JP2006153383A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a storage type water heater capable of improving energy saving and keeping low maintenance costs by mounting a hot water supply control means constituted to heat a water for hot water supply by collection heat quantity, and implementing heat storage operation by necessary boiling-up heat quantity obtained by reducing the collection heat quantity. <P>SOLUTION: This storage type water heater comprises a hot water storage tank 21, a heat pump unit 22 circulating the water for hot water supply in the hot water storage tank 21 to implement the heat storage operation, and a hot water supply control device 25 implementing the heat storage operation while controlling the heat pump unit 22 in accordance with the necessary heat quantity for hot water supply. The water heater is provided with a solar-heat heating device 10 having a solar heat collecting unit 11 for heating a heat collecting medium by solar heat, and further heating the water for hot water supply in the hot water storage tank 21 by the heat collecting medium heated by the solar heat collecting unit 11, and the hot water supply control device 25 implements the heat storage operation in accordance with the necessary boiling-up heat quantity obtained by reducing the collection heat quantity by the solar heat heating device 10, from the necessary heat quantity for hot water supply, when the heat storage operation is implemented in a prescribed time zone. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a hot water storage tank that stores hot water supply water boiled by a heat source device composed of a heat pump cycle, and particularly relates to hot water supply control means for heating a part of hot water supply water by solar heat.

  Conventionally, as a hot water storage type hot water supply apparatus using solar heat, for example, as shown in Patent Document 1, a solar heat collector, a blowing means, a heat pump circuit having a variable capacity compressor, and a solar heat collector are passed. Heat pump circuit evaporator that exchanges heat with air, collector inlet air temperature sensor, evaporator outlet air temperature sensor, and compressor so that the evaporator outlet air temperature is substantially the same as the collector inlet air temperature And a compression function force variable control means for setting the number of rotations.

  Then, on a sunny day with good weather, high temperature air that has received solar heat from the solar heat collector is supplied to the evaporator, so that the evaporation temperature becomes high and the efficiency of the heat pump cycle is improved.

Further, on a cloudy day or a rainy day when the weather is bad, the compression function force variable control means is configured to operate the compressor according to a preset compressor rotation speed. As a result, even when the amount of solar radiation is small or not at all, it is possible to operate the compressor by setting the number of revolutions of the compressor in the optimum state with the required heating capacity and efficiency, so the heating capacity of the heat pump circuit is reduced. The heating operation is ensured and efficient (see, for example, Patent Document 1).
JP 2002-286323 A

  However, according to the above-mentioned Patent Document 1, solar heat is converted into warm air applied to the evaporator to reduce the size of the evaporator to improve the efficiency of the heat pump cycle, and the rotation of the compressor even when there is no solar radiation. The number is changed so that the above efficient heat storage operation is performed, so that energy saving and low maintenance cost can be obtained.

  However, in a heat source device that consists of a heat pump cycle that stores heat during the midnight hours when the stored price of the hot water supply is low and the price setting is low the day before, use solar heat to operate during the midnight hours when there is no solar radiation. There is a problem that can not be.

  Furthermore, in this type of hot water storage type hot water supply device, heat storage operation is performed at midnight on the previous day so as to secure a hot water storage amount equivalent to the required heat amount for hot water supply to be used on the next day. When the irrigation water is heated, the heat storage operation is performed so that the amount of stored hot water corresponding to the amount of collected heat obtained by solar heat is not boiled in the midnight time zone, and then it is heated by solar heat in the daytime.

  However, the amount of heat collected varies because solar heat depends on the weather of the day. In other words, when the amount of stored hot water corresponding to the amount of heat collected is large, if there is no sunlight, such as cloudy weather or rain, the heat storage operation in the daytime with a high charge setting is necessary because the necessary amount of heat for hot water supply is insufficient. Conversely, when the amount of stored hot water corresponding to the amount of heat collected is small, solar heat cannot be used effectively if there is sufficient solar radiation.

  Accordingly, an object of the present invention is to take the above-described points into consideration, and is configured to provide hot water supply control means for performing hot water storage operation with a required boiling heat amount obtained by reducing the heat collection heat amount so that the hot water supply water can be heated with the heat collection heat amount. The purpose is to provide a hot water storage type hot water supply device that can save energy and low maintenance costs.

In order to achieve the above object, the technical means described in claims 1 to 8 are employed. That is, in the invention described in claim 1, the hot water storage tank (21) for storing hot water supply water, the heat source device (22) for performing the heat storage operation by circulating the hot water supply water in the hot water storage tank (21), and the use of hot water supply In a hot water storage type hot water supply apparatus provided with hot water supply control means (25) for controlling the heat source device (22) and performing a heat storage operation according to the required amount of heat for hot water supply to be provided,
A solar heating apparatus having a solar heat collector (11) for heating a heat collection medium with solar heat, and heating hot water in the hot water storage tank (21) with the heat collection medium heated by the solar heat collector (11) (10) is provided,
The hot water supply control means (25) needs to subtract the heat collection heat amount obtained by the solar heating device (10) from the necessary heat amount for hot water supply when performing a heat storage operation in a predetermined time zone the day before using the stored hot water supply water The heat storage operation is performed according to the amount of heating heat.

  According to the first aspect of the present invention, hot water supply is divided into the heat source device (22) that outputs the amount of heat required for heating the hot water supply water and the solar heating device (10) that outputs the amount of collected heat. Since the required heat quantity is obtained, the heat storage operation on the heat source device (22) side is shortened, so that energy saving and low maintenance cost can be achieved.

  In the invention according to claim 2, the hot water storage tank (21) is provided with a heat exchanger (12) for exchanging heat between the heat collecting medium heated by the solar heat collector (11) and hot water supply water, The solar heating device (10) is characterized in that the hot water supply water is heated by circulating the heat collection medium heated by the solar heat collector (11) through the heat exchanger (12).

  According to the invention described in claim 2, since hot water supply water is stored in this kind of 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, Hot water supply in a temperature layer in which the hot water temperature is relatively low by the amount of heat collected by the solar heat collector (11) by disposing a heat exchanger (12) in the vicinity of the boundary between the medium temperature hot water and the low temperature hot water Water can be heated.

  Moreover, since there is no hot water storage tank for storing the heat collection medium heated by the solar heat collector (11), the installation space can be reduced.

  The invention according to claim 3 is characterized in that the required amount of heating heat is obtained by subtracting the amount of residual heat and the amount of heat collected in the hot water storage tank (21) from at least the necessary amount of heat for hot water supply. According to the third aspect of the present invention, the minimum necessary heat storage operation is possible. Thereby, since the heat storage operation of the heat source device (22) is shortened, energy saving and low maintenance cost can be achieved.

  In the invention according to claim 4, the required amount of heat for hot water supply is obtained based on learning control for learning and storing the amount of hot water for hot water discharged from the hot water storage tank (21) within a predetermined period, and the amount of heat collected is The heat collection heat amount output to the hot water supply water from the heat exchanger (12) is obtained based on learning control for learning and storing within a predetermined period.

  According to the fourth aspect of the present invention, by obtaining the necessary amount of heat for hot water supply and the amount of heat collected from actual data for the last one week, for example, variations in the amount of heat can be reduced. Thereby, the heat storage driving | operation of the stable heat-source apparatus (22) can be performed.

  In the invention according to claim 5, the solar heating device (10) has a heat collecting heat quantity measuring means (12a, 12b, 12c) for measuring the heat collecting heat quantity output from the heat exchanger (12) to the hot water supply water. It is characterized by that. According to the fifth aspect of the present invention, the amount of heat collected can be easily measured based on the temperature and flow rate information of the heat collecting medium flowing through the heat exchanger (12).

  In the invention described in claim 6, the heat collection control means (15) for controlling the heating water by circulating the heat collection medium heated by the solar heat collector (11) in the heat exchanger (12). The heat collection control means (15) is provided with a heat collection heat quantity calculation means for obtaining the heat collection heat quantity based on at least the flow rate information and temperature information measured by the heat collection heat quantity measurement means (12a, 12b, 12c). It is characterized by being provided.

  According to the invention described in claim 6, when the hot water supply water is heated by the solar heating device (10), an accurate amount of collected heat can be obtained.

  In the invention according to claim 7, the hot water supply control means (25) is inputted by the weather prediction information input means (25b) at the date and time when the stored hot water supply water is used, and the weather prediction information input means (25b). Weather prediction information determination means for determining the weather prediction information, and the hot water supply control means (25) corrects the heat collection heat amount based on the weather prediction information determined by the weather prediction information determination means. Yes.

  According to the seventh aspect of the present invention, the amount of collected heat depends on the weather. Therefore, the amount of collected heat can be obtained with high accuracy by correcting the amount of collected heat based on the weather prediction information. Thereby, the fluctuation | variation of the excess and deficiency of required boiling-up heat quantity can be made small.

  The invention according to claim 8 is characterized in that the heat source device (22) is a heat pump cycle in which carbon dioxide is used as a refrigerant. According to the invention described in claim 8, since the heat source device (22) using carbon dioxide is a supercritical heat pump cycle, the hot water can be brought to a high temperature (for example, about 85 to 90 ° C.) and is well known. Therefore, the hot water storage tank (21) can be made smaller and more economical than a heat pump cycle using a refrigerant of CFC or alternative CFC.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic diagram showing an overall configuration of a hot water storage type hot water supply apparatus, and FIG. 2 is a flowchart showing a control process of a temperature-controlled hot water supply control program 25a of the hot water supply control apparatus 25.

  As shown in FIG. 1, the hot water storage type hot water supply apparatus of the present embodiment includes a solar heating apparatus 10 that heats hot water in a hot water storage tank 21 with a heat collection medium (for example, antifreeze) heated by solar heat, and a heat source apparatus. It comprises a heat pump water heater 20 that discharges hot water heated by a heat pump unit 22 comprising a heat pump cycle.

  The solar heating device 10 includes a 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 collection medium, and a heat collection medium heated by solar heat. It comprises a circulating water circuit 14 that forms a water circuit that circulates 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.

  The solar heat collector 11 has a water circuit that is heated by solar radiation inside, and is heated by circulating a heat collection medium sucked from the suction port 11a. A water temperature thermistor (not shown) for detecting the water temperature of the water circuit is provided, and the water temperature information 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 below the hot water storage tank 21 and is configured such that a heat collection medium circulates inside the tube. The circulating water circuit 14 is provided with a circulating pump 14a that pumps the heat collection medium, and is controlled by being electrically connected to a heat collection control device 15 described later.

  In this type of hot water storage tank 21, hot water supply water is stored 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, so that the heat exchanger 12 is connected to medium temperature hot water and low temperature hot water. When it is disposed at the boundary, 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, water temperature sensors 12a and 12b for detecting the inlet / outlet water temperature flowing through the heat exchanger 12, and a flow rate counter 12c for detecting the flow rate of the heat collection medium flowing through the heat exchanger 12, The temperature information detected by the water temperature sensors 12a and 12b and the flow rate information detected by the flow rate counter 12c are electrically connected so as to be output to the heat collection control device 15 described later. In addition, although mentioned later in detail, these water temperature sensors 12a and 12b and the flow rate counter 12c are the heat collecting calorific value measuring means referred to in the claims.

  The heat collection control device 15 which is a heat collection control means is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset heat collection control program 15a. The circulation pump 14a is configured to be controlled based on temperature information from the thermistor and water temperature sensors 12a and 12b, flow rate information from the flow rate counter 12c, operation signals from operation switches provided on an operation panel (not shown), and the like. .

  Next, the heat pump hot water supply device 20 includes a hot water storage tank 21 for storing hot water supply water, a heat pump cycle that circulates the hot water supply water in the hot water storage tank 21 and performs a boiling operation, and tap water sucked from the lower part of the hot water storage tank 21. Is circulated through the heat pump unit 22 to form a water circuit returning to the upper part of the hot water storage tank 21 and a hot water supply control device 25 as hot water supply control means.

  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. Moreover, 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 into the hot water storage tank 21 is connected to the introduction port 21a.

  At the upper end of the water supply pipe 13, there is provided a decompression check valve (not shown) that adjusts the water pressure of the introduced tap water to a predetermined pressure and prevents the back flow of hot water in the case of water interruption or the like. Further, the water supply pipe 13 is provided with a water supply thermistor 13a which is a temperature detecting means, and temperature information in the water supply pipe 13 is output to a hot water supply control device 25 which will be described later.

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

  In addition, reference numeral 27 shown in the figure denotes an intermediate temperature extraction pipe for taking out hot water for hot water having a lower temperature than hot water for hot water stored in the hot water storage tank 21. It is taken out from a substantially central part.

  Furthermore, 29 shown in the figure is a high / medium temperature mixing valve provided at the downstream junction of the high temperature take-out pipe 26 and the intermediate temperature take-out pipe 27, and the hot water temperature of the hot water flowing through the hot water supply pipe 28 on the downstream side. It is a temperature control valve that adjusts. That is, by adjusting the respective opening area ratios, the mixing ratio of the hot water supply water taken out from the high temperature take-out pipe 26 and the medium temperature hot water supply water taken out from the intermediate temperature take-out pipe 27 is adjusted.

  Incidentally, the high / medium temperature mixing valve 29 circulates 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 hot water supply pipe 28 is a hot water supply pipe whose downstream end communicates with a hot water tap (not shown) such as a kitchen or bathroom, and a hot water mixing valve 30, a hot water thermistor 28a, and a flow rate counter 28b are provided in the middle.

  The hot water supply thermistor 28a outputs temperature information in the hot water supply pipe 28, and the flow rate counter 28b outputs flow information in the hot water supply pipe 28 to the hot water supply control apparatus 25 described later. 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 mixing valve 30 performs feedback control based on the hot water temperature of the hot water detected by the hot water thermistor 28b. The high / medium temperature mixing valve 29 and the hot water supply mixing valve 30 are electrically connected to a hot water supply control device 25, which will be described later, and the temperature information detected by the water supply thermistor 13a, the hot water supply thermistor 28a, and each thermistor. Based on control.

  On the other hand, a suction port 21c for sucking tap water in the hot water storage tank 21 is provided in the vicinity of the introduction port 21a, and a discharge port 21d for discharging hot water into the hot water storage tank 21 is provided above the hot water storage tank 21. 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 heat source device.

  In addition, 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 tap water in the hot water storage tank 21 sucked from the suction port 21c is heat exchanged with the high-temperature refrigerant. The water for hot water supply in the hot water storage tank 21 can be boiled by heating by the above and returning it to the hot water storage tank 21 from the discharge port 21d.

  The heat pump unit 22 of the present embodiment is a supercritical heat pump composed of refrigerant functional parts that constitute a heat pump cycle such as a compressor, a condenser, 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 becomes equal to or higher than the critical pressure of the refrigerant. For example, the heat pump cycle uses carbon dioxide, ethylene, ethane, nitrogen oxide, or the like as a refrigerant.

  Incidentally, according to the supercritical heat pump, hot water can be boiled at a higher temperature (for example, about 85 ° C. to 90 ° C.) than a general heat pump cycle.

  The heat pump unit 22 is operated by a control signal from a hot water supply control device 25 described later, and outputs an operating state to the hot water supply control device 25. Furthermore, 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.

  A plurality of water level thermistors 24 are arranged on the outer wall surface of the hot water storage tank 21 at substantially equal intervals in the vertical direction, and a hot water supply control device which will be described later with temperature information at each water level filled in the hot water storage tank 21. 25 is output. 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 up in the hot water storage tank 21 and the water that has not been boiled down in 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 20, the high / medium temperature mixing valve 29, the hot water mixing valve 30 and the like are controlled.

  In addition, the hot water supply control device 25 is configured to be connected to the above-described heat collection control device 15 either by communication or electrically and input 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 25a for performing a boiling operation of hot water in the hot water storage tank 21 is provided. The heating operation is performed during a time period (for example, 10:00 PM to 7:00 of the next morning).

  In the boiling operation, when the midnight time zone is reached, the heat pump unit 22 is operated based on temperature information from each water level thermistor 24 and the temperature sensor to heat the tap water in the hot water storage tank 21 to a high temperature (for example, 85 ° C.). Water for hot water supply. Therefore, after the end of the midnight time zone (for example, 7:00 am), the amount of hot water stored in the hot water storage tank 21 is stored in accordance with the required amount of heat for hot water supply used in one day.

  However, when the hot water storage amount set in advance is used outside the above-mentioned midnight time zone, it is set so that the reheating operation is performed when the hot water storage amount is below a predetermined minimum hot water storage amount.

  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, at step 210, it is determined whether or not a predetermined time has come. For example, when the current time reaches 10:00 pm, the control process of the temperature-controlled hot water supply control program 25a is started.

  In step 220, the heat collection heat quantity SQ is read out of the temperature and water level information from each water level thermistor 24 and the heat collection information from the heat collection control device 15. 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 difference between the water temperature of the heat collection medium heated by solar heat and the hot water temperature in the vicinity of the heat exchanger 12 in the hot water storage tank 21 is equal to or higher than a predetermined temperature, the circulation pump 14a is activated and the solar heat collector 11 is operated. 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. When the temperature difference reaches a predetermined temperature or less, the circulation pump 14a is stopped and heating with the heat collecting medium is stopped.

  At this time, in the heat collection control device 15, the amount of heating per unit time output from the heat exchanger 12 is calculated based on the temperature and flow rate information detected by the water temperature sensors 12a and 12b and the flow rate counter 12c. It is obtained by the calculation means, accumulated, and learned and stored as the heat collection heat amount SQ per day.

  Then, at least the heat collection heat amount SQ per day for the past week is stored, and when the heat collection heat amount SQ is read in step 220, an average value is obtained based on the data for the past week. To be read.

  Next, in step 230, the required amount of heat Q2 for hot water supply is obtained. The required heat quantity Q2 for hot water supply is used to obtain the required heat quantity of the hot water supplied to the hot water used for the next day. In this embodiment, the heat quantity 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, hot water supply thermistor 28a, tapping temperature sensor 21e, flow rate counter 28b, etc., the hot water supply heat amount per unit time is obtained and accumulated to obtain the required hot water supply heat amount Q2 per day. It is learned and stored in the hot water supply control device 25.

  And at least the hot water required heat quantity Q2 per day for the past week is stored, and when the hot water required heat quantity Q2 is obtained in step 230, the average value is obtained based on the data for the past week. I am doing so.

  Next, in step 240, the residual heat amount Q1 is obtained. This remaining heat amount Q1 is the amount of hot water stored for the unused hot water stored the day before, for example, the amount of hot water at a predetermined temperature (for example, about 60 ° C.) or more is obtained. Based on temperature and water level information.

  Next, in step 250, the required amount of heating heat Q is obtained. In the present embodiment, this required boiling heat quantity Q is obtained from Q = hot water supply required heat quantity Q2-residual heat quantity Q1-heat collection heat quantity SQ. In other words, the boiling operation (step 260) is executed with the heat amount obtained by subtracting the heat collection heat amount SQ for heating the required boiling heat amount Q from the hot water supply required heat amount Q2 by the heat collection medium.

  As a result, the required amount of heating heat Q is reduced, so that the heat storage operation of the heat pump unit 22 is significantly shortened, so that energy saving and low maintenance costs can be achieved.

  When the temperature difference between the water temperature of the heat collection medium heated by solar heat the next day and the hot water temperature in the vicinity of the heat exchanger 12 in the hot water storage tank 21 is equal to or higher than a predetermined temperature, the circulation pump 14a is activated and the solar heat collection is performed. The heat collection medium heated by the vessel 11 is circulated to the heat exchanger 12. Thereby, the amount of stored hot water corresponding to the amount of collected heat SQ is heated by solar heat.

  In the present embodiment, the heat collection heat amount SQ 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, as shown in FIG. On the heat collection control device 15 side, the temperature and flow rate information detected by the water temperature sensors 12a and 12b and the flow rate counter 12c, which are heat collection heat quantity measurement means, are read as they are into the hot water supply control device 25 (see step 220). The heating amount per unit time may be obtained and accumulated based on the read temperature and flow rate information, and may be learned and stored as the collected heat amount SQ per day.

  And at the hot water supply control device 25 side, at least the past one week of collected heat amount SQ per day is stored, and in step 242, the average value may be obtained based on the past one week's data. .

  According to the hot water storage type hot water supply device according to the first embodiment described above, the hot water supply control device 25 performs the solar heat heating device from the necessary amount Q2 of hot water supply when performing a heat storage operation in a predetermined time zone the day before using the stored hot water supply water. The heat pump unit 22 that outputs the required amount of heating heat Q by performing a heat storage operation according to the required amount of heating heat Q that is obtained by reducing the amount of heat collected SQ obtained in Step 10 and the solar heating device 10 that outputs the amount of heat collected SQ Therefore, since the heat storage operation of the heat pump unit 22 is shortened, energy saving and low maintenance costs can be achieved.

  In addition, the solar heating device 10 is configured to circulate the heat collection medium heated by the solar heat collector 11 in the heat exchanger 12 to heat the hot water supply water in the hot water storage tank 21, so that this type of hot water storage is provided. In the tank 21, hot water supply water is stored in the order of high temperature hot water, medium temperature hot water, and low temperature hot water from the top to the bottom. For example, the heat exchanger 12 is located near the boundary between the medium temperature hot water and the low temperature hot water. Is provided, the hot water supply water in the temperature layer having a relatively low hot water temperature can be heated with the collected heat amount SQ collected by the solar heat collector 11.

  Moreover, since it is not necessary to provide the hot water storage tank for storing the heat collecting medium heated with the solar heat collector 11, the installation space can be made small.

  Further, the required boiling heat quantity Q is obtained by subtracting the residual heat quantity Q1 in the hot water storage tank 21 and the heat collection heat quantity SQ from at least the required hot water supply heat quantity Q2, so that the minimum necessary heat storage operation can be performed. Thereby, since the heat storage operation of the heat pump unit 22 is shortened, energy saving and low maintenance cost can be achieved.

  The required amount of heat Q2 for hot water supply is obtained based on learning control for learning and storing the amount of hot water for hot water discharged from the hot water storage tank 21 within a predetermined period, and the amount of collected heat SQ is calculated from the heat exchanger 12 By obtaining the heat collection heat amount SQ output to the water for use based on learning control for learning and storing within a predetermined period, for example, obtaining the necessary heat amount Q2 for hot water supply and the heat collection heat amount SQ from the actual data in the last week Thus, the variation in the variation of the heat quantity can be reduced. Thereby, the heat storage operation of the stable heat pump unit 22 can be performed.

  Further, the solar heating device 10 has water temperature sensors 12a and 12b and a flow rate counter 12c, which are heat collecting heat amount measuring means for measuring the heat collecting heat amount SQ output from the heat exchanger 12 to the hot water supply water. The amount of heat collected can be easily measured based on the temperature and flow rate information of the heat collection medium flowing through the heat exchanger 12.

  In addition, a heat collection control device 15 is provided for performing control for heating the hot water supply water by circulating the heat collection medium heated by the solar heat collector 11 in the heat exchanger 12, and this heat collection control device 15 is provided with at least the heat collection control device 15. A solar heat heating device is provided by providing heat collection calorific value calculation means for obtaining the heat collection heat quantity SQ based on the flow rate information and temperature information measured by the water temperature sensors 12a, 12b and the flow rate counter 12c, which are thermal calorie measurement means. When the hot water supply water is heated at 10, an accurate amount of heat collected can be obtained.

  Moreover, since the heat pump unit 22 is a heat pump cycle in which carbon dioxide is used as a refrigerant, the heat pump unit 22 using carbon dioxide is a supercritical heat pump cycle, so hot water is supplied at a high temperature (for example, about 85 to 90 ° C.). In addition, the hot water storage tank 21 can be made smaller and more economical than a heat pump cycle that uses a refrigerant of known chlorofluorocarbon or alternative chlorofluorocarbon.

(Second Embodiment)
In the above first embodiment, the amount of heat collected per unit time output from the heat exchanger 12 is collected based on the temperature and flow rate information detected by the water temperature sensors 12a, 12b and the flow rate counter 12c. It is obtained and accumulated by the heat calorific value calculating means, and is learned and stored as the heat collection heat amount SQ per day. At least the heat collection heat amount SQ per day for the past week is stored, and the hot water supply control device 25 When the amount of collected heat SQ is read, an average value is obtained based on data for the past week.

  However, the amount of heat collected SQ depends on the weather of the next day when the heat storage operation is performed. However, the present invention is not limited to this, and weather information is input to the heat collected heat amount SQ by the weather prediction means 25b to determine the weather information. The heat collection heat quantity SQ may be corrected based on the determined weather information.

  Specifically, as shown in FIG. 3 and FIG. 4, the weather prediction means 25 b composed of a decoder such as the Internet or FM multiplexing is used to acquire the next day's weather prediction information and input it to the hot water supply control device 25. . Then, in step 225 shown in FIG. 5, the weather prediction information input from the weather prediction means 25b is read, and in step 245, correction of the heat collection heat quantity SQ is obtained.

  For example, the determination and correction coefficient K is determined by setting the correction coefficient K = 1 when the weather forecast information is sunny, K = 0.5 when it is cloudy, and K = 0 when it is raining. Then, the required boiling heat quantity Q is corrected by multiplying the collected heat quantity SQ of the required boiling heat quantity Q in step 250a by a correction coefficient.

  According to this, since the heat collection heat amount SQ depends on the weather, the heat collection heat amount SQ with higher accuracy than the first embodiment can be obtained by correcting the heat collection heat amount SQ based on the weather prediction information. it can. Thereby, the fluctuation | variation of the excess and deficiency of the required boiling heat quantity Q can be made small.

(Other embodiments)
In the above embodiment, the heat pump unit 22 using carbon dioxide as a refrigerant has been described as a heat source device. However, the present invention is not limited to this, and a general heat pump cycle using a refrigerant such as chlorofluorocarbon or alternative chlorofluorocarbon may be used.

It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 1st Embodiment of this invention. It is a flowchart which shows the control processing of the temperature control hot water supply control program 25a in 1st Embodiment of this invention. It is a flowchart which shows the control processing of the temperature control hot water supply control program 25a in the modification of 1st Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 2nd Embodiment of this invention. It is a flowchart which shows the control processing of the temperature control hot water supply control program 25a in 1st Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Solar heating apparatus 11 ... Solar heat collector 12 ... Heat exchanger 12a, 12b ... Water temperature sensor (heat collecting calorie measuring means)
12c ... Flow rate counter (heat collecting calorie measuring means)
15 ... Heat collection control device (heat collection control means)
21 ... Hot water storage tank 22 ... Heat pump unit (heat source device)
25 ... Hot water supply control device (hot water supply control means)
25b ... Weather forecast information input means

Claims (8)

A hot water storage tank (21) for storing hot water supply water,
A heat source device (22) for performing a heat storage operation by circulating the hot water supply water in the hot water storage tank (21);
In a hot water storage type hot water supply apparatus provided with hot water supply control means (25) for controlling the heat source device (22) to perform a heat storage operation according to the required amount of heat for hot water supply for use in hot water supply,
Solar heating that has a solar heat collector (11) that heats the heat collection medium with solar heat, and that heats hot water in the hot water storage tank (21) with the heat collection medium heated by the solar heat collector (11) A device (10) is provided;
The hot water supply control means (25) subtracts the heat collection heat amount obtained by the solar heating device (10) from the necessary heat amount for hot water supply when performing a heat storage operation in a predetermined time zone on the day before using the stored hot water supply water. A hot water storage type hot water supply device that performs a heat storage operation according to the required amount of boiling heat. In the hot water storage tank (21), a heat exchanger (12) for exchanging heat between the heat collection medium heated by the solar heat collector (11) and hot water supply water is provided,
The solar heating device (10) is configured to heat the hot water supply water by circulating the heat collection medium heated by the solar heat collector (11) through the heat exchanger (12). The hot water storage type hot water supply apparatus according to claim 1.   The required boiling heat quantity is obtained by subtracting at least the required heat quantity for hot water supply from the residual heat quantity in the hot water storage tank (21) and the collected heat quantity obtained by the solar heating device (10). The hot water storage type hot water supply apparatus according to claim 1 or 2. The required amount of heat for hot water supply is obtained based on learning control for learning and storing the amount of discharged hot water for hot water discharged from the hot water storage tank (21) within a predetermined period,
The said heat collection heat amount is calculated | required based on the learning control which learns and memorize | stores the heat collection heat amount output to the water for hot water supply from the said heat exchanger (12) within a predetermined period. Hot water storage water heater.   The solar thermal heating device (10) includes heat collection calorie measuring means (12a, 12b, 12c) for measuring the heat collection calorie output from the heat exchanger (12) to hot water supply water. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4. The heat exchanger (12) is provided with heat collection control means (15) for performing control for circulating the heat collection medium heated by the solar heat collector (11) to heat the hot water supply water,
The heat collection control means (15) is provided with heat collection heat amount calculation means for obtaining heat collection heat quantity based on at least the flow rate information and temperature information measured by the heat collection heat quantity measurement means (12a, 12b, 12c). The hot water storage type hot water supply apparatus according to claim 5, wherein In the hot water supply control means (25), weather prediction information input means (25b) at the date and time when the stored hot water supply water is used, and weather for determining the weather prediction information input by the weather prediction information input means (25b) Prediction information determination means is provided,
The said hot water supply control means (25) correct | amends the said heat collection heat amount based on the weather prediction information determined by the said weather prediction information determination means, The Claim 1 thru | or 6 characterized by the above-mentioned. The hot water storage type hot water supply apparatus described.   The hot water storage type hot water supply device according to any one of claims 1 to 7, wherein the heat source device (22) is a heat pump cycle in which carbon dioxide is used as a refrigerant.

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