigerant storage tank 5 in the middle thereof. Further, reference numeral 43 indicates a second high-speed pipe, and this second bypass pipe 43 includes switching valves 35 and 37 at both ends, and the condenser 14 in the middle thereof. Further, reference numeral 44 indicates a third bypass pipe, and this second bypass pipe 44 includes switching valves 34 and 38 at both ends, and the air-cooled heat exchanger 1 is connected to the air-cooled heat exchanger 1 in the middle thereof.
Contains 3.

On the other hand, reference numeral 46 indicates a second circulation path, and this first circulation path 4
The load heat exchanger 8, fan coil unit 12, switching valves 31, 32, and cold/hot water pump 11 are incorporated in the heat exchanger 6.

A first branch pipe 47 branched from the switching valve 31 communicates with the M heat tank l, and a second branch pipe 48 branched from the switching valve 32 communicates with the heat storage tank l. . Further, the third circulation path 49 including the pump 15 communicates with the M heat tank 1 at both ends thereof.

(1) As shown in Figure 1, the refrigerant is compressed by the compressor 3 to a saturated vapor pressure corresponding to the condensation temperature, and then sent to the air-cooled heat exchanger 13 where it is liquefied. .

After passing through the refrigerant storage tank 5, this condensate is depressurized at the first expansion valve 6 to a saturated vapor pressure corresponding to a temperature 1 to 2 degrees C lower than the freezing point of the brine, and is then passed from the lower part of the heat storage tank 1 through the nozzle 7 into the brine. is sprayed on.

The refrigerant liquid sprayed into the brine absorbs heat from the brine and evaporates, then passes through the suction drum 2 and reaches the compressor 3. The brine in the heat storage tank 1 loses heat to the vapor of the refrigerant liquid and its temperature drops, producing ice crystals in the brine. The ice crystals are stored in a heat storage tank l as a slurry with brine.

The brine preferably has a freezing point of -2 to -3°C, such as a 3 to 3.5% saline solution or a 5 to 10% ethylene glycol solution. In this case, even if inexpensive seawater is used, the problem of corrosion is not serious because the temperature is below room temperature.

The above operations are performed until the required amount of water is produced using electricity at night, and the following operations are performed during the day.

A load heat exchanger 8 is incorporated in the heat storage tank 1,
Cold water for cooling is sent to this load heat exchanger 8 by a cold/hot water pump 11. Then, heat is exchanged with the prine in the heat storage tank 1, and the temperature of the cooling water is lowered. After the cooling water whose temperature has been lowered undergoes heat exchange with cooling air in the fan coil unit 12, it is sent to the heat exchanger 8 again by the cold/hot water pump 11.

(2) 1 temperature ≦ 2 times . After passing through the refrigerant storage tank 5, the condensate is transferred to the second
The pressure is reduced to a predetermined saturated vapor pressure in the expansion valve 16, and then it is emitted in the air-cooled heat exchanger 13, and after being gasified, it passes through the suction drum 2 and reaches the compression v&3.

On the other hand, the plines in the heat storage tank 1 used to cool the refrigerant gas absorb heat from the refrigerant gas in the condenser 4 and raise the temperature, so the heat from the condensation of the refrigerant is transferred to the M heat tank 1. .

For the prine, use the one used for summer cooling, such as a 5-10% ethylene glycol solution, as is.

The above operations are performed using nighttime electricity until the necessary amount of heat is accumulated in the heat storage tank 1, and the following operations are performed during the day.

That is, hot water in the M heat tank 1 is supplied by the cold/hot water pump 11 to the fan coil unit 12, and after heat exchange with heating air is performed in the fan coil unit 12, it is returned to the heat storage tank 1.

When switching from cooling to heating start, all the switching valves 31 to 38 are switched, respectively.

〔Effect of the invention〕

As described above, the present invention provides a heat storage tank incorporating a load heat exchanger and a condenser, a compressor that compresses refrigerant gas, an air-cooled heat exchanger that condenses or evaporates refrigerant gas, and a liquefier. The present invention is comprised of a refrigerant storage tank that stores refrigerant, and a fan coil unit that cools or heats air with the liquid cooled or heated by the load heat exchanger, so it has the following advantages.

■ Equipment such as cooling water towers and cooling pumps is no longer required, and the overall equipment becomes more compact due to the simplification of the equipment itself.

■ Idle equipment will be reduced due to switching between air conditioning and heating.

■ Required power equipment can be reduced by eliminating the need for cooling tower fans, cooling water pumps, etc.

■Maintenance becomes easier as there is no need for cooling water.

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic diagrams of a heating and cooling device according to the present invention, and FIGS. 3 and 4 are schematic diagrams of the heating and cooling device before improvement. 1... N heat tank, 2... Suction drum, 3...
Compressor, 5... Refrigerant storage tank, 6... First expansion valve, 7.
...Nozzle, 8... Heat exchanger, 11... Cold/hot water pump, 12... Fan coil unit, 16... Second
Expansion valve, 31-38... Switching valve, 41... First circulation path, 42... First bypass pipe, 43... Second bypass pipe, 44... Third bypass pipe, 46... ...Second circulation path, 47...First branch pipe, 48...Second branch pipe, 4
9...Third circulation route.

Claims (1)

[Claims] A heat storage tank incorporating a load heat exchanger and a condenser, a compressor that compresses refrigerant gas, an air-cooled heat exchanger that condenses or evaporates refrigerant gas, and a refrigerant storage tank that stores liquefied refrigerant. A heating and cooling device comprising: a fan coil unit that cools or heats air with a liquid cooled or heated by the load heat exchanger.