JPH081372Y2 - Refrigerant natural circulation heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> In the present invention, an evaporator on the heat source side and a condenser on the heating side are connected in communication through a refrigerant pipe, and the evaporator and the evaporator are connected to each other. It is configured to circulate and flow the refrigerant in a hermetically sealed state across the condenser and the refrigerant pipe, and, as the refrigerant, a refrigerant that undergoes a phase change from vapor to liquid with heat exchange in the condenser is used, and The present invention relates to a refrigerant natural circulation heating system having a head difference between an evaporator and the condenser, the head difference being sufficient to transfer a refrigerant that has changed into a liquid phase to the evaporator.

<Prior Art> As a refrigerant natural circulation type heating system of this type, as disclosed in JP-A-48-101640,
The condenser is provided in the room as a heating unit, while the evaporator is provided as a heat absorption unit, and a predetermined head is held between the condenser and the evaporator, and a liquefiable gas refrigerant is provided in a pipe connecting these units. It is configured such that the refrigerant is naturally circulated by filling and gasifying in the evaporator and liquefying in the condenser to heat the room.

<Problems to be solved by the invention> However, since the refrigerant pipe supplying the refrigerant vapor to the condenser is cooled at night, at the start of operation such as in the morning, the refrigerant pipe inside the refrigerant pipe supplying the refrigerant vapor Pressure and
The refrigerant liquid liquefied in the condenser is in the same state as the pressure in the refrigerant pipe for returning it to the condenser, and it is difficult to supply the refrigerant vapor to the condenser, and there is a drawback that heating starts up slowly.

The present invention has been made in view of such circumstances, and it is an object of the present invention to make it possible to smoothly supply refrigerant vapor to a condenser at the start of operation such as in the morning so that heating can be started quickly. And

<Means for Solving the Problems> The present invention, in order to achieve the above-mentioned object, in the refrigerant natural circulation heating system described at the beginning, the refrigerant liquid is connected to the condenser so that the refrigerant liquid is supplied to the evaporator. A refrigerant take-out pipe is communicatively connected to the flowing-down refrigerant pipe at the uppermost position of the pipe portion facing the vertical direction or a position close thereto, and a cooling means for cooling the refrigerant is attached to the refrigerant take-out pipe.

As the cooling means, various configurations such as a heat exchanger that cools the refrigerant by exchanging heat with the outside air or a heat exchanger that cools the refrigerant by exchanging heat with cold water or the like can be adopted.

<Operation> According to the configuration of the refrigerant natural circulation heating system according to the present invention, the cooling means is operated at the start of operation such as in the morning or before the start of operation, and the refrigerant liquid liquefied by the condenser is supplied to the evaporator. By cooling the refrigerant vapor in the pipe, the pressure in the refrigerant pipe is reduced, and a pressure difference is generated between the refrigerant pipe and the refrigerant pipe on the side that supplies the refrigerant vapor to the condenser, and the refrigerant vapor is condensed on the condenser side. <Example> Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall system configuration diagram showing an embodiment of a refrigerant natural circulation type heating system, and 1 shows an evaporator installed in a basement of a building or the like, in the case where this evaporator 1 is used in combination with a cooling system. Hot water obtained by using exhaust heat from the refrigeration system or hot water from the district heating and cooling system is supplied as a heat source.

An individual air conditioner 4 including a blower fan 2 and a condenser 3 is provided in each room on each floor of the building.

The evaporator 1 and the condenser 3 are connected to each other through a refrigerant pipe 5 for supplying a refrigerant vapor and a refrigerant pipe 6 for flowing a refrigerant liquid, and the evaporator 1, the condenser 3 and the refrigerant are connected to each other. A refrigerant that changes its phase from vapor to liquid due to heat exchange in the condensers 3 and changes its phase from liquid to vapor due to evaporation in the evaporator 1 is sealed in a sealed state across the pipes 5 and 6.

The evaporator 1 is arranged at a position lower than each of the condensers 3 ... And the refrigerant, which has been phase-changed from vapor to liquid due to condensation accompanying heat exchange in each of the condensers 3 ... Along with the evaporation in the evaporator 1, a head difference is provided so that the refrigerant, which has been phase-changed from liquid to vapor, rises and is supplied to each of the condensers 3 ... Due to the phase change, the refrigerant becomes the evaporator 1
And the condenser 3 are so constructed as to naturally circulate and flow.

Freon gas R-22 is used as the refrigerant. This has an advantage that it does not damage the ozone layer because it contains hydrogen and chlorine and decomposes by convection.

An electromagnetic opening / closing valve 7 for stopping the outflow of the refrigerant liquid is provided at each outlet of the condenser 3 of the refrigerant pipe 6 for flowing the refrigerant liquid.
Is provided.

In the refrigerant pipe 5 for supplying the refrigerant vapor, the evaporator 1
A gas-liquid separator 8 for gas-liquid separation and a receiver 9 having a volume sufficient to accommodate the entire amount of the filled refrigerant liquid are provided at a position close to the position of the evaporator 1 in a space above the receiver 9. The refrigerant vapor outlet and the upper space of the gas-liquid separator 8 are connected in communication with each other, and the lower portion of the gas-liquid separator 8 and the receiver 9 are connected.
And are connected in communication, and the lower part of the receiver 9 and the refrigerant liquid inlet to the evaporator 1 are connected in communication.

A check valve 10 for preventing a reverse flow of the refrigerant liquid is interposed in a refrigerant liquid flow-down refrigerant pipe 6 which connects the refrigerant liquid inlet of the evaporator 1 and the condenser 3 to each other.

The branch point between the horizontal pipe portion 6a and the vertical pipe portion 6b of the refrigerant liquid flow-down refrigerant pipe 6 connected to the condenser 3 located at the uppermost position, that is, the vertical direction, At the uppermost position of the facing pipe portion 6b, the refrigerant withdrawal pipe 11 is connected and connected, and the refrigerant withdrawal pipe
11 is extended to a rooftop tower or the like and is connected to an outdoor heat exchanger 12 as a cooling means installed therein to cool the refrigerant vapor in the refrigerant pipe 6 for flowing the refrigerant liquid to cool the refrigerant pipe 6
It is configured to reduce the pressure inside. As the refrigerant take-out pipe 11, it is preferable to use a large-diameter pipe in order to suppress the interference between the steam supplied to the outdoor heat exchanger 12 and the refrigerant liquid flowing down from the outdoor heat exchanger 12.

A blower fan 13 is attached to the outdoor heat exchanger 12, and a timer 15 is connected to a drive circuit 14 of the blower fan 13, and the timer 15 uses, for example, an operation start time of 8 am
20 minutes before the hour, that is, a predetermined drive time such as 7:40 am to 8 am is set, the blower fan 13 is driven prior to the start of the heating operation, and the refrigerant pipe for flowing the refrigerant liquid is set. It is configured so that the refrigerant vapor in 6 can be cooled well.

A trap 16 is provided in the lower side refrigerant take-out pipe 11 which is connected to the outdoor heat exchanger 12 so as to cool the refrigerant vapor and liquefy the refrigerant liquid to be rapidly returned into the refrigerant pipe 6. It is configured to prevent.

Although not shown in the drawing, the horizontal refrigerant pipes 6 which flow the refrigerant liquid from each of the condensers 3 ... to the evaporator 1 side, which are arranged on each floor, become lower toward the side away from the condenser 3. Is provided so as to be inclined, and is configured so that the refrigerant liquid can easily flow down to the evaporator 1 and be returned.

The refrigerant take-out pipe 11 may be connected to the refrigerant pipe 6 at a location near the uppermost position of the pipe portion 6b facing the vertical direction.

In the above embodiment, the blower fan 13 is configured to be driven prior to the start of the heating operation, but the present invention may be driven simultaneously with the start of the heating operation. The blower fan 13 may be driven in response to the activation of the heating operation switch, the timer may be activated, and the blower fan 13 may be driven only during the subsequent 10 to 30 minutes.

Further, the cooling means of the present invention may be the one without the blower fan 13, and further, the outdoor heat exchanger as described above.
Not limited to 12, various configurations can be adopted, for example, by attaching a heat exchanger for exchanging heat with cold water by a refrigerator or the like to the refrigerant take-out pipe 11.

Further, the ventilation air may be configured to be cooled by air taken into the room, and the cooling air may be used to preheat the ventilation air.

According to the present invention, one condenser 3 to be used is provided,
The present invention can also be applied to a case where the warm air obtained by the condenser 3 is distributed and supplied to each room or the like through a duct.

<Effect of the Invention> According to the refrigerant natural circulation heating system according to the present invention,
At the start of operation in the morning or the like, a pressure difference can be generated between the refrigerant vapor supply side and the refrigerant liquid flow side so that the refrigerant vapor can smoothly flow to the condenser side, so that the refrigerant vapor can be condensed early. The heating by the individual air conditioner can be quickly started, and comfortable heating can be performed.

[Brief description of drawings]

FIG. 1 is an overall system configuration diagram showing an embodiment of a refrigerant natural circulation heating system according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Evaporator 3 ... Condenser 5 ... Refrigerant pipe for supplying refrigerant vapor 6 ... Refrigerant pipe for supplying refrigerant liquid 6b ... Vertically oriented pipe portion 11 ... Refrigerant take-out pipe 12 ... Heat exchanger as cooling means

Front page continued (72) Inventor Kensuke Tokunaga 4-1-1 Honmachi, Chuo-ku, Osaka-shi, Osaka Takenaka Corporation, Osaka Main Store (72) Inventor Nozomi Kusumoto 4-1-1, Honmachi, Chuo-ku, Osaka-shi, Osaka No. 13 Takenaka Corporation Osaka Main Store (72) Inventor, Satoshi Sugiura 4-1-1 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation Osaka Main Store (72) Inventor Takeo Ueno Gold, Sakai City, Osaka Prefecture 1304 Okamachi Daikin Industries, Ltd. Sakai Plant Kanaoka Factory

Claims (2)

[Scope of utility model registration request] 1. An evaporator on the heat source side and a condenser on the heating side are connected in communication via a refrigerant pipe, and the refrigerant is circulated in a sealed state across the evaporator, the condenser and the refrigerant pipe. It is configured to flow, and as the refrigerant, while using a refrigerant that undergoes a phase change from vapor to liquid with heat exchange in the condenser, between the evaporator and the condenser, in the liquid In a refrigerant natural circulation heating system having a head difference sufficient to transfer a phase-changed refrigerant to the evaporator, in a refrigerant pipe that is connected to the condenser and flows a refrigerant liquid to the evaporator, the vertical direction thereof. Refrigerant natural circulation heating system characterized in that the refrigerant take-out pipe is connected and connected at the uppermost position of the pipe portion facing the Tem. 2. A refrigerant natural circulation heating system, wherein the cooling means according to claim (1) is a heat exchanger for cooling the refrigerant by heat exchange with the outside air.