JP3723402B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner including a hot water supply unit.
[0002]
[Prior art]
In general, a refrigerant, a heat source side unit provided with a heat source side heat exchanger, a use side unit provided with a use side heat exchanger, and a hot water supply unit provided with a heat exchanger for hot water supply are connected by a refrigerant pipe, 2. Description of the Related Art An air conditioner configured to enable heating operation and hot water storage operation by a heat pump method is known.
[0003]
This type includes a high pressure protection device that stops the operation of the compressor when the high pressure in the refrigerant pipe reaches a predetermined pressure value.
[0004]
By the way, at the time of heating operation, the condensation temperature of the refrigerant is generally set to about 55 ° C. This is because warm air has a property of rising upward, so that even if the condensation temperature is set too high, the heating effect on the human being in the living area is not enhanced so much and the energy required for heating is wasted.
[0005]
Therefore, conventionally, the predetermined pressure value as the high pressure cut is set to a pressure value corresponding to a condensation temperature of about 55 ° C.
[0006]
[Problems to be solved by the invention]
However, considering the heat storage operation for hot water supply, the heat storage temperature for hot water supply needs to be 42 ° C. or higher, and when the heat storage tank is designed to be compact, the heat storage temperature for hot water supply further rises and is preferably 60 ° C. or higher.
[0007]
In this case, the refrigerant condensing temperature needs to be 60 ° C. or higher. However, as described above, when the heating operation is considered, when the refrigerant condensing temperature is 60 ° C. or higher, the energy required for heating is wasted. .
[0008]
Therefore, an object of the present invention is made in consideration of the above-described circumstances, and provides an air conditioner that increases the heat storage temperature for hot water supply and does not waste energy even during heating operation. is there.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a refrigerant comprising a compressor, a heat source side unit provided with a heat source side heat exchanger, a use side unit provided with a use side heat exchanger, and a hot water supply unit provided with a hot water supply heat exchanger. In an air conditioner configured to be connected by piping and capable of heating operation and hot water storage heat storage operation, a high pressure protection device that stops the operation of the compressor when the high pressure in the refrigerant pipe reaches a predetermined pressure value. And a control device that sets the predetermined pressure value during the hot water storage heat storage operation to be higher than the predetermined pressure value during the heating operation .
[0011]
In these inventions, since the control device that changes the predetermined pressure value according to the heating operation mode and the hot water heat storage operation mode is provided, for example, the predetermined pressure value during the hot water heat storage operation is set to be higher than the predetermined pressure value during the heating operation. By setting it high, the heat storage temperature for hot water supply can be raised, and energy required for heating is not wasted even during heating operation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
In FIG. 1, reference numeral 1 denotes an outdoor unit (heat source side unit). The outdoor unit 1 includes a compressor 2, a four-way valve 3, an air-cooled outdoor heat exchanger (heat source side heat exchanger) 4 that performs a heat exchange operation by an outdoor fan (not shown), an outdoor expansion valve 5, and a receiver. A liquid vessel 6 and a gas-liquid separation device 7 are built in, and these devices are connected by piping.
[0014]
8 is a liquid side connection port connected to the liquid pipe 10 constituting the inter-unit pipe 9, and 11 is a gas side connection port connected to the gas pipe 12 constituting the inter-unit pipe 9. Reference numeral 12 denotes a discharge dedicated port, which is connected to a discharge dedicated pipe 13 branched from the discharge pipe of the compressor 2. Reference numeral 14 denotes a suction dedicated port, which is connected to a suction dedicated pipe 15 branched from the suction pipe of the compressor 2. In this way, the discharge dedicated port 12 (discharge dedicated pipe 13) and the suction dedicated port 14 (suction dedicated pipe 15) are connected to the liquid pipe 10 and the gas pipe 12 constituting the inter-unit pipe 9, and on the liquid and gas side. The connection ports 8 and 11 are provided separately.
[0015]
An indoor unit (use side unit) 16, a heat storage unit 19, and a hot water supply unit 28 are connected to the outdoor unit 1.
[0016]
The indoor unit 16 includes an indoor heat exchanger 17 and an indoor expansion valve 18. The heat storage unit 19 includes a heat storage heat exchanger 20 and has first to third connection ends. The first connection end 21 includes a first on-off valve 22 and a check valve 23. Through the second open / close valve 25 to the heat storage heat exchanger 20, and the third connection end 26 through the heat storage side expansion valve 27 for heat storage. Each is connected to the heat exchanger 20.
[0017]
The first connection end 21 is connected to the discharge exclusive port 12 of the outdoor unit 1 and communicates with the discharge exclusive pipe 15. The second connection end 24 is connected to the suction dedicated port 14 of the outdoor unit 1 and communicates with the suction dedicated piping 15. The third connection end 26 is connected to the liquid pipe 10 of the inter-unit pipe 9.
[0018]
The hot water supply unit 28 includes a hot water supply heat exchanger 29, and has an inlet end 30 and an outlet end 31, and the inlet end 30 is connected to the hot water supply heat exchanger 29 via an on-off valve 32 and a check valve 33. In addition, the outlet end 31 is connected to a heat exchanger 29 for hot water supply. The inlet end 30 is connected to the discharge exclusive port 12 of the outdoor unit 1 and communicates with the discharge exclusive pipe 13. The outlet end 31 is connected to the liquid pipe 10 of the inter-unit pipe 9.
[0019]
Reference numeral 34 denotes a heat storage tank connected to the hot water supply unit 28 via a pump 35, and stores hot water heated by the hot water supply heat exchanger 29. A hot water outlet 36 is connected to the heat storage tank 34 via a pump 37.
[0020]
In the air conditioning system having such a configuration, ice storage is performed while storing heat for hot water supply by using the heat storage unit 19 and the hot water supply unit 28 by stopping the cooling operation in summer night or the like.
[0021]
That is, the refrigerant discharged from the compressor 2 is stored in the check valve 38, the open / close valve 32 of the hot water supply unit 28, the check valve 33, the hot water heat exchanger 29, and the heat storage unit 19 as shown by the solid arrows in FIG. The side expansion valve 27, the heat storage heat exchanger 20, the second on-off valve 25 of the heat storage unit 19, the gas-liquid separator 7, and the compressor 2 are repeatedly circulated. Thus, the hot water supply heat exchanger 29 functions as a condenser and the heat storage heat exchanger 20 functions as an evaporator. Hot water heated by the hot water supply heat exchanger 29 is fed into the heat storage tank 34. The ice heat storage generated by the heat storage heat exchanger 20 is stored as it is.
[0022]
Here, for example, when the heat storage by the hot water supply unit 28 is completed early, the open / close valve 32 of the hot water supply unit 28 is closed, and the refrigerant discharged from the compressor 2 is indicated by a broken line arrow, as shown by the check valve 38 and the four-way valve 3. , Outdoor heat exchanger 4, outdoor expansion valve (fully open) 5, liquid receiver 6, heat storage side expansion valve 27 of heat storage unit 19, heat storage heat exchanger 20, second on-off valve 25, gas-liquid separator 7, It circulates repeatedly to return to the compressor 2. Thus, the outdoor heat exchanger 4 functions as a condenser and the heat storage heat exchanger 20 functions as an evaporator. In other words, it can store ice with air cooling.
[0023]
On the other hand, when the ice heat storage by the heat storage unit 19 is completed early, the heat storage side expansion valve 27 of the heat storage unit 19 is set to be fully closed so that the refrigerant discharged from the compressor 2 is indicated by a one-dot broken line arrow. 38, first open / close valve 32 of hot water supply unit 28, check valve 33, heat exchanger 29 for hot water supply, receiver 6 of outdoor unit 1, outdoor expansion valve 5, outdoor heat exchanger 4, four-way valve 3, air The liquid is repeatedly circulated so as to return to the liquid separator 7 and the compressor 2. Accordingly, the hot water supply heat exchanger 29 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator. Thus, ice heat storage and heat storage for hot water supply can be performed simultaneously with inexpensive electric power at night.
[0024]
The cooling operation is performed during summer daytime in a state where the ice heat storage and the heat storage for hot water supply can be performed by the above-described operation.
[0025]
That is, during the cooling operation using the heat storage unit 19, the refrigerant discharged from the compressor 2 is the check valve 38, the first on-off valve 22 of the heat storage unit 19, and the heat storage heat exchange as shown by the solid line arrow in FIG. 2. It circulates repeatedly so as to return to the vessel 20, the heat storage side expansion valve 27, the indoor side expansion valve 18, the indoor heat exchanger 17, the four-way valve 3, the gas-liquid separator 7, and the compressor 2. Thus, the heat storage heat exchanger 20 functions as a condenser and the indoor heat exchanger 17 functions as an evaporator, thereby cooling the room.
[0026]
Here, when the heat of the heat storage unit 19 has been used up, the first on-off valve 22 and the heat storage side expansion valve 27 are closed to stop the use of the heat storage unit 19. Thereby, the refrigerant discharged from the compressor 2 is, as indicated by broken line arrows, the check valve 38, the four-way valve 3, the outdoor heat exchanger 4, the outdoor expansion valve 5, the liquid receiver 6, and the indoor expansion valve 18. The air is repeatedly circulated so as to return to the indoor heat exchanger 17, the four-way valve 3, the gas-liquid separator 7, and the compressor 2. Thus, it is thought that about 40% of power consumption can be saved by the combined use of ice heat storage and air-cooled heat exchanger (outdoor heat exchanger). Needless to say, hot water can be supplied by opening the outlet 36 during the cooling.
[0027]
On the other hand, in winter nights, the heating operation is stopped and the heat storage unit 19 and the hot water supply unit 28 are used to store hot water for hot water and then to store hot water.
[0028]
That is, the refrigerant discharged from the compressor 2 is, as shown by solid line arrows in FIG. 3, the check valve 38, the open / close valve 32 of the hot water supply unit 28, the check valve 33, the hot water supply heat exchanger 29, and the outdoor unit 1. Are repeatedly circulated so as to return to the liquid receiver 6, the outdoor expansion valve 5, the outdoor heat exchanger 4, the four-way valve 3, the gas-liquid separator 7, and the compressor 2.
[0029]
Thus, the hot water supply heat exchanger 29 functions as a condenser and the outdoor heat exchanger 4 functions as an evaporator, and the hot water heated by the hot water supply heat exchanger 29 is fed into the heat storage tank 34. If heat storage by the hot water supply unit 28 is sufficiently performed by this operation, the operation is then switched to hot water heat storage.
[0030]
That is, the refrigerant discharged from the compressor 2 is, as shown by broken line arrows in FIG. 3, the check valve 38, the first on-off valve 22 of the heat storage unit 19, the check valve 23, the heat storage heat exchanger 20, and the outdoor unit. 1 circulates repeatedly so as to return to the liquid receiver 6, the outdoor expansion valve 5, the outdoor heat exchanger 4, the four-way valve 3, the gas-liquid separator 7, and the compressor 2.
[0031]
By the above-described operation, heat storage for hot water supply and hot water storage are performed during winter night, and heating operation is performed using the warm water storage during winter daytime.
[0032]
That is, during the heating operation using the heat storage unit 19, the refrigerant discharged from the compressor 2 is the check valve 38, the four-way valve 3, the indoor heat exchanger 17, the indoor expansion valve as shown by the solid line arrows in FIG. 18, and repeatedly circulates back to the heat storage side expansion valve (full open) 27 of the heat storage unit 19, the heat storage heat exchanger 20, the second on-off valve 25, the gas-liquid separator 7, and the compressor 2. Thus, the indoor heat exchanger 17 acts as a condenser and the heat storage heat exchanger 20 acts as an evaporator, thereby heating the room.
[0033]
Here, although the heating operation using the heat storage unit 19 is determined by the heat energy of the heat storage unit 19, it is considered to be about 10 hours. Therefore, when the heating operation using the heat storage unit 19 exceeds 10 hours, the heat storage side expansion valve 27 is closed and the use of the heat storage unit 19 is stopped.
[0034]
As a result, the refrigerant discharged from the compressor 2 passes through the check valve 38, the indoor heat exchanger 17, the indoor expansion valve 18, the receiver 6 of the outdoor unit 1, the outdoor side, as indicated by the broken line arrows in FIG. Circulation is repeated so as to return to the expansion valve (fully open) 5, the outdoor heat exchanger 4, the four-way valve 3, the gas-liquid separator 7, and the compressor 2.
[0035]
Thereby, the indoor heat exchanger 17 acts as a condenser and the outdoor heat exchanger 14 acts as an evaporator, thereby heating the room. Thus, indoor heating is performed by using heat storage and an air-cooled heat exchanger (outdoor heat exchanger 14) in combination. Needless to say, hot water can be supplied by opening the hot water outlet 36 during the heating.
[0036]
In the present embodiment, as shown in FIG. 4, when the pressure sensor 51 is provided in the discharge pipe of the compressor 2, and the high pressure in the refrigerant pipe detected by the pressure sensor 51 reaches a predetermined pressure value, the compressor A high-pressure protection device 52 for stopping the operation of No. 2; A so-called high pressure cut is performed.
[0037]
And the control apparatus 53 which changes the said predetermined pressure value according to heating operation mode and the hot water storage heat storage operation mode is provided.
[0038]
FIG. 5 shows a processing flow of the present embodiment.
[0039]
When this air conditioner is operated, it is first determined whether or not it is in the heating operation mode (see FIG. 4) (S1).
[0040]
In the heating operation mode, the predetermined pressure value for high-pressure cut is set to the first pressure value P1 targeting the refrigerant condensation temperature of 55 ° C. (S2). If it is not the heating operation mode, it is determined whether or not the hot water storage heat storage operation mode (see FIG. 3) (S3). And if it is the heat storage operation mode for hot water supply, the said predetermined pressure value for a high pressure cut will be set to the 2nd pressure value P2 which aimed at the condensation temperature 60 degreeC of a refrigerant | coolant (S4).
[0041]
Since warm air has the property of rising upwards, in the heating operation mode, even if the refrigerant condensing temperature is set to 55 ° C. or higher, the heating effect on the human being in the living area is not enhanced so much, and the energy required for heating is increased. Is wasted. Therefore, in the heating operation mode, the predetermined pressure value is set lower. That is, it is set to the first pressure value P1 targeting a lower refrigerant condensing temperature of 55 ° C. According to this, energy required for heating is not wasted.
[0042]
On the other hand, in consideration of the hot water storage heat storage operation mode, the hot water storage temperature needs to be 42 ° C or higher. When the heat storage tank 34 is designed to be compact, the hot water storage temperature further increases to 60 ° C or higher. desirable. In this case, the refrigerant condensing temperature needs to be 60 ° C. or higher.
[0043]
In the present embodiment, in the hot water heat storage operation mode, the predetermined pressure value is set to the second pressure value P2 targeting a higher refrigerant condensing temperature of 60 ° C.
[0044]
According to this, since the high heat storage temperature for hot water supply is obtained, the heat storage tank 34 can be designed compactly.
[0045]
As mentioned above, although this invention was demonstrated based on one Embodiment, it is clear that this invention is not limited to this.
[0046]
【The invention's effect】
In the present invention, since the control device that changes the predetermined pressure value according to the heating operation mode and the hot water storage heat storage operation mode is provided, for example, the predetermined pressure value during the hot water storage heat storage operation is higher than the predetermined pressure value during the heating operation. By setting, the heat storage temperature for hot water supply can be raised, and energy required for heating is not wasted even during heating operation.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit showing an operation state in summer night according to the present invention.
FIG. 2 is a refrigerant circuit showing a summer day driving state according to the present invention. FIG. 3 is a refrigerant circuit showing a winter night driving state according to the present invention.
FIG. 4 is a refrigerant circuit showing a winter daytime operating state according to the present invention.
FIG. 5 is a flowchart according to the present invention.
[Explanation of symbols]
1 Outdoor unit (heat source side unit)
2 Compressor 4 Outdoor heat exchanger (heat source side heat exchanger)
16 Indoor unit (use side unit)
17 Indoor heat exchanger (use side heat exchanger)
19 heat storage unit 20 heat storage heat exchanger 28 hot water supply unit 29 hot water heat exchanger 51 pressure sensor 52 high pressure protection device 53 control device

Claims (1)

Heating operation by connecting a compressor, a heat source side unit equipped with a heat source side heat exchanger, a use side unit equipped with a use side heat exchanger, and a hot water supply unit equipped with a heat exchanger for hot water supply through a refrigerant pipe In the air conditioner configured to enable the heat storage operation for hot water supply,
When the high pressure in the refrigerant pipe reaches a predetermined pressure value, the high pressure protection device for stopping the operation of the compressor,
A controller that sets the predetermined pressure value during the hot water storage heat storage operation higher than the predetermined pressure value during the heating operation ;
An air conditioner characterized by that.

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