JP5703849B2 - Heat pump type water heater - Google Patents

Description

  The present invention relates to a heat pump type hot water supply apparatus.

  Conventionally, for example, Patent Document 1 proposes a heat pump device that can reduce the noise of an outdoor unit fan regardless of the outside air temperature. In this heat pump device, when the outside air temperature is below a predetermined outside air temperature setting value, the rotational speed of the outdoor unit fan is controlled so that the temperature difference between the outside air temperature and the outdoor heat exchange temperature is constant, and When the air temperature is higher than a predetermined outside air temperature setting value, the rotational speed of the outdoor unit fan is controlled so as to keep the low-pressure side pressure of the refrigerant system constant.

JP 2007-187345 A JP 2008-202826 A JP 2010-181052 A

  By the way, in the conventional heat pump hot water supply apparatus, when the performance of the evaporator is sufficiently used, the rotation speed of the blower fan becomes excessive in some cases, and there is a problem that power is consumed excessively. There was a problem of generating extra sound. In addition to the blowing noise, there is a problem that refrigerant noise is likely to be generated from the vicinity of the pressure reducing valve as the pressure of the low-pressure side refrigerant circuit increases.

  The present invention has been made in order to solve the above-described problems, and provides a heat pump hot water supply apparatus that can reduce operation noise and power consumption by suppressing excessive rotation of the blower fan. The purpose is to provide.

A heat pump hot water supply apparatus according to the present invention includes a compressor for compressing a refrigerant, a heat exchanger for heating water to be heated by the refrigerant compressed by the compressor, a decompression device, and an evaporator in order. A heat pump circuit connected to the evaporator, a blower fan for blowing air to the evaporator, an outside air temperature detecting means for detecting the outside air temperature sent to the evaporator by the blower fan, and a refrigerant outlet for detecting the outlet temperature of the refrigerant flowing out of the evaporator A temperature detection means, a heating control means for controlling the heat pump circuit to heat the water to be heated, and a blower fan control means for controlling the rotation speed of the blower fan when the heating control means is executed. control means, based on the outside air temperature, and setting means for the rotational speed of the blower fan is variably set, when the difference value between the outlet temperature of the outside air temperature and the refrigerant is below a predetermined reference value, setting And correcting means for correcting the rotational speed set by the unit to the low rotation side, it is intended to include.
The heat pump hot water supply apparatus according to the present invention includes a compressor that compresses a refrigerant, a heat exchanger that heats water to be heated by the refrigerant compressed by the compressor, a decompressor, and an evaporator. A heat pump circuit that is sequentially connected in an annular manner, a blower fan that blows air to the evaporator, an outside air temperature detection means that detects the outside air temperature sent to the evaporator by the blower fan, and a blower that has passed through the evaporator by the blower of the blower fan Blower outlet temperature detecting means for detecting the outlet temperature, refrigerant outlet temperature detecting means for detecting the outlet temperature of the refrigerant flowing out of the evaporator, heating control means for heating the water to be heated by controlling the heat pump circuit, and heating control And a blower fan control means for controlling the rotation speed of the blower fan when the means is executed, the blower fan control means based on the outside air temperature. A setting means that variably sets, and a correction means that corrects the rotation speed set by the setting means to the low rotation side when the difference value between the outlet temperature of the blast and the outlet temperature of the refrigerant is equal to or less than a predetermined reference value; Is included.
Furthermore, a heat pump hot water supply apparatus according to the present invention includes a compressor that compresses a refrigerant, a heat exchanger that heats water to be heated by the refrigerant compressed by the compressor, a decompression device, and an evaporator. A heat pump circuit that is sequentially connected in an annular manner, a blower fan that blows air to the evaporator, an outside air temperature detection means that detects the outside air temperature sent to the evaporator by the blower fan, and a blower that has passed through the evaporator by the blower of the blower fan A blower outlet temperature detecting means for detecting the outlet temperature, a heating control means for controlling the heat pump circuit to heat the water to be heated, and a blower fan control means for controlling the rotation speed of the blower fan when the heating control means is executed. And the fan fan control means has a setting means for variably setting the number of rotations of the fan according to the outside air temperature, and a difference value between the outside air temperature and the outlet temperature of the fan is If: the constant reference value, is intended to include a correction means for correcting the rotational speed set by the setting means to the low rotation side.

  According to the heat pump type hot water supply apparatus of the present invention, since excessive rotation of the blower fan can be suppressed, it is possible to reduce operation noise and power consumption.

It is a figure which shows the structure of the heat pump type hot-water supply apparatus in Embodiment 1 of this invention. It is a map which shows the correspondence between the outside temperature Tan acquired by the outside temperature thermistor and the set value of the rotational speed FANn of the blower fan. It is a flowchart of the routine performed in Embodiment 1 of the present invention. It is a figure for demonstrating correction | amendment operation | movement of the rotation speed FANn of a ventilation fan. It is a flowchart of the routine performed in Embodiment 2 of this invention. It is a flowchart of the routine performed in Embodiment 3 of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment.

Embodiment 1 FIG.
[Configuration of Embodiment 1]
FIG. 1 is a diagram showing a configuration of a heat pump hot water supply apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the heat pump hot water supply apparatus of this embodiment includes a heat pump unit 100 and a tank unit 200. In the heat pump unit 100, there are a heat pump circuit in which the compressor 1, the heat exchanger 2, the pressure reducing valve 3 and the evaporator 4 are connected in a ring shape by the refrigerant pipe 12, and a blower fan 5 for blowing outside air to the evaporator 4. , Is installed.

  In the tank unit 200, a water supply pump 11 that sends water (hot water) that is a load-side medium to the heat exchanger 2, and a hot water storage tank 10 that stores high-temperature water generated by being heated by the heat exchanger 2, , Is installed. The water pump 11 is configured to be able to switch between operation and stop and to adjust the flow rate by controlling the number of revolutions of the pump by a control device 6 described later. The lower part of the hot water storage tank 10 and the suction port of the water supply pump 11, the discharge port of the water supply pump 11 and the water inlet of the heat exchanger 2, and the water outlet of the heat exchanger 2 and the upper part of the hot water storage tank 10, Connected with. In the present embodiment, the hot water supply circuit is configured by the above-described elements.

  The heat pump unit 100 is provided with a plurality of sensors for detecting various temperatures. Specifically, an outside air temperature thermistor 7 (outside air temperature detecting means) that detects the outside air temperature is disposed in a portion of the heat pump unit 100 that is exposed to the outside. Further, a defrosting determination thermistor 8 for determining whether to perform a defrosting operation for removing frost attached to the evaporator 4 is disposed at the refrigerant outlet of the evaporator 4. According to the defrost determination thermistor 8, the temperature of the refrigerant flowing out of the evaporator 4 (refrigerant outlet temperature) can be detected (refrigerant outlet temperature detecting means). Further, a blower temperature thermistor 9 (blower outlet temperature detecting means) for detecting the blower outlet temperature of the outside air that has passed through the evaporator 4 is disposed on the blower outlet side of the evaporator 4.

  The heat pump hot water supply apparatus according to the present embodiment includes a control device 6. The control device 6 receives signals from the various thermistors 7, 8, and 9 described above, and based on these signals, controls the number of revolutions of the water pump 11, controls the number of revolutions of the compressor 1, and opens the pressure reducing valve 3. Control and rotational speed control of the blower fan 5 are performed.

[Operation of Embodiment 1]
Next, the operation | movement operation | movement with the heat pump type hot-water supply apparatus of this Embodiment 1 is demonstrated.

  First, the heating operation of the heat pump type hot water supply apparatus according to the first embodiment will be described. In the boiling operation, the heat pump circuit and the hot water supply circuit are operated, low temperature water is discharged from the lower part of the hot water storage tank 10 by the water supply pump 11 and supplied to the hot water storage tank 10, and heat exchange with the refrigerant is performed by the heat exchanger 2. This is an operation (heating control means) that boiles the water into hot water and returns the hot water to the upper part of the hot water storage tank 10.

  In response to a boiling operation instruction from the tank unit 200, the heat pump unit 100 performs a boiling operation. Specifically, in the heat pump circuit of the heat pump unit 100, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 decreases in temperature while releasing heat (heating water) to the hot water supply circuit side by the heat exchanger 2. At this time, if the high-pressure side refrigerant pressure is equal to or higher than the critical pressure, the refrigerant radiates heat by lowering the temperature without undergoing a gas-liquid phase transition in a supercritical state. If the high-pressure side refrigerant pressure is equal to or lower than the critical pressure, the refrigerant radiates heat while liquefying. That is, hot water supply heating (boiling) is performed by giving heat radiated from the refrigerant to the load-side medium (here, water flowing through the hot water supply water circuit). The high-pressure and low-temperature refrigerant that has flowed out of the heat exchanger 2 through hot water heating passes through the pressure reducing valve 3.

  The refrigerant that has passed through the pressure reducing valve 3 is reduced in pressure to a low-pressure gas-liquid two-phase state. The refrigerant that has passed through the pressure reducing valve 3 flows into the evaporator 4 where it absorbs heat from the outside air and is evaporated into gas. The low-pressure refrigerant exiting the evaporator 4 is sucked into the compressor 1 and circulated to form a refrigeration cycle.

  On the hot water supply circuit side, the water in the hot water storage tank 10 is guided from the lower part of the hot water storage tank 10 by the water supply pump 11, passes through the water pipe 13, and is conveyed into the heat exchanger 2. Then, it is heated (boiling) by exchanging heat with the refrigerant, passes through the water pipe 13 and flows into the hot water storage tank 10 from the upper part of the hot water storage tank 10. By performing such boiling operation, hot water is stored in the hot water storage tank 10 sequentially from the upper part to the lower part of the hot water storage tank 10.

  Next, operation | movement of the ventilation fan 5 at the time of the boiling operation which is characteristic operation | movement of the heat pump type hot water supply apparatus of this Embodiment is demonstrated. The rotation speed FANn of the blower fan 5 during the heating operation is set by, for example, the outside air temperature Tan acquired by the outside air temperature thermistor 7 at the start of the heating operation. FIG. 2 is a map showing a correspondence relationship between the outside air temperature Tan acquired by the outside air temperature thermistor 7 and the set value of the rotational speed FANn of the blower fan 5. As shown in this figure, the set value of the rotational speed FANn of the blower fan 5 is set so as to gradually decrease as the outside air temperature Tan increases. When the outside air temperature Tan is high, the temperature difference between the refrigerant in the evaporator 4 and the outside air becomes large, so that the endothermic reaction in the evaporator 4 is further activated. In the map shown in FIG. 2, by reducing the rotational speed FANn of the blower fan 5 according to the increase in the outside air temperature Tan, the excessive endothermic reaction in the evaporator 4 is suppressed, and the power consumption and noise are reduced. I am trying to plan.

  Here, assuming that the rotational speed FANn of the blower fan 5 during the heating operation is set based on the map shown in FIG. 2, the outside air temperature Tan does not vary in the rotational speed FANn of the blower fan 5 during the boiling operation. As long as it is controlled to a constant value. However, when the boiling operation proceeds and the temperature of the water fed to the heat exchanger 2 by the water pump 11 gradually increases, the pressure on the low pressure side of the heat pump circuit rises, particularly in a situation where the outside air temperature Tan is high. The temperature of the evaporator 4 rises. In this case, the degree of heating at the outlet of the evaporator 4 is increased, the refrigerant is completely evaporated, and the air blowing at the rotational speed FANn of the blower fan 5 set based on the outside air temperature Tan is excessive.

  Therefore, in the heat pump hot water supply apparatus according to Embodiment 1 of the present invention, the outside temperature thermistor 7 and the defrosting determination thermistor attached to the refrigerant outlet of the evaporator 4 in order to suppress the excessive rotation speed of the blower fan 5 described above. 8 is used to control the rotational speed of the blower fan 5. Hereinafter, specific processing for controlling the rotational speed of the blower fan 5 will be described in detail with reference to a flowchart.

  FIG. 3 is a flowchart of a routine in which the control device 6 executes the rotational speed control of the blower fan 5 during the boiling operation. Note that the routine shown in FIG. 3 is executed when the boiling operation of the heat pump hot water supply apparatus is started. In the routine shown in FIG. 3, first, the rotational speed FANn of the blower fan 5 is set (step 100). Here, specifically, the outside air temperature Tan is acquired by the outside air temperature thermistor 7. Next, the rotational speed FANn corresponding to the outside air temperature Tan is set according to the map shown in FIG.

  Next, it is determined whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive (step 102). As described above, when the boiling operation proceeds and the temperature of the water supplied to the heat exchanger 2 by the water pump 11 rises, the temperature of the evaporator 4 rises, so that the air is blown at the rotational speed FANn of the blower fan 5. It becomes excessive. In such a state, the outlet temperature of the evaporator 4 rises and approaches the outside air temperature, so the difference between the outside air temperature Tan and the defrosting determination temperature (refrigerant outlet temperature) Tdef becomes a small value. Therefore, it is possible to accurately determine whether or not the rotational speed FANn of the blower fan 5 is in an excessive state by calculating a difference value between the outside air temperature Tan and the defrosting determination temperature Tdef. In this step 102, specifically, the outside air temperature Tan and the defrost determination temperature Tdef are first acquired by the outside temperature thermistor 7 and the defrost determination thermistor 8. Next, it is determined whether or not the difference value (Tan−Tdef) between the outside air temperature Tan and the defrost determination temperature Tdef is equal to or lower than a predetermined reference temperature Te1. The predetermined reference temperature Te1 is read with a preset value as a reference value for determining whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive. As a result, when the establishment of (Tan−Tdef) ≦ Te1 is not recognized, it is determined that the current rotational speed FANn of the blower fan 5 is appropriate, and the process of step 102 is repeatedly executed.

  On the other hand, in the above step 102, when it is recognized that (Tan−Tdef) ≦ Te1 is established, it is determined that the current rotational speed FANn of the blower fan 5 is excessive, and the process proceeds to the next step. The rotation speed FANn of the fan 5 is corrected to the low rotation side (step 104). FIG. 4 is a diagram for explaining the operation of correcting the rotational speed of the blower fan 5. As shown in this figure, the rotational speed of the blower fan 5 is corrected by reducing the rotational speed FANn by ΔFANn. In addition, it is preferable to set a minimum value for the rotational speed FANn of the blower fan, and to set ΔFANn within a range not lower than the minimum value.

  In the routine shown in FIG. 3, it is next determined whether or not a boiling end instruction has been issued (step 106). As a result, when the boiling end instruction has not been issued, the process of step 102 is repeatedly executed. On the other hand, when the boiling end instruction is issued, the blower fan 5 is stopped and the boiling operation is ended.

  As described above, according to the heat pump hot water supply apparatus of the first embodiment, it is accurately determined from the outside air temperature Tan and the defrosting determination temperature Tdef that the rotational speed of the blower fan 5 has become excessive, and the blower fan 5 Control is performed to correct the rotational speed of the motor to the low speed side. Thereby, excessive power consumption can be reduced and blowing noise can also be suppressed. Moreover, according to the heat pump type hot water supply apparatus of the first embodiment, since the pressure increase of the low-pressure side refrigerant is suppressed, the refrigerant sound generated from the vicinity of the pressure reducing valve 3 can be effectively suppressed.

  By the way, in the heat pump type hot water supply apparatus of the first embodiment described above, as a correction when the rotational speed FANn of the blower fan 5 is excessive, ΔFANn is decreased from the rotational speed FANn. It is also possible to perform correction to shift to ().

  Further, in the heat pump type hot water supply apparatus of the first embodiment described above, the map shown in FIG. 2 in which the rotational speed FANn of the blower fan 5 corresponding to the outside air temperature Tan is set stepwise is used. The map that can be used for setting FANn is not limited to this. For example, a map in which the rotation speed FANn of the blower fan 5 according to the outside air temperature Tan is set linearly may be used.

Embodiment 2. FIG.
[Features of Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG. The apparatus according to the second embodiment can be realized by causing the control apparatus 6 to execute the process shown in FIG. 5 to be described later using the hardware configuration shown in FIG.

  In the heat pump hot water supply apparatus of the first embodiment described above, the outside temperature thermistor 7 and the defrosting determination thermistor 8 attached to the refrigerant outlet of the evaporator 4 in order to suppress the excessive rotation speed of the blower fan 5 described above, Is used to control the rotational speed of the blower fan 5. On the other hand, in the heat pump type hot water supply apparatus according to the second embodiment of the present invention, the defrost determination thermistor 8 and the blower outlet side of the evaporator 4 are attached to suppress the excessive rotation speed of the blower fan 5 described above. Further, the rotational speed control of the blower fan 5 is performed using the blower temperature thermistor 9. Hereinafter, specific processing for controlling the rotational speed of the blower fan 5 will be described in detail with reference to a flowchart.

  FIG. 5 is a flowchart of a routine in which the control device 6 executes the rotational speed control of the blower fan 5 during the boiling operation. The routine shown in FIG. 5 is executed when the heating operation of the heat pump type hot water supply apparatus is started. In the routine shown in FIG. 5, first, the rotational speed FANn of the blower fan 5 is set (step 200). Here, specifically, the same processing as in step 100 is executed.

  Next, it is determined whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive (step 202). As described above, when the boiling operation proceeds and the temperature of the water supplied to the heat exchanger 2 by the water pump 11 rises, the temperature of the evaporator 4 rises, so that the air is blown at the rotational speed FANn of the blower fan 5. It becomes excessive. In this case, since the pressure of the low-pressure side refrigerant circuit increases and the temperature of the evaporator 4 increases, the degree of heating at the outlet of the evaporator 4 increases. When the refrigerant in the evaporator 4 is completely evaporated, the temperature difference between the refrigerant outlet temperature at the outlet of the evaporator 4 and the temperature of the blower outlet passing through the blower fan 5 becomes a small value. For this reason, it is possible to accurately determine whether or not the rotational speed FANn of the blower fan 5 is in an excessive state by calculating the difference value between the blower outlet temperature Tao and the defrosting determination temperature Tdef. Specifically, in this step 202, first, the blower outlet temperature Tao and the defrost determination temperature Tdef are acquired by the blower temperature thermistor 9 and the defrost determination thermistor 8. Next, it is determined whether or not a difference value (Tao−Tdef) between the air outlet temperature Tao and the defrost determination temperature Tdef is equal to or lower than a predetermined reference temperature Te2. As the predetermined reference temperature Te2, a preset value is read as a reference value for determining whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive. As a result, when the establishment of (Tan−Tdef) ≦ Te2 is not recognized, it is determined that the current rotational speed FANn of the blower fan 5 is appropriate, and the process of step 202 is repeatedly executed.

  On the other hand, when the establishment of (Tao−Tdef) ≦ Te is confirmed in the above step 202, it is determined that the current rotational speed FANn of the blower fan 5 is excessive, and the process proceeds to the next step. The rotation speed FANn of the fan 5 is corrected to the low rotation side (step 204). Here, the same processing as in step 104 is executed.

  In the routine shown in FIG. 5, it is next determined whether or not a boiling end instruction has been issued (step 206). As a result, when the boiling end instruction has not been issued, the process of step 202 is repeatedly executed. On the other hand, when the process is shifted to again and a boiling end instruction is issued, the blower fan 5 is stopped and the boiling operation is ended.

  As described above, according to the heat pump type hot water supply apparatus of the second embodiment, it is accurately determined from the blower outlet temperature Tao and the defrosting determination temperature Tdef that the rotational speed of the blower fan 5 has become excessive. Control for correcting the rotational speed of 5 to the low rotational side is performed. Thereby, excessive power consumption can be reduced and blowing noise can also be suppressed. Moreover, according to the heat pump type hot water supply apparatus of the first embodiment, since the pressure increase of the low-pressure side refrigerant is suppressed, the refrigerant sound generated from the vicinity of the pressure reducing valve 3 can be effectively suppressed.

Embodiment 3 FIG.
[Features of Embodiment 3]
Next, a third embodiment of the present invention will be described with reference to FIG. The apparatus according to the third embodiment can be realized by causing the control apparatus 6 to execute processing shown in FIG. 6 to be described later using the hardware configuration shown in FIG.

  In the heat pump hot water supply apparatus of the first embodiment described above, the outside temperature thermistor 7 and the defrosting determination thermistor 8 attached to the refrigerant outlet of the evaporator 4 in order to suppress the excessive rotation speed of the blower fan 5 described above, Is used to control the rotational speed of the blower fan 5. On the other hand, in the heat pump type hot water supply apparatus according to Embodiment 3 of the present invention, it is attached to the outside temperature thermistor 7 and the blower outlet side of the evaporator 4 in order to suppress the excessive rotational speed of the blower fan 5 described above. Further, the rotational speed control of the blower fan 5 is performed using the blower temperature thermistor 9. Hereinafter, specific processing for controlling the rotational speed of the blower fan 5 will be described in detail with reference to a flowchart.

  FIG. 6 is a flowchart of a routine in which the control device 6 executes the rotational speed control of the blower fan 5 during the boiling operation. The routine shown in FIG. 6 is executed when the heating operation of the heat pump type hot water supply apparatus is started. In the routine shown in FIG. 6, first, the rotational speed FANn of the blower fan 5 is set (step 300). Here, specifically, the same processing as in step 100 is executed.

  Next, it is determined whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive (step 302). As described above, when the boiling operation proceeds and the temperature of the water supplied to the heat exchanger 2 by the water pump 11 rises, the temperature of the evaporator 4 rises, so that the air is blown at the rotational speed FANn of the blower fan 5. It becomes excessive. In this case, since the pressure of the low-pressure side refrigerant circuit increases and the temperature of the evaporator 4 increases, the degree of heating at the outlet of the evaporator 4 increases. When the refrigerant in the evaporator 4 is completely evaporated, the endothermic reaction in the evaporator 4 is not actively performed, and the temperature difference between the outside air temperature and the blower outlet temperature becomes a small value. For this reason, it is possible to accurately determine whether or not the rotational speed FANn of the blower fan 5 is in an excessive state by calculating the difference value between the outside air temperature Tan and the blower outlet temperature Tao. In step 302, specifically, the blower outlet temperature Tao and the outdoor air temperature Tan are first acquired by the blower temperature thermistor 9 and the outside air temperature thermistor 7. Next, it is determined whether or not a difference value (Tan-Tao) between the outside air temperature Tan and the blower outlet temperature Tao is equal to or lower than a predetermined reference temperature Te3. The predetermined reference temperature Te3 is read with a preset value as a reference value for determining whether or not the air blowing at the rotational speed FANn of the blower fan 5 is excessive. As a result, when the establishment of (Tan−Tao) ≦ Te3 is not recognized, it is determined that the current rotational speed FANn of the blower fan 5 is appropriate, and the process of step 302 is repeatedly executed.

  On the other hand, in the above-described step 302, when it is recognized that (Tan−Tao) ≦ Te3, it is determined that the current rotational speed FANn of the blower fan 5 is excessive, and the process proceeds to the next step. The rotation speed FANn of the fan 5 is corrected to the low rotation side (step 304). Here, the same processing as in step 104 is executed.

  In the routine shown in FIG. 6, it is next determined whether or not a boiling end instruction has been issued (step 306). As a result, when the boiling end instruction has not been issued, the process of step 302 is repeatedly executed. On the other hand, when the boiling end instruction is issued, the blower fan 5 is stopped and the boiling operation is ended.

  As described above, according to the heat pump hot water supply apparatus of the third embodiment, it is accurately determined from the outside air temperature Tan and the air outlet temperature Tao that the rotational speed of the air fan 5 has become excessive, and the air fan 5 Control is performed to correct the rotational speed of the motor to the low speed side. Thereby, excessive power consumption can be reduced and blowing noise can also be suppressed. Moreover, according to the heat pump type hot water supply apparatus of the first embodiment, since the pressure increase of the low-pressure side refrigerant is suppressed, the refrigerant sound generated from the vicinity of the pressure reducing valve 3 can be effectively suppressed.

1 Compressor 2 Heat exchanger 3 Pressure reducing valve (pressure reducing device)
4 Evaporator 5 Blower Fan 6 Control Device 7 Outside Air Temperature Thermistor (Outside Air Temperature Detection Means)
8 Defrosting determination thermistor (refrigerant outlet temperature detection means)
9 Blower temperature thermistor (Blower outlet temperature detection means)
DESCRIPTION OF SYMBOLS 10 Hot water storage tank 11 Water supply pump 12 Refrigerant piping 13 Water piping 100 Heat pump unit 200 Tank unit

Claims (4)

A heat pump circuit in which a compressor for compressing a refrigerant, a heat exchanger for heating water to be heated by the refrigerant compressed by the compressor, a decompression device, and an evaporator are sequentially connected in an annular shape;
A blower fan for blowing air to the evaporator;
An outside air temperature detecting means for detecting an outside air temperature sent to the evaporator by the blower fan;
Refrigerant outlet temperature detecting means for detecting the outlet temperature of the refrigerant flowing out of the evaporator;
Heating control means for controlling the heat pump circuit to heat the water to be heated;
A blower fan control means for controlling the rotational speed of the blower fan when executing the heating control means;
The blower fan control means includes:
Setting means for variably setting the rotational speed of the blower fan based on the outside air temperature;
Correction means for correcting the rotation speed set by the setting means to a low rotation side when a difference value between the outside air temperature and the outlet temperature of the refrigerant is a predetermined reference value or less ;
A heat pump type hot water supply apparatus characterized by including. A heat pump circuit in which a compressor for compressing a refrigerant, a heat exchanger for heating water to be heated by the refrigerant compressed by the compressor, a decompression device, and an evaporator are sequentially connected in an annular shape;
A blower fan for blowing air to the evaporator;
An outside air temperature detecting means for detecting an outside air temperature sent to the evaporator by the blower fan;
Blower outlet temperature detection means for detecting the outlet temperature of the blown air that has passed through the evaporator by blowing of the blower fan,
Refrigerant outlet temperature detecting means for detecting the outlet temperature of the refrigerant flowing out of the evaporator;
Heating control means for controlling the heat pump circuit to heat the water to be heated;
A blower fan control means for controlling the rotational speed of the blower fan when executing the heating control means;
The blower fan control means includes:
Setting means for variably setting the rotational speed of the blower fan based on the outside air temperature;
A correction means for correcting the rotational speed set by the setting means to a low rotation side when a difference value between the outlet temperature of the blast and the outlet temperature of the refrigerant is a predetermined reference value or less ;
A heat pump type hot water supply apparatus characterized by including. A heat pump circuit in which a compressor for compressing a refrigerant, a heat exchanger for heating water to be heated by the refrigerant compressed by the compressor, a decompression device, and an evaporator are sequentially connected in an annular shape;
A blower fan for blowing air to the evaporator;
An outside air temperature detecting means for detecting an outside air temperature sent to the evaporator by the blower fan;
Blower outlet temperature detection means for detecting the outlet temperature of the blown air that has passed through the evaporator by blowing of the blower fan,
Heating control means for controlling the heat pump circuit to heat the water to be heated;
A blower fan control means for controlling the rotational speed of the blower fan when executing the heating control means;
The blower fan control means includes:
Setting means for variably setting the rotational speed of the blower fan based on the outside air temperature;
Correction means for correcting the rotational speed set by the setting means to a low rotation side when the difference value between the outside air temperature and the outlet temperature of the air blow is equal to or less than a predetermined reference value ;
A heat pump type hot water supply apparatus characterized by including. The said setting means sets so that the rotation speed of the said ventilation fan may fall in steps as the said external temperature becomes high , The any one of Claims 1-3 characterized by the above-mentioned. Heat pump water heater.

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