JPH05118700A - Heat pump type air-conditioner - Google Patents

Abstract

PURPOSE:To improve heat exchanging performance and increase a heat collecting amount by a method wherein an underground heat exchanger is buried in the ground while a compressor, an indoor heat exchanger and an expansion valve are connected sequentially to the underground heat exchanger, in the title facility utilizing underground heat. CONSTITUTION:An underground heat exchanger 10 is buried into the ground 20 while a compressor 17, an indoor heat exchanger 21 and an expansion valve 23 are connected to the underground heat exchanger 10 sequentially through a pipeline 25. The underground heat exchanger 10 is constituted of a doubletube type heat exchanger consisting of an outer tube 11 and an inner tube 12 and refrigerant, entered the inner tube 12 from the upper part thereof as shown by a broken line arrow sign in a diagram, is discharged out of the lower end of the inner tube 12, then, ascends between the outer tube 11 and the inner tube 12 and is gasified while absorbing subterranean heat. Then, the refrigerant is pressurized by the compressor 17 and dissipates heat in an indoor heat exchanger 21 whereby heating is effected. The refrigerant, heat is dissipated, is returned into the inner tube 12 through an expansion valve 23. In cooling, the refrigerant is compressed by the compressor 17 and descends through the outer tube 11 as shown by a full line arrow sign in the diagram, then, dissipates the heat thereof into the ground whereby the refrigerant is liquefied and is ascended through the inner tube 12. Then, is choked adiabatically by the expansion valve 23 and enters the indoor heat exchanger 21 to cool the inside of a room whereby the refrigerant is gasified and is returned into the compressor 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner, and more particularly to a heat pump type air conditioner utilizing underground heat.

[0002]

2. Description of the Related Art Conventionally, as a heat pump type air facility utilizing underground heat, a compressor, an indoor heat exchanger, an expansion valve,
And the outdoor heat exchangers are sequentially connected to form a heat pump, the primary refrigerant is circulated in the heat pump, and the underground heat exchanger is embedded in the ground, and the underground heat exchanger and the outdoor heat described above are embedded. A heat pump type air conditioner in which a secondary refrigerant is circulated in an exchanger is known.

However, in the heat pump type air conditioner of the type in which the secondary refrigerant is circulated as described above, since the primary refrigerant and the secondary refrigerant are used, there is a problem that the heat exchange performance as a whole is poor. In addition, because a circulation pump is used for circulation of the secondary refrigerant, and a large number of heat exchangers are required,
Equipment costs and operating costs increase.

There is also a heat pipe type heat exchanger used as an underground heat exchanger, but the heat pipe type heat exchanger is of a hermetically sealed type, and the refrigerant enclosed therein is natural. You are convection. Therefore, the amount of heat taken from the ground is very small, and a large capacity device requires a large number of heat pipes.

[0005]

As described above, the conventional heat pump type air conditioning equipment is an air conditioning equipment of the type in which the secondary refrigerant is circulated between the underground heat exchanger and the outdoor heat exchanger, and therefore, as a whole. Poor heat exchange performance. Further, since a circulation pump is used and a large number of heat exchangers are required, equipment costs and operating costs increase. Further, in the case where a heat pipe type heat exchanger is used as the underground heat exchanger, the amount of heat taken from the ground is small because the refrigerant enclosed therein performs natural convection.

The present invention has been made in consideration of the above points, and has a high heat exchange performance and can suppress the equipment cost and the operation cost at a low level, and can take a large amount of heat from the ground. An object is to provide a heat pump type air conditioning equipment that can be used.

[0007]

According to the present invention, an underground heat exchanger is buried in the ground, and a compressor, an indoor heat exchanger, and an expansion valve are sequentially connected to the underground heat exchanger. It is a heat pump type air conditioner.

[0008]

During heating, the refrigerant compressed by the compressor flows into the indoor heat exchanger, the expansion valve and the underground heat exchanger, where the underground heat exchanger takes heat from the ground and returns to the compressor.

During cooling, the refrigerant compressed by the compressor is
Heat is dissipated in the underground heat exchanger, and then returns to the compressor via the expansion valve and the indoor heat exchanger.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing an embodiment of a heat pump type air conditioning equipment according to the present invention.

In FIG. 1, an underground heat exchanger 10 having an outer pipe 11 and an inner pipe 12 is buried in a ground 20, and compressed to the outer pipe 11 of the underground heat exchanger 10 via a connecting pipe 13. Machine 17
Are connected. Further, the compressor 17 has an indoor heat exchanger 2
1 is connected via a pipe 25, and an indoor heat exchanger 2
An expansion valve 23 is connected to 1 via a pipe 25.
Further, the expansion valve 23 is connected to the inner pipe 12 of the underground heat exchanger 10. In this way, a heat pump type air conditioner in which the underground heat exchanger 10 is directly incorporated is constructed.

Next, the underground heat exchanger 10 will be described in detail with reference to FIG.

In FIG. 2, the underground heat exchanger 10 is an outer pipe 1.
1 and an inner tube 12 provided in an outer tube 11 to form a double tube heat exchanger. In this underground heat exchanger 10, the refrigerant 30 flowing into the inner pipe 12 from above rises from the lower end of the inner pipe 12 between the outer pipe 11 and the inner pipe 12.
After that, the refrigerant 30 enters the compressor 17 through the connecting pipe 13 attached to the upper portion of the outer pipe 11, is pressurized by the compressor 17, and then returns to the inner pipe 12 again.

Next, the operation of this embodiment having such a configuration will be described.

During heating, as shown by the broken line in FIG. 1, the refrigerant such as CFC gas pressurized by the compressor 17 enters the indoor heat exchanger 21 to heat and liquefy the room. Thereafter, the refrigerant is adiabatically throttled by the expansion valve 23 and enters the inner pipe 12 of the underground heat exchanger 10. Subsequently, the refrigerant flowing from the inner pipe 12 into the outer pipe 11 is heated by the underground heat, becomes a gas, and returns to the compressor 17.

The refrigerant in the outer tube 11 undergoes the following phase change. That is, the liquid region 14 in the lower portion inside the outer tube 11
In, the refrigerant is initially in a liquid state. Thereafter, the refrigerant is heated by the underground heat in the boiling region 15 having the evaporation surface 31, and rises while boiling. Subsequently, the refrigerant is vaporized in the gas region 16 and sent to the connecting pipe 13.

In this case, the refrigerant 30 flowing from the inner pipe 12 of the underground heat exchanger 10 into the outer pipe 11 is forced to flow into the outer pipe 11, so that the heat transfer coefficient is improved as compared with natural convection. be able to. In the boiling region 15 in the outer tube 11, the refrigerant 30 is heated by the underground heat with a large heat transfer coefficient, so that the refrigerant can be efficiently heated by the underground heat.

On the other hand, during cooling, as shown by the solid line in FIG.
The refrigerant pressurized by the compressor 17 is the underground heat exchanger 10
Enters the outer pipe 11 of the inner pipe, radiates heat to the ground and becomes a liquid, and the inner pipe 1
Enter within 2. After that, the refrigerant is adiabatically throttled by the expansion valve 23. Subsequently, the refrigerant enters the indoor heat exchanger 21, cools the room to be vaporized, and returns to the compressor 17.

The phase change in the outer tube 11 is as follows. That is, the gas refrigerant 30 flowing into the gas region 16 of the outer tube 11 gradually condenses in the boiling region 15 while radiating heat to the ground, and is completely liquefied in the liquid region 14. Also in this case, since the refrigerant 30 is forced to flow into the outer pipe 11 and the gas refrigerant 30 is condensed in the boiling region 15, heat can be efficiently radiated into the ground.

[0020]

As described above, according to the present invention,
Since the underground heat exchanger is directly incorporated in the heat pump type air conditioning equipment, it is possible to improve the overall heat exchange performance as compared with the case where the secondary refrigerant is used. Further, since it is not necessary to use a circulation pump or provide a large number of heat exchangers for circulating the secondary refrigerant, it is possible to prevent an increase in equipment costs and operating costs. Further, since the refrigerant is forcibly sent into the underground heat exchanger, the heat transfer coefficient is increased as compared with natural convection, and the heat exchange performance can be further improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a heat pump type air conditioning equipment according to the present invention.

FIG. 2 is a perspective view showing an underground heat exchanger of a heat pump type air conditioning equipment.

[Explanation of symbols]

 10 underground heat exchanger 11 outer pipe 12 inner pipe 17 compressor 20 underground 21 indoor heat exchanger 23 expansion valve

Claims (1)

[Claims] 1. A ground heat exchanger is buried in the ground, and
A heat pump type air conditioner in which a compressor, an indoor heat exchanger, and an expansion valve are sequentially connected to the underground heat exchanger.