JP5605296B2 - Hybrid water heater - Google Patents

Description

  The present invention relates to a hybrid hot water supply apparatus that heats a heat dissipation heat medium supplied to a heat dissipation device by a heat storage fluid stored in a tank and that can reheat the heat dissipation heat medium by an auxiliary heat source device.

  As a conventional technique, a water heater described in Patent Document 1 is known. The water heater is configured to exchange heat between the hot water in the tank heated by the heat pump device and the heat medium of the heat dissipating means with a heat exchanger for the heat dissipating means, to heat the heat medium, and for heating required by the heat dissipating means, etc. Ensure heat quantity. When the water heater radiates heat from the heat medium by the heat radiating means, that is, when the amount of remaining hot water in the tank is equal to or less than a predetermined amount of remaining hot water during heating, the water side inlet water temperature of the heat exchanger for the heat radiating means The difference between the water-side outlet water temperature of the hot water supply heat exchanger and the water-side outlet water temperature of the heat-dissipating heat exchanger is greater than the value obtained by integrating the water-side flow rate flowing through the heat-dissipating heat exchanger with the difference between the water-side outlet water temperature The number of revolutions of the compressor of the heat pump device is controlled so that the value obtained by integrating the water-side flow rate flowing through the hot water supply heat exchanger becomes larger. By this control, the water heater of Patent Document 1 has an effect that it is possible to reduce the occurrence of hot water in the tank even when heating for a long time is continued.

Japanese Patent No. 3724482

  In the water heater of Patent Document 1, when the amount of heat supplied to the heat medium of the heat radiating means in the heat exchanger for heat radiating means is larger than the amount of heat radiated to dissipate heat by the heat radiating means, The amount of heat stored in the tank is full. For this reason, the heat pump device repeats an operation state and a stop state (hereinafter, this is also referred to as “starting and stopping of the heat pump device”). As the start / stop of the heat pump device becomes more prominent, the efficiency of the heat pump device decreases, and there is a problem that the durability of the heat pump device decreases due to excessive start / stop. In particular, in the case of a hybrid hot water supply apparatus provided with an auxiliary heat source apparatus in addition to a heat pump apparatus that is a heating means, this problem becomes significant because the tank capacity is relatively small.

  Therefore, the present invention has been made in view of the above problems, and the object thereof is to reduce the frequency of the operation state and the stop state of the heat pump device during heat dissipation to the heat dissipation device without requiring complicated control. It is in providing the hybrid type hot-water supply apparatus which can do.

  In order to achieve the above object, the following technical means are adopted. That is, the invention relating to the hybrid type hot water supply apparatus according to claim 1 includes a tank (3) for storing heat storage fluid used for hot water supply and heat dissipation in the heat dissipation device (5), and a heat storage fluid in the tank. The heat pump device (1) in which the heating capacity for heating the heat source is adjusted to a multi-stage level, and the heat radiation heat that heats the heat medium by exchanging heat between the heat medium supplied to the heat radiation device and the heat storage fluid in the tank An exchanger (4), a heat medium outlet detecting means (32) for detecting a heat medium outlet temperature of the heat medium after being heated by the heat exchanger for heat dissipation, and a heat dissipation device after flowing out the heat exchanger for heat dissipation An auxiliary heat source device (6) for heating the heat medium before flowing into the heat pump, and a control device (100) for controlling the heating capacity of the heat pump device, and for controlling the heating operation by heat exchange in the heat exchanger for heat radiation, Is provided.

In the control device, the difference between the heat medium target outlet temperature of the heat radiating heat exchanger and the detected heat medium outlet temperature of the heat radiating heat exchanger is continuously equal to or higher than the first predetermined temperature for the first predetermined time or longer. In this case, the heating capacity of the heat pump device is increased to a higher capacity value, and the difference between the heat medium target outlet temperature of the heat radiating heat exchanger and the detected heat medium outlet temperature of the heat radiating heat exchanger is When the temperature is lower than the second predetermined temperature set to a value smaller than the first predetermined temperature continuously for the second predetermined time or longer, the heating capacity of the heat pump device is lowered to a lower capacity value , Control is performed so that the amount of heat supplied to the heat dissipation device by the heat pump device is equal to or less than the required amount of heat of the heat dissipation device .

According to this invention, when the detected value of the heat medium outlet temperature is low to some extent with respect to the heat medium target temperature, and the amount of heat dissipated is insufficient, the heating capacity of the heat pump device is increased to a higher capacity value, When the necessary amount of heat to be given to the heat radiating device is secured early, and the difference between the detected value of the heat medium outlet temperature and the heat medium target temperature is less than the second predetermined temperature, the heat capacity of the heat pump device is further reduced. The amount of heat supplied to the heat dissipation device by the heat pump device is controlled to be equal to or slightly lower than the required heat amount of the heat dissipation device. As a result, it is possible to reduce that the amount of heat stored in the tank immediately fills up when radiating heat to the heat radiating device.For example, the heat pump device can be operated without complicated control using the flow meter side or the like. Frequent switching between stops can be avoided. Therefore, the efficiency reduction of the heat pump device can be suppressed, and further the durability reduction can be suppressed.

  A second aspect of the present invention is the control device according to the first aspect, wherein the control device (100, 200) is configured to calculate a heat medium target outlet temperature of the heat radiating heat exchanger and a detected heat medium outlet temperature of the heat radiating heat exchanger. If the difference is equal to or higher than a predetermined first predetermined temperature continuously for a predetermined first predetermined time or more, the heating medium is further heated by the auxiliary heat source device, and the heat of the heat exchanger for heat dissipation is increased. A difference between the medium target outlet temperature and the detected heat medium outlet temperature of the heat-dissipating heat exchanger continues for a second predetermined time or longer and is set to a value smaller than the first predetermined temperature. When the temperature is lower than the temperature, heating of the heat medium by the auxiliary heat source device is stopped.

  According to the present invention, when the detected value of the heat medium outlet temperature is somewhat low with respect to the heat medium target temperature and the amount of radiated heat is insufficient, the heating capacity of the heat pump device is increased and the heating of the auxiliary heat source device is heated. Therefore, the required amount of heat to be given to the heat radiating device can be quickly provided. In addition, when the detected value of the heat medium outlet temperature approaches within the second predetermined temperature with respect to the heat medium target temperature, the heating of the auxiliary heat source device is stopped in addition to the reduction of the heating capacity of the heat pump device. The amount of heat given to the heat radiating device can be drastically reduced, and control that can suppress the shortage of heat with respect to the necessary heat amount of the heat radiating device can be performed.

  In addition, the code | symbol in the bracket | parenthesis of each said means has shown the correspondence with the specific means as described in embodiment mentioned later.

It is a schematic diagram which shows the structure of the hybrid type hot water supply apparatus which concerns on 1st Embodiment to which this invention is applied. It is a block diagram which shows the structure which concerns on control of the hybrid type hot water supply apparatus of 1st Embodiment. It is a flowchart which shows the process sequence at the time of the heating request | requirement in the hybrid type hot water supply apparatus of 1st Embodiment.

(First embodiment)
A first embodiment to which the present invention is applied will be described below. Drawing 1 is a mimetic diagram showing composition of a hybrid type hot-water supply device concerning a 1st embodiment. FIG. 2 is a block diagram showing a configuration relating to control of the hybrid hot water supply apparatus.

  As shown in FIG. 1, the hybrid hot water supply device is a hot water supply device that combines a heat pump unit 1 and an auxiliary heat source device 6 as a heating device capable of supplying heat. The hybrid hot water supply device is used, for example, for general household use, and uses hot water as a heat storage fluid stored in a tank to a hot water supply terminal to a kitchen, a washroom, a bathroom, etc. Etc.) and also has a function of exchanging heat between the hot water in the tank 3 and the heat medium of the heating device 5 by the heat exchanger 4 for heat radiation. Further, when a predetermined condition is satisfied, the temperature can be adjusted by further heating the heat medium or hot water supplied to the hot water supply terminal by the auxiliary heat source device 6.

  The hybrid water heater includes a tank 3 for storing water used for hot water supply and heat dissipation in the heating device 5, a heat pump unit 1 for heating water in the tank, and a heat medium and a tank supplied to the heating device 5. The heat-dissipating heat exchanger 4 that heats the water in the heat exchanger 3 to heat the heat medium, and the auxiliary heat source device that heats the heat medium that flows out of the heat-dissipating heat exchanger 4 and then flows into the heating device 5 6 and a first control device 100 that controls the operation of each part. The tank unit 2 includes a tank 3, a heat storage circulation circuit 10, a heat dissipation heat exchanger 4, a primary side circulation circuit 40, a part of the secondary side circulation circuit 50, various pipes, and various valves. The tank unit 2 and the heat pump unit 1 are installed integrally or separated from each other at the installation site. The first control device 100 controls the heating capability of the heat pump unit 1 and controls the heating operation by heat exchange in the heat dissipation heat exchanger 4, and can be configured by, for example, a tank unit control device.

  The heating capacity of the heat pump unit 1 is set to two or more levels. In the case of a three-stage heating capacity, if the capacity value increases in the order of level 1, level 2, and level 3, when performing a process of increasing the heating capacity to the upper level, the level may be increased from level 1 to level 2 or level 3. When the process of lowering the heating capacity to the lower stage is performed, the ability control to raise the level from level 2 to level 3 is performed, and the level is reduced from level 2 to level 1 or from level 3 to level 2 or level 1. The ability control to be performed will be implemented. Also, in the case of two-stage heating capacity, assuming that the capacity value increases in the order of level 1 and level 2, when performing the process of increasing the heating capacity to the upper stage, the capacity control to increase from level 1 to level 2 is performed. When performing the process of lowering the heating capacity to the lower level, the capacity control for reducing the level 2 to the level 1 is performed.

  The heat pump unit 1 is a heat pump device and is configured by connecting refrigeration cycle functional components such as at least a compressor, a heat / water refrigerant heat exchanger, an expansion valve, an evaporator, and an accumulator in an annular shape. The heat pump unit 1 constitutes a supercritical heat pump cycle in which, for example, carbon dioxide having a low critical temperature is used as a refrigerant, whereby the refrigerant pressure on the high pressure side becomes equal to or higher than the critical pressure of the refrigerant.

  When the heat pump cycle is constituted by a supercritical heat pump, hot water having a temperature higher than that of a general heat pump cycle, for example, about 85 ° C. to 90 ° C. can be stored in the tank 3. In the heat pump cycle, for example, a boiling operation is performed in which hot water in the tank 3 is boiled by using late-night power in an inexpensive late-night time zone. This boiling operation is performed so that the amount of heat based on the past record of the amount of heat used can be stored in the tank 3.

  Although not shown in the heat storage circulation circuit 10, an incoming temperature thermistor for detecting the temperature of water supplied to the water / refrigerant heat exchanger in the heat pump unit 1 and boiling at the outlet of the water-refrigerant heat exchanger. A boiling temperature thermistor for detecting the raised temperature and an electric pump are provided. And the detected temperature signal of each thermistor is output to the 1st control apparatus 100, and is used for control of a boiling operation.

  The tank 3 is a vertically long container that stores hot water for hot water supply and heat dissipation, and is made of a metal having excellent corrosion resistance, for example, stainless steel. Can be kept warm across. The hot water in the tank 3 circulates by operating the electric pump of the heat storage circuit 10. Thus, the hot water in the tank 3 heated by the water / refrigerant heat exchanger is sent to the upper part of the tank 3 through the heat storage circulation circuit 10, so that the upper part of the tank 3 moves from the upper side toward the lower side. Heat is stored sequentially so as to form a plurality of temperature layers.

  A plurality of tank water temperature thermistors 30 serving as water temperature sensors for detecting the amount of hot water stored and the temperature of the hot water stored are provided on the outer wall surface of the tank 3. Five thermistors TH1, TH2, TH3, TH4, and TH5 are provided. The detected temperature signals of these five thermistors are respectively input to the input circuit of the first control device 100, and can detect the temperature of the heat storage fluid and the amount of hot water at each water level. For example, when the detected temperature of a certain tank water temperature thermistor 30 exceeds a predetermined temperature that can be used as the amount of stored hot water, hot water that can be used for hot water supply is stored from the top of the tank 3 to the position of the tank water temperature thermistor 30. It will be. Moreover, according to the detection value of TH1 located in the uppermost part among the plurality of tank water temperature thermistors 30, the hot water temperature taken out to the hot water supply pipe 11 can be detected.

  The heat dissipation heat exchanger 4 includes a primary side passage 4a and a secondary side passage 4b provided so that fluids flowing inside each other exchange heat. The primary passage 4a is a flow path that communicates with the inside of the tank 3 and through which the hot water in the tank 3 flows. The primary side passage 4a and the secondary side passage 4b may have any form in which heat is exchanged between fluids flowing through the passages. For example, you may comprise by the double pipe structure in which one channel | path is formed in an inner side pipe | tube and the other channel | path is formed in the outer side pipe | tube which covers the outer side of an inner side pipe | tube. Moreover, it is preferable that the heat exchanger 4 for heat radiation is an opposed heat exchanger in which the flow directions of the fluid flowing through the primary side passage 4a and the secondary side passage 4b are opposed to each other.

  The tank 3 is connected to the primary-side passage 4a so as to form a primary-side circulation circuit 40 that is a circulation passage between the tank 3 and the primary-side passage 4a of the heat dissipation heat exchanger 4. The primary side circulation circuit 40 is connected to a lead-out port provided at the uppermost part of the tank 3. Further, the primary side circulation circuit 40 is connected to an introduction port provided at the lowermost part of the tank 3, and a heat storage fluid is connected to the primary side circulation circuit 40 in a flow path connecting the introduction port and the primary side passage 4 a. A primary side pump 41 for forced circulation is provided.

  The heating device 5, which is an example of a heat radiating means, is connected to the secondary side passage 4 b so as to form a secondary side circulation circuit 50 that is a circulation passage with the secondary side passage 4 b of the heat dissipation heat exchanger 4. Has been. The secondary-side circulation circuit 50 is provided with a secondary-side pump 51 that forcibly circulates the heat medium to the secondary-side circulation circuit 50 in a flow path that connects the heating device 5 and the secondary-side passage 4b. The secondary side circulation circuit 50 is provided with a secondary side heat exchanger outlet temperature thermistor 32 that detects the heat medium outlet temperature at the outlet from which the heat medium flows out of the heat dissipation heat exchanger 4. The temperature signal detected by the secondary side heat exchanger outlet temperature thermistor 32 is input to the input circuit of the first controller 100.

  The heat medium is, for example, water as a main component, and may contain a preservative, an antifreezing agent, LLC, and the like. Further, the heat medium may be a mixture of heat storage materials having cross heat, which is encapsulated by a method such as microcapsule, dispersed in water, or mixed in a thriller form.

  The secondary-side circulation circuit 50 is heated by the heat-dissipating heat exchanger 4 in a flow path connecting the secondary-side heat exchanger outlet temperature thermistor 32 and the heating device 5 provided at the outlet of the heat-dissipating heat exchanger 4. The heating unit 62 of the auxiliary heat source device 6 for reheating the heated heat medium after the heating is provided. The auxiliary heat source device 6 is not particularly limited as long as it is a device capable of heating a passing heat medium. For example, the auxiliary heat source device 6 is a small type that heats hot water supply water that passes through a combustion flame using a fuel such as gas or kerosene. A water heater, an electric heater or the like can be employed.

  Upstream of the water supply pipe 7 is connected to a water pipe, and city water (tap water) is introduced into the lowest inlet of the tank 3 and the hot water supply pipe 11. On the way to the tank 3 of the water supply pipe 7, a flow control valve 8 that can adjust the amount of water supplied into the tank 3 is provided. The first control device 100 adjusts the flow rate of the hot water discharged from the upper part of the tank 3 to the hot water supply pipe 11 by adjusting the opening of the flow control valve 8 to adjust the amount of water supplied into the tank 3. be able to.

  On the way to the hot water supply pipe 11 of the water supply pipe 7, a flow control valve 9 capable of adjusting the amount of water supplied from the upper part of the tank 3 to be mixed with the hot water is provided. The first control device 100 adjusts the amount of water to be introduced into the hot water supply pipe 11 by adjusting the opening degree of the flow regulating valve 9, and the flow rate ratio between the hot water and water from the upper part in the tank 3. To adjust the temperature of the hot water supply water. A water supply temperature thermistor 31 is provided in the water supply pipe 7. The feed water temperature thermistor 31 detects the temperature of city water, and the detected temperature signal is input to the input circuit of the first control device 100.

  The hot water supply pipe 11 is a pipe that connects the upper part of the tank 3 and a hot water supply terminal to a kitchen, a washroom, a bathroom, and the like. An electromagnetic valve 12 that opens and closes the passage of the hot water supply pipe 11 is provided in the middle of the hot water supply pipe 11 and downstream of the connecting portion with the water supply pipe 7. The upstream side and the downstream side of the electromagnetic valve 12 are connected so as to bypass the electromagnetic valve 12 by the auxiliary heating flow path 13. In the middle of the auxiliary heating channel 13, a channel unit heated by a heating unit 61 included in the auxiliary heat source device 6 is provided. The first control device 100 can discharge the hot water in the upper part of the tank 3 to the hot water supply terminal only through the hot water supply pipe 11 by controlling the electromagnetic valve 12 in the open state. In addition, the first control device 100 controls the electromagnetic valve 12 to be closed and controls the heating unit 61 to perform auxiliary heating, thereby bypassing the high-temperature water in the tank 3 from the electromagnetic valve 12. After flowing through the auxiliary heating channel 13 and heating by the heating unit 61 to add heat, the hot water can be discharged to the hot water supply terminal.

  A hot water supply temperature thermistor 33 for detecting the hot water supply temperature and a flow rate counter (not shown) are provided on the downstream side of the hot water supply pipe 11. The hot water temperature signal and the flow rate signal detected by the hot water temperature thermistor 33 and the flow rate counter are input to the input circuit of the first control device 100.

  The flow control valve 8, the flow control valve 9, and the solenoid valve 12 function as a temperature control valve that adjusts the temperature of hot water discharged to the hot water supply terminal side, and the first control device 100 or the second control device 200 is a tank. By controlling the flow rate ratio between the hot water and the feed water in the upper part of 3 and whether or not reheating is performed by the auxiliary heat source device 6, the temperature of the hot water supplied to the hot water supply terminal is controlled to be adjusted to the set temperature. The first control device 100 or the second control device 200 is based on the set temperature set by the remote controller 110 and the temperature information detected by the water supply temperature thermistor 31, the tank water temperature thermistor 30, and the hot water supply temperature thermistor 33. Thus, the operations of the flow control valves 8 and 9, the electromagnetic valve 12, and the auxiliary heat source device 6 are controlled.

  As shown in FIG. 2, the first control device 100 uses an input circuit to which signals from various switches on the remote controller 110 and communication signals from various thermistors 30 to 33 are input, and a signal from the input circuit. And a communication signal for controlling the operation of the heat pump unit 1, auxiliary heat source device 6, pumps 41 and 51, flow control valves 8 and 9, electromagnetic valve 12, and the like based on the calculation by the microcomputer. And an output circuit for outputting. The microcomputer incorporates a ROM or RAM as storage means and has a preset control program and an updatable control program.

  The second control device 200 has the same configuration as the first control device 100, but mainly has a function of controlling the operation of the auxiliary heat source device 6. The second control device 200 is a communication that controls the operation of the heating units 61 and 62 of the auxiliary heat source device 6 when a predetermined condition is satisfied when an operation command for the heating device 5 is input by a user's remote operation. Output a signal. The first control device 100 and the second control device 200 can share information on devices managed and controlled by communicating with each other.

  In addition, the first control device 100 and the second control device 200 may be configured by a single integrated control device. Therefore, the operation of the heating units 61 and 62 of the auxiliary heat source device 6 can be controlled by the integrated control device. Further, the remote controller 110 is provided with an operation unit related to hot water supply such as an automatic operation switch and a hot water supply set temperature switch, but a heating switch for operating the heating device 5 may be provided.

  Next, the operation of the hybrid hot water supply apparatus when there is a request for operation of the heating device 5 will be described with reference to FIG. FIG. 3 is a flowchart for explaining a processing procedure at the time of a heating request in the hybrid hot water supply apparatus.

  When the first control device 100 receives an operation request command for the heating device 5 and starts the heating operation by the heat pump unit 1, first, in step 10, the heat medium that circulates in the secondary side circulation circuit 50 is used for heat dissipation. The heat medium target outlet temperature at the outlet that has flowed out of the heat exchanger 4 is determined. The heat medium target outlet temperature is a target temperature of the heat medium outlet temperature detected by the secondary side heat exchanger outlet temperature thermistor 32. The heat medium target outlet temperature is determined based on, for example, the set temperature of the heating device 5 set by the user. In this case, the heat medium target outlet temperature is determined, for example, to a temperature that is a predetermined temperature higher than the set temperature of the heating device 5. The heat medium target outlet temperature is an important parameter that is also used in the determination of Step 30 and Step 40 described later. Here, the heating capability of the heat pump unit 1 is assumed to start from a high capability level in consideration of advancing the rise of the heating capability. Here, as an example, when the heating capacity of the heat pump unit 1 is set to two levels of 4.5 kW and 6 kW, the heating capacity of the heat pump unit 1 at the start of operation is set to the higher 6 kW. To do. Further, the heating capability is not limited to a specific level among the capability levels possessed by a plurality of stages, but may be the lowest capability or the intermediate heating capability level among the capability levels possessed by the heat pump unit 1 in a plurality of stages. .

  Further, in step 20, the primary side pump 41 and the secondary side pump 51 are started, the high temperature water in the tank 3 is circulated by the primary side circulation circuit 40, and the heat medium is circulated by the secondary side circulation circuit 50.

  As described above, in step 20, the heat amount of the high-temperature water boiled up in the upper portion of the tank 3 by the heating capability of the heat pump unit 1 is converted into heat from the high-temperature water circulating in the primary side circulation circuit 40 by the heat-dissipating heat exchanger 4. Give to the medium. As a result, the heat medium outlet temperature detected by the secondary heat exchanger outlet temperature thermistor 32 rises. The amount of heat of the high-temperature water supplied to the heat medium is radiated to the heating device 5 by the heat medium circulating in the secondary side circulation circuit 50, and the heating capacity of the heating device 5 is improved.

  When the amount of heat supplied to the heat medium by the heat pump unit 1 is thus implemented, in step 40, the difference between the heat medium target outlet temperature and the heat medium outlet temperature detected by the secondary heat exchanger outlet temperature thermistor 32 is calculated. It is determined whether or not a state where ΔT is 5 ° C. or more, which is an example of a predetermined first predetermined temperature, continues for a predetermined first predetermined time or more. If it is determined as YES in step 30, there is a gap between the heat medium target outlet temperature and the heat medium outlet temperature, and it is necessary to strengthen the heat supply so that the heating device 5 reaches the required heating capacity quickly. . For this reason, the 1st control apparatus 100 raises the heating capability of the heat pump unit 1 to the upper level in step 32, and increases an output. For example, in step 32, the heating capacity of the heat pump unit 1 that was 4.5 kW is increased to 6 kW.

  In a situation where not much time has passed after the start of heating and the start of operation of the heat pump unit 1, the heating capacity of the heat pump unit 1 is at a high level, and the capacity level may not be increased in step 32. In this case, in step 32, a process for maintaining the heating capacity level is performed. And after performing the process which reduces a heating capability by step 42 mentioned later, when there is no status change, such as heating, a heating capability is not increased, but when there exists the said status change, it is step 50 to step. Returning to 30, a determination of YES is made, and heating capacity may be increased in step 32. This situation change means that after the heat pump unit 1 starts operation, the amount of heat released from the heating device 5 increases due to an increase in the number of heating devices (increase in the number of devices), the heating set temperature being set high, or the like. This is a case where the outside air temperature is lowered. In such a situation, a determination of YES is made in step 30, and the process of step 32 is performed.

  Further, in step 34, the auxiliary heat source device 6 is operated, and the heat medium heated by the heat radiating heat exchanger 4 is reheated by the heating unit 62. For example, the operation of the auxiliary heat source device 6 is executed by the second control device 200 that receives a command from the first control device 100. The reheating of the heat medium by the auxiliary heat source device 6 further enhances the supply of heat to the heating device 5 and allows the heating device 5 to reach the heating capacity more quickly. Then, in step 50, it is determined whether or not there is an operation stop request for the heating device 5. If it is determined that there is an operation stop request, this flowchart is ended. If there is no operation stop request, the process returns to step 30 and again ΔT The state of is determined.

  If it is determined as NO in step 30, then in step 40, the state where ΔT is less than 1 ° C., which is an example of a predetermined second predetermined temperature, is equal to or longer than a predetermined second predetermined time. It is determined whether or not it continues. If it is determined as YES in step 40, the temperature difference between the heat medium target outlet temperature and the heat medium outlet temperature is small, and the heat medium temperature can exceed the heat medium target temperature in a short time if the heating capacity is maintained as it is. High nature. Therefore, the first control device 100 reduces the output by reducing the heating capacity of the heat pump unit 1 to a lower level in step 42. For example, in step 42, the heating capacity of the heat pump unit 1 is reduced from 6 kW to 4.5 kW. By this process, the heat medium outlet temperature can be gradually brought close to the heat medium target outlet temperature, and the amount of heat supplied by the heat pump unit 1 can be suppressed to the amount of heat required by the heating device. Therefore, even when the amount of heat of the heating device 5 that suppresses the on / off phenomenon of the heat pump device, which is a problem, is insufficient, the amount of insufficient heat can be suppressed to a small level.

  Further, in step 44, the operation of the auxiliary heat source device 6 is stopped, and the amount of heat given to the heating device 5 is made smaller. By suppressing the operation of the auxiliary heat source device 6, the effect of suppressing the supply of heat to the heating device 5 can be further enhanced. Then, in step 50, it is determined whether or not there is a request for stopping the operation of the heating device 5. If it is determined that there is a request for stopping the operation, the present flowchart is terminated. The state of is determined.

  If it is determined NO in step 40, the temperature difference between the heat medium target outlet temperature and the heat medium outlet temperature is 1 ° C. or more and less than 5 ° C., and it is too early to reduce the heating capacity of the heat pump unit 1. It is determined that there is, and the process proceeds to step 50. In step 50, it is determined whether or not there is a request for stopping the operation of the heating device 5. If it is determined that there is a request for stopping the operation, this flow chart is ended. judge.

  Below, the effect which the hybrid type hot-water supply apparatus of 1st Embodiment brings is demonstrated. According to the hybrid hot water supply apparatus, the first controller 100 determines that the difference between the heat medium target outlet temperature of the heat dissipating heat exchanger 4 and the heat medium outlet temperature of the heat dissipating heat exchanger 4 is the first predetermined time. If the temperature is 5 ° C. or more, which is an example of the first predetermined temperature, the heating capacity of the heat pump unit 1 is increased to a higher capacity value (step 32). In the first control device 100, the difference between the heat medium target outlet temperature and the heat medium outlet temperature continues for the second predetermined time or longer and is set to a value smaller than the first predetermined temperature. When the temperature is lower than 1 ° C., which is an example of temperature, the heating capacity of the heat pump unit 1 is lowered to a lower capacity value (step 42).

  According to this control, when the detected heat medium outlet temperature is somewhat lower than the heat medium target temperature and the heat radiation amount of the heat medium to the heating device 5 is insufficient, the heating capacity of the heat pump unit 1 Is increased to a higher capacity value (for example, 4.5 kW → 6 kW), and the necessary amount of heat to be given to the heating device 5 is quickly secured. In addition, when the detected heat medium outlet temperature approaches a range lower than a second predetermined temperature (for example, 1 ° C.) with respect to the heat medium target temperature, the heating capacity of the heat pump unit 1 is set to a lower capacity value. (For example, 6 kW → 4.5 kW), and the amount of heat supplied to the heating device 5 by the heat pump unit 1 is controlled to be equal to or slightly lower than the necessary heat amount of the heating device 5.

  Thereby, since it can reduce that the heat storage amount of the tank 3 becomes full immediately at the time of heat dissipation to the heating equipment 5, for example, the complicated using the inlet temperature of the heat exchanger, the outlet temperature, the flow meter side, etc. It is possible to avoid frequent switching between operation and stop of the heat pump unit 1 (starting / stopping of the heat pump device described above) without requiring measurement or measuring devices such as sensors. Therefore, according to the hybrid hot water supply apparatus of the present embodiment, it is possible to suppress a decrease in the coefficient of performance (COP) of the heat pump cycle by a small temperature detection and control device, and furthermore, the life and durability of the heat pump unit 1 can be reduced. The decrease can also be suppressed.

  In particular, in the case of a hybrid hot water supply apparatus provided with an auxiliary heat source device in addition to a heat pump device as a heating means, the problem of the start and stop of the heat pump device becomes more remarkable because the capacity of the tank is relatively small. Therefore, the above-described effect brought about by the hybrid hot water supply apparatus of the present embodiment becomes enormous.

  For example, in the control described in the above-mentioned conventional patent document 1, since it is necessary to measure the amount of water flowing through the heat exchanger, it is necessary to estimate the flow rate from a measuring device such as a flow rate sensor or the pump rotational speed. A flow sensor or the like is accompanied by an increase in the cost of the apparatus, and the flow rate estimation needs to be calculated in consideration of the pressure loss of the pipe, and the accuracy of the flow rate estimation cannot always be guaranteed. Therefore, according to the hybrid hot water supply apparatus of the present embodiment, such problems can be solved and the start and stop of the heat pump apparatus can be avoided.

  Further, the first control device 100 or the second control device 200 continues the difference ΔT between the heat medium target outlet temperature and the detected heat medium outlet temperature of the heat-dissipation heat exchanger 4 for a first predetermined time or more. If the temperature is equal to or higher than the first predetermined temperature (for example, 5 ° C.), the heating medium is further heated by the auxiliary heat source device 6 (step 44). Further, the difference ΔT between the heat medium target outlet temperature and the detected heat medium outlet temperature of the heat exchanger 4 for heat dissipation is continuously set for a second predetermined time or more and is set to a value smaller than the first predetermined temperature. If the temperature is lower than the second predetermined temperature (for example, 1 ° C.), heating of the heat medium by the auxiliary heat source device 6 is stopped (step 54).

  According to this control, when the detected heat medium outlet temperature is low to some extent with respect to the heat medium target temperature and the heat radiation heat amount of the heat medium to the heating device 5 is insufficient, the heating capacity of the heat pump unit 1 is reduced. In addition to the increase (for example, 4.5 kW → 6 kW), the amount of heat to be supplied to the heating device 5 can be quickly provided because the amount of supplied heat is supplemented by heating the auxiliary heat source device 6. In addition, when the detected heat medium outlet temperature approaches a range lower than the second predetermined temperature (for example, 1 ° C.) with respect to the heat medium target temperature, the heating capacity of the heat pump unit 1 is decreased (for example, 6 kW). (→ 4.5 kW) In addition to stopping the heating of the auxiliary heat source device 6, the amount of heat given to the heating device 5 can be drastically reduced, and the control that can suppress the insufficient heat amount of the heating device 5 with respect to the necessary heat amount is implemented. can do.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  Further, in the above embodiment, the hybrid hot water supply device is stored in the first control device 100 when performing an operation based on the past record of the amount of heat used in the boiling operation using midnight power in the midnight time zone. The operation results for a predetermined period (for example, one week) are stored in advance as predetermined operation information (model operation information) at the time of shipment of the device from the factory, and this initial value is updated every time a use record of the hot water supply device is added. By doing so, it may be adapted to the actual usage of the user.

  Further, the working refrigerant flowing through the heat pump cycle of the heat pump unit 1 is not limited to carbon dioxide, but may be other refrigerants such as Freon.

1 ... Heat pump unit (heat pump device)
3 ... Tank 4 ... Heat exchanger for heat dissipation 5 ... Heating equipment (heat dissipation device)
6 ... Auxiliary heat source device 32 ... Secondary side heat exchanger outlet temperature thermistor (heat medium outlet temperature detection means)
100: First control device (control device)
200: Second control device (control device)

Claims (2)

A tank (3) for storing a heat storage fluid used for hot water supply and heat dissipation in the heat dissipation device (5);
A heat pump device (1) in which the heating capacity for heating the heat storage fluid in the tank is adjusted to a multi-stage level;
A heat exchanger for heat dissipation (4) that heat-exchanges the heat medium supplied to the heat dissipation device and the heat storage fluid in the tank to heat the heat medium;
A heat medium outlet detecting means (32) for detecting a heat medium outlet temperature of the heat medium after being heated by the heat dissipation heat exchanger;
An auxiliary heat source device (6) for heating the heat medium before flowing into the heat dissipation device after flowing out of the heat dissipation heat exchanger;
A control device (100) for controlling the heating capability of the heat pump device, and for controlling a heating operation by heat exchange in the heat dissipation heat exchanger,
With
The controller is
The difference between the heat medium target outlet temperature of the heat-dissipating heat exchanger and the detected heat-medium outlet temperature of the heat-dissipating heat exchanger is continuously determined for a predetermined first time. When the temperature is equal to or higher than the predetermined temperature, the heating capacity of the heat pump device is increased to a higher capacity value,
The difference between the heat medium target outlet temperature of the heat radiating heat exchanger and the detected heat medium outlet temperature of the heat radiating heat exchanger continues for a predetermined second predetermined time or more, and the first When the temperature is lower than a second predetermined temperature set to a value lower than the predetermined temperature, the heating capacity of the heat pump device is lowered to a lower capacity value, and the amount of heat supplied to the heat dissipation device by the heat pump device is reduced. A hybrid hot water supply apparatus that is controlled to be equal to or less than a required heat amount of the heat radiating device. The control device (100, 200)
The difference between the heat medium target outlet temperature of the heat-dissipating heat exchanger and the detected heat-medium outlet temperature of the heat-dissipating heat exchanger is continuously determined for a predetermined first time. When the temperature is equal to or higher than the predetermined temperature, the heating medium is heated by the auxiliary heat source device,
The difference between the heat medium target outlet temperature of the heat radiating heat exchanger and the detected heat medium outlet temperature of the heat radiating heat exchanger continues for a predetermined second predetermined time or more, and the first 2. The hybrid hot water supply device according to claim 1, wherein heating of the heat medium by the auxiliary heat source device is stopped when the temperature is lower than a second predetermined temperature set to a value smaller than the predetermined temperature. .

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