JP3326322B2 - Air conditioner and air conditioner system equipped with this air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a first heat exchanger as an air heat source and a second heat exchanger for heating a refrigerant.

[0002]

2. Description of the Related Art In a cold region such as Hokkaido, a so-called "heat pump type air conditioner" using an air heat source for heating may not provide a sufficient heating effect. Therefore, there has been proposed an air conditioner in which a device that heats a refrigerant with a boiler or the like and serves as a heat source for heating is incorporated in the “heat pump type air conditioner” (Japanese Utility Model Publication No. 6-33296).
Reference).

[0003]

Here, when the refrigerant is directly heated by the boiler, it is necessary to adjust the combustion amount of the boiler in accordance with the air-conditioning load. Increasing the cost is unavoidable if it is incorporated into an air conditioner. Therefore, an object of the present invention is to incorporate a second heat exchanger for heating a refrigerant into a heat pump type air conditioner while minimizing cost increase.

[0004]

In order to achieve this object, a first invention comprises a first heat exchanger of an air heat source and a second heat exchanger for flowing a fluid such as hot water to heat a refrigerant. Are connected in parallel, a plurality of indoor units connected to the outdoor unit, and a hot water source connected to the second heat exchanger via a circulation pump. During the heating operation, the refrigerant flows into the second heat exchanger while preventing the refrigerant from flowing into the first heat exchanger, and adjusts the amount of fluid of the hot water source flowing into the second heat exchanger. . According to the invention,
Refrigerant heating can be performed in accordance with the number of operating indoor units and the air conditioning load.

A second invention comprises a compressor, an indoor heat exchanger, a pressure reducing device, a second heat exchanger for heating the refrigerant by pouring fluid warm water in the first heat exchanger of the air heat source Are parallel
An air-conditioning system including a heat exchanger group connected to the first heat exchanger during heating operation by a hot water source.
The refrigerant flows into the second heat exchanger while preventing the inflow of the refrigerant.
The compression device is of a variable capacity type and the second
The amount of fluid flowing into the second heat exchanger is variable, and the capacity of the compressor and the amount of fluid flowing into the second heat exchanger are adjusted according to the load in the room. According to the present invention, the capacity of the compression device and the amount of the fluid flowing into the second heat exchanger are controlled according to the indoor load.

[0006]

[0007]

[0008]

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an air conditioning system provided with an air conditioner according to an embodiment of the present invention. The equipment of this system includes one outdoor unit 1, two (a plurality of) indoor units 2a and 2b, It comprises a boiler (hot water source) 3 and a circulation pump 4. 5 is these units 1,
Unit-to-unit piping connecting 2a and 2b, and 6 is a brine piping provided with a circulation pump 7.

The indoor units 2a and 2b include an indoor heat exchanger (not shown), a temperature sensor (not shown) for detecting the temperature of the indoor heat exchanger during heating (condensing temperature during heating), A decompression device (not shown) and indoor sensors 7a and 7b for detecting an indoor air-conditioning load are arranged, respectively. The boiler 3 has a built-in heater (not shown) for heating the brine, and the heated brine flows as indicated by a solid line arrow by the operation of the circulation pump 4. Although the circulation pump 4 is not built in the outdoor unit 1 or the boiler 3, the circulation pump 4 may be built in either one.

The outdoor unit 1 has the following devices built therein. 8 is a compression device, which is connected in parallel 2
It is composed of two compressors 9a and 9b. Here, the compressor 9a is of a constant horsepower type of 6 horsepower, and the compressor 9b is of a variable horsepower type of 4 horsepower. Reference numeral 10 denotes a high-pressure pipe connected to the compressor 9b and having a high-pressure on-off valve 11. The high-pressure pipe in the refrigeration cycle is applied to the compressor 9b by opening the high-pressure on-off valve 11, and the capacity of the compressor 9b is reduced to 4 horsepower. To set. A low-pressure pipe 12 is also provided with a low-pressure on-off valve 13 connected to the compressor 9b. When the low-pressure on-off valve 13 is opened, a low-pressure pressure during the refrigeration cycle is applied to the compressor 9b, and the capacity of the compressor 9b is set to 2 horsepower. Is what you do.

Reference numeral 14 denotes an oil separator, which is provided in the discharge pipe 19, and the separated oil is supplied to the oil pipe 1
5 is returned to the suction pipe 16 of the compressor 9b. Reference numeral 17 denotes a bypass pipe provided with a bypass valve 18 for capacity adjustment, and a suction pipe 2 in front of a discharge pipe 19 and an accumulator 20.
Connected to 1. By opening the bypass valve 18, the refrigerant on the high pressure side in the refrigeration cycle is returned to the low pressure side in the refrigeration cycle, thereby reducing the capacity of the compression device 8 to one.
It reduces horsepower. Reference numeral 22 denotes a four-way valve, which is set to a dashed state during heating and set to a solid line during cooling.

23 is an outdoor heat exchanger (first heat exchanger),
Reference numeral 24 denotes an anti-icing coil disposed below the outdoor heat exchanger 23, which is connected by a refrigerant pipe as shown in the figure. Reference numeral 24 denotes a heating on-off valve which is set to a fully open state when a refrigerant heater (second heat exchanger) described later is used (during a heating operation without using a heat pump) and is set to a fully closed state during a cooling operation. . A cooling on-off valve 25 is set to a fully open state during a cooling operation and a heating operation by a heat pump, and is set to a fully closed state during a heating operation without a heat pump.

Reference numeral 26 denotes a refrigerant heater (second heat exchanger).
The refrigerant is heated by the hot water from the boiler 3. An inlet pipe 27 of the refrigerant pipe of the refrigerant heater 26 is connected to a high-pressure pipe of the refrigeration cycle via an on-off valve 24 for heating, and an outlet pipe 28 is connected to a suction pipe 21 in front of the accumulator 20. Brine inlet pipe 29, second heat exchanger 2
A plurality of control valves (constant flow rate valves) 30 for adjusting the flow amount of the fluid are provided in parallel on the inlet pipe through which the fluid flows into 6. More specifically, even if a large amount of brine (warm water) from the boiler 3 flows, the first constant flow valve 31 is set to 7.
5 L / min of brine is adjusted to flow to the second heat exchanger 26, while the second constant flow valve 32
Is adjusted so that even if a large amount of brine (warm water) flows from the boiler 3, 4 liters / min of brine flows to the second heat exchanger 26. Reference numeral 33 denotes an opening / closing valve provided on the inlet side of the second constant flow valve 32, the opening and closing of which is controlled by an air conditioning load. That is, 11.5 liters / minute of brine flows to the second heat exchanger 26 by opening the on-off valve 33, and 4 liters / minute of brine flows to the second heat exchanger 26 by closing the on-off valve 33. These configurations are one of the features of the present invention, and the operation and the like will be described later.

Reference numeral 34 denotes a controller of the air conditioning system.
The operating horsepower as the air conditioning system is set by inputting signals from the temperature sensors of the indoor units 2a and 2b and the indoor sensors 7a and 7b. Depending on this set driving horsepower,
By setting the capacity of the compression device 8 and the opening / closing state of the bypass valve 18 of the bypass pipe 17 as shown in FIG. 2, the capacity is set in units of one horsepower.

Here, during the cooling operation, the refrigerant discharged from the compressor 8 flows as shown by the solid arrow in FIG. 1, and the indoor heat exchanger (not shown) acts as an evaporator. At this time,
The cooling on-off valve 25 is set to the fully open state, the heating on-off valve 24 is set to the fully closed state, and the use of the second heat exchanger 26 is stopped. On the other hand, during the heating operation, the refrigerant discharged from the compression device 8 flows as indicated by the dashed arrow in FIG. 1, and the indoor heat exchanger (not shown) acts as a condenser. At this time, if it is determined that the outside air temperature is equal to or higher than the predetermined temperature and a sufficient heating capacity can be obtained even in the heat pump operation, the cooling on-off valve 25 is fully opened as in the cooling operation by a signal from the controller 34, The on-off valve 24 is set to the fully closed state, and the second heat exchanger 2
Stop using 6. However, if the outside air temperature is lower than the predetermined temperature and it is determined that sufficient heating capacity cannot be obtained by the heat pump operation, the cooling on-off valve 2
5 is set to a fully closed state, the heating on-off valve 24 is set to a fully open state, and the boiler 3 and the circulation pump 4 are operated. Thereby, the refrigerant is heated in the second heat exchanger 26, and as a result, the hot water (brine) heated in the boiler 3 becomes a heat source.

The present invention is characterized by an operating state when the outside air temperature is lower than a predetermined temperature and a sufficient heating capacity cannot be obtained by the heat pump operation. First, each indoor unit 2a, 2b
And input signals from the indoor temperature sensors 7a and 7b to set the operating horsepower as the air conditioning system.
According to the set operating horsepower, the compressor 8 and the bypass valve 18 of the bypass pipe 17 are set to the open / closed state as shown in FIG. At the same time, the open / close state of the on-off valve 33 depends on the number of operating indoor units 2a and 2b and the operating indoor unit 2
Fig. 3 in relation to the condensation temperature of a and 2b (condensing temperature during heating)
It becomes as shown by. That is, when the number of operating indoor units 2a and 2b is small and the condensing temperature is equal to or higher than the predetermined temperature, it is determined that a sufficient amount of refrigerant is heated by the brine, and the on-off valve 33 is closed. This causes 4 liters / min of brine to flow into the second heat exchanger 26.

On the other hand, when the number of operating indoor units 2a and 2b is large and the condensing temperature is equal to or lower than the predetermined temperature, it is determined that a sufficient amount of refrigerant is not heated by the brine, and the on-off valve 33 is opened. This causes 11.5 liters / min of brine to flow into the second heat exchanger 26. As described above, the capacity of the compression device 8 and the second heat exchanger 2 are determined in accordance with the number of operating indoor units 2a and 2b and the condensing temperature (air conditioning load).
Adjust the amount of brine flowing into 6. Therefore, the capacity of the compression device 8 and the heating amount of the refrigerant that match the air conditioning load can be obtained.

As shown in FIG. 4, a three-way valve 40 is provided in the inlet pipe 29 of the brine, and one of the outlet pipes 41 is connected so as to bypass the second heat exchanger 26 so as to be connected to the second heat exchanger 26.
When a sufficient amount of refrigerant to be heated in the heat exchanger 26 is obtained, the brine may be caused to flow through the one outlet pipe 41 to bypass the second heat exchanger 26. Further, FIG.
As shown in the figure, a bypass pipe 51 for bypassing a part 50 of the second heat exchanger 26 is provided, and when a sufficient amount of refrigerant is heated in the second heat exchanger 26, the bypass pipe 51 is provided.
May be opened so that the brine does not pass through a part 50 of the second heat exchanger 26.

As shown in FIG. 6, heat exchangers 60 and 6 corresponding to the second heat exchanger 26 in the above embodiment.
1 and 62 are divided into a plurality, and a pair of on-off valves 63a and 63
The b, 64a and 64b may be controlled to open and close so that the brine flows only to the necessary heat exchanger.

[0021]

The first invention provides an outdoor unit in which a first heat exchanger of an air heat source and a second heat exchanger for flowing a fluid such as hot water and heating a refrigerant are connected in parallel; In an air conditioning system composed of a plurality of indoor units connected to the first heat exchanger and a hot water source connected to the second heat exchanger via a circulation pump, during the heating operation using the hot water source, the air conditioner is connected to the first heat exchanger. Since the refrigerant flows into the second heat exchanger while preventing the flow of the refrigerant, and the amount of the fluid of the hot water source flowing into the second heat exchanger is adjusted, the number of operating indoor units and the number of air conditioners are controlled. The refrigerant can be heated according to the load.

According to a second aspect of the present invention, there is provided a compression device, an indoor heat exchanger, a decompression device, a first heat exchanger of an air heat source, and a second heat exchanger for flowing a fluid such as hot water to heat a refrigerant. And a heat exchanger group connected in parallel in the air-conditioning system, the refrigerant flows into the second heat exchanger while preventing the refrigerant from flowing into the first heat exchanger during the heating operation by the hot water source. The compression device is of a variable capacity type, and
The amount of fluid flowing into the heat exchanger is variable, and the capacity of the compressor and the amount of fluid flowing into the second heat exchanger are adjusted according to the indoor load. The amount of fluid flowing into the heat exchanger is controlled according to the indoor load.

[0023]

[0024]

[0025]

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioning system of the present invention.

FIG. 2 is an explanatory diagram showing an operation state of the compression device shown in FIG.

FIG. 3 is an explanatory diagram showing an open / closed state of the on-off valve shown in FIG. 1;

FIG. 4 is a main part refrigerant circuit diagram showing an invention different from the refrigerant circuit diagram shown in FIG. 1;

FIG. 5 is a main part refrigerant circuit diagram showing an invention different from the refrigerant circuit diagram shown in FIG. 4;

6 is a main part refrigerant circuit diagram showing an invention different from the refrigerant circuit diagram shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outdoor unit 2a, 2b Indoor unit 3 Boiler 4 Circulation pump 8 Compressor 23 1st heat exchanger 26 2nd heat exchanger 30 Control valve

Claims (2)

(57) [Claims] 1. A first heat exchanger of an air heat source and a second heat exchanger for flowing a fluid such as hot water and heating a refrigerant are connected in parallel.
In an air conditioning system including a connected outdoor unit, a plurality of indoor units connected to the outdoor unit, and a hot water source connected to the second heat exchanger via a circulation pump, a heating operation using a hot water source is performed. Is the first heat
To the second heat exchanger while preventing the refrigerant from flowing into the exchanger
The temperature at which the refrigerant flows in and flows into the second heat exchanger
An air conditioning system characterized by adjusting the amount of fluid in a water source . 2. A compressor, an indoor heat exchanger, a decompression device, a first heat exchanger of an air heat source, and a second heat exchanger for flowing a fluid such as hot water and heating a refrigerant are connected in parallel. Was
An air conditioning system comprising a heat exchanger group, hot water
During the heating operation by the source, the refrigerant flows into the first heat exchanger
The refrigerant is allowed to flow into the second heat exchanger while preventing the pressure from flowing, the compression device is of a variable capacity type, and the amount of fluid flowing into the second heat exchanger is variable, and the compression is performed according to the indoor load. An air conditioning system characterized by adjusting the capacity of the device and the amount of fluid flowing into said second heat exchanger.