JPH0257835A - Cooling and heating apparatus - Google Patents

Abstract

PURPOSE:To reduce the pipe size, to save the power, and to prevent the damages caused by water leakage by providing a liquid receiver, an indoor condenser for heat-exchanging with room air, and a heat source condenser for heat-exchanging with an external heat source, and by circulating fluorocarbon refrigerant by a liquid pump. CONSTITUTION:In cooling operation, a cooling cycle is carried out as follows: Liquid freon refrigerant L is sent by a liquid pump 2 from a receiver 1 to a room evaporator 3 in which refrigerant is evaporated, and air in a room is cooled. Gas refrigerant G is sent to a condenser 4 to liquefy it by an external cold-heat source Hc, and returned to the liquid receiver 1. In heating operation, a heating cycle is carried out as follows: Liquid refrigerant L is sent by the liquid pump 2 from the liquid receiver 1 to the evaporator 4 in which the liquid refrigerant is evaporated by heat from an external heat source Hh. Then, gas refrigerant G is liquefied in the room condenser 3 and air in the room is heated. Liquid refrigerant L is returned to the liquid receiver 1. Thus, as fluorocarbon refrigerant is employed and its latent heat is used, the amount of refrigerant to be transferred can be reduced causing the power saving, and damages caused by water leakage can be diminished.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heating and cooling system for both summer and winter use, which uses a fluorocarbon-based refrigerant as a heat medium fluid.

(Conventional technology) In recent years, from the perspective of social development and pollution prevention, district heat source facilities (DHC) have been developed.
gCooling Plant) is attached to a group of large buildings to provide cooling.

Increasingly, heating sources are supplied to individual buildings.

For example, there is a configuration as shown in Figure 4.
During cooling, cold water W is supplied from the refrigerator R through the cold water inlet pipe Yw and the outflow pipe Y having a cold water pump Pw and a switching valve v1.
is sent to the heat exchanger X of the air conditioner AHU, passes from the heat exchanger

Also, during heating, steam S or hot water is sent from the boiler B to the heat exchanger The heating cycle is carried out through the pipe S and back to the boiler B through the hot water return pipe having the switching valve v4.

Through these cycles, the indoor air A that has been heat exchanged by the heat exchanger X is circulated by the fan F through the air supply duct Ds and the exhaust duct De, and is cooled or heated to air-condition the room C. That is, cold water is used as the cold source, and catfish steam or hot water is used as the hot source.

(Problems to be Solved by the Invention) In the field of air conditioning for buildings, conventional heating and cooling equipment has been used as a heat transfer means for air conditioning in response to intelligent buildings, office automation, and computerization. Bringing water into buildings is a problem.

This is because the damage caused by water leakage accidents has increased dramatically with the introduction of office automation and computers. When water is limited to the air conditioner room and air conditioning is performed by wind using ducts, a large amount of air space is required in the ceiling, which increases construction costs and makes it impossible to cope with the increase in load density on the room side. was also observed. In addition, similar problems with water leakage, duct space, and machine room air space still remain in centralized heating and cooling heat source facilities.

The present invention has been made in view of the above-mentioned circumstances, and it not only reduces piping size and saves power, but also eliminates the risk of water leakage and is suitable for use as a DHC heat source and can be used for both heating and cooling purposes. The purpose is to provide

Means for Solving Problem C] The air conditioning system according to the present invention includes a condenser/evaporator that exchanges heat with a cooling/heating heat source, a liquid receiving tank, and at least one indoor evaporator/condenser. In addition, necessary piping and switching valves for switching between cooling and heating are installed, and a fluorocarbon-based refrigerant is used as a heat transfer means and is circulated by a liquid pump.

(Function) In the air conditioning system of the present invention, during cooling, a fluorocarbon-based refrigerant liquid is sent from a liquid receiving tank to an indoor evaporator by a liquid pump and vaporized to cool indoor air, and the refrigerant gas is
A cooling cycle is performed in which the liquid is sent to the condenser, liquefied by a cold source from outside the device, and returned to the liquid receiving tank.

In addition, for heating, a liquid pump sends refrigerant liquid from the liquid receiving tank to an evaporator that receives a heat source from outside the device and vaporizes it, and this refrigerant gas is liquefied in an indoor condenser to warm the indoor air. , a heating cycle is performed in which the refrigerant liquid is returned to the liquid receiving tank. That is, air conditioning is performed using a fluorocarbon-based refrigerant gas as a room cooling and heat source and a fluorocarbon-based refrigerant liquid as a room heat source.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, I will explain the configuration.

In FIG. 1 showing the schematic configuration of this embodiment, 1 is a liquid receiving tank for a fluorocarbon-based refrigerant liquid, 2 is a liquid pump that sends the refrigerant liquid from the lower part of the tank 1, and 3 is a respective chamber C. The indoor evaporator/condenser (hereinafter referred to as “Indoor Evaporator 12i!!
4 is a heat source condenser and evaporator (hereinafter referred to as a "heat source dehumidifier" ).

The piping system includes a pouring liquid pipe 5 having a liquid pump 2 and a switching valve 5v from the lower part of the liquid receiving tank 1, and a reciprocating liquid main pipe 6 connected to the pouring liquid pipe 5 and guided to each chamber C. A reciprocating liquid branch pipe 7 equipped with an electromagnetic control valve 7v that branches from the main pipe 6 and connects to the room steamer 3; a reciprocating gas main pipe 9 guided from the heat source steamer 4 to each room C; A reciprocating gas branch pipe 8 branches from the main pipe 9 and connects to the indoor steam condenser 3, and a heat source terminal steamer 4 branches from between the liquid pump 2 and the switching valve 5 of the injection liquid pipe 5.
The outflow liquid branch pipe lO equipped with a switching valve 10V connects to the liquid receiving tank! A heating reflux liquid pipe 11 equipped with a switching valve 11v connected to the upper part, and a switching valve 12v equipped to connect the heat source steamer 4 and the upper part of the liquid receiving tank 1 by sharing a part of the reflux liquid pipe 11. and a cooling reflux liquid pipe 12.

Note that the flow rate of the liquid pump 2 is controlled by a liquid level sensor 13s attached to the liquid level gauge 13 of the liquid receiving tank 1, and the electromagnetic control valve 7v is operated by a temperature sensor 14s in the chamber C to keep the volume 1tillJIl. The pressure sensor 10s attached to the reciprocating gas main pipe 9 controls the flow rate by the electromagnetic control valve 15v provided in the heat source inflow pipe 15 from the outside to prevent condensation or vaporization of the heat medium in the heat source steamer 4. Control.

Next, the operation will be described with reference to FIGS. 2 and 3.

With the configuration described above, when cooling the air conditioner according to this embodiment, the cold heat source H is connected to the heat source inflow pipe 15.
a, open the switching valves 5v and 12V, and turn on the switching valve 10v.
, llv are closed as shown in black. Therefore, the liquid pump 2 is started and the refrigerant liquid is poured into the liquid pipe 5 from the liquid receiving tank 1.
- When the reciprocating liquid main pipe 6 - the reciprocating liquid branch pipe 7 are sent to the indoor steam condenser 3 through the route indicated by the thick solid line, this operates as an evaporator and vaporizes the refrigerant liquid, e.g. indoor air at 25°C. A
Cool to 15°C. The vaporized refrigerant gas G is sent to the heat source condenser 4 through a path indicated by a double line between the reciprocating gas branch pipe 8 and the reciprocating gas main pipe 9, where it is cooled by the cold heat source Hc and liquefied. This refrigerant liquid passes through a part of the reciprocating liquid branch pipe 10 and returns to the liquid receiving tank 1 via the cooling reflux liquid pipe 12, completing the cooling cycle, and this cycle is repeated. At this time, liquid pump 2. The electromagnetic control valve 7v and the electromagnetic control valve 15v each perform required control.

On the other hand, for heating, the heat source Hh is supplied to the heat source inflow pipe 15, the switching valves 10v and 11v are opened, and the switching valves 5v and 12v are closed. Therefore, the liquid pump 2 is started to flow the refrigerant liquid from the liquid receiving tank 1 to the injecting liquid pipe 5 to the outgoing liquid branch pipe 1.
It is sent to the heat source condenser 4 via route 0, heated by a heat source, and vaporized. This refrigerant gas G flows through the reciprocating gas main pipe 9-
The gas is sent to the indoor steam condenser 3 through the reciprocating gas branch pipe 8, and is cooled by room air A at, for example, 25°C, condenses and liquefies, and heats the indoor air A to 35°C. The liquefied refrigerant liquid returns to the liquid receiving tank 1 through the route of the reciprocating liquid branch pipe 7, the reciprocating liquid main pipe 6, and the heating reflux liquid pipe 11 to complete the heating cycle.

That is, in this embodiment, a fluorocarbon-based refrigerant is used as a heat transfer means to enable both cooling and heating.

〔Effect of the invention〕

As explained above, according to the present invention, a liquid receiving tank, an indoor steam condenser that exchanges heat with indoor air, and a heat source condenser that exchanges heat with an external heat source are provided, and a liquid pump , instead of conventional water as a heat transport means, a fluorocarbon-based refrigerant that uses latent heat is circulated, which reduces the amount of refrigerant transported, reducing power and making it possible to reduce the size of piping. Not only that, but the installation space is also saved.

Furthermore, by using a room temperature gaseous refrigerant, there is no risk of water leakage, such as wetting indoor machines.

Furthermore, since a compressor is not required even when refrigerant is used, repairs and maintenance are extremely easy.

In addition, conventional liquid pump systems can only perform cooling, but the present invention has a reversible cycle, so it can be used for both cooling and heating. It is also suitable for use as a DHC heat source, and furthermore, it is possible to control load imbalance within the same room.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the air conditioning system according to the present invention, FIG. 2 is an explanatory diagram of a cooling cycle, FIG. 3 is an explanatory diagram of a heating cycle, and FIG. 4 is an explanatory diagram of a heating cycle. FIG. 1 is a schematic configuration diagram of a conventional heating and cooling device. 1...Liquid receiving tank 2...Liquid pump 3...Room evaporator/condenser 4...Heat source condenser/evaporator 5v, 10v , 11v, 12v...Switching valve L
...Freon-based refrigerant liquid G...Freon-based refrigerant gas

Claims (1)

[Claims] A liquid receiving tank, a condenser/evaporator that exchanges heat with external cooling and heat sources, at least one indoor evaporator/condenser that exchanges heat with indoor air, and necessary piping and heating/cooling switching. 1. An air-conditioning and heating system characterized by comprising a valve and a liquid pump that performs a heat cycle using these valves, and using a fluorocarbon-based refrigerant as a heat transport means.