JPH07145964A - Refrigerant circulating type air conditioner system - Google Patents

Abstract

PURPOSE:To simplify system structure by using a heat exchanger as a heat exchanger common for cooling and heating, and commonly using a conveying tube for supplying refrigerant liquid with a conveying tube for returning the liquid. CONSTITUTION:In the case of cooling, when a valve 6 is opened, a valve 7 is closed and a fan coil unit 2 is operated, refrigerant liquid cooled and liquefied by a heat exchanger 1 is passed through a conveying tube 3 and a heat exchanger of the unit 2. In this case, refrigerant gas vaporized by heat exchanging is returned to the exchanger 1 through a conveying tube 4, and again liquefied to be supplied to the unit 2 through the tube 3 to form a natural circulating cycle. In the case of heating, when the valve 6 is closed, the valve 7 is opened and a pump 5 is driven to operate the unit 2, refrigerant gas vaporized by the exchanger 1 is passed through the tube 4 and the unit 2. In this case, refrigerant liquid liquefied by heat exchanging is returned to the exchanger 1 through the tube 3 by the pump 5, and vaporized.

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. At the time of cooling, since the refrigerant liquid liquefied by the cooling heat exchanger (condenser) can be naturally circulated to each fan coil unit by the action of gravity and the pressure of the vaporized refrigerant gas, the carrier power is not required. During heating, a pump for returning the liquefied refrigerant liquid passing through each fan coil unit to the heat exchanger (evaporator) for heating and another carrier pipe for returning the refrigerant liquid are 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 it also has the drawback of high equipment costs including piping construction costs.

[0004]

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. An object of the present invention is to provide a refrigerant circulation type air-conditioning system that can omit piping and simplify the system configuration.

[0005]

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 transport pipe.

[0006]

The cooling medium 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 to cool each room, and during heating the liquefied cooling medium is cooled. It is returned to the heat exchanger using the carrier pipe for supplying the refrigerant liquid.

[0007]

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 are for returning the liquefied refrigerant liquid passing through the heat exchanger of each fan coil unit 2 to the heat exchanger 1 during heating. The pumps 6 and 7 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.

When cooling, the valve 6 is opened and the valve 7 is opened.
When the fan coil unit is closed and the fan coil unit is operated, the refrigerant liquid cooled and liquefied in the heat exchanger 1 passes through the carrier pipe 3 in the direction of the solid line arrow to operate the fan coil unit 2
The refrigerant gas vaporized by heat exchange 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 passes through the carrier pipe 3 to the fan coil unit. The natural circulation cycle that is supplied to
The room in operation is cooled.

When heating, valve 6 is closed and valve 7 is
And the pump 5 is driven to operate the fan coil unit, the refrigerant gas heated by the heat exchanger 1 and vaporized passes through the carrier pipe 4 in the direction of the dotted line arrow to operate the fan coil unit 2 The refrigerant liquid that has passed through the heat exchanger and is liquefied by heat exchange at that time is sent to the transfer pipe 3 through the valve 7 opened by the pump 5, and passes through the transfer pipe 3 in the direction of the dotted line arrow to exchange heat. It is returned to the vessel 1, where it is vaporized again and is supplied to the fan coil unit through the carrier pipe 4 to heat the room in operation.

[0010]

According to the refrigerant circulation type air conditioning system of the present invention, the two heat exchangers for cooling and heating the refrigerant, which have been conventionally used, are combined into one heat exchanger for cooling and heating, and the refrigerant liquid is supplied. Since the carrier pipe for the refrigerant is also used as the carrier pipe for returning the refrigerant liquid, the three carrier pipes required for the carrier of the refrigerant in the past can be made into two, which is a wasteful pipe. By omitting the above, the system configuration can be simplified, and the facility cost including the piping construction cost can be made extremely low as compared with the conventional system.

[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 Conveying Pipe 4 Conveying Pipe 5 Pump 6 Valve 7 Valve

Claims (1)

[Claims] 1. A heat exchanger is installed at a position 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 configured to cool each room by cooling the refrigerant liquid in the heat exchanger to the fan coil unit naturally 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 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. A refrigerant circulation type air conditioning system, which is characterized in that