JP5491878B2 - Hot water storage hot water supply system using solar heat - Google Patents

Description

  The present invention relates to a hot water storage hot water supply system that uses solar heat to heat tank hot water stored in a hot water storage tank using solar heat.

  A hot water storage hot water supply system using solar heat is provided with a heat medium circulation path for circulating a heat medium between a solar heat collector and a hot water storage tank, and a part of the heat medium circulation path is disposed in the hot water storage tank. The water supplied to the tank is heated with a heat medium to store hot water, and the tank hot water in the hot water storage tank is reheated with an auxiliary heat source device such as a water heater as needed (Patent Document 1). The above-mentioned hot water storage hot water supply system further detects the amount of heat input to the hot water storage tank, the incoming water temperature, and the outgoing water temperature from the hot water storage tank in order to know how much heat was saved by solar heat. Based on these detection results, the inflow heat amount and the outflow heat amount are calculated, and the saved heat amount is calculated by subtracting the inflow heat amount from the outflow heat amount.

JP 2002-147870 A JP 2006-322650 A

  By the way, in the hot water storage type hot water supply system, if the tank hot water is not used for a long period of time, there is a concern that harmful bacteria such as Legionella bacteria may propagate in the hot water storage tank. Further, it is desired to periodically inspect the circulation state of the heat medium in the heat medium circulation path and to prevent the heat medium from freezing in the heat medium circulation path. Therefore, it is necessary to perform a heat medium heating operation that heats the heat medium in the heat medium circuit other than during hot water storage operation or hot water supply operation, but hot water is stored in a hot water storage tank using exhaust heat from a power generation gas engine or the like. Unlike a cogeneration system that uses hot water from a tank, in a hot water storage system using solar heat, the amount of solar heat collected depends on the amount of solar radiation. In some cases, the heating medium heating operation cannot be performed by the vessel.

  On the other hand, in the hot water storage hot water supply system using the solar heat having the auxiliary heat source device as described above, hot water having an arbitrary temperature can be generated by the auxiliary heat source device, so that hot water is provided between the auxiliary heat source device and the heat medium circulation path. When a reheating operation as described above is required, the auxiliary heat source unit is operated to generate hot water and circulate this hot water through the hot water circulation path. The heating medium in the heating medium circulation path can be heated by a heating source other than the heat collector.

  However, if the reheating operation is performed using the auxiliary heat source unit to heat the heat medium in the heat medium circulation path, the tank hot water in the hot water storage tank is also heated during the reheating operation. By simply subtracting the amount of inflow heat, the error in the amount of heat saved increases.

  The present invention is made in view of the above circumstances, and even if the tank hot water in the hot water storage tank is heated using energy other than solar heat, the amount of solar heat consumed by heating by solar heat is calculated, and the amount of saved heat is calculated. It is an object of the present invention to provide a hot water storage hot water supply system using solar heat that can reduce an error in performing.

The hot water storage hot water supply system using solar heat according to the present invention,
A solar collector that collects solar heat, a hot water storage tank that stores hot water,
A heat dissipation circuit that forms a heat medium circulation path between the solar heat collector and the hot water storage tank, and heats the hot water in the hot water storage tank with a circulating heat medium by arranging a part of the circulation path in the hot water storage tank. A heat medium circuit comprising:
A feed water temperature detector for detecting a feed water temperature supplied to the hot water storage tank;
A tapping temperature detector for detecting tapping temperature of hot water flowing through a hot water supply path connected to the outlet of the hot water storage tank;
A hot water flow rate detector for detecting the hot water flow rate of hot water flowing through the hot water path connected to the outlet of the hot water storage tank;
A hot water circulation path in which hot water for heat exchange heating of the heat medium circulating in the heat medium circulation path circulates;
An auxiliary heat source machine for heating the hot water circulating in the hot water circuit,
Based on the detected hot water temperature, hot water temperature, and hot water flow rate, the hot water supply heat quantity is calculated, and the hot water circulating through the hot water circulation path is heated by the auxiliary heat source machine to calculate the auxiliary heat source heat quantity consumed. A control means for calculating the amount of solar heat used for hot water supply by subtracting the auxiliary heat source heat amount corresponding to the amount of hot water supply from the amount of heat;
And a display unit that displays the amount of solar heat calculated by the control means.

  With such a configuration, the hot water circulating through the hot water circulation path is reheated by using the auxiliary heat source unit to sterilize the hot water storage tank, prevent the heat medium circulation path from freezing, and perform periodic inspection of the heat medium circulation state. Calculate the amount of solar heat by heating the tank hot water with solar heat by excluding the amount of auxiliary heat source corresponding to the amount of hot water used corresponding to the amount of heat supplied from the auxiliary heat source consumed by the auxiliary heat source. Therefore, an error in the amount of saved heat can be reduced.

  Furthermore, in order to calculate the amount of auxiliary heat source heat, a tank temperature detector that detects the temperature of the tank hot water in the hot water storage tank is provided, and the control means is a heat medium that circulates in the heat medium circulation path using the hot water circulating in the hot water circulation path The difference in temperature between the detected temperature of the hot water in the hot water storage tank at the start of heating of the heat medium and the detected temperature of the hot water in the hot water tank at the end of the heating of the heat medium, and the hot water storage It is preferable that the auxiliary heat source heat amount be calculated based on the amount of hot water stored in the tank.

  With such a configuration, when the hot water heated by the auxiliary heat source device is circulated through the hot water circulation path when the hot water supply is stopped and the reheating operation is performed, the temperature of the tank hot water in the hot water storage tank is detected by the tank temperature detector. The auxiliary heat source heat quantity can be easily calculated based on the temperature difference between the detected temperature at the start of reheating and the detected temperature at the end of reheating, and the amount of hot water stored in the hot water storage tank (tank capacity).

  Further, in order to calculate the amount of heat of the auxiliary heat source, a heat medium temperature detector for detecting the temperature of the heat medium in the heat medium circuit is provided, and the control means circulates the heat medium circuit by the hot water circulating in the hot water circuit. When heat exchange heating of the heat medium is performed, the auxiliary heat source heat amount is calculated based on the temperature of the heat medium detected every predetermined time and the flow rate of the heat medium flowing through the heat medium circulation path within the predetermined time. A configuration is preferable.

  With such a configuration, not only when the hot water heated by the auxiliary heat source device is circulated through the hot water circulation path when the hot water supply is stopped, but also when the reheating operation is performed, the hot water circulation path and the heat medium circulation path are prevented from being frozen during hot water supply. Even if a reheating operation is performed to perform a periodic inspection to improve the operating state of a thermal valve or the like, the temperature of the heat medium detected every predetermined time and the heat within the predetermined time The amount of heat saved can be calculated by calculating the auxiliary heat source heat amount based on the flow rate of the heat medium flowing through the medium circulation path. In this case, the calculation of the amount of heat of the auxiliary heat source can be obtained by multiplying the temperature difference before and after every predetermined time of the heat medium flowing through the predetermined portion of the heat medium circuit by the flow rate flowing within the predetermined time. It can also be obtained by multiplying the temperature difference between the upstream side and the downstream side of the heat radiating section in the medium circulation path by the flow rate flowing within a predetermined time.

  When obtaining the temperature difference between the upstream side and the downstream side of the heat dissipating part in the heat medium circuit, the heat medium temperature detector detects the temperature of the heat medium upstream of the heat dissipating part in the heat medium circuit. A heat medium temperature detector and a second heat medium temperature detector for detecting the temperature of the heat medium downstream of the heat radiating unit, and the control means is a predetermined unit between the downstream side and the upstream side of the heat radiating unit in the heat medium circuit. The auxiliary heat source heat quantity is calculated on the basis of the temperature difference for each time and the flow rate of the heat medium flowing through the heat medium circulation path within the predetermined time.

  With such a configuration, the heat medium circulation path is assisted based on the temperature difference for each predetermined time between the downstream side and the upstream side of the heat radiating section and the flow rate of the heat medium that has flowed through the heat medium circulation path within the predetermined time. Since the heat source heat amount is calculated every predetermined time, the solar heat amount excluding the auxiliary heat source heat amount can be displayed on the display unit in real time even if the reheating operation is performed during hot water supply.

The control means preferably has a configuration in which the carbon dioxide reduction amount is calculated based on the calculated solar heat amount and the carbon dioxide conversion coefficient, and the carbon dioxide reduction amount is displayed on the display unit.
With such a configuration, not only the amount of solar heat but also the amount of carbon dioxide reduction can be displayed on the display unit, so the user can be informed of the degree of contribution of solar heat.

  As described above, according to the hot water storage hot water supply system using solar heat according to the present invention, the hot water circulating in the hot water circulation path is heated by the auxiliary heat source unit to heat the tank hot water in the hot water storage tank. By excluding the auxiliary heat source heat amount corresponding to the amount of hot water used in the auxiliary heat source heat consumed by the use of the auxiliary heat source device from the hot water supply amount, it is possible to calculate the solar heat amount by heating the tank hot water with solar heat. It is possible to reduce an error in obtaining.

It is a schematic diagram which shows the whole structure of the hot water storage type hot-water supply system using solar heat in embodiment. It is explanatory drawing which shows the display state of the display part provided in the remote control of the hot water storage type hot-water supply system using solar heat in embodiment. It is a flowchart which shows the control which calculates the auxiliary | assistant heat source calorie | heat amount (gas calorie | heat amount) at the time of performing reheating operation at the time of the hot water supply stop of the hot water storage type hot-water supply system in embodiment. It is a flowchart which shows the control which calculates the amount of solar heat when the reheating operation is performed at the time of the hot water supply stop of the hot water storage type hot water supply system in the embodiment. It is a flowchart which shows the control which calculates the auxiliary | assistant heat source calorie | heat amount (gas calorie | heat amount) and solar calorie | heat amount when the reheating operation is performed at the time of the hot water supply stop of the hot water storage hot water supply system using solar heat in embodiment or during hot water supply operation.

Hereinafter, a hot water storage hot water supply system using solar heat according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a hot water storage hot water supply system 1 using solar heat according to this embodiment includes a hot water storage tank 2 for storing hot water, a solar heat collector 9 for collecting solar heat, a solar heat collector 9 and a hot water storage tank. 2, a heat medium circulation path 7 that forms a heat medium (for example, antifreeze) circulation path, a circulation pump 31 that circulates the heat medium in the heat medium circulation path 7, and hot water discharged from the hot water storage tank 2 Auxiliary heat source unit 4 such as a hot water heater that heats hot water in the path 6 as necessary and uses hot water supply, or heats hot water circulating in a hot water circulation path 41 to be described later and uses it for heating and heat sterilization operation; Is provided.

  The hot water storage tank 2 is a metal (for example, stainless steel) tank excellent in corrosion resistance, and a heat insulating material (not shown) is disposed on the outer peripheral portion to keep hot hot water in the tank for a long time. The hot water storage tank 2 has a vertically long shape, and an introduction port 21 to which a water supply pipe 5 for introducing tap water is connected is provided at the bottom thereof. The water supply pipe 5 includes a water supply source valve 51, a water filter 52, a pressure reducing valve 53, a water supply temperature detector 54 for detecting the temperature of water supplied to the hot water storage tank 2, a check valve 55, and a water supply pipe. A drain valve 56 is provided.

  In the upper part of the hot water storage tank 2, a discharge port 22 for discharging hot water from the tank is provided, and the hot water supply path 6 is connected to the discharge port 22. Furthermore, tank temperature detectors 23 for detecting the temperature of the tank hot water in the hot water storage tank 2 are attached to the upper and lower four locations on the wall surface of the hot water storage tank 2.

  A discharge pipe 63 provided with a pressure relief valve 62 is connected in the middle of the hot water supply path 6. Further, a tank hot water temperature detector 64 for detecting the temperature of the hot water in the hot water discharged from the hot water storage tank 2 is provided on the upstream side of the hot water supply path 6 connected to the discharge pipe 63. Further, a normally closed solar electromagnetic valve 65 is provided on the downstream side of the hot water supply passage 6 with respect to the connection portion with the discharge pipe 63.

  One end of a water supply branch pipe 57 branched from the water supply pipe 5 is connected to the downstream side of the solar solenoid valve 65 in the hot water supply path 6, and the other end of the water supply branch pipe 57 is a water supply temperature detector of the water supply pipe 5. It is connected to the downstream side of 54. The water supply branch pipe 57 is provided with a check valve 58. A mixing valve 66 that mixes the tank hot water discharged from the hot water storage tank 2 and tap water is provided at a connection portion of the hot water supply path 6 to the water supply branch pipe 57. The mixing valve 66 is configured to adjust the amount of mixing of the tank hot water and tap water under the control of the control device 10 to be described later. In the mixing valve 66, the tank hot water and the tap water from the water supply branch pipe 57 are mixed with each other. By mixing at a ratio, the tank hot water is adjusted to a set hot water supply temperature.

  On the downstream side of the mixing valve 66 in the hot water supply path 6, a water amount sensor 67 for detecting the flow rate of the mixed hot water after mixing of the tank hot water and tap water, a mixing temperature detector 68 for detecting the temperature of the mixed hot water, and a high cut thermistor 69. Is provided. As the water amount sensor 67, for example, an impeller-type water amount sensor is used, and the flow rate is detected by water amount information obtained by converting the rotation speed of the impeller rotating by the water flow into a pulse signal. Further, the information on the temperature of the mixed hot water (the tapping temperature of the present invention) detected by the mixing temperature detector 68 and the water amount information of the water amount sensor 67 are output to the controller 10 that is electrically connected.

  Auxiliary heat source device 4 composed of a gas water heater is connected to the hot water supply path 6 downstream of the high-cut thermistor 69. The auxiliary heat source unit 4 is formed separately from the hot water supply heating unit 4a for heating the mixed hot water supplied from the hot water supply passage 6 therein by the hot water supply gas burner 401a in the hot water supply heat exchanger 40a, and the hot water supply passage 6. There is provided a reheating heating unit 4b that heats warm water circulating in the warm water circulation path 41 (including warm water mixed with antifreeze liquid) by the reheating gas burner 401b in the reheating heat exchanger 40b.

  Hot water in the hot water circulation path 41 is circulated by driving a circulation pump 47 provided in the auxiliary heat source unit 4. The hot water circulation path 41 is connected to the heating circulation path 41 a connected to the heater 44 and the liquid heat exchanger 8 for heating the heat medium flowing through the heat medium circulation path 7 outside the auxiliary heat source unit 4. The reheating circulation path 41b is branched and joined again to return to the reheating heating unit 4b in the auxiliary heat source unit 4. A normally closed thermal valve 45 is provided in the heating circulation path 41a, and a normally closed thermal valve 46 is provided upstream of the liquid heat exchanger 8 in the reheating circulation path 41b.

Furthermore, a controller 42 is disposed inside the auxiliary heat source unit 4, and this controller 42 transmits and receives various signals to and from a remote controller 43 installed in a kitchen or the like. The remote controller 43 includes various switches such as an operation button and a hot water supply temperature setting button, and a display unit 43a that displays a hot water supply set temperature, a solar heat amount, a CO ₂ cumulative reduction amount, and the like as shown in FIG.

  When the hot water stored in the hot water storage tank 2 is not sufficiently heated by solar heat to reach the hot water supply set temperature, the hot water supplied from the hot water supply passage 6 is supplied to the hot water supply heating unit 4a of the auxiliary heat source unit 4 as hot water supply. After heating to the set temperature, the hot water is discharged from the hot water outlet 61. On the other hand, when the tank hot water is heated to the hot water supply set temperature or higher by the solar heat, the tap water is mixed by the mixing valve 66 and adjusted to the hot water set temperature, and the hot water supply heating unit 4a of the auxiliary heat source unit 4 is used. The hot water is discharged from the hot water outlet 61 without heating.

  The solar heat collector 9 is in the form of a panel that is placed vertically on the veranda of an apartment house or installed on the roof of a building, and a heat medium flow path that is heated by solar radiation is formed inside. . This flow path constitutes a part of the heat medium circulation path 7. Furthermore, the solar heat collector 9 includes a solar power generation unit 91 in which a solar cell that performs solar power generation is installed. The solar power generation unit 91 is electrically connected to the control device 10.

  A part of the heat medium circulation path 7 disposed in the hot water storage tank 2 constitutes a heat radiating section 70 in which heat is exchanged between the hot water in the hot water storage tank 2 and the heat medium. The heat radiating portion 70 is formed of a pipe that is bent in a U shape or the like below the hot water storage tank 2.

  Since the hot water storage tank 2 has an introduction port 21 through which tap water is introduced at the bottom, the heat radiating unit 70 is disposed in the lower part of the hot water storage tank 2 so as to heat normal temperature tap water. Yes. With such a configuration, the water supplied to the hot water storage tank 2 in the heat radiating section 70 is heated by the heat medium, and the entire hot water in the hot water storage tank 2 is heated from below to above by convection.

  The heat medium circulation path 7 includes a circulation forward path 71 through which the heat medium flows from the solar heat collector 9 to the heat radiating section 70, a circulation return path 72 through which the heat medium flows from the heat radiation section 70 to the solar heat collector 9, and these circulation forward paths. 71 and a bypass path 73 that allows the circulation return path 72 to communicate with each other.

  A circulation pump 31 that pumps the heat medium is provided in the circulation return path 72 of the heat medium circulation path 7. By driving the circulation pump 31, the heat medium heated by the solar heat collector 9 is sent to the heat radiating section 70 via the circulation forward path 71, and the heat medium after heat exchange in the heat radiating section 70 passes through the circulation return path 72. To the solar heat collector 9. The circulation pump 31 is normally driven by the power generated by the solar power generation section 91 of the solar heat collector 9 and performs reheating operation such as sterilization when solar power generation cannot be performed. In this case, it is driven by a commercial power supply via the control device 10.

  Further, a cistern 32 is provided between the heat radiating section 70 and the circulation pump 31 in the circulation return path 72. The cistern 32 includes a first water level sensor 33 that detects an abnormally high water level of the heat medium, A second water level sensor 34 for detecting an abnormally low water level of the medium and a water level switch 35 for preventing idling of the circulation pump 31 are provided. The detection results of the first and second water level sensors 33 and 34 are output to the control device 10.

  Further, an upstream side heat medium temperature detector 74 a (first heat medium temperature detector) for detecting the temperature of the heat medium is provided between the connection part of the bypass path 73 and the heat radiating part 70 in the circulation forward path 71, and the circulation return path 72. A downstream heat medium temperature detector 74 b (second heat medium temperature detector) for detecting the temperature of the heat medium is provided between the connection portion of the bypass path 73 and the circulation pump 31. The temperature detection results of the heat medium detected by the upstream heat medium temperature detector 74a and the downstream heat medium temperature detector 74b are output to the electrically connected control device 10.

  Further, a liquid heat exchanger 8 is formed in the bypass path 73. The liquid heat exchanger 8 heats the heat medium flowing through the heat medium circulation path 7 with hot water flowing through the reheating circulation path 41b by bringing a part of the reheating circulation path 41b into contact with or adjacent to the bypass path 73. Heat by exchange. The specific configuration of the liquid-liquid heat exchanging unit 8 is, for example, a double-pipe structure in which a pipe constituting the reheating circulation path 41b is provided so as to cover the circumference of the pipe constituting the bypass path 73, and a partition is separated. For example, the heat medium can be circulated by connecting the bypass path 73 to one chamber, and the hot water can be circulated by connecting the reheating circulation path 41b to the other chamber.

  In addition, a normally open heat valve 75 that communicates and blocks the flow of the heat medium to the solar heat collector 9 is provided on the downstream side of the circulation return path 72 connected to the bypass path 73. Further, the bypass path 73 is provided with a normally closed thermal valve 76 for communicating and blocking the flow of the heat medium from the circulation return path 72 to the circulation forward path 71. During the reheating operation, the normally open heat valve 75 is closed and the normally closed heat valve 76 is opened. At this time, the normally closed heat valve 46 provided in the reheating circuit 41b is Open the valve.

  The control device 10 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, and is detected from various detectors such as various temperature detectors and water level sensors. Based on the result information and the like, the devices such as the circulation pump 31, the auxiliary heat source unit 4, and various on-off valves are controlled. In addition, the information input with the remote control 43 is input into the control apparatus 10 via the controller 42 provided in the auxiliary heat source unit 4.

  Further, the control device 10 is also supplied with the power generated by the solar power generation unit 91 of the solar heat collector 9 and uses the power generated by the solar power generation unit 91 for the circulation pump 31 in accordance with the increase in voltage of the solar power generation unit 91. Switching control is performed between driving and using a commercial power source. And the control apparatus 10 is controlled to drive the circulation pump 31 using a commercial power source, regardless of the weather when starting the heat sterilization operation.

  And the reheating operation control of sterilizing the tank hot water in the hot water storage tank 2 regularly is performed by the control apparatus 10. First, the warm water circulating through the reheating circuit 41b is heated by the reheating heating unit 4b of the auxiliary heat source unit 4. Then, the heat medium flowing through the heat medium circulation path 7 is heat-exchanged and heated with hot water flowing through the reheating circuit 41b in the liquid heat exchanger 8, and the hot water in the hot water storage tank 2 is heat-exchanged with the heated heat medium. Heat. The tank hot water is heated until, for example, a temperature equal to or higher than a temperature necessary for sterilization (for example, 60 ° C.) continues for a predetermined time (for example, 15 minutes).

  By the way, in the hot water storage type hot water supply system using solar heat according to the present embodiment, since the heat collection by the solar heat collector 9 depends on the amount of solar radiation, the tank hot water in the hot water storage tank 2 is not always heated by solar heat. . Therefore, the hot water circulating through the reheating circuit 41b is heated using the auxiliary heat source device 4 which is a gas water heater, the heat medium in the heat medium circuit 7 is heated by heat exchange, and the hot water storage tank is further heated by the heat medium. Heat processing is performed by heating the tank hot water in 2 to a predetermined temperature. Thus, since the heat treatment of the tank hot water by the reheating operation uses the auxiliary heat source unit 4, by subtracting the total heat amount [kcal] of the auxiliary heat source consumed by using the auxiliary heat source unit 4 from the total amount of hot water supply [kcal], The error in calculating the amount of solar heat [kcal] consumed for hot water supply can be reduced.

  In the present embodiment, even if the reheating operation is performed, the controller 10 calculates the total amount of hot water supply [kcal] and the auxiliary heat source heat [kcal] to calculate the solar heat calorie [kcal]. 10 calculates the total hot water supply heat amount [kcal] based on the feed water temperature detected by the feed water temperature detector 54, the hot water temperature detected by the mixed temperature detector 68, and the hot water flow rate detected by the water amount sensor 67. To do. Then, the auxiliary heat source total heat amount (total gas heat amount) [kcal] consumed when the hot water circulating in the reheating circulation path 41b during the reheating operation is heated by the auxiliary heat source unit 4 is calculated. Then, by subtracting the auxiliary heat source total heat quantity [kcal] from the hot water supply total heat quantity [kcal], the solar heat heat quantity [kcal] consumed for hot water supply is calculated. The auxiliary heat source total heat quantity [kcal] is calculated based on, for example, the total heat quantity consumed by using the auxiliary heat source device 4 in the reheating operation described later.

Further, a carbon dioxide reduction amount [kg] is also calculated from the calculated solar heat calorie [kcal] and the carbon dioxide conversion coefficient.
First, the solar heat calorie [kcal] is converted into volume (m ³ ) by the formula of solar heat calorie [m ³ ] = solar heat calorie [kcal] / (volume conversion coefficient × caloric coefficient × temporary heat efficiency). The volume conversion coefficient is 10,750, the calorie coefficient is 0.966, and the temporary heat efficiency is 0.9.
Thereafter, the amount of carbon dioxide reduction [kg] is obtained by the equation of carbon dioxide reduction [kg] = solar heat quantity [m ³ ] × carbon dioxide conversion coefficient. The carbon dioxide conversion coefficient is 2.21 [kg / m ³ ].
Then, the calculated carbon dioxide reduction amount [kg] and solar heat quantity [kcal] are displayed on the display unit 43a.

[Calculation control of solar heat 1]
With reference to the flowchart of FIG. 3, calculation control of the total gas heat amount of the auxiliary heat source unit 4 when the reheating operation is performed in order to perform a heating process for sterilization when hot water supply is stopped will be specifically described.

  First, when the hot water supply operation control is started in the control device 10, it is determined whether or not the reheating operation is started (step S11). When the reheating operation is started (Yes in step S11), the solar electromagnetic valve 65 provided in the hot water supply path 6 is closed (step S12). Thereby, use of the tank hot water in the hot water storage tank 2 is prohibited.

  Next, the circulation pump 47 is driven in the auxiliary heat source unit 4 and the warm water in the warm water circulation path 41 is heated by the reheating heating unit 4b, and the thermal valve 46 provided in the reheating circulation path 41b is opened (step). S13). Thereby, the hot water heated by the reheating heating unit 4b of the auxiliary heat source unit 4 circulates in the reheating circulation path 41b. Further, the normally open heat valve 75 is closed in the heat medium circulation path 7 and the normally closed heat valve 76 is opened to drive the circulation pump 31 (step S14). The temperature of the hot water in the hot water storage tank 2 at the start of driving the circulation pump 31 is detected and stored in the memory in the control device 10 (step S15). As the tank hot water temperature, the temperature detected by the uppermost tank temperature detector 23 is stored.

  In the liquid heat exchanger 8, the heat medium flowing through the heat medium circulation path 7 is heat-exchanged and heated with hot water flowing through the reheating circuit 41b, and the heated heat medium does not flow toward the solar heat collector 9 side. Then, the hot water in the hot water storage tank 2 is heated. When the reheating operation is completed (Yes in step S16), the temperature of the tank hot water in the hot water storage tank 2 at the end of the reheating operation is detected and stored in the memory (step S17).

  Further, in the auxiliary heat source unit 4, the heat valve 46 of the reheating circulation path 41b is closed to heat the hot water in the hot water circulation path 41 by the reheating heating unit 4b and to circulate the hot water in the reheating circulation path 41b. The driving of the circulation pump 47 is stopped (step S18). In addition, the normally open heat valve 75 is opened in the heat medium circulation path 7 and the normally closed heat valve 76 is closed to stop the circulation pump 31 (step S19).

  Next, the gas heat quantity [kcal] that is the auxiliary heat source heat quantity consumed by the use of the auxiliary heat source device 4 during the reheating operation is calculated. The amount of gas heat [kcal] is the detected temperature of the hot water in the hot water storage tank 2 at the end of the reheating operation (at the end of reheating) and the hot water in the hot water tank 2 at the start of the reheating operation (at the start of reheating). The temperature difference from the detected temperature is calculated by multiplying the tank capacity (for example, 100 liters) (step S20). The calculated gas heat quantity [kcal] is stored in the memory of the control device 10.

  And the gas calorie | heat amount [kcal] calculated by step S20 is further integrated | accumulated to the gas total calorie | heat amount [kcal] consumed by the past reheating operation performed before performing this reheating operation after the end of the last hot water supply operation. The total gas heat quantity [kcal] is obtained (step S21), and the calculated total gas heat quantity [kcal] is stored in the memory of the control device 10.

Next, with reference to the flowchart of FIG. 4, calculation control of the solar heat amount and the carbon dioxide reduction amount of the tank hot water in the hot water storage tank 2 will be specifically described.
When the user opens the currant or the like at the hot water outlet 61, water is supplied from the water supply branch pipe 57 to the hot water supply path 6 through the mixing valve 66. When the water amount sensor 67 detects flowing water of a predetermined flow rate or more, it is determined that the hot water supply operation has started (Yes in step S31), the solar electromagnetic valve 65 provided in the hot water supply passage 6 is opened, and the hot water storage tank 2 is opened. Hot water is supplied (step S32).

  Then, a temperature difference between the hot water temperature detected by the mixed temperature detector 68 and the feed water temperature detected by the feed water temperature detector 54 is calculated every second, and the hot water flow rate detected by the water amount sensor 67 is calculated based on this temperature difference. Multiply [liter / min / 60] to calculate the hot water supply heat [kcal / sec] and store it in the memory (step S33).

  The temperature difference between the hot water temperature and the feed water temperature is determined as follows. First, the time until the water at which the feed water temperature is detected reaches the position for detecting the tapping temperature is calculated based on the flow rate detected by the flow sensor 67, and detected after the detected feed water temperature and the calculated time have elapsed. Find the temperature difference based on the tapping temperature.

  Further, the hot water supply heat quantity [kcal / second] calculated in step S33 is integrated to obtain the total hot water supply heat quantity [kcal] and stored in the memory (step S34). The solar heat calorific value [kcal] is calculated by subtracting the hot water flow rate used in the hot water supply operation with respect to the tank capacity in the gas total calorific value [kcal] stored in the memory from the calculated hot water hot water calorie [kcal] ( Step S35). The calculated amount of solar heat [kcal] is displayed on the display unit 43a of the remote controller 43 as shown in FIG. 2 (step S36). In the state where only the reheating operation is performed without hot water supply, 0 [kcal] is displayed as the amount of solar heat.

  Then, a carbon dioxide reduction amount [kg] is calculated from the calculated solar heat quantity [kcal] and the carbon dioxide conversion coefficient (step S37), and the carbon dioxide reduction amount [kg] is displayed on the display unit 43a (step S38). . If the hot water supply operation is performed again during the hot water supply operation control, the process returns to step S31 and steps S32 to S38 are performed. If the hot water supply is stopped and the reheating operation is performed, the process starts from step S11 of FIG. Step S21 is performed.

  Thus, in this embodiment, when hot water circulating through the reheating circuit 41b is heated using the auxiliary heat source unit 4 when hot water supply is stopped and the reheating operation is performed, the tank hot water in the hot water storage tank 2 is used. Simply find the temperature difference between the detected temperature at the start of reheating and the detected temperature at the end of reheating, and multiply this temperature difference by the tank capacity that is the amount of hot water stored in the hot water storage tank 2 to assist The amount of gas heat [kcal] consumed by using the heat source unit 4 can be calculated.

  Then, by excluding the hot water supply flow rate used in the hot water supply operation for the tank capacity in the gas total heat quantity [kcal] stored in the memory from the hot water supply total heat quantity [kcal], solar heat when the tank hot water is heated by solar heat Since calorie | heat amount [kcal] can be calculated, even if it performs reheating operation using the auxiliary heat source apparatus 4 at the time of a hot water supply stop, it can grasp | ascertain the energy-saving amount except the calorie | heat amount consumed at this reheating operation.

  At the time of heat treatment such as sterilization performed when hot water supply is stopped, the reheating operation is performed with the solar solenoid valve 65 closed, so that only the temperature difference in the tank hot water during the reheating operation is detected. Thus, the total gas heat [kcal] consumed by using the auxiliary heat source device 4 can be calculated.

[Calculation control of solar heat 2]
In the calorific value calculation control based on the flowcharts of FIG. 3 and FIG. 4, the solar heat calorie is calculated by subtracting the consumed gas total calorific value obtained from the temperature difference of the tank hot water in the hot water storage tank 2 during the reheating operation from the total hot water supply calorie. However, the solar heat calorie may be calculated by subtracting the consumed gas calorific value obtained from the temperature difference of the heat medium in the heat medium circulation path 7 during the reheating operation from the total hot water supply calorie.

  For example, in a reheating operation performed to prevent freezing or to check the circulation state of the heat medium, a hot water supply operation may be performed at the same time, so that water is supplied into the hot water storage tank 2 along with the hot water supply. The temperature of the tank hot water in 2 falls. Therefore, the amount of heat consumed by the auxiliary heat source unit 4 cannot be accurately calculated only by detecting the temperature difference of the tank hot water in the hot water storage tank 2 before and after the reheating operation. In such a case, the following calorific value calculation control can be used.

  Referring to the flowchart of FIG. 5, calculation control of the amount of solar heat and carbon dioxide reduction when performing reheating operation not only for sterilization but also for freezing prevention and periodic inspection of the heat medium circulation state in the heat medium circulation path 7. Will be described.

First, it is determined whether or not the reheating operation has been started (step S41). In addition, when reheating operation is performed for freeze prevention or periodic inspection, it is possible to perform hot water supply operation at the same time. Therefore, it is not necessary to close the solar solenoid valve 65.
Next, the circulation pump 47 is driven in the auxiliary heat source unit 4 and the warm water in the warm water circulation path 41 is heated by the reheating heating unit 4b, and the thermal valve 46 provided in the reheating circulation path 41b is opened (step). S42). Further, the normally open heat valve 75 is closed in the heat medium circulation path 7 and the normally closed heat valve 76 is opened to drive the circulation pump 31 (step S43). When the driving of the circulation pump 31 is started, the temperature of the heat medium detected by the upstream heat medium temperature detector 74a and the temperature of the heat medium detected by the downstream heat medium temperature detector 74b are detected every second from the start. Are stored in a memory in the control device 10.

  Next, the gas heat quantity [kcal / second], which is the auxiliary heat source heat quantity consumed by using the auxiliary heat source device 4 during the reheating operation, is calculated. The amount of gas heat [kcal / second] is determined based on the heat medium temperature detected by the upstream heat medium temperature detector 74a and the downstream heat medium temperature detector 74b provided in the heat medium circulation path 7, and on the upstream side of the heat radiating unit 70. The temperature difference from the downstream side is calculated every second, and the gas heat quantity [kcal / second] is calculated by multiplying the flow rate [liter / minute / 60] of the heat medium flowing through the heat medium circulation path 7 per second. (Step S44). The calculated gas heat quantity [kcal / second] is stored in the memory of the control device 10.

Note that the temperature difference between the upstream side and the downstream side of the heat radiating unit 70 is obtained as follows. First, the time until the heat medium whose temperature is detected on the upstream side reaches the position for detecting the temperature on the downstream side is calculated based on the flow rate of the circulation pump 31, and the detected temperature on the upstream side and the calculated time passage The temperature difference is obtained from the downstream detected temperature detected later.
Further, the gas calorific value [kcal / sec] calculated in step S44 is integrated to obtain the total gas calorific value [kcal] and stored in the memory (step S45).

  Next, it is determined whether or not the hot water supply operation is being performed (step S46). If the hot water supply is stopped (No in step S46), it is determined whether or not the reheating operation is being continued (step S46). S47) If the process is continued (No in step S47), the process returns to step S44 to calculate the amount of gas heat [kcal / sec]. When the reheating operation is completed (Yes in step S47), the heat valve 46 of the reheating circuit 41b is closed in the auxiliary heat source unit 4, and the hot water in the hot water circuit 41 is heated by the reheating heating unit 4b. Then, the driving of the circulation pump 47 for circulating the hot water in the reheating circulation path 41b is stopped (step S48). Further, in the heat medium circulation path 7, the normally open heat valve 75 is opened, the normally closed heat valve 76 is closed, and the circulation pump 31 is stopped (step S49).

  In addition, when the reheating operation at the time of hot water supply stop is completed and the hot water supply operation is performed, the same control as step S32 to step S38 in FIG. 4 is performed, and memory is calculated from the calculated total hot water supply heat [kcal] in step S45. The solar heat calorie [kcal] is calculated by subtracting the hot water flow rate used in the hot water supply operation for the tank capacity in the total gas calorie [kcal] stored in, and the calculated solar heat calorie [kcal] and carbon dioxide reduction amount [kg] is displayed on the display unit 43a of the remote controller 43 as shown in FIG.

  Further, when the reheating operation is performed during the hot water supply operation (Yes in step S46), similarly to steps S33 to S35 of FIG. 4, the hot water temperature detected by the mixed temperature detector 68 every second. And the temperature difference between the feed water temperature detected by the feed water temperature detector 54 and multiplying this temperature difference by the hot water flow rate [liter / minute / 60] detected by the water amount sensor 67, the amount of hot water supply [kcal / second] ] Is calculated and integrated, and after calculating the solar heat calorie [kcal] by subtracting the gas total calorie [kcal] calculated in step S45 from the accumulated hot water total calorie [kcal], the calculated solar heat calorie [kcal] is displayed on the display unit 43a of the remote controller 43 as shown in FIG. 2 (step S50). Then, the carbon dioxide reduction amount [kg] is calculated from the calculated solar heat calorie [kcal] and the carbon dioxide conversion coefficient, and the carbon dioxide reduction amount [kg] is displayed on the display unit 43a (step S51). When the reheating operation is performed during the hot water supply operation, it is preferable to display the solar heat amount [kcal] and the carbon dioxide reduction amount [kg] on the display unit 43a in real time every second.

  If the reheating operation is continued (No in step S52), the process returns to step S44 to calculate the amount of gas heat [kcal / sec], and when the reheating operation ends (Yes in step S52), the auxiliary In the heat source device 4, a circulation pump that closes the heat valve 46 of the reheating circulation path 41b and circulates the warm water in the warm water circulation path 41 by the reheating heating unit 4b and the hot water in the reheating circulation path 41b. The drive of 47 is stopped (step S48).

  As described above, the auxiliary heat source calculated based on the temperature difference per second between the downstream side and the upstream side of the heat radiating section 70 in the heat medium circulation path 7 and the flow rate of the heat medium flowing in the heat medium circulation path 7 per second. By calculating the total heat quantity of the auxiliary heat source by integrating the heat quantity, the solar heat quantity excluding not only the heat quantity consumed during the reheating operation performed during the hot water supply stop but also the heat quantity consumed during the reheating operation performed during the hot water supply operation is calculated. Can be calculated.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply system 2 Hot water storage tank 4 Auxiliary heat source machine 6 Hot water supply path 7 Heat medium circulation path 8 Liquid heat exchange part 9 Solar heat collector 10 Controller 23 Tank temperature detector 31 Circulation pump 41 Hot water circulation path 41b For reheating Circulation path 43 Remote control 43a Display unit 54 Water supply temperature detector 67 Water amount sensor (hot water supply flow rate detector)
68 Mixing temperature detector (hot water temperature detector)
70 Heat Dissipation Section 74a Upstream Heat Medium Temperature Detector (First Heat Medium Temperature Detector)
74b Downstream heat medium temperature detector (second heat medium temperature detector)

Claims (5)

A solar collector that collects solar heat, a hot water storage tank that stores hot water,
A heat dissipation circuit that forms a heat medium circulation path between the solar heat collector and the hot water storage tank, and heats the hot water in the hot water storage tank with a circulating heat medium by arranging a part of the circulation path in the hot water storage tank. A heat medium circuit comprising:
A feed water temperature detector for detecting a feed water temperature supplied to the hot water storage tank;
A tapping temperature detector for detecting tapping temperature of hot water flowing through a hot water supply path connected to the outlet of the hot water storage tank;
A hot water flow rate detector for detecting the hot water flow rate of hot water flowing through the hot water path connected to the outlet of the hot water storage tank;
A hot water circulation path through which hot water for heat exchange heating the heat medium circulating in the heat medium circulation path circulates;
An auxiliary heat source machine for heating the hot water circulating in the hot water circuit,
Calculates the hot water supply heat quantity based on the detected hot water temperature, tapping temperature and hot water flow rate, and calculates the auxiliary heat source heat quantity consumed when the hot water circulating in the hot water circulation path is heated by the auxiliary heat source machine. A control means for calculating the amount of solar heat used for hot water supply by subtracting the auxiliary heat source heat amount corresponding to the amount of hot water supply from the amount of heat;
A hot water storage hot water supply system using solar heat, comprising a display unit for displaying the amount of solar heat calculated by the control means. In the hot water storage type hot water supply system according to claim 1,
It has a tank temperature detector that detects the temperature of hot water in the hot water storage tank,
When the heat exchange heating of the heat medium circulating in the heat medium circulation path is performed by the hot water circulating in the hot water circulation path, the control means detects the detected temperature of the tank hot water in the hot water storage tank and the heat medium when the heat medium heating starts. A solar-powered hot water storage hot water supply system configured to calculate an auxiliary heat source heat amount based on a temperature difference from a detected temperature of hot water in a hot water storage tank at the end of heating and the amount of hot water stored in the hot water storage tank. In the hot water storage type hot water supply system according to claim 1,
A heat medium temperature detector for detecting the temperature of the heat medium in the heat medium circuit;
When the heat exchange of the heat medium circulating in the heat medium circulation path is performed by the hot water circulating in the hot water circulation path, the control means detects the temperature of the heat medium detected every predetermined time and the heat within the predetermined time. A solar-powered hot water storage hot water supply system configured to calculate an auxiliary heat source heat quantity based on the flow rate of the heat medium flowing through the medium circulation path. In the hot water storage hot water supply system using solar heat according to claim 3,
The heat medium temperature detector detects the temperature of the heat medium upstream of the heat radiating part in the heat medium circuit, and the second heat detects the temperature of the heat medium downstream of the heat radiating part. A medium temperature detector,
The control means is based on the temperature difference for each predetermined time between the downstream side and the upstream side of the heat dissipating part in the heat medium circuit and the flow rate of the heat medium that has flowed through the heat medium circuit within the predetermined time. A hot water storage hot water supply system using solar heat. In the hot water storage type hot water supply system using solar heat according to any one of claims 1 to 4,
The control means calculates the amount of carbon dioxide reduction based on the calculated amount of solar heat and the carbon dioxide conversion coefficient, and displays the amount of carbon dioxide reduction on the display unit.

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