JPH0432307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heat pump water heater.

[Prior art]

An example of a conventional air source heat pump water heater is shown in Fig. 1. In the figure, 1 is a compressor for hot water supply, 2 is a condenser for hot water supply, 3 is an expansion mechanism, and 4 is an evaporator equipped with an air blower 5. These are successively connected by refrigerant piping to form a heat pump circuit. and,
Solid arrows indicate the flow of refrigerant.

6 is a hot water storage tank, and 7 is a water supply port provided at the bottom of the hot water storage tank 6, which is connected to the hot water storage tank 6 via a city water pipe 8 and a pressure reducing check valve 9. A hot water supply port 10 is provided at the top of the hot water storage tank 6, and is connected to a hot water tap 12 via a hot water supply pipe 11.

13 is a circulating water outlet provided at the bottom of the hot water storage tank 6, 14 is a circulating water return port provided at the top of the hot water storage tank 6, and 15 is a circulation pump, which is connected to the hot water supply condenser 2 through a water pipe. 16 is a heater attached to the lower part of the hot water storage tank 6.

Next, FIG. 2 shows an example of an operation control circuit for each component shown in FIG. 1 above. In the figure, 1
8 is a hot water supply operation switch; 19 is a thermostat that detects the water temperature in the hot water storage tank 6; 20 is a thermostat that switches from heat pump operation to heater operation; 21 is a heater circuit corresponding to heater 16;
22 is a hot water supply compressor motor circuit corresponding to the hot water supply compressor 1; 23 is a blower motor circuit corresponding to the blower 5; and 24 is a pump motor circuit corresponding to the circulation pump 15.

Next, the operation will be explained. First, when the hot water supply operation switch 18 is closed, the thermostat 19 is closed, and the thermostat 20 is connected to the B contact side as shown in FIG. In the following cases, the hot water supply compressor motor circuit 22, the blower motor circuit 23, and the pump motor circuit 24 operate to perform heat pump operation. As a result, the high-temperature, high-pressure refrigerant gas (Freon 12) discharged from the hot water supply compressor 1 exchanges heat with the hot water supplied by the circulation pump 15 from the lower part of the hot water storage tank 6 in the hot water condenser 2, and the hot water is heated, condenses and liquefies itself, is depressurized by the expansion mechanism 3, takes heat from the air in the evaporator 4, evaporates, and returns to the hot water supply compressor 1, forming a refrigeration cycle. On the other hand, the hot water side is supplied from a water supply port 7 through a city water pipe 8 and a pressure reducing check valve 9. The hot water filling the hot water storage tank 6 is sent from the circulating water outlet 13 to the hot water supply condenser 2 by the circulating pump 15, heated, and returned to the hot water storage tank 6 through the circulating water return port 14 for circulation. be done. In this way, the hot water in the hot water storage tank 6 is successively circulated and heated to raise its temperature. At this time, the inside of the hot water storage tank 6 has a uniform temperature distribution due to the circulation of hot water. When the temperature continues to rise and the hot water in the hot water storage tank 6 reaches a predetermined temperature or higher, the contacts of the thermostat 20 are switched from the B contact side to the A contact side.
Switched to the contact side, hot water supply compressor motor circuit 2
2. The blower motor circuit 23 and the pump motor circuit 24 are stopped. At the same time, the heater circuit 21 is activated and the heater 16 is energized. When the hot water in the hot water storage tank 6 reaches a predetermined temperature, the thermostat 1
9 is opened and the heater circuit 21 is stopped.

The conventional air source heat pump type water heater is configured as described above. Therefore, in winter when the outside temperature is low (for example, below 0° C.), the amount of heat extracted from the air is small, so the evaporation pressure is low and the hot water supply capacity is low. In addition, when trying to obtain high-temperature hot water, the condensing pressure increases, the compression ratio (=condensing pressure/evaporation pressure) of the hot water supply compressor 1 becomes 8 or more, and the temperature of the refrigerant gas discharged from the hot water supply compressor 1 increases. increases (e.g.
(130°C or higher) This has a significant impact on the reliability and lifespan of the hot water supply compressor 1, so measures such as stopping the operation of the compressor 1 and raising the temperature using an auxiliary heat source (for example, an electric heater) as an alternative. was taken.
However, this worsened the efficiency (coefficient of performance) of the equipment. In addition, since it is an air source heat pump type, when the outside temperature is high in summer, the hot water supply capacity is large.
When the outside temperature is low in winter, the hot water supply capacity is reduced. This is a completely opposite trend to the hot water supply load.
The load is small in the summer when the outside temperature is high, and becomes large in the winter when the outside temperature is low. Therefore, the characteristics of the equipment and the load cannot be balanced, and when selecting a model,
Equipment with a fairly large capacity was required.

[Summary of the invention]

This invention was made for the purpose of improving the above-mentioned drawbacks, and is configured so that the water-side heat exchanger of an air-source heat pump chiller and the evaporator of a water-source heat pump water heater are brought into thermal contact with each other. To provide a heat pump type air-conditioning/heating water heater that can efficiently produce hot water at a high temperature without a heat source device (for example, an electric heater), and can also perform air-conditioning/heating.

[Embodiments of the invention]

Normally, in a single-stage refrigeration cycle, when the difference between the condensing temperature and the evaporation temperature increases, especially when the hot water temperature increases, the coefficient of performance (C・O・P) of the refrigeration cycle increases.
becomes worse. This is because the compression ratio of the compressor increases and the volumetric efficiency decreases.

For example, for the case where the hot water temperature is 67℃ and the outside temperature is 0℃, there is a case where a single-stage compression air source heat pump teller is used, and a dual refrigeration, that is, an air source heat pump chiller on the lower stage and a water source heat pump water heater on the higher stage. Let's compare the volumetric efficiency of the compressor when the heat of condensation on the low stage side is taken as the amount of heat collected on the high stage side. Figure 3 shows the relationship between the compression ratio and volumetric efficiency of a reciprocating compressor.
A Mollier diagram showing the operating characteristics of each method is also shown. In case of single stage system (refrigerant Freon 22
(use), high pressure 32Kg/cm ² abs low pressure 4Kg/cm ² abs The compression ratio is 8, and the volumetric efficiency is 42%. In the case of dual refrigeration system, low stage side (using refrigerant R-22), high pressure 14Kg/
cm ² abs low pressure 4Kg/cm ² abs compression ratio 3.5, volumetric efficiency 72%, high stage side (using refrigerant Freon 12), high pressure 20
Kg/cm ² abs low pressure is 6.6 Kg/cm ² abs compression ratio is 3, and volumetric efficiency is 75%. Based on these volumetric efficiencies, the theoretical heating values C, O, and P seen from the respective Mollier diagrams exceed 1.4 for the single-stage system and 2 for the binary refrigeration system, and the binary refrigeration system is better. Good efficiency.

An embodiment of the heat pump type air-conditioning/heating water heater according to the present invention is shown in FIG. In the figure, 1 is a compressor for hot water supply, 2 is a condenser for hot water supply, 3 is an expansion mechanism, 25 is a water side heat exchanger that shares the water circuit with the refrigeration cycle for air conditioning to create hot and cold water for air conditioning, and 26 is an accumulator. These are sequentially connected via refrigerant piping to form a water heat source heat pump circuit. 27 is a crankcase heater attached to the hot water supply compressor 1, and 28 is a crankcase heater attached to the accumulator 26. And solid arrows indicate the flow of refrigerant.
Reference numeral 6 denotes a water supply port provided at the bottom of the hot water storage tank 6, which is connected to the hot water storage tank 6 via a city water pipe 8 and a pressure reducing check valve 9. 10 is a hot water supply port provided at the top of the hot water storage tank 6, and the hot water supply pipe is connected to the hot water tap 12 through 11.
is connected to.

13 is a circulating water outlet provided at the bottom of the hot water storage tank 6, 14 is a circulating water return port provided at the top of the hot water storage tank 6, 15 is a circulation pump, and these are connected to the hot water supply condenser 2 by a water pipe.

29 is an air conditioning compressor, 30 is a four-way valve, 31 is an expansion mechanism, 32 is an air side heat exchanger equipped with a blower 33, and these and the water side heat exchanger are successively connected by refrigerant piping to form an air source heat pump circuit. It consists of The solid arrows indicate the flow of refrigerant during heating, and the dashed arrows indicate the flow of refrigerant during cooling.

34 is an air conditioning circulation pump, 35 is a radiator equipped with a three-way valve 36, and these and the water side heat exchanger 25 are successively connected by water piping to form an air conditioning water circuit. The white arrows indicate the flow of cold and hot water.

Next, FIG. 5 shows an embodiment of the operation control circuit for each component shown in FIG. 4 above. 18 in the figure
19 is a hot water supply operation switch, 19 is a thermostat that detects the water temperature in the hot water storage tank 6 and opens a contact when it reaches a predetermined temperature, 22 is a hot water supply compressor motor circuit corresponding to the hot water supply compressor 1, and 24 is a circulation pump. 1
Pump motor circuit corresponding to 5, 37 is a timer that controls the operating time of the device, 38 is an output contact of timer 37, 39 is an auxiliary relay, 40a ₁ , 40a ₂ is an output contact of auxiliary relay 39, 41 is during heating operation Detects the temperature of hot water for air conditioning, closes when it exceeds a predetermined value,
A thermostat that controls the hot water supply compressor motor 22, 42 an auxiliary relay, 43 an output contact of the auxiliary relay 42, 44 a thermostat that senses the outside temperature, 45 that senses the water temperature of the air conditioning water circuit, and 45 the air conditioning water circuit. thermostat that controls the heating operation of
The thermostat 46 has a higher set value than the thermostat 45 and senses the water temperature in the air conditioning water circuit and controls the heating operation of the air conditioning water circuit. 47 is an auxiliary relay, and 48a ₁ , 48a ₂ , 49b ₁ , 49a ₂ are auxiliary relays. Output contact of relay 47, 50 is a delay timer, 51 is an output time limit contact of delay timer 50, 52 is an air conditioning operation switch, 53 is an auxiliary relay, 54a ₁ , 54a ₂ , 5
5, 56 are output contacts of the auxiliary relay 53, 57 are auxiliary relays, 58 are output contacts of the auxiliary relay 57, 5
9 is an air conditioning/heating selector switch, 60 is an auxiliary relay, 6
1a ₁ , 61a ₂ , 63c ₁ , 63c ₂ are auxiliary relays 60
output contact, 64 is an anti-freezing thermostat which has a lower set value than the thermostat 45 and which detects the refrigerant temperature in the air conditioning refrigerant circuit and is activated only during cooling operation; 65 is an auxiliary relay; 66 is an auxiliary relay 65;
67 is a pump motor circuit corresponding to the air conditioning circulation pump 34, 68 is a thermostat that detects the temperature of the air conditioning cold water and controls the cooling operation,
A thermostat 69, which has a higher set value than the thermostat 45, detects the temperature of hot water for air conditioning and controls the heating operation, and has a higher set value than the thermostat 41. 70 is an air conditioning compressor motor circuit corresponding to the air conditioning compressor 29, 71 is a blower motor circuit corresponding to the blower 33, and 72 is a coil of the four-way valve 30.

Next, the operation will be explained.

First, the case where the hot water supply operation switch 18 is closed and the air conditioning operation switch 52 is connected to the off side, that is, the hot water storage heating operation mode will be described. When the hot water storage heating operation period comes, timer 37
Due to this action, the contact 38 is closed. At this time, if the water temperature in the hot water storage tank 6 is below a predetermined water temperature, the thermostat 19 is closed, the auxiliary relay 39 is energized, the contact _40a1 is closed, and the pump motor circuit 24 is activated. The auxiliary relay 65 is energized at the same time as the power is turned on, and the contacts 66 are closed. Further, the auxiliary relay 39 is energized and the contact 40a ₂ is closed, so the auxiliary relay 53 is energized and the contact 54 is closed.
a ₁ and 54a ₂ are closed, the contact 55 is open, and the contact 56 is connected to the a side, and the antifreeze thermostat 64 for cooling is short-circuited at the contact 54a ₂ .

Further, since the contact 55 is open, the operation of the air conditioning compressor motor circuit 70 and the blower motor circuit 71 is controlled by opening and closing the contact _48a1 . At this time, if the cooling/heating changeover switch 59 is connected to the warm side contact, the auxiliary relay 60 is energized and the contact 61
A ₁ and 61a ₂ are open, contacts 63c ₁ and 63c ₂ are connected to the a side, and the antifreeze thermostat 64 for cooling is short-circuited at the contact 61a ₁ .

When the contact 54a ₁ is closed, the auxiliary relay 57 is energized, the contact 58 is connected to the a side, and the air conditioning circulation pump motor circuit 67 is activated. on the other hand,
When the auxiliary relay 47 is de-energized, the contact 49b ₁ is closed, and the hot water supply compressor motor circuit 22 operates to start hot water storage heating operation, and the auxiliary relay 4
2 is energized, the contact 43 is opened, and the crankcase heaters 27 and 28, which were previously energized while the hot water supply compressor motor circuit 22 was stopped, are de-energized. The high-temperature, high-pressure refrigerant sent from the hot water supply compressor 1 exchanges heat with hot water sent from the lower part of the hot water storage tank 6 by the circulation pump 15 in the hot water supply condenser 2, heats it, and condenses itself by heat radiation. ,
The pressure is reduced by the expansion mechanism 3, and the water-side heat exchanger 25 exchanges heat with the cold water sent by the air conditioning circulation pump 34, cools it, collects heat, evaporates, and passes through the accumulator 26 to water for hot water supply. A refrigeration cycle is formed that returns to the compressor 1. On the other hand, water is supplied from a water supply port 7 through a city water pipe 8 and a pressure reducing check valve 9, and a hot water storage tank 6
The hot water filling the hot water tank is sent from the circulating water outlet to the hot water supply condenser 2 by the circulating pump 15, heated, and circulated back to the hot water storage tank 6 through the circulating water return port 14. .

In this way, the water in the hot water storage tank 6 is sequentially circulated and heated to raise its temperature. In addition, for the refrigeration cycle on the hot water supply side, the air conditioning water circuit of the heat source water circuit is sent to the water side heat exchanger 25 by the air conditioning circulation pump 34, cooled by the water side heat exchanger 25, and cooled by the three-way valve 36.
By switching the three-way valve 36, the water bypasses the radiator 35 and returns to the air conditioning circulation pump 34, where the water temperature in the air conditioning water circuit gradually decreases. The thermostat 44, which senses the outside air temperature, is connected to the a-side contact when the outside air temperature is below a set temperature, and connected to the b-side contact when it is above the set temperature. When the thermostat 44 is connected to the a side contact, if the water temperature in the air conditioning water circuit falls below a predetermined water temperature due to heat collection from the hot water supply side refrigeration cycle, the thermostat 4
6 is opened, and the auxiliary relay 47 and delay timer 50 are excited.

When the water temperature of the air conditioning water circuit becomes lower than the predetermined water temperature due to the heat collection of the hot water supply side refrigeration cycle while the thermostat 44 is connected to the b side contact, the thermostat 45 closes and the auxiliary relay 47 and delay timer 50 are activated. Excited. In other words, if the outside temperature is low,
A circuit is formed with a thermostat 46 having a higher setting value than the thermostat 45. Auxiliary relay 4
7 is energized, the contact _49b1 is opened, the hot water supply compressor motor circuit 22 is stopped, and the hot water storage heating operation is immediately stopped. Further, the auxiliary relay 42 is de-energized, the contact 43 is closed, and the crankcase heaters 27 and 28 are energized. On the other hand, when the contact _48a1 is closed, the air conditioning compressor motor circuit 70 and the blower motor circuit 71 operate. At this time contact 48a ₂
is closed and contact 49b ₂ is opened, causing four-way valve 3
The contact 51 of the delay timer 50 closes after a certain period of time after the 0 coil 72 becomes de-energized.
The coil 72 of the four-way valve 30 is energized. As a result, the air conditioning refrigeration cycle performs cooling operation for a certain period of time and then enters heating operation, that is, back-up heating operation of the heat source water of the hot water supply side refrigeration cycle. During cooling operation, the high-temperature, high-pressure refrigerant sent from the air-conditioning compressor 29 is switched in the direction indicated by the broken line arrow by the four-way valve 30, sent to the air-side heat exchanger 32, where it condenses, and is depressurized by the expansion mechanism 31 to become water. It is sent to the side heat exchanger 25 and evaporated, and returns to the air conditioning compressor 29 through the four-way valve 30 to form an air conditioning refrigeration cycle. After a certain period of cooling operation, during back-up heating operation, the four-way valve 30
By switching, the high-temperature, high-pressure refrigerant gas sent from the air conditioning compressor 29 is sent through the four-way valve 30 in the direction indicated by the solid line arrow, and is transferred to the water side heat exchanger 25, where it is transferred to the cold temperature sent by the air conditioning circulation pump 34. It exchanges heat with water, heats it, radiates heat and condenses itself, is depressurized by the expansion mechanism 31, collects heat and evaporates in the air-side heat exchanger 52, and returns to the air conditioning compressor 29 through the four-way valve 30. This back-up heating operation causes the water temperature in the air conditioning water circuit to rise, and if the thermostat 44 that senses the outside air temperature is connected to the b-side contact, when the temperature rises to a temperature at which the thermostat 45 opens, the auxiliary relay 4
7. The delay timer 50 is de-energized and the contact 48a ₁
opens, the air conditioning compressor motor circuit 70 and the blower motor circuit 71 stop operating, and the backup heating operation ends.On the other hand, when the contact _49b1 closes, the hot water supply compressor motor circuit 22 starts operating again. The hot water storage heating operation is started, the auxiliary relay 42 is energized, the contact 43 is opened, and the crankcase heater 27 and the crankcase heater 28 are de-energized. In addition, when the thermostat 44 that senses the outside temperature is connected to the a side contact, when the water temperature in the air conditioning water circuit rises to the temperature at which the thermostat 46 opens, the auxiliary relay 47 and delay timer 50 are de-energized and the contact is opened. 48a ₁ opens, the operation of the air conditioning compressor motor circuit 70 and the blower motor circuit 71 stops, and the backup heating operation ends. On the other hand, when the contact 49b ₁ opens, the hot water supply compressor motor circuit 22 starts operating again. The hot water storage heating operation is started, and the crankcase heater 27 and the crankcase heater 28 are de-energized. As a result of the hot water storage heating operation, the water temperature in the hot water storage tank 6 rises to a predetermined temperature or higher, and the thermostat 19 opens, or the hot water storage heating operation period ends and the timer 37 operates to open the contact 38.
When , the auxiliary relay 39 is de-energized and the contacts 40a ₁ and 40a ₂ are opened. When the contact _40a1 is opened, the pump motor circuit 24 is stopped, the hot water supply compressor motor circuit 22 is stopped, the auxiliary relay 42 is deenergized, the contact 43 is closed, and the crankcase heater 27 and the crankcase are closed. When the heater 28 is energized and the one contact 40a ₂ is opened, the auxiliary relay 53 is deenergized and the contacts 54a ₁ and 54a ₂ are opened, the contact 56 is connected to the b-side contact, and the contact 5
_4a1 is opened, the celadon of the auxiliary relay 57 is melted, the contact 58 is connected to the b side contact, the air conditioning circulation pump motor circuit 67 is stopped, and the hot water storage heating operation is completed. Next, when the hot water supply operation switch 18 is closed, the air conditioning operation switch 52 is connected to the inlet side contact, and the air conditioning/heating selector switch 59 is connected to the warm side contact, that is, hot water storage heating operation and heating operation are performed simultaneously. Let me explain the case. When the power is turned on, the auxiliary relay 65 is energized and the contact 6
6 is closed. When the air conditioning operation switch 52 is connected to the inlet side contact, the auxiliary relay 57 is energized and the contact 58 is connected to the a side contact. Further, when the air conditioning/heating selector switch 59 is connected to the warm side contact, the auxiliary relay 60 is energized and the contacts 61a ₁ and 61a ₂ are closed.
Contacts 63c ₁ and 63c ₂ are each connected to the a-side contact. The antifreeze thermostat 64 is short-circuited by closing the contact _61a1 . When the contact 58 is connected to the a side contact, the air conditioning circulation pump motor circuit 67 is operated, and since the auxiliary relay 53 is de-energized, the contact 55 is closed, and the contact _63c2 is connected to the a side contact. Therefore, if the cold and hot water in the air conditioning water circuit is below the specified water temperature, the thermostat 69
is closed, and the air conditioning compressor motor circuit 70 and the blower motor circuit operate. Further, the contact _61a2 is closed, the coil 72 of the four-way valve 30 is energized, and heating operation is performed. The high-temperature, high-pressure refrigerant gas that exits the air conditioning compressor 29 is switched in the direction of the solid arrow by the four-way valve 30 and sent to the water-side heat exchanger 25, where it is transferred to the air-conditioning cold temperature sent from the air-conditioning circulation pump 34. It exchanges heat with water, heats it, radiates heat and condenses itself, is depressurized by the expansion mechanism 31, takes heat from the atmosphere in the air side heat exchanger 32, evaporates, passes through the four-way valve 30, and returns to the air conditioning compressor 29. , forming a refrigeration cycle. Cold and hot water for air conditioning sent from the air conditioning circulation pump 34 is heated by the water side exchanger 25 and sent to the three-way valve 36. When there is an air conditioning load, the three-way valve 36 sends it to the radiator 35, and when there is no air conditioning load, it is sent to the radiator 35. If so, the radiator 35 is bypassed and the process returns to the air conditioning circulation pump 34. When the cold/hot water in the air conditioning water circuit reaches a predetermined temperature or higher, the thermostat 69 is opened, the air conditioning compressor motor circuit 70 and the blower motor circuit 71 are stopped, and the heating operation is stopped. In this way, the heating operation is controlled by the thermostat 69. If hot water storage heating operation is to be performed at the same time as this heating operation, the hot water supply operation switch 18 is opened, and when the hot water storage heating operation time period is reached, the contact 38 is closed by the operation of the timer 37, and the hot water storage tank 6 is heated. When the temperature of the stored hot water is below a predetermined temperature, the thermostat 19 is closed and the auxiliary relay 39 is energized. This closes the contact 40a ₁ and the pump motor circuit 24 operates. Contact 49b ₁ is closed, contact 63c ₁ is a
The contact 56 is connected to the b side contact, and when the cold/hot water in the air conditioning water circuit is below a predetermined temperature, the thermostat 41 is opened and the hot water supply compressor motor circuit 22 does not operate, that is, the hot water is stored. The heating operation is stopped, and if the cold/hot water in the air conditioning water circuit is at a predetermined temperature or higher, the thermostat 41 is closed and the hot water supply compressor motor circuit 22 is operated to perform hot water storage heating operation. Further, when the hot water supply compressor motor circuit 22 is operating, the auxiliary relay 42 is energized, the contact 43 is opened, and the crankcase heater 27 and the crankcase heater 28 are de-energized. In this way, hot water storage heating operation and heating operation are performed simultaneously.

Next, the hot water supply operation switch 18 is closed, the air conditioning operation switch 52 is connected to the inlet side contact,
The case where the air conditioning/heating changeover switch 59 is connected to the cold side contact, that is, the case where the hot water storage heating operation and the cooling operation are performed at the same time will be described. When the power is turned on, the auxiliary relay 65 is energized and the contacts 66 are closed. When the air conditioning operation switch 52 is connected to the inlet side contact, the auxiliary relay 57 is energized and the contact 58 is connected to the a side contact. Further, when the air conditioning/heating selector switch is connected to the cold side contact, the auxiliary relay 60 is deenergized, the contacts 61a ₁ and 61a ₂ are opened, and the contacts 63c ₁ and
_63c2 are connected to the b-side contacts, respectively.

When the contact 58 connects to the a side contact, the air conditioning circulation pump motor circuit 67 operates, and the auxiliary relay 5
3 is de-energized, the contact 55 is closed, and the contact _63c2 is connected to the b-side contact, so if the cold/hot water in the air conditioning water circuit is at a predetermined water temperature or higher, the thermostat 68 is closed. If so, the air conditioning compressor motor circuit 70 and the blower motor circuit 71
works. Further, the contact _61a2 is opened, the coil 72 of the four-way valve 30 is de-energized, and cooling operation is performed. The high-temperature, high-pressure refrigerant gas that exits the air conditioning compressor 29 is switched in the direction of the dashed arrow by the four-way valve 30, radiates heat to the atmosphere in the air side heat exchanger 32, condenses, is depressurized by the expansion mechanism 31, and is transferred to the water side. It is sent to the heat exchanger 25, where it exchanges heat with the air conditioning cold and hot water sent from the air conditioning circulation pump 34, is cooled, and collects heat by itself.
It evaporates and returns to the air conditioning compressor 29 through the four-way valve 30 to form a refrigeration cycle. The air conditioning cold and hot water sent from the air conditioning circulation pump 34 is sent to the water side heat exchanger 2.
5 and sent to the three-way valve 36, and when there is an air conditioning load by the three-way valve 36, sent to the radiator 35,
When there is no air conditioning load, the radiator 35 is bypassed,
Return to the air conditioning circulation pump 34. When the cold/hot water in the air conditioning water circuit becomes lower than a predetermined water temperature, the thermostat 68 is opened, the air conditioning compressor motor circuit 70 and the blower motor circuit 71 are stopped, and the cooling operation is stopped. In this way, the cooling operation is controlled by the thermostat 68. If you are performing hot water storage heating operation at the same time as this cooling operation,
When the hot water supply operation switch 18 is closed and the hot water storage heating operation period begins, the contact 38 is closed by the operation of the timer 37.
is closed and the temperature of the hot water stored in the hot water storage tank 6 is below a predetermined temperature, the thermostat 19 is closed and the auxiliary relay 39 is energized. This causes contact 4
_0a1 is closed and the pump motor circuit 24 is operated. When contact 49b ₁ is closed, contact 63c ₁
is connected to the b-side contact, and the hot water supply compressor motor circuit 22 operates to perform hot water heating operation. During hot water storage heating operation, the auxiliary relay 42 is energized, the contact 43 is opened, and the crankcase heater 27 and crankcase heater 28 are de-energized. When the air conditioning load is small and the cooling operation is stopped by opening the thermostat 68, and the temperature of cold and hot water in the air conditioning water circuit continues to drop due to heat collection from the refrigeration cycle on the hot water supply side, the thermostat 44 that senses the outside temperature switches to the b side. When connected to the contact point, when the temperature of cold and hot water in the air conditioning water circuit falls below a predetermined temperature, the thermostat 45 closes, and the auxiliary relay 47 and delay timer 50 close.
is excited. As a result, the contact _49b1 is opened, the hot water supply compressor motor circuit 22 is stopped, and the hot water storage heating operation is immediately stopped. At the same time, the auxiliary relay 42 is de-energized, the contact 43 is closed, and the crankcase heater 27 and the crankcase heater 28 are energized. On the other hand, when the contact _48a1 is closed, the air conditioning compressor motor circuit 70 and the blower motor circuit 71 operate. Further, the contact 48a ₂ is closed, the contact 49b ₂ is opened, and the coil 72 of the four-way valve 30 is de-energized. After a certain period of time, the contact 51 of the delay timer 50 is closed, and the four-way valve 30 is closed. Coil 72 is energized. As a result, the air conditioning refrigeration cycle performs cooling operation for a certain period of time and then enters heating operation, that is, back-up heating operation of the heat source water of the hot water supply side refrigeration cycle. As a result of this back-up heating operation, the temperature of cold and hot water in the air conditioning water circuit rises to a temperature at which the thermostat 45 opens, the auxiliary relay 47 and the delay timer 50 are de-energized, the contact _48a2 is opened, and the four-way valve 30 is opened. The coil 72 is de-energized, the backup heating operation is completed, the contact _48a1 is opened, and the cooling operation is performed in which the operation of the air conditioning compressor motor circuit 70 and the blower motor circuit 71 is controlled by the thermostat 68. . In addition, the contact 49b ₁ is closed, and the hot water supply compressor motor circuit 22 is operated.
The hot water storage heating operation is started again, the auxiliary relay 42 is energized and the contact 43 is opened, the auxiliary relay 42 is energized and the contact 43 is opened, and the crankcase heater 27 and the crankcase heater 28 are de-energized.

〔Effect of the invention〕

As explained above, the present invention causes the air conditioning refrigeration cycle to perform backup heating operation when the temperature of cold/hot water for air conditioning falls below a predetermined temperature due to heat collection of the refrigeration cycle for hot water supply during operation of the refrigeration cycle for hot water supply. By raising the temperature of hot water for air conditioning, it is possible to stably supply the heat source for the refrigeration cycle for hot water supply at a certain temperature level.

[Brief explanation of drawings]

Figure 1 is a system diagram of an air source heat pump type water heater showing a conventional example, Figure 2 is an electric circuit diagram of a conventional example, Figure 3 is a diagram showing the relationship between compression ratio and volumetric efficiency of a reciprocating compressor, and Figure 4 is a diagram showing the relationship between compression ratio and volumetric efficiency of a reciprocating compressor. The figure shows a system diagram showing one embodiment of the heat pump type air-conditioning/heating water heater of the present invention, and FIG. 5 shows an electric circuit diagram of one embodiment of the present invention. In the figure, 1 is a compressor for hot water supply, 2 is a condenser for hot water supply, 3 is an expansion mechanism, 6 is a hot water storage tank, 15 is a circulation pump, 25 is a water side heat exchanger, 26 is an accumulator, 27 is a crankcase heater, 28 is a crankcase heater, 29 is an air conditioning compressor, 30
is a four-way valve, 31 is an expansion mechanism, 32 is an air side heat exchanger, 34 is an air conditioning circulation pump, 35 is a radiator, 3
6 is a three-way valve, 41 is a thermostat, 44 is a thermostat, 45 is a thermostat, 46 is a thermostat, 50 is a delay timer, 68 is a thermostat, 69 is a thermostat, and 72 is a coil. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A refrigeration cycle for hot water supply consisting of a compressor, a condenser for hot water supply, an expansion mechanism, and a water side heat exchanger that acts as an evaporator connected to refrigerant piping in sequence, and a circulation pump for hot water supply to the condenser for hot water supply. It consists of a hot water supply circuit that has a heat exchange relationship with the hot water in the distributed hot water storage tank, a compressor, a four-way valve, an air side heat exchanger, an expansion mechanism, and a water side heat exchanger, which are sequentially connected through refrigerant piping. It is equipped with an air conditioning refrigeration cycle and an air conditioning cold/hot water circuit that is distributed to the load side through the water side heat exchanger by an air conditioning circulation pump, and the water supply refrigeration cycle and cold/hot water are distributed through the water side heat exchanger. An air conditioning refrigeration cycle is disposed in a heat exchange relationship through the air conditioner, and a temperature sensing means for sensing the water temperature of the air conditioning cold/hot water circuit is provided. 1. A heat pump type air-conditioning/heating water heater characterized by having a control means for always heating an air-conditioning refrigeration cycle to raise the temperature of air-conditioning cold/hot water when it senses that the temperature has dropped below the temperature.