JP2019020018A - Calculation system - Google Patents

Abstract

To provide a calculation system capable of properly calculating a reduction amount of purchase energy and electricity and heating expenses which can be reduced by using a solar heat heating part in a hot water system capable of transferring hot water between households.SOLUTION: Each of a hot water supply facility on a parent household side and a hot water supply facility on a child household side includes: a solar heat collector for heating hot water in a hot water storage tank; a back-up heating part; and a hot water supply pipeline for supplying hot water stored in the hot water storage tank to a water discharge port of each household. The hot water supply facilities are connected with each other by a connection pipeline and hot water is transferrable between the households. An MPU 56 of a control device 55 determines a heat consumption amount in the parent household based on the information from sensor units 66, 67 attached to the discharge port of the parent household, specifies transfer heat amount to the child household based on the information from a sensor unit 82 provided at the connection pipeline, and calculates a reduction amount of electricity and heating expenses which can be reduced by supplying hot water heated in the solar heat collector based on the specified heat consumption amount and the transfer heat amount.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a calculation system.

  Some buildings such as houses are provided with a hot water supply system in which hot water heated by an outdoor hot water supply device or the like is supplied to a water outlet of a kitchen or a washroom through a pipe. As a hot water supply system, a solar hot water supply system having a solar heat collector that generates hot water by absorbing solar heat, which is a natural energy, is widespread, and consideration is given to environmental aspects. In the solar hot water system, for example, an event that sufficient hot water cannot be obtained when the amount of sunshine is insufficient may occur, and it is easily affected by the weather. Therefore, the convenience of the hot water supply system is reduced due to environmental considerations by supplementing the shortage of hot water by using a backup heating unit such as a gas water heater that consumes purchased energy such as gas to heat it. Measures have been taken to prevent such problems.

  In recent years, a technique has been proposed in which the amount of reduction in utility costs or the like that can be reduced by using solar heat is displayed on an information terminal of a building (see, for example, Patent Document 1), improving user satisfaction and environmental awareness. Consideration has been made.

JP 2011-220647 A

  In the hot water supply system described above, hot water (heat) is supplied from households that have a sufficient amount of hot water heated by a solar heat collector to households that have insufficient hot water, in order to reduce the total energy costs of multiple households. It can be considered flexible. In such a configuration, when calculating the reduction of utility costs in the household that is the source of accommodation, the reduction effect of the solar heat collector is more than the actual result because the amount of hot water to other households is not considered. Can be displayed small. This is not preferable because it becomes a factor that lowers the user's evaluation of the hot water supply system (particularly, the solar heat collector). As described above, in the configuration in which the utility cost is reduced by the interchange of hot water, there is room for improvement in the configuration relating to the calculation of the reduction amount in order to appropriately provide the user with the reduction amount of the utility cost and the like.

  The present invention has been made in view of the above circumstances, and appropriately calculates the amount of purchase energy and utility costs reduced by using a solar heating unit in a hot water supply system capable of accommodating hot water between households. The main purpose is to provide a calculation system capable of performing the above.

  Hereinafter, effective means for solving the above-described problems will be described while showing effects and the like as necessary.

Means 1. A solar heating unit that heats the supplied water by solar heat, a backup heating unit that consumes purchase energy to generate hot water, and a hot water supply pipe that supplies hot water from the solar heating unit and the backup heating unit to the water outlet A calculation system that is applied to a hot water supply system and that calculates a reduction amount of at least one of the purchase energy and the operating cost of the backup heating unit that are reduced with the use of hot water heated by the solar heating unit. ,
The hot water supply system can accommodate hot water heated by the solar heating unit from a predetermined household provided with the hot water supply system to another household,
A heat consumption specifying means for specifying the heat consumption based on the use of hot water in the predetermined household;
An accommodation heat amount specifying means for specifying an accommodation heat amount based on accommodation of hot water from the predetermined household to the other household;
A calculation comprising: a reduction amount calculation means for calculating the reduction amount based on the heat consumption amount calculated by the heat consumption amount specification means and the accommodation heat amount specified by the accommodation heat amount specification means system.

  According to the configuration in which hot water heated by the solar heating unit can be accommodated from a predetermined household to other households, it is possible to contribute to the reduction of utility costs in the entire household. With respect to the hot water supply system of a given household, the calculation system calculates the amount of purchase energy and the reduction of utility costs that can be reduced (saved) by using solar heat. In this means, the above calculation is performed based on the amount of heat consumed in a given household and the amount of heat exchanged with other households, so the purchase energy and utility costs reduced by using the solar heating unit can be reduced. The amount of reduction can be calculated appropriately.

  For example, if it is set as the structure which alert | reports the calculation result to a user, it can clarify how much the benefit of a solar heating part is. As described above, taking into account the amount of heat exchanged with other households, suppressing the deviation from the benefits of the solar heating unit suppresses the user's underestimation of the solar heating unit and promotes the use of the hot water interchange function. Preferred above.

  Note that the “calculation system” shown in this means may be configured to include at least a control device capable of calculating the reduction amount.

  Incidentally, “use of hot water in the predetermined household” shown in this means may be “supply of hot water to the outlet of the predetermined household”. Further, the present invention includes a reduction amount calculation unit that calculates the reduction amount based on the heat consumption amount calculated by the heat consumption amount specifying unit and the accommodation heat amount specified by the accommodation heat amount specification unit. Is calculated as a self-sufficiency ratio based on the amount of heat applied by the solar heating unit and the amount of heat applied by the backup heating unit. Self-sufficiency rate calculation means, and reduction amount calculation means for calculating the reduction amount by multiplying the sum of the consumed heat amount and the interchangeable heat amount by the self-sufficiency rate calculated by the self-sufficiency rate calculation means. '' It is also possible to do.

Mean 2. The predetermined household and the other household can exchange hot water between the households,
The accommodation heat quantity specifying means is a first accommodation heat quantity specifying means for specifying a first accommodation heat quantity that is the accommodation heat quantity,
A second accommodation heat amount specifying means for specifying a second accommodation heat amount based on accommodation of hot water from the other household to the predetermined household;
The reduction amount calculation means is specified by the heat consumption amount specified by the heat consumption amount specification means, the first accommodation heat amount specified by the first accommodation heat amount specification means, and the second accommodation heat amount specification means. The calculation system according to claim 1, wherein the reduction amount is calculated based on the second heat capacity.

  According to the means 2, by calculating not only the amount of heat exchanged from a given household to other households but also the amount of heat exchanged from other households to a given household, the amount of reduction in utility costs, etc. The certainty can be improved.

Means 3. The hot water supply system has a hot water storage tank that stores the water heated by the solar heating unit as hot water, and the hot water storage type backup heating that can store a set amount of hot water in the hot water storage tank in advance as the backup heating unit Have
The second interchangeable heat amount calculated by the second interchangeable heat amount specifying means, the amount of heat applied by the solar heating unit of the predetermined household, and the amount of heat applied by the backup heating unit of the predetermined household Based on the self-sufficiency rate calculating means for calculating a self-sufficiency rate as a ratio of the amount of heat provided for the generation of hot water in the predetermined household,
The reduction amount calculating means is calculated by the self-sufficiency rate calculating means as a sum of the consumed heat amount specified by the consumed heat amount specifying means and the first interchanged heat amount specified by the first interchangeable heat amount specifying means. The calculation system according to claim 2, wherein the reduction amount is calculated by multiplying a self-sufficiency rate.

  If you have a hot water storage type backup heating unit that can store hot water in advance, distinguish the hot water in the hot water storage tank into one generated by the backup heating unit and one generated by the solar heating unit. It becomes difficult. Therefore, as shown in this means, the self-sufficiency rate may be calculated based on the amount of heat applied by the solar heating unit and the amount of heat applied by the backup heating unit. Thus, the reduction amount can be easily calculated by multiplying the calculated self-sufficiency rate by the sum of the heat consumption amount and the interchangeable heat amount.

  Further, in a configuration in which hot water is interchanged between households, the actual self-sufficiency rate may change depending on the second interchangeable heat amount interchanged from other households to a predetermined household. Therefore, as shown in this means, if the self-sufficiency rate is calculated in consideration of the second interchangeable heat amount, the accuracy of the calculation result when the reduction amount is calculated using the self-sufficiency rate can be improved. it can.

Means 4. The connecting pipe formed to connect the predetermined household and the other household and allow hot water to pass therethrough is provided with a detection unit for detecting the amount and temperature of hot water passing through the connecting pipe. ,
The first interchangeable heat amount specifying means specifies the first interchangeable heat amount based on detection information from the detection unit when hot water is interchanged from the predetermined household to the other household through the connection pipe. And
The second interchangeable heat amount identifying means identifies the second interchangeable heat amount based on detection information from the detection unit when hot water is interchanged from the other household to the predetermined household through the connection pipe. The calculation system according to means 2 or 3, characterized by:

  According to the means 4, when the hot water is accommodated, each interchangeable heat quantity can be calculated in accordance with the actual accommodation situation. Thereby, the calculation accuracy of the reduction amount etc. mentioned above can be improved.

Means 5. The detection unit includes a first detection unit provided in a portion of the connecting pipe that is on the other household side, and a second detection unit provided in a portion of the connection pipe that is on the predetermined household side. And
The first interchangeable heat amount specifying means specifies the first interchangeable heat amount based on detection information from the first detection unit,
The calculation system according to claim 4, wherein the second interchangeable heat amount specifying means specifies the second interchangeable heat amount based on detection information from the second detection unit.

  When it is set as the structure which connects between households with a connecting pipe, the passage route through which hot water passes at the time of accommodation tends to become long. Under such circumstances, when hot water is accommodated, there may be a difference (heat loss) in hot water temperature (amount of heat) between the hot water supply source and the hot water supply destination. Therefore, as shown in this means, a first detection unit for specifying the first heat of accommodation is provided in a portion of the connecting pipe on the other household side, and a second portion of the connecting pipe on the predetermined household side is provided. By disposing the second detection unit for specifying the amount of heat to be accommodated, it is possible to suppress a reduction in the calculation accuracy of the reduction amount due to the difference.

Means 6. The hot water supply system has a hot water storage tank that stores the water heated by the solar heating unit as hot water, and the hot water storage type backup heating that can store a set amount of hot water in the hot water storage tank in advance as the backup heating unit Have
The reduction amount calculating means calculates the reduction amount in consideration of the carry-over heat amount of the hot water when at least a part of the hot water stored in the hot water storage tank is hot water carried over from the previous day. The calculation system according to any one of means 1 to means 5.

  As shown in the means 6, in the case of having a hot water storage type backup heating unit capable of storing hot water in advance, at least a part of the hot water carried over from the previous day (carrying heat amount) has previously been a backup heating unit. It may have been heated by. When the reduction amount is calculated without taking such carry-over heat amount into consideration, the calculation result can be smaller than the actual reduction amount. Therefore, as shown in the present means, by calculating the reduction amount in consideration of the amount of heat carried over, the certainty of the calculation result can be preferably improved.

Mean 7 The predetermined household and the other household can exchange hot water between the households,
The accommodation heat quantity specifying means is a first accommodation heat quantity specifying means for specifying a first accommodation heat quantity that is the accommodation heat quantity,
Second accommodation heat amount specifying means for specifying a second accommodation heat amount based on accommodation of hot water from the other household to the predetermined household;
First heating amount specifying means for specifying the amount of heat applied by the solar heating unit;
A second heating amount specifying means for specifying the amount of heat applied by the backup heating unit;
In the predetermined household, the total amount of heat specified by the first heating amount specifying means and the second heating amount specifying means and the second amount of heat specified by the second accommodation heat amount specifying means are added together. A total supply heat amount calculating means for calculating a total supply heat amount;
Subtracting the consumed heat amount specified by the consumed heat amount specifying unit and the first interchanged heat amount specified by the first interchanged heat amount specifying unit from the total supplied heat amount calculated by the total supplied heat amount calculating unit. The calculation system according to claim 6, further comprising a carry heat amount calculation means for calculating the carry heat amount.

  In a configuration in which hot water is interchanged between households, by calculating the carry-over heat amount taking into account the amount of heat exchanged between households, the calculation result of the carry-over heat amount, and hence the calculation result by the reduction amount calculation means, can be confirmed. It is possible to improve the appearance.

Means 8. A correction coefficient corresponding to heat loss that occurs with time in the hot water storage tank of the predetermined household is set,
The calculation system according to claim 6 or 7, wherein the reduction amount calculation means includes correction means for correcting the carry-over heat amount using the correction coefficient.

  In a configuration in which hot water can be carried over, the amount of heat is lost with the passage of time from the stored hot water. Therefore, if the configuration is such that the amount of carry-over heat is reflected in the reduction amount in consideration of such heat loss, the certainty of the calculation result described above can be preferably improved.

  Means 9. 9. The calculation system according to claim 1, further comprising a display terminal capable of displaying the reduction amount calculated by the reduction amount calculation unit.

  By displaying the reduction amount on the display terminal, it is possible to clarify how much the benefit of the solar heating unit is. As shown in the means 1, the amount of reduction is calculated based on the amount of heat consumed in a predetermined household and the amount of heat interchanged with other households. Suppressing divergence from the record of benefits from the solar heating unit, taking into account the amount of heat that can be transferred to other households, suppresses underestimation of the user's solar heating unit by looking at the information from the display terminal, and the hot water interchange function It is preferable for promoting the use of

  In view of providing information on the reduction amount to the user through the display terminal, the “calculation system” may be a “reduction amount display system” or an “information provision system”.

Schematic which shows the hot water supply system in one embodiment. Schematic comparing each household. Schematic which shows the electrical structure of a hot-water supply system. The flowchart which shows the 1st accommodation process. The flowchart which shows a 2nd accommodation process. Schematic which shows the mode of interchange of hot water. The block diagram which shows the structure which concerns on calculation of reduction amount. Schematic which shows the information group memorize | stored in RAM of a control apparatus. The flowchart which shows the reduction amount calculation process performed in MPU of a control apparatus. Schematic which shows a display terminal. It is the schematic which contrasted the calculation result when not considering the amount of heat of accommodation, and the calculation result when not considering the amount of heat of accommodation.

  Hereinafter, an embodiment of the present invention will be described. In the present embodiment, the present invention is applied to a hot water supply system for a building such as a house, and a calculation system for calculating a reduction amount of the utility cost that can be reduced in the hot water supply system by heating the hot water with solar heat is embodied. First, a hot water supply system will be described with reference to the schematic diagram of FIG.

  The building 10 has a two-story structure, and is distinguished so that the first floor of the building is a hierarchy for a parent household and the second floor of the building is a hierarchy for a child household. Specifically, it is a so-called completely separate type two-family house in which each floor (each household) is provided with a bath, toilet, kitchen and the like.

  The hot water supply system 50 is provided on the parent household side hot water supply facility 51 for supplying hot water to the water outlets of the bath unit 21, shower facility 22, wash basin 23, kitchen facility 24 provided on the parent household side, and on the child household side. A bath unit 31, a shower facility 32, a wash basin 33, and a child household hot water supply facility 52 for supplying hot water to the water outlets of the kitchen facility 34 are provided, and a hot water supply facility is provided for each household.

  The hot water supply facility 51 on the parent household side uses a hot water storage tank 60, a solar heat collector 61 that heats the water in the hot water storage tank 60 by solar heat, an electric water heater 62 for backup, and hot water stored in the hot water storage tank 60. A first hot water pipe 64 that leads to the water outlet of the unit 21, and a second hot water pipe that guides the hot water stored in the hot water storage tank 60 to the water outlet of the shower facility 22, the water outlet of the wash basin 23, and the water outlet of the kitchen facility 24. 65. In addition, sensor units 66 and 67 each having a temperature sensor, a flow rate sensor, and an operation detection sensor are provided for each water outlet, and the usage status of hot water at each water outlet can be monitored.

  The sub-household-side hot water supply facility 52 includes a hot water storage tank 70, a solar heat collector 71 that heats the water in the hot water storage tank 70 by solar heat, a backup gas water heater 72, a hot water storage tank 70, and a gas water heater 72. The mixing unit 73 that can mix hot water and water when the hot water stored in the hot water storage tank 70 is sent to the gas water heater 72 and the hot water stored in the hot water storage tank 70 are guided to the water outlet of the bus unit 31. A first hot water supply pipe 74 and a second hot water supply pipe 75 that guides hot water stored in the hot water storage tank 70 to the water outlet of the shower facility 32, the water outlet of the wash basin 33, and the water outlet of the kitchen facility 34 are provided. In addition, sensor units 76 and 77 each having a temperature sensor, a flow rate sensor, and an operation detection sensor are provided for each water outlet, and the use status of hot water at each water outlet can be monitored.

  The main household-side hot water supply facility 51 and the child household-side hot water supply facility 52 have the same main configuration, but the configuration is partially different in that the capacity of the hot water storage tanks 60 and 70 and the type of the heating unit for backup are different. doing. Hereinafter, the differences between the hot water supply facilities 51 and 52 will be described with reference to the schematic diagram of FIG. 2.

  The backup heating unit provided in the parent household is composed of a heat pump type electric water heater 62. About the heat pump type electric water heater 62, the hot water or water stored in the hot water storage tank 60 is heated so that the temperature and amount thereof are set to a preset temperature and preset amount. That is, even when the water in the hot water storage tank 60 is warmed by solar heat, if the temperature or amount thereof is less than the set amount, the hot water in the hot water storage tank 60 is discharged by operating the electric water heater 62. It will be heated.

  Here, the heat pump type electric water heater 62 is less responsive during heating than a gas water heater or the like due to its characteristics. On the other hand, the consumption of energy (electricity) when producing hot water is small, and it is excellent in terms of environment and economy. For example, by heating the hot water in the hot water storage tank 60 at night when the electricity rate is relatively low, the utility cost (hot water supply cost) can be suitably reduced as compared with a gas water heater. In addition, by preparing the hot water before the hot water is actually used, it is possible to suppress the deterioration of the usability of the hot water due to the responsiveness described above.

  The backup heating unit provided in the child household is constituted by a gas water heater 72. About the gas water heater 72, the hot water or water which goes to the spout from the hot water storage tank 70 is heated so that it may become a user's required temperature. For example, even when the water in the hot water storage tank 70 is warmed by solar heat, it operates when the temperature is less than the user's required temperature. The gas water heater 72 has higher responsiveness than the electric water heater due to its characteristics. Therefore, even if there is a sudden demand for a lot of hot water, it is possible to quickly respond to the demand.

  In the present embodiment, a couple is assumed as the family composition of the parent household, and a couple and a child are assumed as the family composition of the child household. Because there are more child households than the parent households, it is assumed that the variation in the amount of hot water used is also larger than that of the parent households. Therefore, by applying the gas water heater 72, consideration is given to improving user convenience. On the other hand, since the number of parent households is relatively small, the variation in the amount of hot water used is assumed to be smaller than that of the child households. As described above, by applying the heat pump type electric water heater 62 to the household on the side where the amount of hot water used is small, it is possible to reduce the number of buffers and increase the economic benefits.

  As described above, the solar heat collectors 61 and 71 are mainly used, and the solar heat collectors 61 and 71 are used alone by using a backup heating unit such as the electric water heater 62 and the gas water heater 72 together. In comparison, the convenience of hot water can be greatly improved. However, if the backup heating unit is excessively operated, there is a concern that the original purpose of enjoying the environmental and economic benefits using natural energy will not be achieved successfully. In the present embodiment, in view of such circumstances, one of the features is that a device for improving the energy efficiency of the hot water supply system 50 as a whole has been devised. Hereinafter, the configuration according to the device will be described with reference to the schematic diagram of FIG. 3.

  The building 10 is provided with a connecting pipe 80 so as to connect the hot water supply facilities 51 and 52 of both households. Specifically, the communication pipe 80 includes an intermediate portion (a portion between the hot water storage tank 60 and the water discharge port) of the second hot water supply pipe 65 in the parent household and an intermediate portion (the hot water storage) of the second hot water supply pipe 75 in the child household. It is connected to the tank 70 and a portion between the water outlet, and hot water can be moved between the hot water supply facilities 51 and 52 (between households).

  The connecting pipe 80 is provided with an electric valve 81 that can be switched between a closed state that prevents movement of hot water through the connecting pipe 80 and an open state that allows movement of hot water. The electric valve 81 is connected to a control device 55 that constitutes the hot water supply system 50, and is configured to switch between a closed state and an open state based on a drive signal from the control device 55.

  Further, in the second hot water supply pipe 65 of the parent household, a portion between the connecting portion of the connection pipe 80 and the hot water storage tank 60 is allowed to pass through the closed state and the hot water passing through the second hot water supply pipe 65. An electric valve 68 that can be switched to an open state is provided, and a second hot water supply is provided in a portion between the connecting portion of the connection pipe 80 and the gas water heater 72 in the second hot water supply pipe 75 of the child household. An electric valve 78 that can be switched between a closed state that prevents passage of hot water in the pipe 75 and an open state that allows passage of hot water is provided. The motor-operated valves 68 and 78 are connected to the control device 55 and are configured to be switched to a closed state / open state based on a drive signal from the control device 55.

  The sensor units 66 and 76 are connected to the input side of the control device 55, and the control device 55 grasps the hot water usage status at each outlet based on the detection information from the sensor units 66 and 76. Further, on the input side of the control device 55, a sensor unit 85 disposed in a portion between the electric hot water 68 and the hot water storage tank 60 in the second hot water supply pipe 65, and an electric valve 78 in the second hot water supply pipe 75. And the sensor unit 86 arrange | positioned by the part between gas water heaters 72 is connected. The sensor units 85 and 86 include a temperature sensor and a flow rate sensor, and the control device 55 can monitor the hot water supply status from the hot water supply facilities 51 and 52 based on the detection information from the sensor units 85 and 86. It has become. Further, sensor units 69 and 79 (temperature sensor and hot water amount sensor) attached to the hot water storage tanks 60 and 70 are connected to the input side of the control device 55. The controller 55 grasps the temperature and amount of hot water stored in the hot water storage tanks 60 and 70 based on the detection information from the sensor units 69 and 79. In the present embodiment, the controller 55, the communication pipe 80, the motor operated valves 68, 78, 81, the sensor units 66, 76, 69, 79 and the sensor units 82, 83 described later constitute a hot water interchange means. .

  Normally, the motor-operated valve 81 is closed, and movement of hot water between households is restricted. Here, when the hot water is insufficient in one household and the hot water is surplus in the other household, the motorized valve 81 is switched to the open state and the household pipe is connected through the connection pipe 80. Hot water can be accommodated. Hereinafter, with reference to the flowcharts of FIG. 4 and FIG. 5, a process related to the accommodation of hot water (a process for accommodation) executed by the control device 55 will be described. The accommodation process is a process that is executed periodically, and the first accommodation process (Fig. 4) relating to the accommodation of hot water from the parent household to the child household and the second relating to the accommodation of hot water from the child household to the parent household. It is comprised by the accommodation process (FIG. 5).

  In the first accommodation process, it is first determined in step S101 whether hot water is being exchanged from the child household to the parent household. If an affirmative determination is made in step S101, the first accommodation process is terminated as it is. If a negative determination is made in step S101, the process proceeds to step S102 to determine whether hot water is being passed from the parent household to the child household. If a negative determination is made in step S102, the process proceeds to step S103. In step S103, based on the detection information acquired from the sensor unit 76 (operation detection sensor) attached to the water outlet, it is determined whether or not it is the timing when the use of hot water is started in the child household.

  When an affirmative determination is made in step S103, a user's requested temperature confirmation process is performed in step S104. Specifically, the temperature (required temperature) of hot water that the user intends to use is confirmed based on detection information from the sensor unit 76 (operation detection sensor). On the other hand, if a negative determination is made in step S103, the process proceeds to step S105. In step S105, it is determined whether hot water is being supplied from the hot water storage tank 70 of the child household to the water outlet of the child household. If a negative determination is made in step S105, the first interchange process is terminated as it is.

  When an affirmative determination is made in step S105 or after confirmation processing is executed in step S104, the process proceeds to step S106. In step S <b> 106, it is determined whether or not hot water of a required temperature or higher is secured in the hot water storage tank 70 of the child household. That is, it is determined whether or not hot water is insufficient. If it is determined in step S106 that hot water is secured, the processing for this accommodation is terminated as it is. In this case, the electric valve 78 is switched from the closed state to the open state, and hot water stored in the hot water storage tank 70 is supplied to the water outlet.

  If a negative determination is made in step S106, the process proceeds to step S107. In step S107, it is determined whether or not there is hot water (surplus hot water) that can be accommodated in the hot water storage tank 60 of the parent household. Specifically, based on past usage of hot water in the parent household, the predicted usage of hot water in the parent household is calculated and set, and whether hot water exceeding the predicted usage is secured in the hot water storage tank 60. Determine whether.

  If a negative determination is made in step S107, the first interchange process is terminated as it is. If there is a shortage of hot water in the child household and there is no surplus in the parent household, the operation of the gas water heater 72 in the child household is started. Thereby, the hot water heated by the gas water heater 72 is supplied to the water outlet of the child household. In this case, the electric valve 78 of the child household is switched from the closed state to the open state, while the electric valve 81 attached to the connection pipe 80 is maintained in the closed state.

  If an affirmative determination is made in step S107, that is, if there is surplus hot water in the parent household, the process proceeds to step S108, and accommodation start processing is performed. In the accommodation start processing, the electric valve 68 of the parent household is switched from the closed state to the open state, and the electric valve 81 attached to the communication pipe 80 is switched from the closed state to the open state. Moreover, when the motorized valve 78 of the child household is in the open state, the motorized valve 78 is switched to the closed state. Thereby, the supply of hot water from the hot water storage tank 70 of the child household to the water outlet is regulated, and the supply of hot water from the hot water storage tank 60 of the parent household to the water outlet is started.

  Here, the flow of hot water accommodation will be illustrated with reference to the schematic diagram of FIG. As shown in FIG. 6 (a1), when a hot water supply operation is performed by the user at the water outlet on the child household side, whether or not hot water at the required temperature (for example, 40 ° C.) is accumulated in the hot water storage tank 70 of the child household. Confirm. If hot water is not accumulated, the temperature and amount of hot water stored in the hot water storage tank 60 of the parent household are checked to identify whether there is excess hot water in the parent household.

  When there is a shortage of hot water in the child household and there is excess hot water in the parent household, as shown in FIG. 6 (a1) → FIG. 6 (a2), the electric valve 68 and the electric valve 81 are switched to the open state. As a result, hot water will be interchanged from the parent household to the child household. Such interchange of hot water is one of the conditions when the use of hot water is completed in the child household, when the remaining hot water in the parent household is used up, or when the use of hot water is started in the parent household. The process ends when is established. When the use of hot water is continued in the child household, the supply source is switched from the parent household to the child household, and the operation of the gas water heater 72 as the backup heating unit is started.

  In addition, as shown in FIG. 6 (b1), when hot water stored in the hot water storage tank 70 of the child household is supplied to the water outlet of the child household, the motor operated valve 78 is opened, and the motor operated valves 68 and 81 are operated. Is closed. Here, when hot water is used, the amount of hot water in the hot water storage tank 70 is reduced, and hot water to be supplied to the water outlet cannot be secured. In this way, when there is a shortage of hot water, check the temperature and amount of hot water stored in the hot water storage tank 60 of the parent household, and identify whether there is excess hot water in the parent household To do.

  When there is not enough hot water in the child household and there is remaining hot water in the parent household, as shown in FIG. 6 (b1) → FIG. The valve 78 is switched to the closed state. Thereby, hot water is interchanged from the parent household to the child household. Such interchange of hot water is one of the conditions when the use of hot water is completed in the child household, when the remaining hot water in the parent household is used up, or when the use of hot water is started in the parent household. The process ends when is established. When the use of hot water is continued in the child household, the supply source is switched from the parent household to the child household, and the operation of the gas water heater 72 as the backup heating unit is started.

  Returning to the description of the first accommodation process shown in FIG. 4, after the accommodation start process is performed in step S108, the accommodation amount storage start process is executed in step S109, and then the first accommodation process is terminated. . A sensor unit 83 including a temperature sensor and a flow rate sensor is disposed in the communication pipe 80, and the sensor unit 83 is connected to the control device 55 (see FIG. 3). Based on the information from the sensor unit 83, the accommodation amount of the hot water (acoustic heat amount) accommodated in the child household until the accommodation amount storage end process described later is executed by executing the accommodation amount storage start process. The specified amount of accommodation is stored in the RAM of the control device 55.

  Returning to the description of step S102, if an affirmative determination is made in step S102, that is, if it is determined that hot water is being accommodated from the parent household to the child household, the process proceeds to step S110. In step S110, it is determined whether or not the temperature requested by the user has been changed. If a positive determination is made in step S110, the process proceeds to step S111. In step S111, a temperature condition reconfirmation process is performed. Specifically, it is confirmed whether or not the temperature of the hot water stored in the hot water storage tank 70 of the child household is higher than the changed required temperature.

  After performing the confirmation process of step S111, or when a negative determination is made in step S110, the process proceeds to step S112. In step S112, the reconfirmation process for the surplus in the parent household is performed. Specifically, it is confirmed whether or not there is a surplus of hot water stored in the hot water storage tank 60 of the parent household.

  After performing the confirmation process in step S112, the process proceeds to step S113. In step S113, it is determined whether or not the accommodation end condition is satisfied. Specifically, when the use of hot water at the spout of the child household has been completed, or when the surplus of hot water in the parent household has been used up, the hot water stored in the hot water storage tank 70 of the child household can satisfy the user's request. When it becomes possible to deal with it, an accommodation termination condition is established. It should be noted that it is sufficient if at least the use of hot water in the child household is completed, so that accommodation is completed, and it is arbitrary whether other conditions are set as the termination conditions.

  If the accommodation termination condition is satisfied, accommodation termination processing is executed in step S114. Thereby, at least the motor-operated valve 81 is switched from the open state to the closed state, and the interchange of hot water from the parent household to the child household ends. For example, in a situation where hot water is interchanged from the parent household to the child household, the motorized valves 68 and 81 are open, and the motorized valve 78 is closed. Due to continued interchange of hot water from the parent household, the amount of hot water stored in the hot water storage tank 60 of the parent household decreases, and the amount of hot water stored in the hot water storage tank 60 of the parent household reaches the assumed usage and surplus When there is no more space, the interchange of hot water from the parent household to the child household ends. Specifically, the motor-operated valves 68 and 81 are switched from the open state to the closed state, and the motor-operated valve 78 that has been in the closed state is switched to the open state. At the same time, the gas water heater 72 of the child household starts operation, and the hot water heated by the gas water heater 72 is supplied to the water outlet of the child household.

  Returning to the description of FIG. 4, after executing the termination process of step S <b> 114, after executing the accommodation amount storage termination process in step S <b> 115, the first accommodation process is terminated.

  Next, the second accommodation process will be described with reference to FIG. Note that the basic flow of the second accommodation process is the same as that of the first accommodation process.

  In the second accommodation process, first, in step S201, it is determined whether hot water is being exchanged from the parent household to the child household. If the child household is not being accommodated, the first accommodation process is terminated. When it is accommodating, it progresses to step S202 and it is determined whether it is in the middle of accumulating hot water from a child household to a parent household. When a negative determination is made in step S202, the process proceeds to step S203, in which the use of hot water is started in the parent household based on the detection information acquired from the sensor unit 66 (operation detection sensor) attached to the water outlet. It is determined whether or not.

  If an affirmative determination is made in step S203, a required temperature confirmation process is performed in step S204. On the other hand, if a negative determination is made in step S203, the process proceeds to step S205 to determine whether hot water is being supplied from the hot water storage tank 60 of the parent household to the water outlet of the parent household. If a negative determination is made in step S205, the second interchange processing is terminated as it is.

  When an affirmative determination is made in step S205 or after confirmation processing is executed in step S204, the process proceeds to step S206. In step S <b> 206, it is determined whether or not hot water having a required temperature or higher is secured in the hot water storage tank 60 of the parent household. If it is determined in step S206 that hot water has been secured, the processing for this accommodation is terminated as it is. In this case, the electric valve 68 is switched from the closed state to the open state, and hot water stored in the hot water storage tank 60 is supplied to the water outlet.

  If a negative determination is made in step S206, the process proceeds to step S207. In step S207, it is determined whether or not there is hot water (surplus hot water) that can be accommodated in the parent household in the hot water storage tank 70 of the child household. Specifically, whether or not the predicted hot water usage in the child household has been calculated and set based on the past usage of hot water in the child household, and whether or not the hot water exceeding the predicted usage has been secured in the hot water storage tank 70 Determine.

  If there is no surplus hot water in the child household, a negative determination is made in step S207, and the second accommodation process is terminated. When hot water is insufficient in the parent household and there is no surplus in the child household, the operation of the electric water heater 62 of the parent household is started. Thereby, the hot water heated by the electric water heater 62 is supplied to the spout of the parent household. In this case, the electric valve 68 of the parent household is switched from the closed state to the open state, while the electric valve 81 attached to the communication pipe 80 is maintained in the closed state.

  If there is surplus hot water in the child household, an affirmative determination is made in step S207, and the flow proceeds to step S208 to perform accommodation start processing. In the accommodation start processing, the electric valve 78 of the child household is switched from the closed state to the open state, and the electric valve 78 attached to the communication pipe 80 is switched from the closed state to the open state. Further, when the motorized valve 68 of the parent household is open, the motorized valve 68 is switched to the closed state. Thereby, the supply of hot water from the hot water storage tank 60 of the parent household to the water outlet is regulated, and the supply of hot water from the hot water storage tank 70 of the child household to the water outlet is started.

  After the accommodation start process is performed in step S208, the accommodation amount storage start process is executed in step S209, and then the second accommodation process is terminated. A sensor unit 82 including a temperature sensor and a flow rate sensor is disposed in the communication pipe 80, and the sensor unit 82 is connected to the control device 55 (see FIG. 3). Based on the information from the sensor unit 82, the accommodation amount of the hot water (acoustic heat amount) accommodated in the parent household until the accommodation amount storage end process described later is executed by executing the accommodation amount storage start process. The specified amount of accommodation is stored in the RAM of the control device 55.

  Returning to the description of step S202, if an affirmative determination is made in step S202, that is, if it is determined that hot water is being accommodated from the child household to the parent household, the process proceeds to step S210. In step S210, it is determined whether the temperature requested by the user has been changed. If a positive determination is made in step S210, the process proceeds to step S211. In step S211, a temperature condition reconfirmation process is performed. Specifically, it is confirmed whether or not the temperature of the hot water stored in the hot water storage tank 60 of the parent household is higher than the changed required temperature.

  After performing the confirmation process of step S211, or when a negative determination is made in step S210, the process proceeds to step S212. In step S212, the reconfirmation process for the surplus in the child household is performed. Specifically, it is confirmed whether or not there is a surplus of hot water stored in the hot water storage tank 70 of the child household.

  After executing the confirmation processing in step S212, the process proceeds to step S213. In step S213, it is determined whether or not the accommodation end condition is satisfied. Specifically, when the use of hot water at the spout of the parent household has been completed, or when the surplus of hot water in the child household has been used up, the hot water stored in the hot water storage tank 60 of the parent household can satisfy the user's request. When it becomes possible to deal with it, an accommodation termination condition is established. It should be noted that it is sufficient that the accommodation is completed at least when the use of hot water in the parent household is completed, and whether other conditions are set as the termination conditions is arbitrary.

  If the accommodation termination condition is satisfied, accommodation termination processing is executed in step S214. Thereby, at least the motor-operated valve 81 is switched from the open state to the closed state, and the interchange of hot water from the child household to the parent household is completed. After executing the termination process of step S214, after executing the accommodation amount storage termination process in step S215, the second accommodation process is terminated.

  The hot water supply system 50 described in detail above is applied with a calculation system for calculating the utility cost (corresponding to “reduction amount”) that can be reduced by using solar heat, and the calculation result by this calculation system is provided to the user. It has a configuration. Hereinafter, with reference to FIGS. 1, 7, and 8, a supplementary description will be given of the electrical configuration according to the calculation system. FIG. 7 is a block diagram showing an electrical configuration relating to the calculation system, and FIG. 8 is a schematic diagram showing a group of information stored in the RAM of the control device 55.

  As shown in FIG. 7, the sensor unit 66, 67 attached to each water outlet on the parent household side is connected to the control device 55. The MPU 56 of the control device 55 specifies the amount of heat consumed for each outlet based on information from the sensor units 66 and 67 (the amount and temperature of hot water used at each outlet). About the specified heat consumption, it memorize | stores in RAM58 of MPU56 in the state distinguished for every consumed day (refer DG of FIG. 8).

  Sensor units 91 and 92 having a temperature sensor and a flow rate sensor are disposed between the hot water storage tank 60 on the parent household side, the solar heat collector 61 and the electric water heater 62 (see FIG. 1). The sensor units 91 and 92 are connected to the control device 55, and the control device 55 determines the amount of heat supplied to the hot water in the hot water storage tank 60 from the solar heat collector 61 and the electric water heater 62 as information from the sensor units 91 and 92. Based on each. The specified supply heat amount is stored in a state of being distinguished for each day supplied to the RAM 58 of the MPU 56 (see FIGS. 8A and 8B).

  The control device 55 is connected with attached sensor units 76 and 77 at each water outlet on the child household side. The MPU 56 of the control device 55 specifies the amount of heat consumption for each outlet based on information from the sensor units 76 and 77 (the amount and temperature of hot water used at each outlet). About the specified heat consumption, it memorize | stores in RAM58 of MPU56 in the state distinguished for every consumed day (refer DG of FIG. 8).

  A sensor unit 95 having a temperature sensor and a flow rate sensor is disposed between the hot water storage tank 70 and the gas water heater 72 on the child household side (see FIG. 1). The sensor unit 95 is connected to the control device 55, and the control device 55 specifies the amount of heat supplied from the solar heat collector 71 to the hot water in the hot water storage tank 60 based on information from the sensor unit 95. The specified supply heat amount is supplied and stored in the RAM 58 of the MPU 56 in a state of being distinguished for each day (see B in FIG. 8).

  The control unit 55 is connected to the sensor units 82 and 83 disposed in the communication pipe 80. The MPU 56 of the control device 55 specifies the amount of heat exchanged from the child household to the parent household based on the information from the sensor unit 82 on the parent household side, and determines the amount of heat exchanged from the parent household to the child household side. This is specified based on information from the sensor unit 83. Each identified heat amount is stored in the RAM 58 of the MPU 56 for each day of accommodation (see I and J in FIG. 8).

  The MPU 56 of the control device 55 calculates the amount of reduction in the utility cost due to the use of solar heat based on the various information stored in the RAM 58. The control device 55 is connected to a display terminal 59 disposed in each of the parent household and the child household, and information such as a calculation result of the reduction amount is displayed on the display screen of the display terminal 59. . Such information is displayed when a display operation is performed by the user on the display terminal 59, for example. A calculation system (information providing system) is constructed by the control device 55, the display terminal 59, and the sensor units 66, 67, 76, 77, 82, 83, 91, 92, and 95.

  Next, the process (reduction amount calculation process) related to the calculation and display of the reduction amount of the utility cost executed by the MPU 56 of the control device 55 will be described. The reduction amount calculation process is a process executed by the MPU 56 as part of the regular process. In this embodiment, the hot water supply mechanism differs between the parent household hot water supply facility 51 and the child household hot water supply facility 52, and the reduction amount calculation processing corresponds to the parent household and the child household. It is divided roughly into. Although the basic flow of these processes is the same, specific modes for calculating the reduction amount are individually set in consideration of the difference in the mechanism. Hereinafter, with reference to the flowchart of FIG. 9, the flow of the reduction amount calculation process will be described based on the calculation of the reduction amount related to the parent household-side hot water supply facility 51, and then the child household-side hot water supply focusing on the difference from the calculation. Calculation of the reduction amount of the facility 52 will be described.

  In the reduction amount calculation process, first, it is determined in step S301 whether or not it is time to calculate the reduction amount. Specifically, it is determined whether or not a display operation has been performed by the user, and whether or not a preset time has been reached when the display operation has not been performed. When a negative determination is made in step S301, the reduction amount calculation process is terminated as it is. If a positive determination is made in step S301, the process proceeds to step S302.

  In step S302, based on the information stored in the RAM 58, the total amount of heat consumed today in the household (the household) that is the object of calculation is calculated. Specifically, the total amount of heat consumed is calculated for each household by adding up the amount of heat consumed by the household and the amount of heat exchanged with other households. For example, the total heat consumption Yn on the nth day in the parent household is represented by the following formula (1).

式（１）における、Ｄｎはｎ日目に親世帯のキッチン設備２４にて消費された消費熱量、Ｅｎはｎ日目に親世帯の洗面台２３にて消費された消費熱量、Ｆｎはｎ日目に親世帯のシャワー設備２２にて消費された消費熱量、Ｇｎはｎ日目に親世帯のバスユニット２１にて消費された消費熱量、Ｊｎはｎ日目に親世帯から子世帯に融通された融通熱量である。

In Formula (1), Dn is the amount of heat consumed by the kitchen facility 24 of the parent household on the nth day, En is the amount of heat consumed by the sink 23 of the parent household on the nth day, and Fn is n days. The amount of heat consumed by the shower facility 22 of the parent household, Gn is the amount of heat consumed by the bus unit 21 of the parent household on the nth day, and Jn is interchanged from the parent household to the child household on the nth day. The amount of heat exchanged.

  In the subsequent step S303, the self-sufficiency rate of today's heat amount in the corresponding household is calculated based on the information stored in the RAM 58. For example, the self-sufficiency ratio Sn on the nth day in the parent household is expressed by the following formula (2).

式（２）における、Ａｎはｎ日目に親世帯の太陽熱集熱器６１により（貯湯タンク６０へ）供給された供給熱量、Ｒｎはｎ日目に親世帯の貯湯タンク６０に残った残り熱量、Ｌは放熱による貯湯タンク６０の熱量の低下を示す貯湯ロス係数、Ｚｎは親世帯におけるｎ日目の総供給熱量である。例えば、親世帯におけるｎ日目の残り熱量Ｒｎ及び総供給熱量Ｚｎは、以下の式（３），（４）により表される。

In Formula (2), An is the amount of heat supplied to the hot water storage tank 60 of the parent household on the nth day (to the hot water storage tank 60), and Rn is the remaining heat amount remaining in the hot water storage tank 60 of the parent household on the nth day. , L is a hot water storage loss coefficient indicating a decrease in the amount of heat in the hot water storage tank 60 due to heat radiation, and Zn is the total amount of heat supplied on the nth day in the parent household. For example, the remaining heat amount Rn and the total supply heat amount Zn on the nth day in the parent household are expressed by the following formulas (3) and (4).

式（３），（４）における、Ｂｎは電気給湯機６２により（貯湯タンク６０へ）供給された供給熱量であり、Ｉｎはｎ日目に子世帯から親世帯に融通された融通熱量である。つまり、親世帯における供給熱量と、前日からの残り熱量と、子世帯から親世帯への融通熱量との和がｎ日目の総供給熱量Ｚｎであり、この総供給熱量Ｚｎから親世帯における消費熱量と親世帯から子世帯への融通熱量とを引いた値がｎ日目の残り熱量Ｒｎとなる。

In equations (3) and (4), Bn is the amount of heat supplied by the electric water heater 62 (to the hot water storage tank 60), and In is the amount of heat exchanged from the child household to the parent household on the nth day. . In other words, the sum of the amount of heat supplied from the parent household, the amount of heat remaining from the previous day, and the amount of heat transferred from the child household to the parent household is the total amount of heat supplied Zn on the nth day. The value obtained by subtracting the amount of heat and the amount of heat transferred from the parent household to the child household is the remaining heat amount Rn on the nth day.

  After calculating the self-sufficiency rate in step S303, the reduction amount Vn of today's utility bill in the corresponding household is calculated in step S304. The reduction amount Vn on the nth day in the parent household is expressed by the following equation (5).

変換定数ｋ（「補正係数」に相当）は、電力単価を電力１ＫＷあたりの熱量及び電気給湯機６２の平均効率で除すことで得られる値である。総消費熱量Ｙｎと自給率Ｓｎとを乗じることで親世帯にて消費された熱量及び子世帯に融通した熱量のうち太陽熱集熱器６１による供給熱量を特定し、これに変換定数ｋを乗じることで電気給湯機６２を稼働させて（電力を消費して）同じ熱量を確保しようとした場合の光熱費、すなわち親世帯におけるｎ日目の削減量Ｖｎが算出される。

The conversion constant k (corresponding to “correction coefficient”) is a value obtained by dividing the unit price of power by the amount of heat per 1 kW of power and the average efficiency of the electric water heater 62. Multiply the total heat consumption Yn and the self-sufficiency ratio Sn to specify the amount of heat supplied by the solar heat collector 61 out of the amount of heat consumed in the parent household and the amount of heat accommodated in the child household, and multiply this by the conversion constant k Thus, the utility cost when the electric water heater 62 is operated (consuming electric power) to secure the same amount of heat, that is, the reduction amount Vn on the nth day in the parent household is calculated.

  After calculating the reduction amount Vn in step S304, the process proceeds to step S305. In step S305, a process for displaying information such as the reduction amount Vn on the display screen of the display terminal 59 is performed. The display terminal 59 displays each data of the total consumption, the self-sufficiency rate, and the reduction amount on the display screen based on an instruction from the control device 55 (see FIG. 10). On the display screen, not only the data for the current day but also the past data is displayed.

  As shown in the schematic diagram of FIG. 11 (a), when hot water is not interchanged from the parent household to the child household, the reduction amount is calculated taking into account the amount of heat exchanged to the child household; There is no difference between the calculation of reductions without taking into account the amount of heat available to child households. On the other hand, as shown in the schematic diagram of FIG. 11 (b), in the case where accommodation from the parent household to the child household is performed, the reduction amount is calculated in consideration of the amount of heat exchanged to the child household. Compared to the case, the value is smaller when the reduction amount is calculated taking into account the amount of heat exchanged to the child household. Because of these differences, displaying the reduction amount that does not take into account the heat of accommodation gives the user the impression that the benefits of the electric water heater 62 are less than the original benefits, and the impression of the hot water accommodation function It can be a factor to lower. Therefore, there is concern that it will hinder the promotion of the use of the interchange function. In this regard, according to the configuration shown in the present embodiment, since the reduction amount is calculated and displayed in consideration of hot water (heat amount) that has been accommodated in other households, the occurrence of the inconvenience can be suitably suppressed.

  The basic flow for calculating the reduction corresponding to the child household is the same as the flow for calculating the reduction corresponding to the parent household, but the formulas used to calculate each value are different.

  The total heat consumption Y′n on the nth day in the child household is expressed by the following equation (6).

式（６）における、Ｄ´ｎはｎ日目に子世帯のキッチン設備３４にて消費された消費熱量、Ｅｎはｎ日目に子世帯の洗面台３３にて消費された消費熱量、Ｆｎはｎ日目に子世帯のシャワー設備３２にて消費された消費熱量、Ｇｎはｎ日目に子世帯のバスユニット３１にて消費された消費熱量、Ｉｎはｎ日目に子世帯から親世帯に融通された融通熱量である。

In Formula (6), D′ n is the amount of heat consumed in the kitchen facility 34 of the child household on the nth day, En is the amount of heat consumed in the sink 33 of the child household on the nth day, and Fn is The amount of heat consumed in the shower facility 32 of the child household on the nth day, Gn is the amount of heat consumed in the bus unit 31 of the child household on the nth day, and In is transferred from the child household to the parent household on the nth day This is the amount of heat exchanged.

  The self-sufficiency rate S′n on the nth day in the child household is expressed by the following formula (7).

式（７）におけるＡ´ｎはｎ日目に子世帯の太陽熱集熱器７１により（貯湯タンク７０へ）供給された供給熱量である。

A′n in equation (7) is the amount of heat supplied by the solar heat collector 71 of the child household (to the hot water storage tank 70) on the nth day.

  Moreover, the reduction amount V'n of the nth day's utility bill in a child household is calculated. The reduction amount V′n is expressed by the following equation (8).

式（８）において変換定数ｋ´（「補正係数」に相当）は、ガス単価をガス１Ｌあたりの熱量及びガス給湯器７２の平均効率で除した変換定数である。総消費熱量Ｙ´ｎと自給率Ｓ´ｎとの積に変換定数ｋ´を乗じることでガス給湯器７２の稼働（ガスの消費）によって同じ熱量を確保しようとした場合の光熱費、すなわち削減量Ｖ´ｎが算出される。

In equation (8), the conversion constant k ′ (corresponding to “correction coefficient”) is a conversion constant obtained by dividing the gas unit price by the amount of heat per liter of gas and the average efficiency of the gas water heater 72. Reduction of utility costs when trying to secure the same amount of heat by operating the gas water heater 72 (gas consumption) by multiplying the product of the total heat consumption Y'n and the self-sufficiency S'n by the conversion constant k ' A quantity V′n is calculated.

  According to the embodiment described in detail above, the following excellent effects are obtained.

  The solar heat collectors 61 and 71 are more susceptible to the weather than a gas water heater or an electric water heater, and the amount of hot water that can be generated varies. In addition, the amount of hot water used in each household in daily life is not necessarily constant. If there is a day when the amount of hot water used increases, there are days when the amount of hot water used is low. Here, as shown in the present embodiment, if a hot water supply system 50 capable of accommodating hot water among a plurality of households is constructed, for example, when one household has insufficient hot water, excess hot water You can get hot water from other households. Thereby, energy consumption, such as electricity and gas at the time of hot water supply, can be suppressed. Therefore, it is possible to suitably improve the energy efficiency of a plurality of households while suppressing a decrease in usability of hot water.

  For each household where a solar heat collector is installed, calculate the amount of reduction in utility costs that can be reduced (saved) through the use of solar heat, and inform the user of the calculation results to determine the benefits of the solar heat collector. It is possible to clarify whether it is a degree. The amount of reduction in the utility cost is calculated based on the amount of heat consumed by the household, the amount of heat exchanged with other households, and the amount of heat exchanged with other households. Taking into account the amount of heat exchanged with other households, suppressing the discrepancy with respect to the benefits (indications) of the solar heating unit reduces the user's underestimation of the solar heat collector and uses the hot water interchange function. It is preferable for promotion.

  When the hot water storage type has a backup heating unit (electric water heater 62), the hot water in the hot water storage tank 60 is distinguished from that generated by the electric water heater 62 and that generated by the solar heat collector 61. Difficult to do. Therefore, the self-sufficiency rate may be calculated based on the amount of heat applied by the solar heat collector 61 and the amount of heat applied by the electric water heater 62 as shown in the present embodiment. Thus, the reduction amount can be easily calculated by multiplying the calculated self-sufficiency rate by the sum of the heat consumption amount and the interchangeable heat amount. Further, at least part of the hot water carried over from the previous day (carrying heat amount) may have been previously heated by the electric water heater 62. When the reduction amount is calculated without taking such carry-over heat amount into consideration, the calculation result can be smaller than the actual reduction amount. Therefore, as shown in the present embodiment, by calculating the reduction amount in consideration of the amount of heat carried over, it is possible to suitably improve the certainty of the calculation result. In the present embodiment, in particular, by calculating the carry-over heat amount in consideration of the heat amount interchanged between households, it is possible to suitably improve the accuracy of the carry-over heat amount calculation result, and consequently the calculation result by the reduction amount calculation means. ing.

  In a configuration in which hot water can be carried over, the amount of heat is lost with the passage of time from the stored hot water. Therefore, if the configuration is such that the amount of carry-over heat is reflected in the reduction amount in consideration of such heat loss, the certainty of the calculation result described above can be preferably improved.

  The sensor unit 83 for specifying the amount of heat to be accommodated from the parent household to the child household is arranged near the end of the child household in the connecting pipe 80, and the amount of heat to be accommodated from the child household to the parent household is determined. The sensor unit 82 for specifying is disposed near the end on the parent household side in the connection pipe 80. With such an arrangement, the heat of accommodation can be specified at a position as close as possible to the accommodation destination. Thereby, it can suppress that an error becomes large about the calculation result of a reduction amount resulting from the heat loss etc. which arise when hot water moves through the connection piping 80.

  In addition, it is not limited to the description content of embodiment mentioned above, For example, you may implement as follows. Incidentally, the configuration of another embodiment described below may be applied individually to the configuration in the above embodiment, or may be applied in combination with each other.

  (1) The above embodiment exemplifies the case where the calculation system for calculating the reduction in utility costs is applied to a hot water supply system that performs hot water interchange in both directions from the parent household to the child household and from the child household to the parent household. However, the present invention is not limited to this. When the hot water is to be accommodated only in one direction from the parent household to the child household and from the child household to the parent household, the above calculation system should be applied at least to the hot water supply system of the household from which the hot water is to be accommodated. It's enough.

  (2) In the above embodiment, the case where the calculation system is applied to the hot water supply system 50 capable of accommodating hot water between the households of two households is illustrated, but the present invention is not limited to this. The calculation system may be applied to a hot water supply system capable of accommodating hot water between the three households in a three-family house. Moreover, it is also possible to apply the said calculation system to the hot-water supply system which can accommodate hot water between many households in apartment houses, such as an apartment.

  (3) In the above-described embodiment, the utility cost is calculated → notified while the utility cost reduced (saved) by the solar heat collector 61 is used, but the present invention is not limited to this. For example, instead of or in addition to the reduction in utility costs, the configuration may be such that the amount of purchase energy reduced by the solar heat collector 61 is calculated and notified, or the amount of heat reduced by the solar heat collector 61 is calculated. → It is good also as a structure to alert | report.

  (4) In the above-described embodiment, the heat consumption amount and the accommodation heat amount are specified based on the information from the flow rate sensor and the temperature sensor. However, the specific configuration for specifying the heat consumption amount and the accommodation heat amount is arbitrary. is there. For example, a configuration may be adopted in which the amount of heat consumed and the amount of heat exchanged are specified based on information from a temperature sensor and a measuring means such as a timer for measuring the hot water supply time.

  (5) In the parent household in which the heat pump type electric water heater 62 is disposed, when there is remaining hot water from the previous day in the hot water storage tank 60, the amount of heat (remaining heat amount) is taken into consideration to calculate the amount of reduction in utility costs. Although it was set as the structure which improves the certainty of reduction amount by this, it is not limited to this. The calculation of the reduction amount may be simplified by adopting a configuration in which the remaining heat amount is not considered in calculating the reduction amount.

  (6) In the above embodiment, the conversion constant k used when calculating the reduction amount on the parent household side is consumed by the specifications of the backup heating unit of the parent household from which hot water is available and the backup heating unit. Although the configuration is determined based on the unit price of purchased energy, etc., this may be changed as follows. That is, the conversion constant k may be determined based on the specifications of the backup heating unit of the child household that is the accommodation destination, the unit price of purchased energy consumed in the backup heating unit, and the like.

  (7) In the above embodiment, the sensor unit 83 for monitoring the amount of heat exchanged from the parent household to the child household and the sensor unit 82 for monitoring the amount of heat exchanged from the child household to the parent household are provided separately. It is not limited to. It is also possible to adopt a configuration in which the amount of heat exchanged in each direction is monitored by one sensor unit. Further, the arrangement of the sensor unit is arbitrary. For example, the arrangement of the sensor unit 82 and the sensor unit 83 can be switched.

  (8) In the above embodiment, various configurations such as the sensor unit 66 and the control device 55 that constitute the hot water supply system are used in the calculation system. However, the present invention is not limited to this. A configuration for realizing the calculation of the reduction amount can be provided separately from the hot water supply system. In addition, when the calculation system is applied to a hot water supply system having a calculation function such as the amount of heat, the reduction amount may be calculated with reference to the calculation result of the heat amount in the hot water supply system.

  (9) In the above embodiment, the solar heat collectors 61 and 71 reduce the utility cost (first information) to the user. However, in addition to this, it is reduced in each household. It is also possible to notify the reduction amount (second information) of the utility cost. In this way, by making it possible to grasp the reduction amount in one's own household, it is possible to meet various needs of users. In addition, when setting it as such a structure, it is good also as a structure by which both 1st information and 2nd information are displayed collectively, and the information alert | reported according to a user's switching request | requirement is 1st information / 1st. It is good also as a structure switched by 2 information.

  DESCRIPTION OF SYMBOLS 10 ... Building, 50 ... Hot water supply system, 51 ... Parent household side hot water supply equipment, 52 ... Child household side hot water supply equipment, 55 ... Control apparatus which has a function as "reduction amount calculation means", 56 ... MPU, 59 ... Display terminal, DESCRIPTION OF SYMBOLS 60 ... Hot water storage tank, 61 ... Solar collector as a "solar heating part", 62 ... Electric water heater as a "backup heating part", 66, 67 ... Sensor unit, 68 ... Electric valve, 70 ... Hot water storage tank, 71 ... solar collector as "solar heating part", 72 ... gas water heater as "backup heat source", 76, 77 ... sensor unit, 78 ... electric valve, 80 ... connecting pipe as "connecting pipe", 81 ... Motorized valves, 82, 83... Sensor units as “detecting units”, 85, 86... Sensor units, 91, 92, 95.

Claims (9)

A solar heating unit that heats the supplied water by solar heat, a backup heating unit that consumes purchase energy to generate hot water, and a hot water supply pipe that supplies hot water from the solar heating unit and the backup heating unit to the water outlet A calculation system that is applied to a hot water supply system and that calculates a reduction amount of at least one of the purchase energy and the operating cost of the backup heating unit that are reduced with the use of hot water heated by the solar heating unit. ,
The hot water supply system can accommodate hot water heated by the solar heating unit from a predetermined household provided with the hot water supply system to another household,
A heat consumption specifying means for specifying the heat consumption based on the use of hot water in the predetermined household;
An accommodation heat amount specifying means for specifying an accommodation heat amount based on accommodation of hot water from the predetermined household to the other household;
A calculation comprising: a reduction amount calculation means for calculating the reduction amount based on the heat consumption amount calculated by the heat consumption amount specification means and the accommodation heat amount specified by the accommodation heat amount specification means system. The predetermined household and the other household can exchange hot water between the households,
The accommodation heat quantity specifying means is a first accommodation heat quantity specifying means for specifying a first accommodation heat quantity that is the accommodation heat quantity,
A second accommodation heat amount specifying means for specifying a second accommodation heat amount based on accommodation of hot water from the other household to the predetermined household;
The reduction amount calculation means is specified by the heat consumption amount specified by the heat consumption amount specification means, the first accommodation heat amount specified by the first accommodation heat amount specification means, and the second accommodation heat amount specification means. The calculation system according to claim 1, wherein the amount of reduction is calculated based on the second amount of heat of accommodation. The hot water supply system has a hot water storage tank that stores the water heated by the solar heating unit as hot water, and the hot water storage type backup heating that can store a set amount of hot water in the hot water storage tank in advance as the backup heating unit Have
The second interchangeable heat amount calculated by the second interchangeable heat amount specifying means, the amount of heat applied by the solar heating unit of the predetermined household, and the amount of heat applied by the backup heating unit of the predetermined household Based on the self-sufficiency rate calculating means for calculating a self-sufficiency rate as a ratio of the amount of heat provided for the generation of hot water in the predetermined household,
The reduction amount calculating means is calculated by the self-sufficiency rate calculating means as a sum of the consumed heat amount specified by the consumed heat amount specifying means and the first interchanged heat amount specified by the first interchangeable heat amount specifying means. The calculation system according to claim 2, wherein the reduction amount is calculated by multiplying by a self-sufficiency rate. The connecting pipe formed to connect the predetermined household and the other household and allow hot water to pass therethrough is provided with a detection unit for detecting the amount and temperature of hot water passing through the connecting pipe. ,
The first interchangeable heat amount specifying means specifies the first interchangeable heat amount based on detection information from the detection unit when hot water is interchanged from the predetermined household to the other household through the connection pipe. And
The second interchangeable heat amount identifying means identifies the second interchangeable heat amount based on detection information from the detection unit when hot water is interchanged from the other household to the predetermined household through the connection pipe. The calculation system according to claim 2 or claim 3, wherein The detection unit includes a first detection unit provided in a portion of the connecting pipe that is on the other household side, and a second detection unit provided in a portion of the connection pipe that is on the predetermined household side. And
The first interchangeable heat amount specifying means specifies the first interchangeable heat amount based on detection information from the first detection unit,
5. The calculation system according to claim 4, wherein the second interchangeable heat amount specifying unit specifies the second interchangeable heat amount based on detection information from the second detection unit. The hot water supply system has a hot water storage tank that stores the water heated by the solar heating unit as hot water, and the hot water storage type backup heating that can store a set amount of hot water in the hot water storage tank in advance as the backup heating unit Have
The reduction amount calculating means calculates the reduction amount in consideration of the carry-over heat amount of the hot water when at least a part of the hot water stored in the hot water storage tank is hot water carried over from the previous day. The calculation system according to any one of claims 1 to 5. The predetermined household and the other household can exchange hot water between the households,
The accommodation heat quantity specifying means is a first accommodation heat quantity specifying means for specifying a first accommodation heat quantity that is the accommodation heat quantity,
Second accommodation heat amount specifying means for specifying a second accommodation heat amount based on accommodation of hot water from the other household to the predetermined household;
First heating amount specifying means for specifying the amount of heat applied by the solar heating unit;
A second heating amount specifying means for specifying the amount of heat applied by the backup heating unit;
In the predetermined household, the total amount of heat specified by the first heating amount specifying means and the second heating amount specifying means and the second amount of heat specified by the second accommodation heat amount specifying means are added together. A total supply heat amount calculating means for calculating a total supply heat amount;
Subtracting the consumed heat amount specified by the consumed heat amount specifying unit and the first interchanged heat amount specified by the first interchanged heat amount specifying unit from the total supplied heat amount calculated by the total supplied heat amount calculating unit. The calculation system according to claim 6, further comprising: a carry heat amount calculation unit that calculates the carry heat amount. A correction coefficient corresponding to heat loss that occurs with time in the hot water storage tank of the predetermined household is set,
The calculation system according to claim 6 or 7, wherein the reduction amount calculation unit includes a correction unit that corrects the carry-over heat amount by using the correction coefficient.   The calculation system according to any one of claims 1 to 8, further comprising a display terminal capable of displaying the reduction amount calculated by the reduction amount calculation means.

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