KR101343445B1 - Hybrid hot-water supply apparatus - Google Patents

Abstract

In a hybrid hot-water supplying apparatus, a controller (100) increases the heating capacity of a heat pump unit (1) to a value at a higher level when a difference between a targeted outlet temperature of a heat carrier of a heat exchanger (4) for radiating heat and an outlet temperature of the heat carrier of the heat exchanger (4) for radiating heat is continuously above 5 deg C. for a first fixed hour or more. The controller (100) decreases the heating capacity of the heat pump unit (1) to a value at a lower level when a difference between the targeted outlet temperature of the heat carrier and the outlet temperature of the heat carrier is continuously under 1 deg C. for a second fixed hour or more. Therefore, the hybrid hot-water supplying apparatus can reduce the frequency in the operating and stopping state of a heat pump device during heat radiation to a heat radiating device. [Reference numerals] (AA) Start;(BB,DD,FF) No;(CC,EE,GG) Yes;(HH) End;(S10) Determine a targeted outlet temperature of a heat carrier;(S20) Pumps (41, 51): Operating;(S30) Does ΔT >=5 deg C. continue for a fist fixed hour?;(S32) Increase H/P unit output;(S34) Auxiliary heat source: On;(S40) Does T< 1 deg C. continue for a second fixed hour?;(S42) Decrease H/P unit output;(S44) Auxiliary heat source: Off;(S50) Has heating stopped?

Description

Hybrid hot water supply device {HYBRID HOT-WATER SUPPLY APPARATUS}

The present disclosure relates to a hybrid hot water supply device that heats a heat dissipation medium supplied to a heat dissipation device by a heat storage fluid stored in a tank, and enables reheating of the heat dissipation heat medium by an auxiliary heat source device.

As a prior art, the water heater described in patent document 1 (Japanese Patent No. 3724482) is known. The hot water heater heats the hot water in the tank heated by the heat pump apparatus and the heat medium of the heat dissipation means in the heat exchanger for heat dissipation means to heat the heat medium, and ensures the amount of heat such as heating required by the heat dissipation means. When the hot water heater radiates heat from the heat medium in the heat radiating means, that is, when the amount of residual water in the tank becomes less than the predetermined amount of residual water during heating, the water heater and the water side inlet water temperature of the heat exchanger for heat radiating means The value of the water flow rate flowing through the hot water supply heat exchanger to the difference between the water outlet water temperature of the hot water supply heat exchanger and the water outlet water temperature of the heat exchanger heat exchanger is greater than the value obtained by integrating the water flow rate through the heat exchanger heat exchanger to the difference of the water side water temperature. The rotation speed of the compressor of the heat pump apparatus is controlled to increase. By this control, the hot water heater of Patent Literature 1 achieves the effect of reducing the occurrence of hot water disconnection in the tank even when heating for a long time is continued.

Japanese Patent No. 3724482

In the hot water heater of the patent document 1, when the amount of heat supplied to the heat medium of the heat dissipation means in the heat exchanger for heat dissipation means is larger than the heat dissipation heat required for heat dissipation in the heat dissipation means, the heat storage amount of the tank becomes full. For this reason, the heat pump apparatus repeats the operation state and the stop state (hereinafter, also referred to as "starting oscillation stop of the heat pump apparatus"). As the oscillation stop of the heat pump device becomes remarkable, the efficiency of the heat pump device decreases, and a problem that the excessive durability of the oscillation stop causes the durability of the heat pump device to occur. In particular, in the case of the hybrid hot water supply device including the auxiliary heat source device in addition to the heat pump device as the heating means, this problem becomes remarkable because the tank capacity is relatively small.

Accordingly, the present disclosure has been made in view of the above problems, and its object is not to require complicated control, and a hybrid hot water supply apparatus capable of reducing the frequency of operating and stopping states of the heat pump device at the time of heat dissipation to the heat dissipation device. Is to provide.

According to the first aspect of the present disclosure, a hybrid hot water supply device includes a tank for storing a heat storage fluid used for a hot water supply and a heat dissipation in a heat dissipation device, and a heating capacity for heating the heat storage fluid in the tank at multiple levels. A heat pump for controlling the heat medium, a heat exchanger for heating the heat medium by heat-exchanging the heat medium supplied to the heat dissipation device, and the heat storage fluid in the tank, and a heat medium outlet for detecting the heat medium outlet temperature of the heat medium after being heated by the heat exchanger The temperature detection means, the auxiliary heat source device for heating the heat medium before flowing into the heat radiating device after the heat radiating heat exchanger flows out, and the heating capacity of the heat pump device are controlled, and the heating by heat exchange in the heat radiating heat exchanger is performed. A control device for controlling the operation is provided.

When the difference between the heat medium target outlet temperature of the heat exchanger heat exchanger and the detected heat medium heat outlet temperature of the heat exchanger for heat dissipation is more than the first predetermined temperature for more than a first predetermined time, the control device further increases the heating capability of the heat pump apparatus. If the difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger is lower than the second predetermined temperature set to a value smaller than the first predetermined temperature for more than a second predetermined time. In the following, the heating capacity of the heat pump device is lowered to the lower capacity value.

For example, when the heat radiation outlet temperature is somewhat lower than the heat medium target temperature and the heat dissipation heat is insufficient, the heat capacity of the heat pump device is increased to the upper capacity value to give the heat dissipation device faster. If 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 heating capacity of the heat pump device is lowered to the lower capacity value, and the supply device to the heat radiating device by the heat pump device is provided. Is controlled to be equal to or slightly below the required heat of the heat dissipation device. As a result, since the heat storage amount of the tank is immediately filled at the time of heat dissipation to the heat dissipation device, it is possible to reduce the complexity between the operation and the stop of the heat pump device without requiring complicated control using, for example, flow rate measurement. Frequent conversions can be avoided. Therefore, the efficiency fall of a heat pump apparatus can be suppressed, and also durability fall can be suppressed.

According to the second aspect of the present disclosure, the control device is a temperature difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger being more than or equal to the first predetermined time which is continued over a predetermined first predetermined time. In this case, heating of the heat medium by the auxiliary heat source device is performed again, and the difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium outlet temperature of the heat dissipation heat exchanger continues for more than a second predetermined time and is greater than the first predetermined temperature. When the temperature is lower than the second predetermined temperature set to a small value, the heating of the heat medium by the auxiliary heat source device is stopped.

For this reason, when the detected value of the heat medium outlet temperature is somewhat low with respect to the heat medium target temperature, and the heat dissipation heat amount is insufficient, in addition to the increase in the heating capacity of the heat pump apparatus, the supply heat amount is compensated by the heating of the auxiliary heat source device. It can quickly provide the required heat to be given to the heat sink. In addition, when the detected value of the heat medium outlet temperature approaches the heat medium target temperature within the second predetermined temperature, the heating of the auxiliary heat source device is stopped in addition to the reduction in the heating capacity of the heat pump device. It is possible to implement a control that can be drastically lowered to suppress an insufficient heat amount with respect to the required heat amount of the heat radiating device.

FIG. 1: is a schematic diagram which shows the structure of the hybrid hot water supply apparatus which concerns on 1st Embodiment.
FIG. 2 is a block diagram showing a configuration according to control of the hybrid hot water supply device of the first embodiment.
3 is a flowchart showing a processing procedure at the time of a heating request in the hybrid hot water supply device of the first embodiment.

(First Embodiment)

A first embodiment to which the present invention is applied will be described below. FIG. 1: is a schematic diagram which shows the structure of the hybrid hot water supply apparatus which concerns on 1st Embodiment. 2 is a block diagram showing a configuration related to control of a hybrid hot water supply device.

As shown in FIG. 1, a hybrid hot water supply device is a hot water supply device in which a heat pump unit 1 and an auxiliary heat source device 6 are combined as a heating device capable of supplying heat. The hybrid hot water supply device is, for example, used for general household use, and supplies hot water as a heat storage fluid stored in a tank to a hot water supply terminal (for example, a sink stopper, a faucet, a bath, etc.) to a kitchen, a sink, a bathroom, and the like. In addition, it has a function of heat-exchanging the hot water in the tank 3 and the heat medium of the heating apparatus 5 by the heat exchanger 4 for heat radiation. When the predetermined condition is satisfied, the auxiliary heat source device 6 can further heat and heat the hot water supplied to the heat medium or the hot water supply terminal.

The hybrid hot water supply device 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 heating device (5). After heat-exchanging the heat medium to be supplied and the water in the tank 3 to heat the heat medium, the heat-exchanging heat exchanger 4 and the heat-exchanging heat exchanger 4 flow out, and then heat the heat medium before flowing into the heating device 5. At least a first control device 100 for controlling 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 part of the primary side circulation circuit 40, a secondary side circulation circuit 50, various piping and various valves. It includes. 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 also controls the heating operation by heat exchange in the heat dissipation heat exchanger 4, for example, to the tank unit control device. It can be configured by.

The heating capacity of the heat pump unit 1 is set to two or more levels. In the case of the three-stage heating capability, if the capability value increases in the order of level 1, level 2, and level 3, the heating capability is increased from level 1 to level 2 or level 3 when the processing to raise the heating capability to the upper end is performed. Or control of raising from level 2 to level 3, and reducing the level from level 2 to level 1, or from level 3 to level 2 or level 1 when performing a process of lowering the heating capacity to a lower level. Will be implemented. In the case of the heating capability of the two stages, if the capability value increases in the order of level 1 and level 2, the capability control to raise the heating capability to the uppermost level is performed when the process of raising the heating capability to the upper end is performed. In addition, when performing the process of lowering the heating capacity to the lower end, the capability control to reduce the level from level 2 to level 1 is performed.

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

When the heat pump cycle is constituted by a supercritical heat pump, hot water at a temperature higher than a general heat pump cycle, for example, about 85 ° C to 90 ° C, can be stored in the tank 3. The heat pump cycle performs, for example, a boiling operation in which hot water in the tank 3 is boiled using late night electric power in a late night time zone having a low rate. This boiling operation is carried out so that the heat amount based on the past performance of the heat quantity used can be stored in the tank 3.

Although not shown in the heat storage circulation circuit 10, an inlet temperature thermistor which detects a temperature of water supplied to the water / refrigerant heat exchanger in the heat pump unit 1, and a boiling temperature at the outlet of the water-refrigerant heat exchanger is detected. A boiling temperature thermistor and an electric pump are provided. The detected temperature signal of each thermistor is output to the first control device 100 and used for the control of boiling operation.

The tank 3 is a vertically long container for storing hot water for hot water supply and heat dissipation. The tank 3 is made of a metal having excellent corrosion resistance, for example, made of stainless steel. I can keep warm over. The hot water in the tank 3 circulates by operating the electric pump of the heat storage circulation circuit 10. As a result, 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, and thus a plurality of hot water from the upper side to the lower side in the tank 3 It is thermally stored in turn to form a temperature layer of.

On the outer wall surface of the tank 3, a plurality of tank water temperature thermistors 30, which are water temperature sensors for detecting low water volume and low water temperature, are provided. In the present embodiment, TH1 and TH2 are sequentially arranged from the top at approximately equal intervals in the vertical direction. Five thermistors are installed, TH3, TH4 and TH5. The detection temperature signals of these five thermistors are input to the input circuit of the first control device 100, respectively, and can detect the temperature and the amount of hot water of the heat storage fluid at each level. For example, when the detection temperature of a certain tank water temperature thermistor 30 has exceeded the predetermined temperature which can be used as the amount of heat of the hot water, it can be used for the hot water supply from the top of the tank 3 to the position of the tank water temperature thermistor 30. Hot water is stored. Moreover, according to the detection value of TH1 located in the uppermost part of the some tank water temperature thermistor 30, the tapping temperature taken out to the hot water supply piping 11 can be detected.

The heat exchanger 4 for heat dissipation is provided with the primary side passage 4a and the secondary side passage 4b provided so that the fluid which flows inside each other may heat-exchange. The primary side passage 4a communicates with the inside of the tank 3 and is a flow path through which warm water flows in the tank 3. The primary side passage 4a and the secondary side passage 4b may be in a form in which heat exchange is performed between the fluids flowing through the respective passages. For example, one passage may be formed in the inner tube, and the other passage may be configured in a double tube structure formed in the outer tube covering the outer side of the inner tube. Moreover, it is preferable that the heat exchanger 4 for heat dissipation is an opposed heat exchanger in which the flow direction of the fluid which flows each of the primary side passage 4a and the secondary side passage 4b opposes.

The tank 3 is connected to the primary side passage 4a so as to form the primary side circulation circuit 40 which is a circulation flow path between the primary side passage 4a of the heat exchanger 4 for heat dissipation. This primary side circulation circuit 40 is connected to the outlet port provided in the lowest part of the tank 3. Moreover, the primary side circulation circuit 40 is connected to the inlet port provided in the lowermost part of the tank 3, and the heat storage fluid is connected to the primary side circulation circuit 40 to the flow path which connects this inlet port and the primary side passage 4a. ) Is provided with a primary pump 41 forcibly circulating.

The heating device 5 which is an example of the heat dissipation means is connected to the secondary side passage 4b so as to form a secondary side circulation circuit 50 which is a circulation flow path between the secondary side passage 4b of the heat dissipation heat exchanger 4. have. The secondary side circulation circuit 50 is provided with the secondary side pump 51 which forcibly circulates a heat medium to the secondary side circulation circuit 50 in the flow path which connects the heating device 5 and the secondary side passage 4b. . The secondary side heat exchanger outlet temperature thermistor 32 which detects the heat medium outlet temperature is provided in the outlet by which the heat medium flowed out the heat exchanger 4 for heat dissipation in the secondary side circulation circuit 50. The temperature signal detected by the secondary side heat exchanger outlet temperature thermistor 32 is input to the input circuit of the first control device 100.

In addition, the heat medium may be water, for example, and may contain a preservative, an antifreezing agent, LLC, etc. In addition, the heat medium may seal the heat storage material having high specific heat by a method such as a microcapsule, may be dispersed in water and mixed, or may be mixed in a slurry form.

The secondary circuit circulating circuit 50 has a flow path connecting the secondary side heat exchanger outlet temperature thermistor 32 and the heating device 5 installed at the outlet of the heat exchanger heat exchanger 4, The heating part 62 of the auxiliary heat source device 6 which reheats the heat medium after being heated is provided. The auxiliary heat source device 6 is not particularly limited as long as it is a device capable of heating the heat medium passing therethrough, but for example, a small hot water heater that heats the water for hot water passing through the interior using combustion salts such as gas and kerosene. And an electric heater can be employed.

The upstream of the water supply pipe 7 is connected to a water supply pipe, and water (water supply) operated in the city is introduced into the inlet of the lowermost part of the tank 3 and the water supply pipe 11. On the way to the tank 3 of the water supply pipe 7, a flow rate regulating valve 8 capable of adjusting the amount of water supplied into the tank 3 is provided. The first control device 100 adjusts the amount of water introduced into the tank 3 by adjusting the opening degree of the flow rate regulating valve 8 to adjust the flow rate of tapping water from the upper portion of the tank 3 to the hot water supply pipe 11. Can be.

On the way to the hot water supply pipe 11 of the water supply pipe 7, a flow rate adjustment valve 9 is provided that can adjust the amount of water to be mixed with tapping water from the upper portion of the tank 3. The first control device 100 regulates the flow rate of the hot water and the water from the top in the tank 3 by adjusting the amount of water introduced into the hot water supply pipe 11 by adjusting the opening degree of the flow rate adjusting valve 9. The temperature of the hot water can be adjusted. The water supply temperature thermistor 31 is provided in the water supply pipe 7. The water supply temperature thermistor 31 detects the temperature of tap water operated in the city, 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 which connects the hot water supply terminal to the upper part of the tank 3, and to a kitchen, a wash basin, and a bathroom. The solenoid valve 12 which opens and closes the channel | path of the hot water supply pipe 11 is provided in the middle of the piping 11 for hot water supply rather than the connection part with the water supply pipe 7. The upstream side and the downstream side of the solenoid valve 12 are connected to bypass the solenoid valve 12 by the auxiliary heating flow path 13. In the middle of this auxiliary heating flow path 13, a flow path part heated by the heating part 61 included in the auxiliary heat source device 6 is provided. By controlling the solenoid valve 12 to the open state, the 1st control apparatus 100 can tap the hot water of the upper part in the tank 3 to a hot water supply terminal only through the hot water supply piping 11. Moreover, the 1st control apparatus 100 controls the solenoid valve 12 to the closed state, and controls the heating part 61 to auxiliary-heat, so that the high temperature water of the upper part in the tank 3 may be bypassed. After passing, it flows to the auxiliary heating flow path 13, and it heats in the heating part 61, adds a quantity of heat, and can hot-water at a hot water supply terminal.

On the downstream side of the hot water supply pipe 11, a hot water temperature thermistor 33 for detecting the hot water temperature and a flow counter (not shown) are provided. 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 regulating valve 8, the flow regulating valve 9, and the solenoid valve 12 fulfill the function of the temperature regulating valve which adjusts the hot water tapping on the hot water supply terminal side, and controls the first control device 100 or the second control. The apparatus 200 is controlled to adjust the tapping temperature to the hot water supply terminal to the set temperature by controlling the flow rate ratio of the hot water and the water supply in the upper part of the tank 3 and whether or not reheating is performed by the auxiliary heat source device 6. The first control device 100 or the second control device 200 is connected to the set temperature set by the remote controller 110 or the like, the water supply temperature thermistor 31, the tank water temperature thermistor 30, and the hot water temperature thermistor 33. The operation of the flow regulating valves 8 and 9, the solenoid valve 12, and the auxiliary heat source device 6 is controlled based on the temperature information detected by the same.

As shown in FIG. 2, the first control device 100 includes an input circuit into which signals from various switches on the remote controller 110 and communication signals from the various thermistors 30 to 33 are input, and signals from the input circuit. A microcomputer for performing various calculations using the microprocessor, the heat pump unit 1, the auxiliary heat source device 6, the pumps 41 and 51, the flow regulating valves 8 and 9, The output circuit which outputs the communication signal which controls operation | movement of the solenoid valve 12 etc. is provided. The microcomputer has a built-in ROM or RAM as a storage means, and has a preset control program or an updateable control program.

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

In addition, you may comprise the 1st control apparatus 100 and the 2nd control apparatus 200 by the integrated single control apparatus. Therefore, the operation of the heating sections 61 and 62 of the auxiliary heat source device 6 can be controlled by the integrated control device. Moreover, although the operation part related to hot water supply, such as an automatic operation switch and a hot water supply setting temperature switch, is provided in the remote controller 110, the heating switch which drives the heating apparatus 5 may be provided.

Next, operation | movement of the hybrid type hot water supply apparatus at the time of the operation request of the heating device 5 is demonstrated with reference to FIG. 3 is a flowchart for explaining a processing procedure at the time of a heating request in the hybrid hot water supply device.

When the 1st control apparatus 100 receives the instruction | command of the operation | movement request of the heating apparatus 5, and heat-operation operation by the heat pump unit 1 is started, first, in step 10, the secondary side circulation circuit 50 is carried out. The heat medium target outlet temperature at the outlet through which the heat dissipating heat exchanger 4 flows out is determined for the heat medium to be circulated. 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 to be, for example, a temperature which is a predetermined temperature higher with respect to the set temperature of the heating device 5. The heat medium target outlet temperature is an important parameter also used in the determination of steps 30 and 40 described later. Here, the heating capability of the heat pump unit 1 shall be started from a high capability level in consideration of accelerating an increase in 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 6 kW at the higher side. Set and operate. The heating capability is not limited to a specific level among the capability levels having a plurality of stages, but may be the lowest capability or the intermediate heating capability level among the capability levels that the heat pump unit 1 has in a plurality of stages.

Further, in step 20, the primary side pump 41 and the secondary side pump 51 are started, and the primary side circulation circuit 40 circulates the hot water in the tank 3, and the secondary side circulation circuit 50 Circulates the heat medium.

Thus, in step 20, the heat quantity of the hot water boiled to the upper part in the tank 3 by the heating capacity of the heat pump unit 1 is circulated by the heat exchanger heat exchanger 4 in the primary side circulation circuit 40. Give to the heat medium from high temperature water. As a result, the heat medium outlet temperature detected by the secondary side heat exchanger outlet temperature thermistor 32 increases in temperature. The heat amount of the hot water supplied to the heat medium is radiated to the heating device 5 by the heat medium circulating the secondary circulation circuit 50, so that the heating capacity of the heating device 5 is improved.

In this way, when the heat quantity supply to the heat medium by the heat pump unit 1 is performed, ΔT which is a difference between the heat medium target outlet temperature and the heat medium outlet temperature detected by the secondary side heat exchanger outlet temperature thermistor 32 in step 40 is predetermined. It is determined whether the state of 5 degrees C or more which is an example of a 1st predetermined temperature continues for more than 1st predetermined time. If it is determined "Yes" in step 30, there is an opening between the heat medium target outlet temperature and the heat medium outlet temperature, and it is necessary to reinforce the heat supply so that the heating device 5 can quickly reach the required heating capacity. For this reason, the 1st control apparatus 100 raises the heating capability of the heat pump unit 1 to a higher level in step 32, and increases an output. For example, in step 32 the heating capacity of the heat pump unit 1, which was 4. 5 kW, is increased to 6 kW.

After the start of heating and the start of operation of the heat pump unit 1, in a situation where the time has not elapsed, it is not possible to increase the level of the capability in step 32 at a level where the heat capacity of the heat pump unit 1 is high. have. In this case, a process for maintaining the heating capability level is performed in step 32. After performing the process of reducing the heating capacity in step 42 described later, if there is no change in the situation such as heating, the heating capacity is not increased. However, if there is a change in the situation, the process returns from step 50 to step 30. A determination of "Yes" is made and the heating capacity is increased in step 32. This situation change means that after the start of operation of the heat pump unit 1, when the heat radiation amount in the heating device 5 increases due to an increase in the system of the heating device (increase in the number of devices) or a high heating set temperature, or the like, or This is the case where the outside temperature is reduced. In such a situation, a determination of "Yes" is made in step 30, and the process of step 32 is carried out.

In addition, the auxiliary heat source device 6 is operated in step 34, and the heat medium heated by the heat radiating heat exchanger 4 is reheated by the heating part 62. For example, the operation of the auxiliary heat source device 6 is executed by the second control device 200 which has received a command from the first control device 100. The reheating of the heat medium by the auxiliary heat source device 6 further strengthens the heat supply to the heating device 5, and the heating device 5 can reach the heating capacity more quickly. If it is determined in step 50 whether or not there is an operation stop request of the heating appliance 5, and it is determined that there is an operation stop request, the flowchart ends. If there is no operation stop request, the flow returns to step 30 and again? T Determine the state of.

If NO is determined in step 30, then in step 40 it is determined whether or not a state in which ΔT is less than 1 ° C, which is an example of the second predetermined temperature, continues for more than a second predetermined time. If it is determined in step 40 that the temperature difference between the heat medium target outlet temperature and the heat medium outlet temperature is small, and the heating capability of this state is maintained, the heat medium temperature is likely to exceed the heat medium target temperature in a short time. The first control device 100 thus lowers the heating capacity of the heat pump unit 1 to a lower level in step 42 to reduce the output. 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 approached to the heat medium target outlet temperature, and the amount of heat supplied by the heat pump unit 1 can be suppressed below the amount of heat required by the heating device. Therefore, even when the heat quantity shortage of the heating apparatus 5 which suppresses the oscillation stop phenomenon of the heat pump apparatus which is a subject arises, this insufficient heat amount can be suppressed small.

In addition, operation of the auxiliary heat source device 6 is stopped in step 44, and the amount of heat given to the heating device 5 is made smaller. By the operation stop of this auxiliary heat source apparatus 6, the suppression effect of the heat supply to the heating apparatus 5 can be strengthened further. If it is determined in step 50 whether there is an operation stop request of the heating appliance 5, and it is determined that there is an operation stop request, the flowchart ends. If there is no operation stop request, the flow returns to step 50 and again? T Determine the state of.

When it is determined "NO" in step 40, it is judged that it is premature to reduce the heating capability of the heat pump unit 1 to the temperature difference of a heat medium target outlet temperature and a heat medium outlet temperature being 1 degreeC or more and less than 5 degreeC, Proceed to step 50. In step 50, it is determined whether there is an operation stop request of the heating appliance 5, and when it is determined that there is an operation stop request, the present flowchart ends, and when there is no operation stop request, the flow returns to step 30 and again the? T Determine the state.

Below, the effect by the hybrid type hot water supply apparatus of 1st Embodiment is demonstrated. According to the hybrid hot water supply device, the first control device 100 is configured such that the difference between the heat medium target outlet temperature of the heat dissipation heat exchanger 4 and the heat medium outlet temperature of the heat dissipation heat exchanger 4 continues for the first predetermined time or more. When it is 5 degreeC or more which is an example of predetermined | prescribed temperature, the heating capability of the heat pump unit 1 is raised to the capability value of an upper stage (step 32). The first control device 100 is a heat pump unit when the difference between the heat medium target outlet temperature and the heat medium outlet temperature is less than 1 ° C. which is an example of the second predetermined temperature set to a value smaller than the first predetermined temperature for more than a second predetermined time. The heating capacity of (1) is lowered to the lower capacity value (step 42).

According to this control, when the detected heat medium outlet temperature is somewhat low with respect to the heat medium target temperature, and the heat radiation heat quantity of the heat medium to the heating apparatus 5 is insufficient, the heating capacity of the heat pump unit 1 is set to the upper limit value value. (For example, 4.5 kW to 6 kW), the required amount of heat to be given to the heating device 5 is quickly secured. Moreover, when the detected heat medium outlet temperature approaches the range below the 2nd predetermined temperature (for example, 1 degreeC) with respect to a heat medium target temperature, the heating capacity of the heat pump unit 1 will be set as a lower capability value. It lowers (for example, 6 kW-> 4.5 kW), and controls so that the heat supply of heat to the heating apparatus 5 by the heat pump unit 1 may be equal to or slightly below the said required heat quantity of the heating apparatus 5.

As a result, since the heat storage amount of the tank 3 is immediately filled when the heat is radiated to the heating device 5, it is possible to reduce complicated control using, for example, the inlet temperature, the outlet temperature, and the flow rate measurement of the heat exchanger. Without requiring a measuring device such as sensors or the like, frequent switching between the operation and stop of the heat pump unit 1 can be avoided. Therefore, according to the hybrid type hot water supply device of the present embodiment, the decrease in the coefficient of performance (COP) of the heat pump cycle can be suppressed by the study of the small temperature detection and control, and furthermore, the heat pump unit 1 The fall of a lifetime and durability can also be suppressed.

In particular, in the case of a hybrid hot water supply device having a supplemental heat source device in addition to the heat pump device as the heating means, the problem of the start-up stop of the heat pump device becomes more remarkable since the tank capacity is relatively small. Therefore, the said effect brought about by the hybrid type hot water supply apparatus of this embodiment becomes large.

For example, in the control described in the conventional patent document 1, since the measurement of the amount of water flowing through the heat exchanger is necessary, the flow rate estimation from a measuring device such as a flow sensor or the pump rotation speed is required. The flow rate sensor and the like are accompanied by an increase in the cost of the apparatus, and the flow rate estimation also needs to be calculated in consideration of the pressure loss of the pipe, and it cannot be said that the accuracy of the flow rate estimation can be guaranteed. Therefore, according to the hybrid type hot water supply device of the present embodiment, such a problem can be solved and the start of the start of the heat pump device can be avoided.

In addition, in the first control device 100 or the second control device 200, the difference? T between the heat medium target outlet temperature and the detected heat medium outlet temperature of the heat radiating heat exchanger 4 is maintained for a first predetermined time or more. In the case of 1 predetermined temperature (for example, 5 degreeC) or more, the heat medium by the auxiliary heat source device 6 is again heated (step 44). In addition, the second predetermined temperature (for example, the difference? T between the heat medium target outlet temperature and the detected heat medium outlet temperature of the heat dissipation heat exchanger 4 is set to a value smaller than the first predetermined temperature for more than a second predetermined time (for example, Less than 1 ° C.), the 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 somewhat low with respect to the heat medium target temperature and the heat radiation heat quantity of the heat medium to the heating apparatus 5 is insufficient, the heating capacity of the heat pump unit 1 is increased (for example, , 4kW → 6kW), so that the heat supply of the auxiliary heat source device 6 is compensated for by the heating of the auxiliary heat source device 6, so that the heating device 5 can be quickly provided with the required heat amount. Moreover, when the detected heat medium outlet temperature approaches the range below the 2nd predetermined temperature (for example, 1 degreeC) with respect to a heat medium target temperature, the heat-heating capability of the heat pump unit 1 may be reduced (for example, , The heating of the auxiliary heat source device 6 is stopped in addition to 6 kW → 4.5 kW), so that the amount of heat given to the heating device 5 can be drastically lowered, so that the amount of heat insufficient for the required heat amount of the heating device 5 is reduced. The control which can suppress this can be implemented.

(Other Embodiments)

As mentioned above, although preferred embodiment of this invention was described, this invention can be variously modified and implemented in the range which does not deviate from the main meaning of this invention, without restricting at all to said embodiment.

In addition, in the above-described embodiment, the hybrid type hot water supply device is a predetermined memory stored in the first control device 100 when performing the operation based on the results of past use calories in the boiling operation using the late night power in the late night time zone. The driving performance of the period (for example, one week) is stored in advance at the time of factory shipment of the predetermined driving information (model driving information), and this initial value is updated whenever the usage history of the hot water supply device is added. It may be adapted to the use situation of a user by going around.

The working refrigerant flowing through the heat pump cycle of the heat pump unit 1 is not limited to carbon dioxide, but may be another refrigerant such as prone.

Claims (2)

A tank (3) for storing the heat storage fluid used for the hot water supply and the heat dissipation in the heat dissipation device (5),
A heat pump device (1) in which a heating capacity for heating the heat storage fluid in the tank is adjusted to a plurality of levels;
A heat dissipation heat exchanger (4) for heating the heat medium by heat-exchanging the heat medium supplied to the heat dissipation device and the heat storage fluid in the tank;
Heat medium outlet temperature detection means (32) for detecting the heat medium outlet temperature of the heat medium after being heated by said heat radiating heat exchanger;
An auxiliary heat source device 6 for heating the heat medium before flowing into the heat dissipating device after the heat dissipating heat exchanger flows out;
It is provided with the control apparatus 100 which controls the heating operation by the heat exchange in the said heat exchanger, while controlling the said heating capability of the said heat pump apparatus,
The control device includes:
When the difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger is equal to or greater than the first predetermined time which continues for more than a first predetermined time, the heating of the heat pump apparatus is performed. Raises the ability to the upper level,
The difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger is less than the second predetermined temperature set to a value smaller than the first predetermined temperature for more than a second predetermined time. To lower the heating capacity of the heat pump apparatus to the lower capacity value
Hybrid hot water supply device.
The method of claim 1,
The control device (100, 200),
If the difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger is equal to or greater than the first predetermined temperature continuously for more than a first predetermined time, it is determined by the auxiliary heat source device. Heating of the heat medium,
The difference between the heat medium target outlet temperature of the heat dissipation heat exchanger and the detected heat medium heat outlet temperature of the heat dissipation heat exchanger is less than the second predetermined temperature set to a value smaller than the first predetermined temperature for more than a second predetermined time. To stop heating of the heat medium by the auxiliary heat source device.
Hybrid hot water supply device.

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