JPH0355737B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating and cooling system such as a separate air conditioner.

Conventional configuration and its problems Conventionally, heat pump type separate air conditioners are
During heating, when the outside air temperature drops, the heating capacity decreases and cannot cope with the heating load, so an auxiliary electric heater or the like is installed to increase the heating capacity.

However, those with built-in electric heaters, for example,
In extremely cold regions, heating is almost always done with a heater alone, and this auxiliary heater alone cannot provide heating for a large room heating load, so it is almost impractical in extremely cold regions. Therefore,
A recently developed technology is to indirectly heat an outdoor heat exchanger with gas or hot water during heating, and then release the heated heat from the indoor heat exchanger to cope with the heating load during extremely cold times. began to be used. In other words, when the outside temperature becomes low, sufficient heating capacity is achieved by heating the outdoor heat exchanger with gas etc., sending that heat via the refrigerant to the indoor heat exchanger, and releasing it indoors. It is an attempt to obtain.

However, in these conventional system systems, gas combustion is used only to heat the refrigerant in the outdoor heat exchanger, which is uneconomical, and although it is impossible to supply hot water, gas piping work and combustion equipment are required. becomes indispensable. Therefore,
A heating combustion device provided only to increase heating capacity has the disadvantage of being uneconomical and making the entire system of a separate air conditioner relatively expensive.

OBJECTS OF THE INVENTION It is an object of the present invention to alleviate these conventional drawbacks and provide a system that enables hot water supply, as well as to perform good refrigerant control during extremely cold heating.

Structure of the Invention An outdoor unit has a compressor, a four-way valve, an outdoor heat exchanger, a heating expansion valve, and a gas-liquid separator, and a plurality of indoor units connected to the outdoor unit have a cooling expansion valve, The outdoor unit includes an air-cooled heat exchanger that connects the outdoor heat exchanger to a boiler, and an instant heat exchange type refrigerant heating heat exchanger in which refrigerant gas is passed inside and hot water is passed outside using a double pipe system connected to a boiler. One electric three-way valve is installed between these heat exchangers and the heating expansion valve. During heating, this electric three-way valve either flows the refrigerant to the refrigerant heating heat exchanger side or In addition to selecting whether to flow to the cold heat exchanger side, the air-cooled heat exchanger side port is equipped with a No. 2 solenoid valve that opens and closes the flow to the air-cooled heat exchanger, and a No. 1 solenoid valve that bypasses the air-cooled heat exchanger. , a heating boiler is connected to the refrigerant heating heat exchanger.

This is a heating and cooling system connected to a type heating and hot water boiler.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described based on FIGS. 1 to 3. 1 is the outdoor unit, 2 is the No. 1 outdoor unit, 3 is the No. 2 indoor unit, 4 is the compressor, 5
is a four-way valve, 6 is an air-cooled heat exchanger on the outdoor side, 7 is a refrigerant heating heat exchanger such as an instant heat exchange type double pipe that allows refrigerant to flow inside and hot water to the outside, and 8 is for heating. An expansion valve, 9 a check valve, 10 a gas-liquid separator, 11 a three-way valve on the liquid side, 12 a first electromagnetic valve on the liquid side, and 13 a second liquid side valve.
Solenoid valves, 14 and 17 are cooling expansion valves, 15 and 18
1 is a check valve, 16 and 19 are indoor heat exchangers, 20 is a gas side first solenoid valve, 21 is a gas side second solenoid valve, 2
2 and 23 are check valves, 24 is a gas side three-way valve, 25 is an accumulator, 26 is a high-pressure pressure regulating valve, 27
2 is an electric three-way valve that operates by sensing outside temperature, etc.
8 is a No. 1 solenoid valve installed in the middle of the bypass circuit 29, 30 is a No. 2 solenoid valve installed in the middle of the bypass circuit 31, and 32 is a double-pipe boiler for heating and hot water supply, which draws in gas. The gas piping 33 is connected to each of the hot water supply ports 34, 35, 36, and 37, and is also connected to the refrigerant heating heat exchanger 7 via a pump 38 through piping 39, 40. The solid line arrow indicates a refrigerant circuit during cooling, and the dotted line arrow indicates a refrigerant circuit during heating.

In the above configuration, for example, during cooling,
As shown in Table 1, the electric three-way valve 27 flows between a and c, the No. 1 solenoid valve 28 is closed, and the No. 2 solenoid valve 30 is open.

During cooling, the compressor 4, four-way valve 5, air-cooled heat exchanger 6, No. 2 solenoid valve 30, electric three-way valve 27
between c and a, check valve 1, gas-liquid separator 10, liquid side three-way valve 11, No. 1 solenoid valve 12, No. 2 solenoid valve 13, cooling expansion valves 14, 17, indoor heat exchanger 16, 1
9, check valves 22 and 23, gas side three-way valve 24, four-way valve 5, and storage regulator 25. Therefore, at this time, the refrigerant heating heat exchanger 7 is bypassed, and the water supply from the heating and hot water supply boiler 32 is stopped.

Next, during heating, as shown in FIG.
In addition, the No. 1 solenoid valve 28 is open and the No. 2 solenoid valve 30 is closed, and when the temperature is high, it flows between a and c.
Further, the No. 1 solenoid valve 28 is closed, and the No. 2 solenoid valve 30 is opened.

During heating, the compressor 4, four-way valve 5, gas-side three-way valve 24, gas-side first solenoid valve 20, gas-side second solenoid valve 21, indoor heat exchangers 16, 19, check valves 15, 18 , liquid-side first solenoid valve 12, liquid-side second solenoid valve 13, liquid-side three-way valve 11, gas-liquid separator 10, heating expansion valve 8, electric Three-way valve 27 a-c, No. 2 solenoid valve 3
0, air-cooled heat exchanger 6, four-way valve 5, and storage unit 25. When the temperature is low, the electric three-way valve 27
-b, the refrigerant flows through the heat exchanger 7 for heating, and at this time, from the boiler 32 for heating and hot water supply to the piping 3.
Hot water is sent to the outer tube of the refrigerant heating heat exchanger 7 via tubes 9 and 40 to heat the refrigerant, and at this time, the refrigerant is immediately heat exchanged from the outer tube to the inner tube, and the heated refrigerant is
The flow passes through the No. 2 solenoid valve 28 and returns to the four-way valve 5, the accumulator 25, and the compressor 4.

Effects of the Invention As described above, the present invention is an instant heat exchange type in which an outdoor heat exchanger is connected to an air-cooled heat exchanger and a boiler in a double pipe format, and refrigerant gas is passed inside and hot water is passed outside. Since it is composed of a heat exchanger for heating refrigerant,
The heat exchange efficiency between the refrigerant and hot water in the refrigerant heating heat exchanger has been improved, the temperature of the hot water supplied can be improved even at low temperatures, the capacity of heat sources such as boilers can be reduced, and the size can be made smaller. At the time, an air-cooled heat exchanger performs heating using an outside air heat source, and when the outside temperature is low, the refrigerant is heated by hot water from the boiler in a refrigerant heating heat exchanger. Therefore, stable heating capacity can be obtained even during heating in severe cold.
This will solve the problem of insufficient heating capacity during extremely cold weather. Furthermore, by connecting a standard hot water boiler for heating, stable heating can be obtained as well as hot water supply, and the piping configuration is simple, so it is cost-effective.
It doesn't add much bulk. Therefore, as a heating and cooling system that can supply hot water, it exhibits practical effects such as being economical in terms of running costs and initial costs.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a separate air conditioner according to an embodiment of the present invention, Fig. 2 is a chart showing the flow state of the electric three-way valve, No. 1 solenoid valve and No. 2 solenoid valve during cooling, and Fig. 3 The figure is a chart diagram during heating. 6...Air cooling heat exchanger, 7...Refrigerant heating heat exchanger, 8...Heating expansion valve, 27...Electric three-way valve,
28...No. 1 solenoid valve, 30...No. 2 solenoid valve, 30
...Boiler for heating and hot water supply.

Claims (1)

[Claims] 1. An outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, a heating expansion valve, and a gas-liquid separator; and a plurality of indoor units connected to this outdoor unit each having a cooling expansion valve; The unit includes an air-cooled heat exchanger that replaces the outdoor heat exchanger, and an instant heat exchange type refrigerant heating heat exchanger that is connected to a boiler in a double-pipe type that allows refrigerant gas to flow inside and hot water to flow outside. One electric three-way valve is installed between these heat exchangers and the heating expansion valve, and during heating, this electric three-way valve either flows the refrigerant to the refrigerant heating heat exchanger side or air-cooling heat exchanger. A No. 2 solenoid valve that opens and closes the flow to the air-cooled heat exchanger and a No. 1 solenoid valve that bypasses the air-cooled heat exchanger are installed at the air-cooled heat exchanger side port. A heating and cooling system consisting of a heat exchanger for heating refrigerant and a boiler for heating and hot water supply.