Heat pump unit, abnormal time heating method and abnormal time heating program

Abstract

To maintain an operation even when a hot water storage temperature is not normal.SOLUTION: A heat pump unit 100 for heating water includes: heating means 110 for heating water flowing in from a hot water storage tank 310; and a control device 120 that controls a heating operation by the heating means 110. The control device 120 includes: an information acquisition section 121 that acquires an inflow water temperature indicating a temperature of water flowing from the hot water storage tank 310 into the heating means 110 and a hot water delivery temperature indicating a temperature of water flowing out from the heating means 110 toward the hot water storage tank 310; a normality determination section 122 that determines whether or not a hot water storage temperature indicating a temperature of water in the hot water storage tank 310 is acquired normally; and a set value updating section 124 that when the normality determination section 122 determines that the hot water storage temperature is not acquired normally or might not be acquired normally, if a temperature difference between the hot water delivery temperature and the inflow water temperature is less than a temperature difference threshold value, updates a target hot water storage temperature of the water in the hot water storage tank 310 through the heating operation to a higher target hot water storage temperature.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a heat pump unit that heats water stored in a hot water storage tank, an abnormality heating method, and an abnormality heating program. In this specification, claims, and drawings, "water" is not limited to a specific temperature, but is used to include hot water at a predetermined temperature or higher. In addition, the kanji character "yu" may be used to facilitate understanding, but in this specification, claims, and drawings, "yu" is used as a concept included in "mizu." [Background technology]

[0002] Conventionally, there are heat pump units that heat water. For example, Patent Document 1 describes a heat pump unit that uses a sensor to measure the temperature in a hot water tank that stores heated water and controls operation based on the measurement result. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-170764 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the sensor that measures the temperature of the water in the hot water tank breaks down, the conventional heat pump unit stops operating to avoid abnormal operation of the compressor and reduced reliability of the compressor. In this case, there is a problem that the required temperature and amount of water cannot be secured.

[0005] The present disclosure provides a heat pump unit, an abnormality heating method, and an abnormality heating program that maintain operation for heating water and avoid a decrease in compressor reliability even when the temperature of the water in a hot water storage tank cannot be accurately obtained. [Means for solving the problem]

[0006] A heat pump unit according to the present disclosure is a heat pump unit that heats water stored in a hot water storage tank, and includes a heating means that heats the water flowing in from the hot water storage tank by heat exchange with a heat medium heated based on compression and expansion, and a control device that controls the heating operation by the heating means, and the control device includes an information acquisition unit that acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means and an outlet water temperature indicating the temperature of water flowing out from the heating means to the hot water storage tank, a normality judgment unit that judges whether the hot water storage temperature indicating the temperature of the water in the hot water storage tank has been acquired normally, and a setting value update unit that updates the target hot water storage temperature of the water in the hot water storage tank by the heating operation to a higher target hot water storage temperature when the normality judgment unit determines that the hot water storage temperature has not been acquired normally or there is a possibility that it has not been acquired normally, and if the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold value.

[0007] One aspect of the present disclosure is a heating method in an abnormality, in a heat pump unit including a heating means for heating water flowing in from a hot water storage tank by heat exchange with a heat medium heated based on compression and expansion, and a control device for controlling the heating operation by the heating means, an information acquisition unit acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means, and an outlet water temperature indicating the temperature of water flowing out from the heating means toward the hot water storage tank, a normality judgment unit judges whether the hot water temperature indicating the temperature of the water in the hot water storage tank has been acquired normally, and if the normality judgment unit determines that the hot water temperature has not been acquired normally or there is a possibility that it has not been acquired normally, and if the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold, a set value update unit updates the target hot water temperature of the water in the hot water storage tank by the heating operation to a higher target hot water temperature.

[0008] One aspect of the present disclosure is a heating program for abnormal situations. In a heat pump unit including a heating means for heating water flowing in from a hot water storage tank by heat exchange with a heat medium heated based on compression and expansion, and a control device for controlling the heating operation by the heating means, the program is realized by having the control device execute an information acquisition unit for acquiring an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means, and an outlet water temperature indicating the temperature of water flowing out from the heating means to the hot water storage tank, a normality judgment unit for judging whether the hot water storage temperature indicating the temperature of water in the hot water storage tank has been acquired normally, and a setting value update unit for updating the target hot water storage temperature of the water in the hot water storage tank by the heating operation to a higher target hot water storage temperature if the normality judgment unit judges that the hot water storage temperature has not been acquired normally or may not be acquired normally, and if the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold value. Effect of the Invention

[0009] According to the present disclosure, even if the temperature of the water in the hot water storage tank cannot be accurately obtained, the operation of heating the water can be maintained, and a decrease in the reliability of the compressor provided in the heat pump unit can be avoided. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram showing the configuration of a heat pump unit installed in a hot water supply system. [Diagram 2] 4 is a block diagram showing a functional configuration of a control device provided in the heat pump unit. FIG. [Diagram 3] 4 is a flowchart showing the flow of operation of the heat pump unit. [Figure 4] 10 is a flowchart showing another example 1 of the flow of operation of the heat pump unit. [Diagram 5] 10 is a flowchart showing another example 2 of the operational flow of the heat pump unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the heat pump unit, the abnormality heating method, and the abnormality heating program according to the present disclosure will be described with reference to the drawings. Note that the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, mathematical expressions, the contents of each step in the method, and the order of each step shown in the following embodiments are examples and may include contents not described below. In addition, geometric expressions such as parallel and orthogonal may be used, but these expressions do not indicate mathematical strictness, and include substantially permissible errors, deviations, etc. In addition, expressions such as simultaneous and identical also include substantially permissible ranges.

[0012] In addition, the drawings are schematic diagrams in which emphasis, omission, or ratio adjustment is appropriately performed to explain the present disclosure, and are different from the actual shapes, positional relationships, and ratios. In addition, the X-axis, Y-axis, and Z-axis that may be shown in the drawings indicate orthogonal coordinates that are arbitrarily set for the explanation of the drawings. In other words, the Z-axis is not necessarily an axis along the vertical direction, and the X-axis and Y-axis are not necessarily present in a horizontal plane.

[0013] In addition, in the following, a plurality of disclosures may be collectively described as one embodiment. In addition, some of the contents described below are described as optional components related to the present disclosure.

[0014] Furthermore, the flowcharts are merely examples, and embodiments of the present disclosure may include different process flows, such as a different order of processes, multiple processes being integrated, or one process being separated.

[0015] 1 is a diagram showing the configuration of a heat pump unit 100 attached to a hot water supply system 300. The hot water supply system 300 is a unit that supplies water heated to a predetermined temperature, and includes a hot water storage tank 310, a hot water storage temperature sensor 311, a pressure reducing valve 321, a relief valve 322, an on-off valve 323, heating pipes 324, and a remote controller 325.

[0016] Hot water tank 310 is a tank that stores water heated by heat pump unit 100, and is equipped with a hot water temperature sensor 311 for measuring the temperature of the water in hot water tank 310. In the present embodiment, hot water tank 310 stores water heated by heat pump unit 100, mixes the heated water with water (such as tap water) supplied through pressure reducing valve 321, and stores water at a predetermined temperature.

[0017] The pressure reducing valve 321 is a valve for reducing the pressure of water, such as tap water, that is generally supplied, to a predetermined pressure and injecting the water into the hot water tank 310 .

[0018] The relief valve 322 is a valve for opening the hot water tank 310 to reduce the pressure when the pressure inside the hot water tank 310 reaches a predetermined value.

[0019] The on-off valve 323 is a valve that can select whether or not to allow heated water in the hot water storage tank 310 to flow outside from a faucet, shower, or the like.

[0020] The heating pipe 324 forms a circulation water passage for supplying water in the hot water storage tank 310 to the heat pump unit 100 and returning the water heated by the heat pump unit 100 to the hot water storage tank 310 .

[0021] Remote controller 325 is a device that includes a processor and a communication module, and is capable of acquiring information on the hot water temperature, which indicates the temperature of the water in hot water storage tank 310, from hot water temperature sensor 311, and transmitting the target hot water temperature to control device 120 (described in detail below) included in heat pump unit 100. Remote controller 325 may also be capable of setting the target hot water temperature by a direct operation of the user, or an indirect operation via a mobile terminal owned by the user. Remote controller 325 may also be connected to a cloud server or the like, and be capable of setting the target hot water temperature according to the climate and environment of the place where hot water supply system 300 is installed.

[0022] Heat pump unit 100 is a unit that heats water stored in hot water tank 310, and includes heating means 110 and control device 120. In this embodiment, heat pump unit 100 includes inlet water temperature sensor 151, outlet hot water temperature sensor 152, compressor 153, expansion valve 154, air heat exchanger 155, blower 156, and pump 157. Heating means 110, compressor 153, expansion valve 154, and air heat exchanger 155 configure a heat pump circuit in which a heat medium absorbs heat from the atmosphere and supplies heat to water from hot water tank 310.

[0023] The heating means 110 is a heat exchanger that provides the heat of the heat medium heated by compression in the compressor 153 to the water that has flowed in from the hot water storage tank 310 to heat it.

[0024] Inlet water temperature sensor 151 is a sensor that measures and outputs the temperature of water flowing from hot water tank 310 through heating piping 324 into heating means 110. Outlet water temperature sensor 152 is a sensor that measures and outputs the temperature of water flowing out from heating means 110 toward hot water tank 310 through heating piping 324. There are no limitations on the types of inlet water temperature sensor 151 and outlet hot water temperature sensor 152, and a thermistor can be used, for example.

[0025] The compressor 153 compresses the heat medium heated by the temperature of the atmosphere using an air heat exchanger 155 (described in detail later), and further heats the heat medium.

[0026] The expansion valve 154 is a pressure reducing device for increasing the volume of the heat medium that has been cooled by heat exchange with water in the heating means 110, thereby cooling the heat medium.

[0027] The air heat exchanger 155 is an evaporator that exchanges heat between the heat medium cooled by the expansion valve 154 and the heat in the atmosphere, and heats the cooled heat medium. In the air heat exchanger 155, heat exchange is performed between the air sent by the blower 156 and the heat medium.

[0028] The pump 157 is a pump capable of circulating a predetermined amount of water between the hot water storage tank 310 and the heating means 110 through the heating pipe 324 .

[0029] 2 is a block diagram showing a functional configuration of the control device 120 provided in the heat pump unit 100. The control device 120 is a device that controls the heating operation by the heat pump unit 100 including the heating means 110, and includes a processor. The control device 120 includes an information acquisition unit 121, a normality determination unit 122, and a set value update unit 124 as processing units that are realized by causing the processor to execute an abnormality heating program. In the case of this embodiment, the control device 120 includes an operation stop unit 127.

[0030] Information acquisition unit 121 acquires, as information, an inlet water temperature indicating the temperature of water flowing from hot water storage tank 310 to heating means 110 from inlet water temperature sensor 151. Also, information is acquired, as information, an outlet water temperature indicating the temperature of water flowing out from heating means 110 toward hot water storage tank 310 from outlet water temperature sensor 152. Also, information is acquired, as information, a stored hot water temperature indicating the temperature of water in hot water storage tank 310 from stored hot water temperature sensor 311. Note that information regarding the stored hot water temperature may be acquired directly by information acquisition unit 311 from stored hot water temperature sensor 311 as shown in FIG. 2, or may be acquired via remote controller 325, or may be acquired indirectly as a heating instruction output from remote controller 325 based on the stored hot water temperature.

[0031] The normality determination unit 122 determines whether the hot water temperature indicating the temperature of water in the hot water storage tank 310 has been acquired normally. The state in which the hot water temperature has not been acquired normally includes a state in which there is a discrepancy between the temperature of water stored in the hot water storage tank 310 and the hot water temperature output as information, and includes a state in which no signal is output from the hot water temperature sensor 311, a state in which error information indicating an abnormality in the hot water temperature sensor 311 is output, and the like. The method by which the normality determination unit 122 determines whether the hot water temperature has been acquired normally is not limited. For example, when the normality determination unit 122 acquires error information indicating that the hot water temperature sensor 311 is broken from the remote controller 325, the hot water temperature sensor 311, or the like, the normality determination unit 122 may determine that the hot water temperature has not been acquired normally. In addition, the normality determination unit 122 may determine that the hot water temperature has not been acquired normally when the hot water temperature indicates a substantially constant value even though the heat pump unit 100 is operating, when the hot water temperature indicates an impossible temperature, or the like. Furthermore, the normality determination unit 122 may determine that the acquired hot water temperature is not normal when the temperature difference between the outlet water temperature and the inlet water temperature is less than a predetermined temperature difference threshold. Furthermore, the normality determination unit 122 may determine that the acquired hot water temperature is not normal when the inlet water temperature is equal to or greater than the inlet water temperature threshold and the temperature difference between the outlet water temperature and the inlet water temperature is equal to or less than a predetermined temperature. The normality determination unit 122 may determine whether the hot water temperature is acquired normally by combining a plurality of methods. Furthermore, the normality determination unit 122 may have a step of determining whether or not there is a possibility that the hot water temperature is not acquired normally before determining whether or not the hot water temperature is acquired normally. That is, the normality determination unit 122 may determine whether or not the hot water temperature is acquired normally in two stages.

[0032] When the normality determination unit 122 determines that the hot water temperature is not normally acquired, the set value update unit 124 determines whether the temperature difference between the outlet water temperature and the inlet water temperature is less than the temperature difference threshold, and when the temperature difference is less than the temperature difference threshold, updates the target hot water temperature of the water in the hot water storage tank 310 by the heating operation to a target hot water temperature that is higher than the current temperature. In the present embodiment, the set value update unit 124 determines whether the temperature difference is less than the temperature difference threshold at a predetermined interval, and updates the target hot water temperature to a target hot water temperature higher than the current temperature each time the temperature difference becomes less than the temperature difference threshold. Note that the set value update unit 124 may suspend the update of the target hot water temperature when the target hot water temperature exceeds the high temperature threshold. The value of the temperature difference threshold is not limited, but may be, for example, 5°C or more, and in the present embodiment, a temperature difference threshold of 15°C is adopted. When the temperature difference threshold is less than 5°C, a malfunction such as unstable control occurs. In addition, the value of the high temperature threshold is not limited, but may be, for example, 90°C. In addition, when the normality judgment unit 122 judges that there is a possibility that the hot water temperature has not been acquired normally, the setting value update unit 124 judges whether the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold, and if the temperature difference is less than the temperature difference threshold, the setting value update unit 124 may update the target hot water temperature of the water in the hot water storage tank 310 by the heating operation to a target hot water temperature that is higher than the current temperature.

[0033] In this embodiment, when normality determination unit 122 determines that the stored hot water temperature has not been acquired normally, set value update unit 124 determines whether the temperature difference between the outlet hot water temperature and the inlet water temperature is less than the temperature difference threshold, and if the temperature difference is less than the temperature difference threshold, may update the rotation speed of the motor provided in blower device 156 (the rotation speed of the fan rotated by the motor) to a lower rotation speed than the current rotation speed (details will be described later). Set value update unit 124 may determine at a predetermined interval whether the temperature difference is less than the temperature difference threshold, and may update the rotation speed to a lower rotation speed than the current rotation speed every time the temperature difference becomes less than the temperature difference threshold.

[0034] Furthermore, in this embodiment, if the temperature difference between the outlet hot water temperature and the inlet water temperature is less than the temperature difference threshold, the set value updating unit 124 may update the inlet water temperature threshold to a higher inlet water temperature threshold (details will be described later).

[0035] When the inlet water temperature becomes equal to or higher than the inlet water temperature threshold, operation stopping unit 127 stops the heating operation of heating means 110, that is, stops the operation of heat pump unit 100.

[0036] Next, the operation of the heat pump unit 100 will be described. FIG. 3 is a flow chart showing the flow of the operation of the heat pump unit 100. In a state where the heating means 110 of the heat pump unit 100 is heating the water flowing from the hot water tank 310, the normality determination unit 122 determines whether the hot water temperature sensor 311 is operating normally, that is, whether the hot water temperature obtained from the hot water temperature sensor 311 is normal, at a predetermined time interval (S101). Even if the normality determination unit 122 determines that the hot water temperature is not normally acquired (S101, No), the heating operation of the heat pump unit 100 continues. In addition, after the point in time when it is determined that the hot water temperature is not normally acquired, the control device 120 controls the heat pump unit 100 based on two pieces of information, the inlet water temperature and the outlet hot water temperature, without using the hot water temperature obtained directly or indirectly from the hot water temperature sensor 311.

[0037] Information acquisition unit 121 acquires the inlet water temperature and outlet hot water temperature as information from inlet water temperature sensor 151 attached upstream of heating means 110 in the circulating water flow, and outlet hot water temperature sensor 152 attached downstream in the circulating water flow (S102). Information acquisition unit 121 may acquire a target hot water temperature set by remote controller 325 or the like. Information acquisition unit 121 may also acquire the hot water temperature from hot water temperature sensor 311 attached to hot water storage tank 310, but this hot water temperature is not used for control.

[0038] Next, the set value update unit 124 judges whether the temperature difference between the outlet water temperature (OUTTh) and the inlet water temperature (INTh) is less than the temperature difference threshold (S103). In the present embodiment, the temperature difference threshold is 15°C, but is not limited to this value. If the temperature difference is less than the temperature difference threshold (S103, No), the set value update unit 124 judges whether the target hot water temperature is less than the high temperature threshold (S104), and if the target hot water temperature is less than the high temperature threshold, updates the target hot water temperature of the water in the hot water storage tank 310 by the heating operation to a target hot water temperature that is higher than the current temperature (S105). For example, the set value update unit 124 may update the target hot water temperature using the formula: target hot water temperature = target hot water temperature + rising temperature. The rising temperature is not limited, but can be, for example, 5°C. The high temperature threshold value is not limited, but can be, for example, 90°C. When the target hot water temperature is equal to or higher than the high temperature threshold (S104, No), the target hot water temperature is not updated (S105).

[0039] If the temperature difference between the outlet hot water temperature (OUTTh) and the inlet water temperature (INTh) is equal to or greater than the temperature difference threshold (S103, Yes), the set value update unit 124 determines whether the temperature difference between the outlet hot water temperature (OUTTh) and the inlet water temperature (INTh) is less than the temperature difference threshold (S103) at predetermined intervals until the inlet water temperature (INTh) reaches the inlet water temperature threshold (e.g., 60°C) (S106, No). On the other hand, if the inlet water temperature (INTh) exceeds a predetermined temperature (e.g., 60°C) (S106, Yes), the operation stop unit 127 stops the operation of the heat pump unit 100 (S107).

[0040] According to the above-described operation of the heat pump unit 100, even if the hot water temperature sensor 311 indicates an abnormality, the operation of heating water can be maintained by controlling the inlet water temperature and the outlet hot water temperature, and a decrease in the reliability of the compressor 153 can be avoided.

[0041] Next, another example 1 of the operation of the heat pump unit 100 will be described. The another example 1 of the operation of the heat pump unit 100 may be executed in parallel with the operation of the heat pump unit 100 described above. FIG. 4 is a flowchart showing another example 1 of the flow of the operation of the heat pump unit 100. In a state in which the heating means 110 of the heat pump unit 100 is heating the water flowing from the hot water tank 310, the normality determination unit 122 determines at a predetermined interval whether the hot water temperature sensor 311 is operating normally, that is, whether the hot water temperature obtained from the hot water temperature sensor 311 is normal (S201). Even if the normality determination unit 122 determines that the hot water temperature is not normally obtained (S201, No), the operation of the blower 156 of the heat pump unit 100 is maintained.

[0042] Information acquisition unit 121 acquires the inlet water temperature and the outlet hot water temperature as information from inlet water temperature sensor 151 and outlet hot water temperature sensor 152 (S202). Note that information acquisition unit 121 may also acquire the rotation speed of the motor (the rotation speed of the fan) provided in blower device 156.

[0043] Next, the set value update unit 124 determines whether the temperature difference between the outlet hot water temperature (OUTTh) and the inlet water temperature (INTh) is less than the temperature difference threshold (S203). If the temperature difference is less than the temperature difference threshold (No in S203), the rotation speed of the motor of the blower 156 is updated to a lower rotation speed than the current rotation speed. For example, the set value update unit 124 may update the rotation speed of the motor using the formula: rotation speed = rotation speed - reduction number. The reduction number is not limited, but may be, for example, 50 rpm.

[0044] If the temperature difference between the outlet hot water temperature (OUTTh) and the inlet water temperature (INTh) is equal to or greater than the temperature difference threshold (S203, Yes), the set value update unit 124 determines whether the temperature difference between the outlet hot water temperature (OUTTh) and the inlet water temperature (INTh) is less than the temperature difference threshold at predetermined intervals (S203) until the inlet water temperature (INTh) becomes the inlet water threshold temperature (e.g., 60°C) (S205, No). On the other hand, if the inlet water temperature (INTh) exceeds the inlet water threshold temperature (e.g., 60°C) (S205, Yes), the operation stop unit 127 stops the operation of the heat pump unit 100 (S206).

[0045] According to the operation of the heat pump unit 100 of the first modification, even if the hot water temperature sensor 311 indicates an abnormality, the operation of heating water can be maintained, and the deterioration of the reliability of the compressor 153 can be avoided by lowering the heat exchange efficiency of the air heat exchanger 155. In addition, the amount of energy consumption can be suppressed.

[0046] The present disclosure is not limited to the above-mentioned embodiment. For example, the present disclosure may be realized by combining the components described in this specification in any way, or by excluding some of the components. In addition, the present disclosure also includes modifications obtained by applying various modifications that a person skilled in the art can think of to the above-mentioned embodiment without departing from the gist of the present disclosure, that is, the meaning of the words described in the claims.

[0047] For example, as shown in Fig. 5, when the temperature difference between the outlet water temperature (OUTTh) and the inlet water temperature (INTh) is less than the temperature difference threshold (S103, No), the set value update unit 124 may update the target hot water temperature (S105) and update the inlet water temperature threshold to a higher inlet water temperature threshold (S105a). For example, the set value update unit 124 may update the inlet water temperature threshold using the formula inlet water temperature threshold = inlet water temperature threshold + increment. The increment is not limited, but can be, for example, 5°C. Note that the flows with the same numbers as those in Fig. 3 have the same operations, so their explanations are omitted.

[0048] Further, the case has been described in which information acquisition unit 121 acquires the stored hot water temperature indicating the temperature of water in hot water storage tank 310, but information acquisition unit 121 does not necessarily have to acquire the stored hot water temperature.

[0049] Further, in the embodiment, the case where heat pump unit 100 includes pump 157 has been described, but heat pump unit 100 may not include pump 157 and hot water supply system 300 may include pump 157 instead.

[0050] A first aspect of the embodiment of the heat pump unit 100 is a heat pump unit 100 that heats water stored in a hot water storage tank 310, and includes a heating means 110 that heats the water flowing in from the hot water storage tank 310 by heat exchange with a heat medium heated based on compression and expansion, and a control device 120 that controls the heating operation by the heating means 110. The control device 120 includes an information acquisition unit 121 that acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank 310 to the heating means 110 and an outlet water temperature indicating the temperature of water flowing out from the heating means 110 toward the hot water storage tank 310, a normality judgment unit 122 that judges whether the stored hot water temperature indicating the temperature of the water in the hot water storage tank 310 has been acquired normally, and a setting value update unit 124 that updates the target stored hot water temperature of the water in the hot water storage tank 310 by the heating operation to a higher target stored hot water temperature when the normality judgment unit 122 judges that the temperature has not been acquired normally or there is a possibility that the temperature has not been acquired normally and the temperature difference between the outlet water temperature and the inlet water temperature is less than the temperature difference threshold.

[0051] According to the first aspect, even if the hot water temperature cannot be obtained normally due to an abnormality occurring in the hot water temperature sensor 311, the target hot water temperature can be updated to a higher target hot water temperature to maintain the operation of the heat pump unit 100. This ensures a large difference between the temperature of the heat medium flowing into the compressor 153 and the temperature of the heat medium flowing out of the compressor 153, and prevents the reliability of the compressor 153 from decreasing.

[0052] The second embodiment of the heat pump unit 100 includes the first embodiment, and the set value update unit 124 determines at predetermined intervals whether the temperature difference is less than the temperature difference threshold, and updates the target hot water storage temperature to a higher target hot water storage temperature each time the temperature difference becomes less than the temperature difference threshold.

[0053] According to the second aspect, it is possible to maintain the operation of the heat pump unit 100 while ensuring a large difference between the inlet water temperature and the outlet hot water temperature, and to heat the water from the hot water storage tank 310.

[0054] The heat pump unit 100 of the third aspect includes the first aspect or the second aspect, and the normality determination unit 122 determines that the hot water temperature has not been acquired normally when the temperature difference is less than the temperature difference threshold value.

[0055] According to the third aspect, it is possible to detect that the hot water temperature sensor 311 is not operating normally based on information from the inlet water temperature sensor 151 and the outlet hot water temperature sensor 152, and it is possible to maintain the operation of the heat pump unit 100 while ensuring the reliability of the compressor 153 based on information within the heat pump unit 100.

[0056] The fourth aspect of the heat pump unit 100 includes any of the first to third aspects, and the set value update unit 124 updates the inlet water temperature threshold to a higher inlet water temperature threshold when the temperature difference is less than the temperature difference threshold, and the control device 120 is provided with an operation stop unit 127 that stops the heating operation of the heating means 110 when the inlet water temperature becomes equal to or higher than the inlet water temperature threshold.

[0057] According to the fourth aspect, by updating the inlet water temperature to a higher inlet water temperature based on a predetermined condition, it is possible to ensure the operation of the heat pump unit 100 for a long period of time.

[0058] In a fifth aspect of the heating method in an abnormality, in a heat pump unit 100 including a heating means 110 which heats water flowing in from a hot water storage tank 310 by heat exchange with a heat medium heated based on compression and expansion, and a control device 120 which controls the heating operation by the heating means 110, an information acquisition unit 121 acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank 310 to the heating means 110, and an outlet water temperature indicating the temperature of water flowing out from the heating means 110 toward the hot water storage tank 310, a normality judgment unit 122 judges whether the stored hot water temperature indicating the temperature of the water in the hot water storage tank 310 has been acquired normally, and if the normality judgment unit 122 determines that the stored hot water temperature has not been acquired normally or there is a possibility that it has not been acquired normally, and if the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold, a set value update unit 124 updates the target stored hot water temperature of the water in the hot water storage tank 310 by the heating operation to a higher target stored hot water temperature.

[0059] According to the fifth aspect, even if the hot water temperature cannot be obtained normally due to an abnormality in the hot water temperature sensor 311, the target hot water temperature can be updated to a higher target hot water temperature to maintain the operation of the heat pump unit 100. This ensures a large difference between the temperature of the heat medium flowing into the compressor 153 and the temperature of the heat medium flowing out of the compressor 153, and prevents the reliability of the compressor 153 from decreasing.

[0060] The sixth embodiment of the abnormality heating program is realized in a heat pump unit 100 including a heating means 110 that heats water flowing in from a hot water storage tank 310 by heat exchange with a heat medium heated based on compression and expansion, and a control device 120 that controls the heating operation by the heating means 110, by having the control device 120 execute an information acquisition unit 121 that acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank 310 to the heating means 110 and an outlet water temperature indicating the temperature of water flowing out from the heating means 110 to the hot water storage tank 310, a normality determination unit 122 that determines whether the stored hot water temperature indicating the temperature of water in the hot water storage tank 310 has been acquired normally, and a setting value update unit 124 that updates the target stored hot water temperature of the water in the hot water storage tank 310 by the heating operation to a higher target stored hot water temperature when the normality determination unit 122 determines that the stored hot water temperature has not been acquired normally or may not be acquired normally, and if the temperature difference between the outlet water temperature and the inlet water temperature is less than the temperature difference threshold value.

[0061] According to the sixth aspect, even if the hot water temperature cannot be obtained normally due to an abnormality in the hot water temperature sensor 311, the target hot water temperature can be updated to a higher target hot water temperature to maintain the operation of the heat pump unit 100. This ensures a large difference between the temperature of the heat medium flowing into the compressor 153 and the temperature of the heat medium flowing out of the compressor 153, and prevents the reliability of the compressor 153 from decreasing. [Industrial Applicability]

[0062] The heat pump unit 100 of the present disclosure can be used in a hot water supply system 300 that heats water stored in the hot water supply system 300, an air conditioning unit that heats water for heating, and the like. [Explanation of symbols]

[0063] 100 Heat Pump Unit 110 Heating means 120 Control device 121 Information Acquisition Department 122 Normality Judgment Department 124 Setting value update section 127 Operation stop section 151 Inlet water temperature sensor 152 Outlet water temperature sensor 153 Compressor 154 Expansion valve 155 Air Heat Exchanger 156 Blower 157 Pump 300 Hot Water System 310 Hot Water Tank 311 Hot water temperature sensor 321 Pressure reducing valve 322 Relief valve 323 On-off valve 324 Heating piping 325 Remote Controller

Claims

1. A heat pump unit that heats water stored in a hot water storage tank, a heating means for heating the water flowing from the hot water storage tank by heat exchange with a heat medium heated based on compression and expansion; A control device for controlling a heating operation by the heating means, The control device includes: an information acquisition unit that acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means and an outlet water temperature indicating the temperature of water flowing from the heating means to the hot water storage tank; a normality determination unit that determines whether a hot water temperature indicating a temperature of the water in the hot water tank is normally acquired; and a set value update unit that updates a target hot water temperature of the water in the hot water storage tank by the heating operation to a higher target hot water temperature when the normality determination unit determines that the hot water temperature has not been acquired normally or may not be acquired normally and the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold. Heat pump unit.

2. The setting value update unit determining at predetermined intervals whether the temperature difference is less than a temperature difference threshold; Each time the temperature difference becomes less than the temperature difference threshold, the target hot water temperature is updated to a higher target hot water temperature. The heat pump unit according to claim 1.

3. The normality determination unit is If the temperature difference is less than the temperature difference threshold, it is determined that the stored hot water temperature is not normally acquired. A heat pump unit according to claim 1 or 2.

4. The setting value update unit if the temperature difference is less than the temperature difference threshold, updating the inlet water temperature threshold to a higher inlet water temperature threshold; The control device includes: The heating means is provided with an operation stopping unit that stops the heating operation of the heating means when the inlet water temperature becomes equal to or higher than the inlet water temperature threshold. A heat pump unit according to claim 1 or 2.

5. A heat pump unit including a heating means for heating water flowing from a hot water storage tank by heat exchange with a heat medium heated based on compression and expansion, and a control device for controlling a heating operation by the heating means, An information acquisition unit acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means, and an outlet water temperature indicating the temperature of water flowing from the heating means to the hot water storage tank, a normality determination unit that determines whether a hot water temperature indicating a temperature of water in the hot water tank is normally acquired; When the normality determination unit determines that the stored hot water temperature has not been acquired normally or may not be acquired normally, and when the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold, a set value update unit updates the target stored hot water temperature of the water in the hot water storage tank by the heating operation to a higher target stored hot water temperature. Heating method in case of abnormality.

6. A heat pump unit including a heating means for heating water flowing from a hot water storage tank by heat exchange with a heat medium heated based on compression and expansion, and a control device for controlling a heating operation by the heating means, an information acquisition unit that acquires an inlet water temperature indicating the temperature of water flowing from the hot water storage tank to the heating means and an outlet water temperature indicating the temperature of water flowing from the heating means to the hot water storage tank; a normality determination unit that determines whether a hot water temperature indicating a temperature of the water in the hot water tank is normally acquired; a set value update unit that updates a target hot water temperature in the hot water storage tank by the heating operation to a higher target hot water temperature when the normality determination unit determines that the hot water temperature has not been acquired normally or may not be acquired normally and the temperature difference between the outlet water temperature and the inlet water temperature is less than a temperature difference threshold value; The abnormality heating program is realized by causing the control device to execute the above.

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