JP5126000B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a hot water storage tank that stores therein hot water supply water boiled by a boiling heat source apparatus and hot water supply water collected by a solar heat source apparatus.

  As a prior art, there is a hot water storage type hot water supply device disclosed in Patent Document 1 below. This hot water storage type hot water supply device is composed of a heat pump unit that heats hot water in a hot water storage tank, and solar heat that heats the hot water in the hot water storage tank with a heat collecting medium that receives sunlight and is heated by a solar heat collector. Source device.

And the heat collection actual heat amount that heated the hot water supply water by the solar heat source device in the past is corrected based on the weather forecast information of the next day, and the heat collection estimated heat amount of the next day is calculated. The heat pump unit is operated so as to add a heat quantity obtained by subtracting the remaining hot water heat quantity at the start of the midnight time zone and the calculated heat collection estimated heat quantity from the necessary heat quantity.
JP 2006-153383 A

  However, when the estimated heat collection heat amount differs from the actual heat collection heat amount actually collected by the solar heat source device, for example, when the weather prediction deviates to the direction where the heat collection heat amount decreases (for example, sunny If it is actually cloudy or rainy), the amount of heat in the hot water storage tank is insufficient with respect to the amount of heat required for hot water supply per day, and there is a problem that the hot water may run out. On the other hand, if the amount of heat that is constantly boiled and stored by the heat pump unit, which is a boiling heat source device, is warned against running out of hot water, excessive boiling will occur if the weather forecast is correct, and loss due to heat dissipation, etc. Will greatly reduce efficiency.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a hot water storage type hot water supply apparatus that can prevent hot water from running out and suppress excessive boiling by a boiling heat source apparatus.

In order to achieve the above object, in the invention described in claim 1,
A hot water storage tank (21) for storing hot water supply water inside,
A boiling heat source device (22) for boiling hot water in the hot water storage tank (21);
A solar heat source device (10) that heats hot water in the hot water storage tank (21) with a heat collecting medium that receives sunlight and is heated by the solar heat collector (11);
Control means (25) for controlling the operation of the boiling heat source device (22),
The control means (25)
Based on the amount of heat collected by heating the hot water supply water by the solar heat source device (10) in the past, the heat collection estimated heat amount on the day of heating the hot water supply water by the solar heat source device (10) is set,
Heat is added to the hot water supply water at a predetermined time zone determined based on the power cost, which is obtained by subtracting the remaining hot water heat amount and the estimated heat collection heat amount at the start of the predetermined time zone determined based on the power cost from the required heat amount for hot water supply of the day In the hot water storage type hot water supply device for controlling the operation of the boiling heat source device (22),
The control means (25)
Calculate the heat collection insufficient heat amount based on the difference between the heat collection estimated heat amount and the actual heat collection heat amount on the day before the start time of the hot water supply peak time zone when the hot water use heat amount is higher than other time zones,
The boiling heat source device (22) is operated so as to increase the amount of heat corresponding to the calculated heat collection insufficient heat amount by the start time of the hot water supply peak time zone.

  According to this, even when the actual heat collection amount actually collected by the solar heat source device deviates to be less than the estimated heat collection amount, the boiling heat source device (22 ), It is possible to secure the same amount of heat as when the estimated amount of heat collected is obtained, and it is possible to prevent the hot water from running out during the hot water supply peak time period. Further, when the actual heat collection heat amount deviates less than the estimated heat collection heat amount, the boiling heat source device (22) starts the boiling operation starting from the hot water supply peak time period from a predetermined time before the start time of the hot water supply peak time period. Since it is performed so as to compensate for the insufficient heat collection amount by the time, excessive boiling can be suppressed.

  Further, in the invention according to claim 2, the control means (25) is configured such that the hot water supply water is heated by the solar heat source device (10) by using the solar heat source device (10) as a heat collecting heat amount obtained by heating the hot water supply water by the solar heat source device (10) in the past. Correction based on the weather forecast information for the day, and calculating the estimated heat collection amount for the day when the hot water supply water is heated by the solar heat source device (10).

  According to this, even when the weather prediction is off to the side where the amount of collected heat is reduced, the weather prediction is hit by the heating operation of the boiling heat source device (22) before the hot water supply peak time period starts. An equivalent amount of heat can be secured, and hot water can be prevented from running out during the hot water supply peak hours. In addition, the heating operation of the boiling heat source device (22) when the weather prediction is out of the range is the heat collection insufficient heat amount between a predetermined time before the hot water supply peak time zone and the hot water supply peak time zone start time. Since it is performed so as to compensate, excessive boiling can be suppressed.

  In the invention according to claim 3, the control means (25) sets the upper limit of the heat collection insufficient heat amount as the amount of remaining hot water at the start of a predetermined time period determined based on the power cost from the required amount of heat for hot water supply of the day and It is characterized by the amount of heat obtained by reducing the amount of heat collected on the day.

  Even if the heating heat source device (22) is not operated during a predetermined time period determined based on the power cost, if the estimated amount of heat collected exceeds the required amount of heat for hot water supply in a day, the weather prediction is lost. When the heating heat source device (22) is operated so as to increase the heat collection insufficient heat quantity based on the difference between the heat collection estimated heat quantity and the actual heat collection heat quantity of the day, the heat quantity exceeding the necessary heat quantity for hot water supply in a day is stored. It will be. Therefore, an upper limit is set for the heat collection insufficient heat quantity that the boiling heat source device (22) boils, and the upper limit value is determined based on the power cost from the necessary heat quantity for hot water supply of the day, If the amount of heat obtained by reducing the actual amount of heat collected is overheating, it is possible to suppress excessive boiling that exceeds the amount of heat required for hot water supply per day.

  In the invention according to claim 4, the control means (25) presets the amount of heat collected by the solar heat source device (10) up to a predetermined time before the start time of the hot water supply peak time zone on that day. Dividing by the ratio of the heat collectable heat amount up to the predetermined time to the heat collectable heat amount per day that varies depending on the season, the heat collection actual heat amount for calculating the heat collection insufficient heat amount is used.

  According to this, even if the heat collection completion time fluctuates depending on the season and the heat collection is not completed at a predetermined time before the start time of the hot water supply peak time of the day, The heat collection insufficient heat quantity can be calculated using the actual heat quantity. Therefore, even if the heat collection completion time varies depending on the season, excessive boiling can be reliably suppressed.

  Moreover, in invention of Claim 5, a boiling heat source apparatus (22) is a heat pump apparatus (22), It is characterized by the above-mentioned. When the heat pump device (22) is a boiling heat source device, since the output per hour of the boiling heat source device is relatively small and it takes time to increase boiling, the boiling increase after the hot water supply peak time zone is reached. In this case, the possibility of running out of hot water increases. Therefore, in the hot water storage type hot water supply device in which the boiling heat source device (22) is the heat pump device (22), the hot water supply peak time zone is started even if the weather prediction is deviated in the direction where the heat collection heat amount decreases. The effect of the present invention is that the amount of heat equivalent to that obtained when the weather prediction is made by the heating operation of the boiling heat source device (22) can be secured.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
Hereinafter, a hot water storage type hot water supply apparatus according to a first embodiment to which the present invention is applied will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus, and FIG.

  As shown in FIG. 1, the hot water storage type hot water supply apparatus of the present embodiment is a solar heat heating apparatus that is a solar heat source apparatus that heats hot water in a hot water storage tank 21 with a heat collection medium (for example, an antifreeze) heated by solar heat. 10 and a heat pump hot water supply device (heat pump hot water supply device) 20 for discharging hot water supplied by a heat pump unit (heat pump device) 22 which is a boiling heat source device having a heat pump cycle.

  The solar heating device 10 includes a solar heat collector (solar heat collector) 11 installed on the roof of a building, a heat exchanger 12 for exchanging heat between hot water in the hot water storage tank 21 and a heat collecting medium, and solar heat. A circulation fluid circuit 14 that forms a fluid circuit for circulating the heated heat collection medium from the solar heat collector 11 to the heat exchanger 12 and a heat collection control device 15 that is a heat collection control means are provided.

  The solar heat collector 11 has a fluid circuit that is heated by solar radiation inside, and is heated by circulating a heat collection medium sucked from the suction port 11a. In addition, a fluid temperature thermistor (not shown) for detecting the fluid temperature of the fluid circuit is provided, and temperature information of the heat collection medium of the solar heat collector 11 is output to the heat collection control device 15 described later.

  The heat exchanger 12 is a spiral tube disposed at a lower portion in the hot water storage tank 21 and is configured such that a heat collection medium circulates inside the tube. The circulation fluid circuit 14 is provided with a circulation pump 14 a that pumps the heat collection medium, and is electrically connected to the heat collection control device 15 and controlled.

  In addition, since hot water for hot water is stored in the hot water storage tank 21 in the order of high temperature hot water, medium temperature hot water, and low temperature hot water from the upper side to the lower side, that is, lower temperature hot water is stored downward. By disposing the heat exchanger 12 in the lower part of the hot water storage tank 21, low temperature hot water can be heated by the heat collecting medium.

  Further, in the vicinity of the inlet / outlet of the heat exchanger 12, fluid temperature sensors 12 a and 12 b for detecting the inlet / outlet fluid temperature (heat collecting medium temperature) flowing through the heat exchanger 12 and the heat collecting medium flowing through the heat exchanger 12 are installed. A flow rate counter 12c for detecting the flow rate, and the temperature information detected by the fluid temperature sensors 12a and 12b and the flow rate information detected by the flow rate counter 12c are electrically output to the heat collecting control device 15, respectively. It is connected. Here, the configuration including these fluid temperature sensors 12a and 12b and the flow rate counter 12 is a heat collection calorie measuring means.

  The heat collection control device 15 which is a heat collection control means is mainly composed of a microcomputer, and a preset heat collection control program 15a is stored in a built-in ROM (not shown). The circulation pump 14a is controlled based on temperature information from a fluid temperature thermistor (not shown) of the vessel 11, fluid temperature sensors 12a and 12b, flow rate information from the flow counter 12c, an operation signal from an operation switch (not shown), etc. Configured to control.

  The heat pump water heater 20 includes a hot water storage tank 21 that stores hot water supply water therein, a heat pump cycle that circulates the hot water supply water in the hot water storage tank 21 and performs a boiling operation, and hot water sucked from the lower portion of the hot water storage tank 21. A circulating water circuit 23 that forms a water circuit that circulates in the unit 22 and returns to the upper part of the hot water storage tank 21 and a hot water supply control device 25 that is a hot water supply control means are provided.

  The hot water storage tank 21 is a metal tank (for example, made of stainless steel) having excellent corrosion resistance, and a heat insulating material (not shown) is disposed on the outer peripheral portion, so that hot hot water can be kept warm for a long time. It is like that. The hot water storage tank 21 has a vertically long shape, and an introduction port 21a is provided on the bottom surface thereof, and a water supply pipe 13 for introducing tap water (city water) into the hot water storage tank 21 is connected to the introduction port 21a. .

  The water supply pipe 13 is provided with a pressure reducing check valve (not shown) that adjusts the water pressure of the introduced tap water to a predetermined pressure and prevents the backflow of hot water in the case of water interruption. Further, the water supply pipe 13 is provided with a water supply thermistor 13 a that is a temperature detecting means, and temperature information in the water supply pipe 13 is output to the hot water supply control device 25.

  On the other hand, a lead-out port 21b is provided at the uppermost part of the hot water storage tank 21, and the lead-out port 21b is for leading out the hot water for hot water stored in the upper portion of the hot water stored in the hot water storage tank 21. A high temperature take-out pipe 26 (upper lead-out pipe) is connected.

  A discharge pipe provided with a relief valve (not shown) is connected in the middle of the path of the high temperature take-out pipe 26. When the pressure in the hot water storage tank 21 rises above a predetermined pressure, The hot water supply water is discharged to the outside so as not to damage the hot water storage tank 21 and the like.

  Further, the configuration denoted by reference numeral 27 shown in the figure is an intermediate temperature extraction pipe (intermediate portion) for extracting medium temperature hot water having a hot water temperature lower than that of high temperature hot water among hot water stored in the hot water storage tank 21. A lead-out pipe) and is connected to a substantially central portion of the hot water storage tank 21 in the vertical direction.

  Further, a configuration denoted by reference numeral 29 shown in the drawing is a high / intermediate temperature mixing valve provided at a downstream side joining portion of the high temperature take-out pipe 26 and the intermediate temperature take-out pipe 27, and circulates in the downstream hot water supply pipe 28. This is a temperature control valve that adjusts the hot water temperature of the hot water supply. The high / medium temperature mixing valve 29 adjusts the opening area ratio between the high temperature take-out pipe 26 side and the medium temperature take-out pipe 27 side so that the hot water for hot water taken out from the high temperature take-out pipe 26 and the medium temperature taken out from the intermediate temperature take-out pipe 27 The mixing ratio with hot water is adjusted.

  In this example, the high / medium temperature mixing valve 29 circulates the hot water supply water having a hot water temperature of about 5 ° C. higher than the set temperature operated by an operation panel (not shown) through the hot water supply pipe 28. The high / medium temperature mixing valve 29 is electrically connected to the hot water supply control device 25 and is feedback-controlled based on temperature information detected by a thermistor (not shown) provided in the hot water supply pipe 28.

  The hot water supply pipe 28 is a hot water supply pipe whose downstream end communicates with a hot water faucet (not shown) such as a kitchen or a bathroom. A hot water mixing valve 30, a hot water supply thermistor 28 a, and a flow rate counter 28 b are provided on the way to the use side terminal. Is provided.

  The hot water supply thermistor 28 a outputs temperature information in the hot water supply pipe 28, and the flow rate counter 28 b outputs flow information in the hot water supply pipe 28 to the hot water supply control device 25. The hot water mixing valve 30 is a temperature control valve that adjusts the temperature of hot water to be discharged from a hot water tap (not shown), and the temperature of the hot water mixing valve 29 is adjusted by adjusting the ratio of the respective opening areas. It is controlled to adjust the mixing ratio of the supplied hot water and tap water to the set temperature operated on the operation panel.

  The hot-water supply mixing valve 30 is electrically connected to the hot-water supply control device 25, and is feedback-controlled based on the hot-water temperature of the hot-water supply water detected by the hot-water supply thermistor 28b.

  A suction port 21 c for sucking tap water in the hot water storage tank 21 is provided in the vicinity of the introduction port 21 a on the bottom surface of the hot water storage tank 21, and hot water is discharged into the hot water storage tank 21 above the hot water storage tank 21. A discharge port 21d is provided. The suction port 21c and the discharge port 21d are connected by a circulating water circuit 23, and a part of the circulating water circuit 23 is disposed in a heat pump unit 22 that is a boiling heat source device.

  Further, a heat exchanger (not shown) is provided in a portion of the circulating water circuit 23 arranged in the heat pump unit 22, and the hot water in the hot water storage tank 21 sucked from the suction port 21c is exchanged with the high-temperature refrigerant. The water for hot water supply in the hot water storage tank 21 can be boiled by heating and returning it from the discharge port 21d into the hot water storage tank 21.

  In addition, the heat pump unit 22 of the present embodiment is a supercritical heat pump using, for example, carbon dioxide as a refrigerant, which includes refrigerant functional parts constituting a heat pump cycle such as a compressor, a radiator, a decompressor, and an evaporator (not shown). This supercritical heat pump refers to a 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, and may be ethylene, ethane, nitrogen oxide or the like as a refrigerant in addition to carbon dioxide. According to the supercritical heat pump using carbon dioxide as a refrigerant, hot water can be boiled at a relatively high temperature (for example, about 85 ° C. to 90 ° C.).

  The heat pump unit 22 is operated by a control signal from the hot water supply control device 25 and outputs an operating state to the hot water supply control device 25. Further, a hot water temperature sensor 21e for detecting the hot water temperature in the upper part of the hot water storage tank 21 is provided on the upper outer wall surface of the hot water storage tank 21, and temperature information of the hot water temperature derived from the outlet 21b is described later. The data is output to the control device 25.

  On the outer wall surface of the hot water storage tank 21, a plurality of water level thermistors 24 are arranged at substantially equal intervals in the vertical direction, and temperature information at each water level filled in the hot water storage tank 21 is output to the hot water supply control device 25. It is like that. As a result, based on the temperature information from the water level thermistor 24, it is possible to detect the temperature boundary position between the hot water supply water that has been boiled above the hot water storage tank 21 and the water that has not yet been boiled down inside the hot water storage tank 21. ing.

  The hot water supply control device 25 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset hot water supply control program. The hot water supply thermistor 13a, the hot water supply thermistor 28a, the hot water temperature sensor 21e. Based on temperature information from various thermistors (not shown) and operation signals from an operation panel (not shown), the actuators in the heat pump unit 22, the high / medium temperature mixing valve 29, the hot water mixing valve 30 and the like are controlled. ing.

  The hot water supply control device 25 is connected to the heat collection control device 15 described above by either wireless communication or wired communication, and is configured to receive heat collection information on the solar heating device 10 side.

  By the way, in the hot water supply control device 25 of the present embodiment, in addition to the hot water supply control program, a temperature-controlled hot water supply control program (boiling hot water storage control program) 25a for performing a boiling operation of hot water in the hot water storage tank 21 is provided. The heating operation is performed in a predetermined time period determined based on the power cost, specifically, in the late-night time period (for example, 11:00 pm to 7:00 of the next morning) when the power rate is relatively low.

  In this boiling operation, when the midnight time zone is reached, the heat pump unit 22 is operated based on the temperature information from each water level thermistor 24 and temperature sensor to heat the low temperature water in the lower part of the hot water storage tank 21 to a high temperature ( For example, it is stored as hot water for 85 ° C. hot water. Accordingly, at the end of the midnight time zone (for example, 7:00 am), the hot water storage amount corresponding to the necessary amount of heat for hot water supply used in a day is stored in the hot water storage tank 21. However, when it is used outside the midnight hours exceeding the preset amount of stored hot water, it is set so that the boiling operation is performed when the amount of stored hot water becomes less than the predetermined minimum amount of stored hot water.

  Next, the operation will be described based on the control processing of the temperature-controlled hot water supply control program 25a shown in FIG. 2 which is a main part of the present invention. As shown in FIG. 2, first, the hot water supply control device 25, which is a control means, determines whether or not a first predetermined time has come (step 210). For example, if it is determined that the current time has reached 11:00 pm, which is the start time of a midnight time zone that is a predetermined time zone determined based on the power cost, the control processing of the temperature-controlled hot water supply control program 25a is started.

  Then, the heat collection heat amount SQ is read from the temperature and water level information from each water level thermistor 24 and the heat collection information from the heat collection control device 15 (step 220). Here, the heat collection heat amount SQ indicates the amount of heat obtained by heating the hot water supply water in the hot water storage tank 21 with the heat collection medium collected by the solar heat collector 11, and the heat collection control device that controls the solar heat heating device 10. The heat collection heat quantity SQ obtained by the heat collection heat quantity calculation means provided in 15 is read.

  For example, when the temperature of the heat collection medium heated by solar heat is equal to or higher than a predetermined temperature with respect to the hot water temperature in the vicinity of the heat exchanger 12 in the hot water storage tank 21, the circulation pump 14 a is activated and the solar heat collector 11. The heat collection medium heated in step 1 is circulated to the heat exchanger 12. Thereby, the hot water supply water in the hot water storage tank 21 is heated. And if the temperature difference reaches below predetermined temperature, the circulation pump 14a will stop and the heating with a heat collecting medium will be stopped.

  At this time, the heat collection control device 15 collects the heating amount per unit time output from the heat exchanger 12 based on the temperature and flow rate information detected by the fluid temperature sensors 12a and 12b and the flow rate counter 12c. It is obtained and accumulated by the calorific value calculating means, and is learned and stored as the collected heat amount SQ per day.

  Then, the heat collection heat amount SQ per day is stored for the most recent predetermined period (for example, 10 days, or 1 week to 2 weeks), and when the heat collection heat amount SQ is read in step 220 The maximum value is obtained and read based on data for a predetermined period in the past. By obtaining the maximum value of the amount of heat collected during the most recent predetermined period, the amount of heat collected SQ during sunny weather with seasonal variations can be obtained relatively easily.

  When step 220 is executed, the weather prediction information is acquired by the weather prediction information acquisition means (not shown) via the Internet or FM multiplex communication, and the acquired weather prediction information for the next daytime daytime (daytime using hot water supply water) is read. (Step 230). Here, the weather prediction information is acquired from the outside through the communication means, but for example, an atmospheric pressure sensor is provided, and the weather prediction information is generated by itself according to a change in the pressure value obtained from the atmospheric pressure sensor. It may be.

  When step 230 is executed, a required amount of heat Q2 for hot water supply per day is obtained (step 240). The required amount of heat for hot water supply Q2 is to obtain the required amount of heat of hot water for use in the hot water supply to be used the next day. In this embodiment, the amount of heat of the hot water supplied from the hot water supply pipe 28 is adjusted. Based on the temperature and flow rate information detected by the hot water supply thermistor 13a, the hot water supply thermistor 28a, the flow rate counter 28b, etc., the hot water supply heat amount per unit time is obtained and accumulated, and the hot water supply control device 25 as the necessary heat amount Q2 for hot water supply per day is accumulated. Learn and remember at.

  Then, the necessary amount of heat Q2 for hot water supply per day is stored for at least the most recent predetermined period (for example, for 10 days, or for one week to two weeks), and in step 270, the necessary amount of heat Q2 for hot water supply is stored. When obtaining, the average value is obtained based on the data for the most recent predetermined period.

  Next, a residual heat quantity Q1 is obtained (step 250). This residual heat quantity Q1 is the stored hot water quantity of unused hot water at the first predetermined time in step 210, and for example, obtains the quantity of hot water at a predetermined temperature (for example, about 60 ° C.) or more, Obtained based on the temperature and water level information from each water level thermistor 24 acquired in step 220.

  When step 250 is executed, a correction coefficient K for correcting the heat collection heat amount SQ is calculated from the weather prediction information read in step 230 (step 260). For example, the correction coefficient K = 1 is determined when the weather prediction information is clear, the correction coefficient K = 0.5 is determined when it is cloudy, and the correction coefficient K = 0 is determined when it is raining.

  Therefore, by multiplying the correction coefficient K calculated in step 260 by the heat collection heat amount SQ at the time of fine weather obtained in step 220, the heat collection estimated heat amount (predicted collection) estimated to be able to collect heat in the daytime using hot water supply water. Heat quantity) K · SQ can be calculated.

  Thus, since the correction coefficient K corrects the heat collection heat amount SQ in a fine weather, in step 220, when the heat collection heat amount SQ is read, the heat collection heat amount per day over the most recent past predetermined period. May be divided by the correction coefficient K based on the weather performance of the day (except during rainy weather), and the average value thereof may be calculated as the heat collection heat quantity SQ during sunny weather. . According to this, although the calculation process is more complicated than when using the maximum heat collection heat amount per day for the most recent past predetermined period, the heat collection heat amount SQ in fine weather with seasonal variations can be obtained with high accuracy. Can do.

  After performing up to step 260, next, the required amount of heating heat Q is calculated (step 270). Specifically, the required amount of heating Q is calculated from the following formula 1.

(Formula 1)
Q = Q2-Q1-K ・ SQ
That is, the necessary boiling heat quantity Q for securing the necessary heat quantity Q2 for hot water supply is calculated by taking into account the remaining hot water quantity Q1 and the estimated heat collection heat quantity K · SQ predicted to be heated by the heat collection medium.

  When step 270 is completed, the heat pump unit 22 is driven to bring up the required boiling so that the boiling is completed during the midnight hours (preferably, the boiling is completed just before the end time of the midnight hours). A heating operation is performed so that the heat quantity Q is added and the heat quantity Q + Q1 is stored from the upper part of the hot water storage tank 21 (step 280). Here, since the required amount of heating heat Q can be made relatively small, energy saving can be achieved in the heating heat storage operation of the heat pump unit 22.

  Then, after the midnight time period is over, it is daytime, the temperature of the heat collection medium received by the solar heat collector 11 and heated by solar heat is the hot water temperature in the vicinity of the heat exchanger 12 in the hot water storage tank 21. When the temperature is higher than the predetermined temperature, the circulation pump 14 a is activated and the heat collection medium heated by the solar heat collector 11 is circulated to the heat exchanger 12. Thereby, the hot water supply water of the lower part is heated and heated up rather than the hot water supply water boiled by the heat pump unit 22 in the hot water storage tank 21.

  In the daytime period, the hot water supply control device 25 determines whether or not the second predetermined time has come (step 290). For example, if it is determined that the current time has reached 15:00, which is a predetermined time before the start time 17:00 of the hot water supply peak time zone, the process proceeds to step 300. Here, the hot water supply peak time zone is a time zone in which the amount of hot water used is larger than other time zones, and for example, 17:00 to 23:00, which uses a lot of hot water from the evening to the night, is used. it can.

  In step 300, the heat collection heat amount of the current day (from morning to 15:00) is read from the heat collection control device 15 and used as the heat collection actual heat amount SQz. Then, the heat collection estimated heat amount (predicted heat collection heat amount) K · SQ used in step 270 is read (step 310), and the heat collection insufficient heat amount (insufficient heat collection heat amount) ΔQmns is calculated (step 320). Specifically, the heat collection unmeasured heat amount ΔQmns is calculated from the following mathematical formula 2.

(Formula 2)
ΔQmns = K · SQ-SQz
That is, the heat collection insufficient heat amount ΔQmns is calculated from the difference between the heat collection estimated heat amount K · SQ and the heat collection actual heat amount SQz.

  When step 320 is executed, the heat pump unit 22 is driven to increase the amount of heat corresponding to the insufficient heat collection amount ΔQmns by the start time of the hot water supply peak time period, and the boiling operation for storing hot water from the upper part of the hot water storage tank 21 is performed. (Step 330). However, although not shown in the flowchart, when the heat collection insufficient heat amount ΔQmns calculated in step 320 is as small as less than a predetermined value, the heat pump unit 22 cannot be operated efficiently, so step 330 is not performed.

  If the hot water storage heat amount in the hot water storage tank 21 is insufficient with respect to the learning value of the hot water use heat amount in the hot water supply peak time zone at the start time (for example, 17:00) of the hot water supply peak time zone, The heat pump unit 22 is operated to increase the deficient amount of heat, and the boiling increase operation is performed.

  Further, the hot water supply control device 25 secures the minimum amount of hot water stored regardless of the time when the amount of hot water stored in the hot water storage tank 21 falls below a preset minimum amount of hot water stored (for example, 50 L) for preventing hot water shortage. The heat pump unit 22 is further heated.

  In this embodiment, the control operation of the flow shown in FIG. 2 is performed by the hot water supply control device 25 that is a control means, but a part of the control step may be performed by the heat collection control device 15 side. . That is, the control means may be the heat collection control device 15 and the hot water supply control device 25.

  Further, the heat collection heat amount SQ by the solar heating device 10 is obtained on the heat collection control device 15 side, and the hot water supply control device 25 is configured to read the heat collection heat amount SQ, but not limited to this, on the heat collection control device 15 side. The detected values of the fluid temperature sensors 12a and 12b and the flow rate counter 12c, which are the collected heat quantity measuring means, are directly read by the hot water supply control device 25, and the heating amount per unit time based on the read temperature and flow rate information. May be obtained and accumulated, and learned and stored as the heat collection heat amount SQ per day. Then, the heat collection heat amount SQ per day may be stored for a predetermined period on the hot water supply control device 25 side, and the maximum value may be obtained from the data for the predetermined period.

  Also, the heat collection actual heat amount SQz may be calculated by the hot water supply control device 25 in the same manner as the heat collection heat amount SQ.

  According to the above-described configuration and operation, the hot water supply control device 25 serving as the control means corrects and predicts based on the weather prediction information at 15:00, which is a predetermined time before the start time 17:00 of the hot water supply peak time zone. Calculate the heat collection insufficient heat quantity ΔQmns from the difference between the estimated heat quantity K · SQ and the actual heat collection heat quantity SQz of the day, and increase the calculated heat collection insufficient heat quantity ΔQmns by 17:00 in the hot water supply peak time zone As described above, the heat pump unit 22 is reheated.

  Therefore, even if the weather prediction is off when the heat collection heat amount decreases in the daytime period, the weather prediction hits as predicted by the heating operation of the heat pump unit 22 before the hot water supply peak time period starts. The amount of heat equivalent to the case where heat can be collected can be secured, and hot water can be prevented from running out during the hot water supply peak time period. In addition, the heating operation of the heat pump unit 22 when the weather prediction is out of order compensates for the heat collection insufficient heat amount ΔQmns between two hours before the start time of the hot water supply peak time period and the start time of the hot water supply peak time period. Therefore, excessive boiling can be suppressed.

  Here, the operation example of this embodiment is demonstrated using FIG. 3 and FIG. 3 and 4 schematically show the hot water storage state in the hot water storage tank 21 at each time, and the broken line in the hot water storage tank 21 shows the boundary of hot water with different temperatures stacked in layers. When there is one, the upper part is hot water and the lower part is cold water, and when there are two broken lines, the upper part is hot water, the middle part is medium hot water, and the lower part is cold water. And hot water having an amount of heat that can be used for hot water supply. The same applies to FIG. 5 showing the comparative example.

  Note that FIG. 3 shows a case where the weather prediction is applied during the daytime period (for example, when the weather prediction is clear and actually clear), and FIGS. 4 and 5 show the weather prediction during the daytime period. It shows a case where it deviates (for example, when the weather prediction is sunny and actually rainy).

  According to the present embodiment, as shown in FIG. 3, a relatively small amount of heating is performed by subtracting the amount of heat collected during the daytime period from midnight, and when the weather is predicted during the daytime period, At the time of 15:00, hot water corresponding to the estimated amount of collected heat is stored below the heated hot water. Therefore, the required amount of heat in the hot water supply peak time zone when the hot water supply load is high is almost secured based on the daily required hot water supply heat amount at 17:00, and the amount of hot water stored in the hot water storage tank 21 at the time of 17:00 is the hot water supply peak time. If there is an insufficiency with respect to the learned value of the hot water use heat amount of the belt, the insufficient heat amount can be increased, and the bath can be refilled and hot water can be supplied without running out of hot water during the hot water supply peak time zone.

  In addition, as shown in FIG. 4, when a relatively small amount of heating is performed by subtracting the amount of heat collected during the daytime during the midnight hours, and the weather forecast is off during the daytime hours, At the bottom of the boiling hot water storage water, hot water with less heat than the expected heat collection heat amount is collected or not collected (in this example, there is no collected hot water). However, the insufficient heat quantity corresponding to the difference between the predicted heat collection heat quantity and the actual heat collection heat quantity is increased between 15:00 and 17:00. Therefore, at the time of 17:00, as in the case of the weather prediction, the necessary amount of heat in the hot water supply peak time period when the hot water supply load is high is almost ensured based on the daily required amount of hot water supply. If the amount of stored hot water in the hot water storage tank 21 is insufficient with respect to the learning value of the hot water use heat amount during the hot water supply peak time period, the insufficient heat amount is increased, and the hot water in the bath without causing hot water shortage during the hot water supply peak time period. Tensioning and hot water supply can be performed.

  On the other hand, in the case of control without performing steps 290 to 330 shown in FIG. 2, as shown in FIG. 5, relatively little boiling is performed by subtracting the estimated amount of heat collected during the daytime period from the midnight time period. If the weather forecast is off during the daytime, hot water with less heat than the estimated amount of collected heat is collected under the boiling hot water at 17:00, or the collected heat is stored (In this example, there is no hot water collected). Therefore, the required amount of heat in the hot water supply peak time zone when the hot water supply load is high at 17:00 is greatly insufficient, and the stored heat amount in the hot water storage tank 21 at 17:00 is the learned value of the hot water use heat amount in the hot water supply peak time zone. As there is a shortage, the amount of deficient heat will increase, but it has already entered the hot water supply peak time zone, and when the hot water filling and hot water supply etc. of the hot water supply peak time are done, the increase in boiling time is not in time, Causes running out of hot water.

  As described above, according to the present embodiment, even when the weather prediction is off during the daytime period, the temperature rises by 17:00 when the hot water supply peak time period starts, and the weather prediction hits and collects as predicted. It is possible to secure the same amount of heat as when heat is generated, and it is possible to prevent the hot water from running out during the hot water supply peak time period.

  Moreover, since the estimated heat collection amount is calculated based on the actual heat collection amount collected in the hot water supply water by the solar heating device 10 in the most recent predetermined period and the weather forecast information of the day collected in the hot water supply water, It is possible to accurately calculate the estimated heat collection amount while correcting the actual heat amount by the weather prediction information and taking into account seasonal variations.

  Further, when the heat pump unit 22 is used as a heating heat source device, the heat pump has a relatively small output per hour and takes time to increase the boiling time. Increased boiling from increases the possibility of running out of hot water. Therefore, in the case where the heat pump unit 22 is a boiling heat source device as in the present embodiment, even if the weather prediction deviates in the direction where the heat collection heat amount is reduced, the heat pump is reached before the hot water supply peak time period starts. The effect that it is possible to ensure the same amount of heat as when the weather prediction is made by the additional heating operation of the unit 22 is extremely large.

  Moreover, the installation space can be reduced because it is not necessary to provide a separate tank for storing the heat collection medium heated by the solar heat collector 11.

  In addition, the solar heating device 10 includes heat collecting heat quantity measuring means for measuring the heat collecting heat quantity SQ output from the heat exchanger 12 to the hot water supply water by the fluid temperature sensors 12a and 12b and the flow rate counter 12c. The amount of heat collected can be easily calculated from the temperature, flow rate information, etc. of the heat collection medium circulating in the vessel 12.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.

  Compared to the first embodiment described above, the second embodiment sets an upper limit on the amount of heat that corresponds to the heat collection deficient heat that rises by the start time of the hot water supply peak time period, and further suppresses excessive boiling. Is different. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, in the second embodiment, when the hot water supply control device 25 determines in step 290 that the second predetermined time (for example, 15:00) has been reached, in step 300, on the current day. The collected heat amount (from morning to 15:00) is read from the heat collection control device 15 and is used as the collected heat amount SQz. In step 310, the estimated heat collection amount (predicted heat collection amount) K · SQ is read, and the difference (K · SQ-SQz) between the estimated heat collection amount K · SQ and the actual heat collection amount SQz is calculated (step 312). ).

  Next, a heat quantity (Q2-Q1-SQz) obtained by subtracting the remaining hot water heat quantity Q1 and the heat collection actual heat quantity SQz from the required hot water supply quantity Q2 for one day is calculated (step 314). Then, the heat quantity calculated in step 312 (K · SQ−SQz) and the heat quantity calculated in step 314 (Q2−Q1−SQz) are compared, and the smaller one is the heat collection insufficient heat quantity (insufficient heat collection heat quantity) ΔQmns. (Step 322).

  If step 322 is performed, it will progress to step 330 and will perform a boiling increase operation similarly to 1st Embodiment.

  In the first embodiment, the heat quantity (K · SQ−SQz) is set to the heat collection insufficient heat quantity (insufficient heat collection heat quantity) ΔQmns. However, in the second embodiment, the heat quantity (K · SQ−SQz) is collected. Although the amount of insufficient heat (insufficient heat collection amount) ΔQmns is set, this is equivalent to the restriction that the upper limit of the heat collection insufficient heat amount ΔQmns is set as the amount of heat (Q2-Q1-SQz).

  Even if the heat pump unit 22 is not operated at midnight, if the estimated amount of heat K · SQ is added and the required amount of heat Q2 for hot water supply per day is exceeded, the heat collection is estimated at 15:00 to 17:00 When the heat pump unit 22 is operated so as to increase the heat collection insufficient heat quantity ΔQmns which is the difference between the heat quantity K · SQ and the actual heat collection heat quantity SQz on the day, the heat quantity exceeding the necessary heat quantity Q2 for hot water supply per day is stored. Unnecessary reheating is performed.

  Therefore, an upper limit is set for the heat collection insufficient heat quantity ΔQmns that the heat pump unit 22 increases, and the upper limit value is set as a heat quantity (Q2-Q1-SQz) obtained by subtracting the remaining hot water heat quantity Q1 and the actual heat collection heat quantity SQz from the required hot water supply quantity Q2. Yes. Thereby, the excessive boiling over the required amount of heat Q2 for hot water supply can be suppressed.

  In the above description, the amount of heat (K · SQ−SQz) calculated in step 312 in step 322 is compared with the amount of heat (Q2−Q1−SQz) calculated in step 314, and the smaller one is defined as a heat collection insufficient heat amount ΔQmns. However, the comparison of heat quantity is not limited to this, and it may be a comparison with the same meaning.

  Comparing the estimated heat collection amount K · SQ and the amount of heat (Q2−Q1), when the amount of heat K · SQ is smaller, the amount of heat (K · SQ−SQz) is set as the insufficient heat collection amount ΔQmns and the amount of heat (Q2−Q1) ) Is smaller, the heat quantity (Q2-Q1-SQz) may be set as the heat collection insufficient heat quantity ΔQmns.

  Further, when the required amount of heating Q calculated in step 270 is a positive value, the amount of heat (K · SQ-SQz) is set to a heat collection insufficient amount of heat ΔQmns, and when the required amount of heating Q is a negative value, the amount of heat (Q2−Q1). -SQz) may be the heat collection insufficient heat quantity ΔQmns.

  Further, when the boiling operation is performed in step 280, the heat quantity (K · SQ-SQz) is set to the heat collection insufficient heat quantity ΔQmns, and when the boiling operation is not performed in step 280, the heat quantity (Q2-Q1-SQz) is collected. The insufficient heat quantity ΔQmns may be used.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.

  Compared to the first embodiment described above, the third embodiment has been completed when heat collection shortage calorie is calculated in consideration of the fact that the heat collection completion time varies depending on the season. Even if it is not, the heat collecting insufficient heat amount is calculated using the heat collecting actual heat amount at the time of completion of heat collecting, and the excessive boiling is reliably suppressed. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the first embodiment, in step 320, the heat collection unexpected heat amount ΔQmns is calculated by the above-described equation 2, but in the third embodiment, the actual heat collection heat amount SQz at the time of 15:00 on that day is calculated. Divided by the correction coefficient K2, the actual heat collection amount per day is obtained. In step 320 of the present embodiment, specifically, a heat collection unexpected heat amount ΔQmns is calculated from the following mathematical formula 3.

(Formula 3)
ΔQmns = K · SQ−SQz ÷ K2
Here, the correction coefficient K2 is the ratio of the heat collectable heat amount at the time of heat collection (at 15:00) to the heat collectable heat amount of the day, for example, the date (calendar) as shown in FIG. 7 and the correction coefficient. The relationship with K2 is preset.

  As shown in FIG. 7, the correction coefficient K2 is set to “1” to complete heat collection by 15:00 (collection of 100% heat) from the autumn day to the spring day, with the summer solstice day as the center. For about two months, the correction coefficient K2 is set to “0.8” in order to complete 80% heat collection (collect 80% heat) by 15:00.

  In addition, from the spring equinox day to one month before the summer solstice, the correction factor K2 is gradually decreased according to the ratio of completing heat collection by 15:00, and from one month after the summer solstice to the autumn equinox day. The correction coefficient K2 is gradually increased according to the ratio of completing the heat collection by 15:00.

  In this way, the heat collection actual heat amount SQz at 15:00 is corrected by dividing by the ratio of the heat collection possible heat amount up to 15:00 with respect to the heat collection heat amount of the day that fluctuates depending on the preset season, and the heat collection unexpected heat amount The actual heat collection heat amount for calculating ΔQmns is used. As a result, the heat collection completion time varies depending on the season, and even if heat collection is not completed at 15:00, which is a predetermined time before the start time 17:00 of the hot water supply peak time zone, the heat collection is completed. The heat collection insufficient heat quantity can be calculated using the actual heat collection heat quantity at the time. Therefore, even if the heat collection completion time varies depending on the season, excessive boiling can be reliably suppressed.

  If heat collection at 15 o'clock is not completed in summer, etc., if the actual heat collection at 15 o'clock is used as is, the amount of heat collected after 15 o'clock will not be taken into account, and excess boiling will occur by 17 o'clock. As a countermeasure, if the heat collection time is too close to the start time of the hot water supply peak time zone as a countermeasure, sufficient boiling time cannot be secured, and boiling is not completed. There may be a case where a hot water supply peak time is reached and a hot water shortage occurs. According to the present embodiment, it is possible to prevent such a problem from occurring.

  Here, the start of heating is fixed at 15:00 from the heat collection, but if the heating time can be secured by the start time of the hot water supply peak time, the time will be shifted according to the season. There may be. For example, throughout the year, the time when the ratio of the heat collection heat amount to the heat collection heat amount per day is 80% may be changed as a time that is a predetermined time before the start time 17:00 of the hot water supply peak time zone. Good.

(Other embodiments)
In each said embodiment, the hot water supply control apparatus 25 correct | amends the heat collection calorie | heat amount which heated the hot water supply water with the solar heating apparatus 10 in the past based on the weather prediction information on the day when the hot water supply water is heated with the solar heating apparatus 10. The heat collection estimated heat amount on the day when the hot water supply water is heated by the solar heating device 10 is calculated. However, the present invention is not limited to this. For example, a constant coefficient is always multiplied by the heat collection heat amount. For example, the estimated heat collection amount for the day may be set.

  According to this, even when the actual heat collection heat amount actually collected by the solar heating device 10 deviates to be less than the estimated heat collection heat amount, the heat pump device 22 is heated up until the hot water supply peak time period starts. The operation can secure the same amount of heat as when the estimated heat collection heat amount is obtained, and can prevent the hot water from running out during the hot water supply peak time period. In addition, the heating operation of the heat pump device 22 when the actual heat collection heat amount deviates less than the heat collection estimated heat amount is between a predetermined time before the hot water supply peak time zone and the hot water supply peak time zone start time. Therefore, excessive boiling can be suppressed.

  Further, in each of the above embodiments, the heat pump unit 22 that is a boiling heat source device is a device having a supercritical heat pump cycle in which the refrigerant pressure on the high pressure side exceeds the critical pressure, but is not limited thereto, A heat pump cycle in which the high-pressure side refrigerant pressure is equal to or lower than the critical pressure may be provided. The boiling heat source device is not limited to a heat pump device, and may be a heat source device that boils hot water using an electric heater, for example.

It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 1st Embodiment to which this invention is applied. It is a flowchart which shows the boiling operation control operation of the hot water supply control apparatus 25 in 1st Embodiment. It is a figure explaining the operation example of the hot water storage type hot water supply apparatus in 1st Embodiment. It is a figure explaining the operation example of the hot water storage type hot water supply apparatus in 1st Embodiment. It is a schematic diagram explaining the operation example of the hot water storage type hot-water supply apparatus which is a comparative example. It is a flowchart which shows the boiling operation control operation | movement of the hot water supply control apparatus 25 in 2nd Embodiment. It is a graph which shows the relationship between the date and the correction coefficient K2 in 3rd Embodiment.

Explanation of symbols

10 Solar heating device (solar heat source device)
11 Solar collector (solar collector)
12 heat exchanger 15 heat collection control device 20 heat pump hot water supply device 21 hot water storage tank 22 heat pump unit (heat pump device, boiling heat source device)
25 Hot water supply control device (control means)

Claims (5)

A hot water storage tank (21) for storing hot water supply water inside,
A boiling heat source device (22) for boiling hot water in the hot water storage tank (21);
A solar heat source device (10) for heating hot water supply water in the hot water storage tank (21) by a heat collecting medium heated by receiving sunlight with a solar heat collector (11);
Control means (25) for controlling the operation of the boiling heat source device (22),
The control means (25)
Based on the amount of heat collected by heating the hot water supply water by the solar heat source device (10) in the past, the heat collection estimated heat amount on the day of heating the hot water supply water by the solar heat source device (10) is set,
In the predetermined time zone determined based on the power cost, the boiling heat source device (22) is added so as to add a heat amount obtained by subtracting the remaining hot water heat amount at the start of the predetermined time zone and the estimated heat collection heat amount from the required heat amount for hot water supply of a day. ) In the hot water storage water heater that controls the operation of
The control means (25)
A predetermined amount of time before the start time of the hot water supply peak time period when the amount of heat used for hot water supply is higher than other time periods, and calculates a heat collection insufficient heat quantity based on the difference between the estimated heat collection heat quantity and the actual heat collection heat quantity of the day,
The hot water storage type hot water supply device, wherein the boiling heat source device (22) is operated so as to increase the amount of heat corresponding to the heat collection insufficient heat amount by the start time of the hot water supply peak time zone.   The said control means (25) is based on the weather prediction information on the day when the hot-water supply water is heated by the said solar-heat-source device (10) about the amount of heat collection which heated the hot-water supply water by the said solar-heat-source device (10) in the past. The hot water storage type hot water supply apparatus according to claim 1, wherein the heat collection estimated heat quantity on the day when the hot water supply water is heated by the solar heat source apparatus (10) is calculated.   The said control means (25) makes the upper limit of the said heat collection insufficient heat amount into the calorie | heat amount which reduced the said remaining hot water calorie | heat amount and the said heat collection actual calorie | heat amount from the said required heat amount for hot water supply, The Claim 1 or Claim The hot water storage type hot water supply apparatus according to 2.   The control means (25) adjusts the amount of heat collected by the solar heat source device (10) up to the predetermined time before the start time of the hot water supply peak time zone on the day, which fluctuates according to a preset season. 2. The actual heat collection amount for calculating the heat collection insufficient heat amount is divided by a ratio of the heat collection possible heat amount up to the predetermined time to the heat collection possible heat amount to be the actual heat collection heat amount for calculating the heat collection insufficient heat amount. 4. The hot water storage type hot water supply apparatus according to any one of 3 above.   The hot water storage type hot water supply device according to any one of claims 1 to 4, wherein the boiling heat source device (22) is a heat pump device (22).

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