JPH07151359A - Refrigerant circulation type air conditioning system - Google Patents

Abstract

PURPOSE:To simplify a system structure by gathering heat exchangers to one unit, commonly using a conveying tube for supplying refrigerant liquid as for returning the liquid, and commonly using a pump for returning the liquid at the time of heating as for forcibly circulating refrigerant at the time of heating. CONSTITUTION:A heat exchanger 1 is commonly used for both cooling and heating. A conveying tube 3 for supplying refrigerant liquid is commonly used for a conveying tube 4 for returning the liquid. At the time of cooling, a pump 5 is commonly used for the pump 5 for forcibly supplying liquefied refrigerant liquid to a fan coil unit 2. At the time of cooling, the liquid in the exchanger 1 is naturally circulated to the unit 2 by an operation of gravity and a pressure of vaporized refrigerant gas or forcibly circulated by the pump 5 to be used for returning liquefied refrigerant liquid to the exchanger 1 at the time of heating. Thus, rooms are cooled. At the time of heating, the liquefied liquid is returned to the exchanger 1 by utilizing the tube 3 for supplying the refrigerant at the time of cooling. In this manner, a system structure can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of heat transfer means in a refrigerant circulation type air conditioning system.

[0002]

2. Description of the Related Art Conventionally, there has been a refrigerant circulation type air conditioning system which uses an absorption type refrigerator to cool and heat by utilizing the phase change of the refrigerant. In the conventional system, as shown in FIG. It has two heat exchangers, a heat exchanger for cooling (condenser) and a heat exchanger for heating (evaporator), and is designed to perform heating and cooling by switching the flow of refrigerant with a valve. , The refrigerant gas vaporized in the fan coil unit during cooling is returned to the heat exchanger (condenser) for cooling, and the refrigerant gas vaporized in the heat exchanger (evaporator) for heating during heating is supplied to the fan coil unit. A common conveying pipe is used, and a conveying pipe that supplies the refrigerant liquid to the fan coil unit during cooling, a conveying pipe that returns the refrigerant liquid liquefied by the fan coil unit to the evaporator during heating, and a pump for that are required.

During cooling, if there is a sufficient difference between the installation position of the absorption refrigerator and the installation position of the lower fan coil unit, the action of gravity on the refrigerant liquid liquefied by the heat exchanger (condenser) for cooling. Since it can be naturally circulated to each fan coil unit by the pressure of the vaporized refrigerant gas, it does not require a transfer power, but in the case of a fan coil unit installed in the room on the top floor of the building, the drop is small, Since the refrigerant liquid may not smoothly circulate naturally,
A pump for forced circulation of the refrigerant was required.

That is, in the conventional system, the carrier pipes for supplying and returning the refrigerant gas are common, and three carrier pipes for supplying the refrigerant liquid and for returning the refrigerant liquid are required. Not only is the structure complicated, but in addition to the pump for returning the refrigerant liquid liquefied by the fan coil unit to the evaporator during heating, a pump for forced circulation of the refrigerant during cooling is required, and equipment costs including piping construction costs are required. Had the drawback of being expensive.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention combines two conventional heat exchangers so that a carrier pipe for supplying a refrigerant liquid can be commonly used for returning a refrigerant liquid. (EN) Provided is a refrigerant circulation type air conditioning system in which piping is omitted, and a pump for returning a refrigerant liquid during heating can be shared for forced circulation of a refrigerant during cooling so that the system configuration can be simplified. That is the purpose.

[0006]

DISCLOSURE OF THE INVENTION In a refrigerant circulation type air conditioning system according to the present invention, a heat exchanger is installed in an upper position of a building, and a refrigerant is provided between the heat exchanger and a fan coil unit installed in each room in the building. A closed circuit in which the refrigerant circulates is connected by a transfer pipe to cool each room by naturally circulating the refrigerant liquid in the heat exchanger to the fan coil unit by the action of gravity and the pressure of the vaporized refrigerant gas during cooling. However, in the refrigerant circulation type air conditioning system provided with a pump for returning the liquefied refrigerant liquid to the heat exchanger during heating, the heat exchanger is a common heat exchanger for cooling and heating, and the carrier pipe for supplying the refrigerant liquid is the refrigerant liquid. It is characterized in that it is also used as a return transfer pipe and is also used as a pump for forcibly supplying the liquefied refrigerant liquid to the fan coil unit during cooling. .

[0007]

The refrigerant liquid in the heat exchanger is naturally circulated in the fan coil unit during cooling by the action of gravity and the pressure of the vaporized refrigerant gas, or used for returning the liquefied refrigerant liquid to the heat exchanger during heating. The respective pumps are forcedly circulated to cool each room, and the liquefied refrigerant liquid is returned to the heat exchanger at the time of heating using the carrier pipe for supplying the refrigerant liquid at the time of cooling.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the system of the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the system of the present invention, in which 1 is a heat exchanger installed in a machine room on the roof of a building, to which cold water is supplied during cooling and hot water is supplied during heating, and an internal heat exchange coil The refrigerant passing through (not shown) is cooled or heated. 2 ... 2 is a fan coil unit installed in each room, 3 is a heat exchanger for cooling 1
Refrigerant liquefied by being cooled by each fan coil unit 2
The carrier pipes 4 for supplying to the heat exchanger of 1 return the vaporized refrigerant gas to the heat exchanger 1 after passing through the heat exchanger of each fan coil unit 2 during cooling, and are heated by the heat exchanger 1 during heating. The carrier pipes 5 for supplying the vaporized refrigerant gas to each fan coil unit 2 return the liquefied refrigerant liquid that has passed through the heat exchanger of each fan coil unit 2 to the heat exchanger 1 during heating. The pumps 6, 7, 8, 9 are valves that alternately open and close during cooling and heating to control the flow of the refrigerant. In the figure, 11 is a liquid level sensor installed on the side surface of the heat exchanger 1, and controls the pump 5 so that the refrigerant liquid accumulated in the heat exchanger during heating becomes constant. Reference numeral 21 is a solenoid valve that is automatically closed when the operation of each fan coil unit is stopped to shut off the supply of the refrigerant to the heat exchanger. The heat exchanger may be replaced with an evaporator or a condenser of an absorption refrigerator.

In the case of cooling by natural circulation of the refrigerant, when the valves 6 and 8 are opened and the valves 7 and 9 are closed to operate the fan coil unit, the refrigerant liquid cooled and liquefied by the heat exchanger 1 is opened. It is sent to the transfer pipe 3 through the valves 6 and 8 that are operating, passes through the heat exchanger of the fan coil unit 2 that is operating by passing through the transfer pipe 3 in the direction of the solid line arrow, and is vaporized by heat exchange at that time. A natural circulation cycle is formed in which the refrigerant gas passes through the carrier pipe 4 in the direction of the solid line arrow and returns to the heat exchanger 1, where it is liquefied again and supplied to the fan coil unit through the carrier pipe 3 to form a natural circulation cycle. Is cooled.

In the case of cooling by forced circulation of the refrigerant, when the valves 6 and 9 are opened and the valves 7 and 8 are closed and the pump 5 is driven to operate the fan coil unit, the refrigerant liquid is opened. It is sent to the carrier pipe 3 through 6 and 9, and the refrigerant liquid is forcibly supplied to the heat exchanger of the fan coil unit 2 which is also operating, and the room in operation is cooled.

When heating, the valves 6 and 9 are closed, the valves 7 and 8 are opened, the pump 5 is driven to operate the fan coil unit, and the refrigerant gas heated and vaporized by the heat exchanger 1 is The refrigerant liquid which has passed through the heat exchanger of the fan coil unit 2 operating through the carrier pipe 4 in the direction of the dotted arrow passes through the valves 8 and 7 which are opened by the pump 5. To the heat exchanger 1 through the carrier pipe 3 in the direction of the dotted line arrow, and is vaporized there again to be supplied to the fan coil unit through the carrier pipe 4, and the room in operation is Be heated.

[0012]

According to the refrigerant circulation type air-conditioning system of the present invention, the two heat exchangers that have been conventionally used are combined into one, and the carrier pipe for supplying the refrigerant liquid can be commonly used for returning the refrigerant liquid. By omitting the piping, it became possible to use two of the three carrier tubes that were previously required to carry the refrigerant, and the difference between the installation position of the absorption refrigerator and the installation position of the lower fan coil unit was reduced. Even if it is small, the pump for returning the refrigerant liquid at the time of heating can be shared for the forced circulation of the refrigerant at the time of cooling, so that the system configuration can be simplified by omitting unnecessary pipes and pumps. In addition, the equipment cost including piping construction cost can be made extremely low as compared with the conventional system.

This system is not limited to the case where the room on the top floor of the building in which the difference between the installation position of the absorption refrigerator and the installation position of the lower fan coil unit is small is air-conditioned, and the natural circulation of the refrigerant is possible. It can also be applied to the air conditioning of rooms on different floors.The natural circulation stop phenomenon of the refrigerant liquid due to the flushing phenomenon that occurs when the operation is restarted by forcibly circulating the refrigerant liquid for a certain time when the operation is restarted after the cooling operation is stopped. It can be resolved.

[Brief description of drawings]

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

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

[Explanation of symbols]

 1 heat exchanger 11 liquid level sensor 2 fan coil unit 21 solenoid valve 3 carrier pipe 4 carrier pipe 5 pump 6 valve 7 valve 8 valve 9 valve

Claims (1)

[Claims] 1. A heat exchanger is installed above a building, and the heat exchanger and a fan coil unit installed in each room in the building are connected by a refrigerant carrier pipe to circulate the refrigerant. A circuit is constructed to cool each room by naturally circulating the refrigerant liquid in the heat exchanger to the fan coil unit by the action of gravity and the pressure of the vaporized refrigerant gas during cooling, and heat exchange the liquefied refrigerant liquid during heating. In a refrigerant circulation type air conditioning system provided with a pump for returning to the container, the heat exchanger is used as a common heat exchanger for cooling and heating, and the carrier pipe for supplying the refrigerant liquid is shared with the carrier pipe for returning the refrigerant liquid. At the same time, at the time of cooling, the refrigerant circulation type air conditioning system is characterized in that it is shared by a pump for forcibly supplying the liquefied refrigerant liquid to the fan coil unit.