JPH05231747A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to carry out indoor air conditioning by inhibiting a reduction in an indoor living space or an indoor space and using an under- floor space. CONSTITUTION:An under-floor heat exchanger 24 is installed to an under-floor space of a house. The under-floor heat exchanger 24 is connected to an outdoor heat exchanger (condenser) of a refrigeration cycle in parallel. When the temperature of the under floor-space fails to exceed a specified value, there is installed a control valve 21 which introduces refrigerant to the under floor-heat exchanger 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner that cools or heats a room by utilizing the heat of the sun or the heat of an underfloor space.

[0002]

2. Description of the Related Art As a device for air-conditioning a room by utilizing solar heat or heat from an underfloor space, it is described in Japanese Utility Model Publication No. 1-1393.
There is publication No. 5.

In the air conditioner disclosed in this publication, the solar heat collector and the underfloor space are connected by a duct, dampers are provided at the openings of the duct, and the heat forming the refrigeration cycle is provided in the duct. An exchanger is built in, and the air flowing in the duct and the refrigerant flowing in the heat exchanger are heat-exchanged.

Then, for example, in the winter, the air heated by the solar collector is introduced, and in the summer, the air cooled by the ground cooling heat of the underfloor space is introduced into the heat exchanger through the ducts. It uses air as a heat source.

[0005]

In such an air conditioner, a duct connecting the solar heat collector and the underfloor space, a plurality of dampers for controlling the flow of air in the duct, and a plurality of dampers in the duct are provided. A heat exchanger or the like to be stored may be required and the equipment may be large. Moreover, since this duct extends from the ceiling of the house to the underfloor, for example, when this duct is placed along the interior wall surface, the living space in the room becomes smaller, while when this duct is stored in the partition wall, it becomes a partition wall. It is conceivable that the room becomes narrower as a result of the thickening.

Furthermore, the control specifications and structure of the ducts and dampers must be individually determined according to the floor plan of the house in which they are installed, and the cost increase cannot be denied.

According to the present invention, it is possible to effectively utilize the existing equipment and suppress the reduction of the size of the living space or the interior of the room, and use the heat of the solar heat or the space under the floor to perform the air conditioning of the room. It was intended.

[0008]

In order to achieve this object, a first aspect of the present invention is to provide a compressor, which enables a cooling operation.
While connecting the condenser, pressure reducer, and evaporator in sequence with refrigerant pipes,
An underfloor heat exchanger is provided in the underfloor space of the house, and this underfloor heat exchanger is connected in parallel with the condenser, and a control valve that guides the refrigerant to this underfloor heat exchanger when the temperature of this underfloor space is below a prescribed value. It is provided. Further, a second aspect of the invention is to connect a compressor, a condenser, a decompressor, and an evaporator with a refrigerant pipe in order so that a heating operation can be performed, and a solar heat collector into which a refrigerant flows into an outlet pipe of the condenser. In addition, when the refrigerant flowing into the solar heat collector is at a predetermined temperature or higher, a bypass pipe for returning the refrigerant to the compressor by-passing the pressure reducer and the evaporator is provided.

[0009]

[Operation] When the temperature of the underfloor space is lower than the predetermined value during the cooling operation, the underfloor heat exchanger arranged in this underfloor space is caused to act as a condenser, and the refrigerant flows into the solar heat collector during the heating operation. When the temperature of the refrigerant is equal to or higher than a predetermined temperature, the refrigerant is evaporated by this heat collector.

[0010]

EXAMPLE FIG. 1 shows a part of a house, 1 is an indoor unit arranged in a room 2, 3 is a solar heat collector arranged in a roof 4, 5 is an underfloor unit housed in an underfloor space 6, 7,
Reference numeral 8 denotes an outdoor unit and a hot water storage unit which are installed outdoors, and these devices are connected by a refrigerant pipe to form an air conditioner 9
Is configured.

FIG. 2 is a refrigerant circuit diagram of the air conditioner 9. The outdoor unit 7 accommodates the compressor 10, the four-way valve 11 and the outdoor heat exchanger 12, and the first unit to the third unit. The pipes 13, 14 and 15 are connected to the indoor unit. Here, the first inter-unit pipe 13 is the four-way valve 1.
First, the second inter-unit pipe 14 is connected to the third inter-unit pipe 15 via the first control valve 16, the second control valve 17, and the third control valve 18. And the outdoor heat exchanger 1
Reference numeral 2 is a conduit 1 connecting the first control valve 16 and the second control valve 17.
9 is provided, and 20 is a fourth control valve provided in the conduit of the outdoor heat exchanger 12, one end of which is the fifth control valve 2
Connected to 1. One end of this fifth control valve 21 has a sixth
The control valve 22 is connected to the seventh control valve 23 at the other end. The seventh control valve 23 is provided in a unit pipe pipe 26 that connects an underfloor heat exchanger 24 built in the underfloor unit 5 and a hot water storage tank 25 of the hot water storage unit 8.

The pipe 27 connected to the four-way valve 11 is connected to the third control valve 18 via the eighth control valve 28. One end of the eighth control valve 28 is connected to the hot water storage unit 8 via the sixth control valve 22.

The indoor unit 1 has an indoor heat exchanger 29.
And a parallel circuit 32 including a main decompressor 30 and a check valve 31.
And 9 are connected in series, and the indoor heat exchanger 29 side is connected to the first inter-unit pipe 13 by the ninth control valve 33.
And a tenth control valve 34 to which the second inter-unit pipe 14 is connected. An eleventh control valve 35 is provided between the indoor heat exchanger 29 and the parallel circuit 32, and a twelfth control valve 36 is provided at one end of the parallel circuit 32.
Is provided. These tenth to twelfth control valves 3
4, 35 and 36 are connected to the solar heat collector 3 via inter-unit pipes 37 and 38. Here, in particular, a parallel circuit 40 of an on-off valve 38 and an auxiliary decompressor 39 is provided in the pipeline connecting the tenth control valve 34 and the thirteenth control valve 37. The twelfth control valve 36 is connected to the underfloor heat exchanger 24 and the third control valve 18 via the fourteenth control valve 37.

Reference numeral 41 is an underfloor temperature sensor provided in the underfloor unit 5, 42 is an outside air temperature sensor provided in the outdoor unit 7, 43 is a water temperature sensor for detecting the hot water temperature of the hot water storage tank 25, and these sensors 41, 42 , 43 are input to the cooling controller 44 to perform the opening / closing operation of the control valve, which will be described later, during the cooling operation. Reference numeral 45 denotes a refrigerant temperature sensor attached to the solar heat collector 3, which is connected to a heating controller 46 and causes a control valve to be opened and closed as will be described later during heating operation. still,
Each of the control valves described above is called a three-way switching valve.

In the air conditioner having such a structure, when performing the cooling operation, the four-way valve 11 is set to the state shown by the solid line in FIG. Here, the temperature inside the underfloor space is detected by the underfloor temperature sensor 41, and the hot air outside the room is detected by the outside air sensor 42. When the underfloor temperature is lower than the outside air temperature, the refrigerant discharged from the compressor 10 is indicated by a solid arrow. Each control valve is controlled to open and close so as to flow normally. That is, the refrigerant is the compressor 10-
Four-way valve 11-Hot water storage tank 25-Underfloor heat exchanger 24-Main decompressor 30-Indoor heat exchanger 29-Four-way valve 11-Compressor 10 Flows, and hot water storage tank 25 and underfloor heat exchanger 24 act as a condenser. The indoor heat exchanger 29 acts as an evaporator to cool the room 2. As described above, when the temperature of the underfloor space 6 is lower than the outside air temperature, the geocooling heat of the underfloor space is used as a heat source rather than the outside air temperature. This effectively uses the geothermal heat of the underfloor space. During such cooling operation, the hot water temperature in the hot water storage tank 25 is measured by the water temperature sensor 43.
When the temperature exceeds a predetermined value, the refrigerant flowing out from the four-way valve 11 is cooled by the hot water storage tank 2 as indicated by the broken line arrow.
5 is bypassed and the underfloor heat exchanger 24 is directly fed from the four-way valve 11
I am trying to lead to.

Further, by continuing such cooling operation, the temperature of the underfloor space 6 is detected by the underfloor temperature sensor 41, and when the temperature becomes higher than the outside air temperature, the refrigerant discharged from the compressor 10 is discharged. In order to flow as indicated by the one-dot chain line arrow, each control valve is controlled to open and close. Then, the compressor 10-four-way valve 11-outdoor heat exchanger 12-main decompressor 30-indoor heat exchanger 29-four-way valve 11-compressor 10 flows, and the outdoor heat exchanger 12 serves as a condenser and the indoor heat exchanger. 29 acts as an evaporator.

Each control valve for switching the flow of the refrigerant during the cooling operation is the underfloor temperature sensor 4
1, the output from the outside air temperature sensor 42, the output from the water temperature sensor 43 is controlled by the signal of the cooling controller 44 input.

In other words, the connection state of these devices is rephrased mainly about the flow of the refrigerant during the cooling operation, and the underfloor heat exchanger 24 and the outdoor heat exchanger (condenser) 12 are connected in parallel to each other so that the temperature of the underfloor space is predetermined. When the temperature is lower than the value (outside air temperature), the refrigerant is switched to the underfloor heat exchanger 24 and flown to the outdoor heat exchanger 12 when the temperature is higher than the predetermined value. That is, the cooling operation is performed by effectively utilizing the ground cooling heat of the underfloor space.

Next, when performing heating operation, the four-way valve 11
Is set to the solid line state in FIG. Then, each control valve is controlled to open and close so that the refrigerant discharged from the compressor 10 flows as shown by the solid arrow. That is, the refrigerant is condensed in the compressor 10-the four-way valve 11-the indoor heat exchanger 29-the check valve 31-the solar heat collector 3-the on-off valve 38-the four-way valve 11-the compressor 10 and the flow indoor heat exchanger 29. The liquid refrigerant is evaporated by the solar heat collector 3 and returned to the compressor 12. This heating operation is called a "heat transfer cycle" rather than a so-called "refrigeration cycle operation", and the compressor 12 is used as a refrigerant circulation pump.

At this time, if the temperature of the refrigerant in the solar heat collector 3 is detected by the refrigerant temperature sensor 45 and is below a predetermined value, that is, if the refrigerant cannot be sufficiently evaporated in the solar heat collector 3, this solar heat The refrigerant flowing out from the heat collector 3 is passed through the solar heat collector 3-auxiliary decompressor 39-outdoor heat exchanger 12-four-way valve 11-compressor 10 as shown by the dashed arrow, and the indoor heat exchanger 29, solar heat The heat collector 3 acts as a condenser, the outdoor heat exchanger 12 acts as an evaporator, and the so-called "refrigeration cycle operation" is switched.

Even during this operation, the temperature of the refrigerant in the solar heat collector 3 is detected by the refrigerant temperature sensor 45, and if the temperature of the refrigerant further decreases, the refrigerant from the indoor heat exchanger 29 is indicated by the alternate long and short dash line arrow. As described above, the solar heat collector 3 is bypassed to flow to the auxiliary pressure reducer 39.

Each control valve for switching the flow of the refrigerant during the heating operation is a refrigerant temperature sensor 4
It is controlled by the signal of the heating controller 46 to which the output from 5 is input.

In other words, the connection state of these devices, in other words, the flow of the refrigerant during the heating operation, is an indoor heat exchanger (condenser).
The solar heat collector 3 is connected to the outlet pipe of 29, and when the temperature of the refrigerant flowing into the solar heat collector 3 is equal to or higher than a predetermined value, the auxiliary decompressor 39 and the outdoor heat exchanger (evaporator) 12 are bypassed. Then, a bypass pipe for returning to the compressor 10 (corresponding to a refrigerant pipe 47 provided with an opening / closing valve 38 and a refrigerant pipe 48 extending from the first control valve 16 to the third control valve 18 via the second control valve 17). Since the solar heat collector 3 can provide a sufficient heat source, the heat source can be effectively used to heat the room.

As described above, the ground cooling heat of the underfloor space 6 is used to cool the room 2 and the solar heat is used to heat the room 2.
The refrigerant in the refrigeration cycle is used. Therefore, the underfloor unit 5 arranged in the underfloor space 6, the solar heat collector 3 arranged on the roof, the outdoor unit 7, the indoor unit 1
All are connected by a refrigerant pipe. Therefore, by embedding these refrigerant pipes in the wall surface of the house, the living space of the house can be effectively utilized.

[0025]

As described above, according to the first aspect of the present invention, the underfloor heat exchanger is provided in the underfloor space of the house, and the underfloor heat exchanger is connected in parallel with the condenser constituting the refrigeration cycle.
Since the refrigerant is guided to the underfloor heat exchanger when the temperature of the underfloor space is equal to or lower than a predetermined value, it is possible to effectively use the ground cooling heat of the underfloor space in summer to cool the room. A second invention is provided with a solar heat collector, which is connected to an outlet pipe of a condenser forming a refrigeration cycle, and when the refrigerant flowing into the solar heat collector has a temperature equal to or higher than a predetermined temperature. Since this refrigerant is returned to the compressor by bypassing the decompressor and the evaporator which form the refrigeration cycle, it is possible to effectively use the solar heat in the winter to heat the room. Moreover, according to these inventions, since the heat exchanger arranged in the underfloor space, the solar heat collector or the outdoor heat exchanger and the indoor heat exchanger are connected by the refrigerant pipe, the duct is provided in the house as in the conventional case. It is possible to minimize the size of the living space or the interior of the house, as compared to the case where the air conditioners are arranged to allow air conditioning.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a house in which an air conditioner of the present invention is arranged.

FIG. 2 is a refrigerant circuit diagram showing a refrigerant flow during a cooling operation in the air-conditioning apparatus shown in FIG.

FIG. 3 is a refrigerant circuit diagram showing a refrigerant flow during heating operation in the air-conditioning apparatus shown in FIG.

[Explanation of symbols]

 3 Solar Heat Collector 10 Compressor 12 Outdoor Heat Exchanger 21,37 Control Valve 24 Underfloor Heat Exchanger 30 Main Pressure Reducer 39 Auxiliary Pressure Reducer 47,48 Refrigerant Pipe (Side Pipe)

Claims (2)

[Claims] 1. An air conditioner capable of performing cooling operation by sequentially connecting a compressor, a condenser, a decompressor, and an evaporator with a refrigerant pipe, wherein an underfloor heat exchanger is provided in an underfloor space of a house, and the underfloor heat exchanger is provided. Is connected in parallel with the condenser, the control valve for guiding the refrigerant discharged from the compressor to the underfloor heat exchanger when the temperature of the underfloor space is equal to or lower than a predetermined value. Harmony device. 2. An air conditioner capable of performing heating operation by sequentially connecting a compressor, a condenser, a decompressor, and an evaporator with a refrigerant pipe, and connecting a solar heat collector into which a refrigerant flows to an outlet pipe of the condenser. An air conditioner comprising a bypass pipe for returning the refrigerant, which bypasses the pressure reducer and the evaporator, to the compressor when the refrigerant flowing into the solar heat collector has a predetermined temperature or higher. ..