JPH0571821A - Heating and cooling apparatus - Google Patents

Abstract

PURPOSE:To secure the heating capacity at a time when an outside air temperature lowers in the winter season while conducting defrosting in a short time. CONSTITUTION:A medium-temperature detecting means 7 provided between a decompression device 4 and a second heat exchanger 5 and a bypass pipe 14 with a second on-off valve 13 connected in parallel with a first on-off valve 12 are installed, the signal of the temperature detecting means 7 is input to a control means 11, a combustion heat source 10, the first on-off valve 12 and the second on-off valve 13 are controlled, heat is absorbed from air by the second heat exchanger 5, the medium of a second closing circuit flowing through a third heat exchanger 8 through a compressor 1 and a first heat exchanger 3 is heated, and heat is dissipated from an indoor heat exchanger 6 and heating is conducted. When heating load is increased due to the lowering, etc., of an outside air temperature or when the second heat exchanger 5 is frosted, the heat source 10 of a heater 9 is operated, the first on-off valve 12 is closed and the second on-off valve 13 is opened, the medium heated by the third heat exchanger 8 is reheated, and heating capacity is ensured while a comparatively high- temperature medium from the indoor heat exchanger 6 is utilized for defrosting, thus sufficiently acquiring heating capacity even when the outside air temperature lowers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating device having a heat pump and a combustion heat source.

[0002]

2. Description of the Related Art Conventionally, this type of cooling and heating device is shown in FIG.
There was a structure as shown in. As shown in the figure, it is composed of a compressor 1, a four-way valve 2, a refrigerant heater 3, a pressure reducing device 4, a second heat exchanger 5, an indoor heat exchanger 6, and the like.
During the heating operation, the medium heated by the refrigerant heater 3 and evaporated is conveyed by the compressor 1 to the indoor heat exchanger 6,
Here, the heat is condensed to liquefy and heat.

[0003]

However, in the above-mentioned conventional structure, the heating capacity is the sum of the amount of heat absorbed by the refrigerant heater 3 and the amount of heat of the compressor 1, and the air heat source of natural energy cannot be used. was there. In addition, the heat pump using only the air heat source has a problem that the outdoor heat exchanger is frosted in the winter and the capacity is insufficient.

The present invention solves the above-mentioned conventional problems. When the heating load is small and the air heat source is sufficient, the air heat source is used. On the other hand, when the heating load becomes large and the capacity becomes insufficient, the air heat source becomes An object of the present invention is to provide a cooling and heating device that can simultaneously utilize combustion heat and defrost in a short time in order to maximize the air heat source and secure heating capacity.

[0005]

In order to achieve the above object, the present invention provides a first closed circuit including a compressor, a four-way valve, a first heat exchanger, a pressure reducing device and a second heat exchanger, and the first closed circuit. 1
A third heat exchanger having a heat exchange relationship with the heat exchanger, a heater for heating the medium with combustion heat, an indoor heat exchanger, and a second closed circuit including a circulation pump, and the decompression device and the second heat exchange. A medium temperature detecting means provided between the reactors, a first opening / closing valve provided in the middle of the second closed circuit, and a second opening / closing valve connected in parallel to the first opening / closing valve to the second heat exchanger. A bypass pipe having the same is provided, and a control means for controlling the combustion heat source of the heater, the first opening / closing valve, and the second opening / closing valve by inputting a signal from the medium temperature detecting means is provided.

[0006]

With the above structure, the high-temperature and high-pressure refrigerant gas compressed by the compressor during the heating operation flows into the first heat exchanger through the four-way valve, where it is condensed and liquefied by the heat radiation function and flows into the decompression device. Then, it is decompressed and flows into the second heat exchanger, where it absorbs heat from the air heat source to become evaporative gas and returns to the compressor. Then, the medium temperature detecting means detects the frost formation of the second heat exchanger that occurs when the outside air temperature decreases in winter, and inputs a signal to the control means. The control means operates the combustion heat source of the heater, and the first opening / closing valve. And the second on-off valve is opened, the high-temperature medium in the second closed circuit flows through the bypass pipe, and the second frost is the largest.
It flows into the lower side of the heat exchanger (medium inlet side during heating) and defrosts.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In this embodiment, the same components as those shown in the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in the figure, the four-way valve 2 switches the flow direction of the refrigerant between heating operation and cooling operation, and the first heat exchanger 3 has a condensing action during the heating operation and an evaporating action during the cooling operation.
The decompression device 4 and the second heat exchanger 5 have an evaporating action during the heating operation and a condensing action during the cooling operation. Reference numeral 7 denotes a medium temperature detecting means, which is provided in the middle of the pressure reducing device 4 and the second heat exchanger 5. The compressor 1, the four-way valve 2, the first heat exchanger 3, the pressure reducing device 4, and the second heat exchanger 5 form a first closed circuit. The third heat exchanger 8 has a heat exchange relationship with the first heat exchanger 3. The heater 9 heats the medium by the combustion heat source 10, and the control means 11 inputs the signal of the medium temperature detection means 7 to control the combustion heat source 10. Reference numeral 12 is a first on-off valve, which is used for medium temperature detection means 7 when the second heat exchanger 5 is defrosted.
Is input to the control means 11 to close the second opening / closing valve 13
Is opened when the second heat exchanger 5 is defrosted. Reference numeral 14 denotes a bypass pipe, which flows below the first heat exchanger 3 (medium inlet side during heating), and is provided with a second on-off valve 13 in the middle. The circulation pump 15, the third heat exchanger 8, the heater 9, the indoor heat exchanger 6, the first opening / closing valve 12, the second opening / closing valve 13, and the bypass pipe 14 constitute a second closed circuit.

In the above structure, the cooling operation will be described first. That is, the high-temperature high-pressure gas refrigerant compressed by the compressor 1 flows in the direction of arrow A through the four-way valve 2. Then, it flows into the second heat exchanger 5 and is liquefied by the condensation action, decompressed by the decompression device 4, and flows into the first heat exchanger 3, where it is vaporized and gasified, passes through the four-way valve 2 and is passed to the compressor 1. Return. On the other hand, in the third heat exchanger 8 having a heat exchange relationship with the first heat exchanger 3, heat is radiated to the first heat exchanger 3, becomes cooler, and flows into the indoor heat exchanger 6, where heat is absorbed from the room. To cool. Then, it returns to the circulation pump 15.

Next, the heating operation will be described. First, the operation of the heat pump using only the air heat source will be described. The high-temperature, high-pressure gas refrigerant compressed by the compressor 1 flows in the direction of arrow B via the four-way valve 2. Then, it flows into the first heat exchanger 3, is liquefied by the condensation action, is decompressed by the decompression device 4 and flows into the second heat exchanger 5, where it is vaporized into gas and returns to the compressor 1 through the four-way valve 2. On the other hand, in the third heat exchanger 8 having a heat exchange relationship with the first heat exchanger 3, it absorbs heat from the first heat exchanger 3 to reach a high temperature, flows into the indoor heat exchanger 6, and performs a heating operation here. At this time, the outside air temperature is low and the second heat exchanger 5
When frost is formed on the surface of the second heat exchanger 5, the temperature of the refrigerant flowing through the second heat exchanger 5 decreases, which may cause insufficient heating capacity. In this case, the heat of combustion of the heater 9 and the first on-off valve 12 and the second on-off valve 13 are detected by the medium temperature detecting means 7.
To the first opening / closing valve 12 and the second opening / closing valve 13 is opened. The medium whose temperature has risen in the third heat exchanger 8 due to the heat radiating action from the first heat exchanger 3 is further heated by the combustion heat source 10 in the heater 9 and flows into the indoor heat exchanger 6 to perform the heating action. To do. Then, the relatively high temperature medium flowing out from the indoor heat exchanger 6 passes through the second opening / closing valve 13 and the bypass pipe 14 and flows into the lower side of the second heat exchanger 5, where it is defrosted and circulated by the circulation pump 15. Return to. Therefore, even when the outside air temperature decreases in winter and heating capacity is required, defrosting is performed in a short time and combustion heat is added to the heating capacity of the heat pump, so that the heating capacity can be secured.

[0010]

As is apparent from the above embodiments, the cooling and heating apparatus of the present invention includes the first closed circuit including the compressor, the four-way valve, the first heat exchanger, the pressure reducing device and the second heat exchanger, and the first closed circuit. 1) a third heat exchanger having a heat exchange relationship with the heat exchanger, a heater for heating the medium with combustion heat, an indoor heat exchanger and a second closed circuit including a circulation pump, and the decompression device and the second
A medium temperature detecting means provided between heat exchangers, a first opening / closing valve provided in the middle of the second closed circuit, and a second opening / closing valve connected to the second heat exchanger in parallel with the first opening / closing valve. And a control means for controlling the combustion heat source of the heater, the first on-off valve and the second on-off valve by inputting a signal from the medium temperature detecting means. When the heating load due to the decrease in the outside air temperature and the like becomes large due to the configuration, the medium is further heated by the heater,
The heating capacity can be secured, and for frost formation, the relatively high temperature medium flowing out from the indoor heat exchanger passes through the bypass pipe,
Since it flows below the second heat exchanger and defrosts, sufficient heating capacity can be obtained even when the outside air temperature drops, and the efficiency of the equipment can be improved because the air heat source is also used.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional refrigerant heating type air conditioner.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 3 1st heat exchanger 4 Pressure reducing device 5 2nd heat exchanger 6 Indoor heat exchanger 7 Medium temperature detection means 8 3rd heat exchanger 9 Heater 10 Combustion heat source 11 Control means 12 1st opening / closing Valve 13 Second on-off valve 14 Bypass pipe 15 Circulation pump

Claims (1)

[Claims] 1. A first closed circuit comprising a compressor, a four-way valve, a first heat exchanger, a pressure reducing device and a second heat exchanger, and a third heat exchanger having a heat exchange relationship with the first heat exchanger. A second closed circuit including a heater for heating the medium with combustion heat, an indoor heat exchanger, and a circulation pump, and the second decompression device and the second closed circuit.
A medium temperature detecting means provided between heat exchangers, a first opening / closing valve provided in the middle of the second closed circuit, and a second opening / closing connected in parallel to the first opening / closing valve to the second heat exchanger. A cooling / heating apparatus provided with a bypass pipe having a valve, and provided with control means for inputting a signal from the medium temperature detection means to control the combustion heat source of the heater, the first opening / closing valve, and the second opening / closing valve.