JP5961565B2 - Feed water preheating system and feed water temperature control method for feed water preheating system - Google Patents

Description

  The present invention relates to a feed water preheating system and a feed water temperature control method for a feed water preheating system that can efficiently use solar heat and waste heat from a cogeneration system in an apartment house.

  There is a preheating type hot water supply system that preheats tap water for hot water supply using waste heat such as solar heat and a cogeneration system in an apartment house. In the conventional preheating hot water supply system, the water in the hot water storage tank is heated by the waste heat of the solar heat collector or cogeneration system, and hot water of a certain temperature is sent to each dwelling unit by a mixer set at a predetermined temperature. I was supplying.

  As such a hot water preheating system using solar heat or the like, for example, a solar collector having a light receiving surface for collecting solar heat has a light receiving surface on the handrail portion of the veranda of the apartment house. The collector is installed in a vertical direction, and the collector is configured to heat the liquid inside by the heat of sunlight received by the light receiving surface, and the collector is a collector for circulating the liquid in the collector. A hot water storage tank provided in the vicinity of the reinforcing bar fixing portion of the veranda is thermally connected to the collector-side liquid circulation passage, and the liquid in the collector-side liquid circulation passage is connected to the collector-side liquid circulation passage. There is a heat collection utilization heating control means for heating hot water in the hot water storage tank with heat collected by the heat collector by circulating the water (Patent Document 1).

JP 2012-13393 A

  However, for example, since the tap water temperature is high in summer, the amount of heat required to obtain hot water at a predetermined temperature is small. On the other hand, in winter, the amount of heat necessary to obtain hot water at a predetermined temperature increases. For this reason, in the summer, there is a surplus of heat from the solar heat collector, etc., the utilization rate of these heats decreases, and in winter there is a risk that the heat will be insufficient.

  In addition, for example, when using solar heat, the hot water temperature in the hot water tank is high from the daytime to immediately after sunset, so this heat can be effectively used in dwelling units that use hot water at a relatively early time from the evening. . On the other hand, in a dwelling unit that uses hot water at midnight, there is a fear that the hot water in the hot water tank is insufficient and the heat cannot be used. Thus, with the conventional method, it has been difficult to use heat fairly and effectively in the entire apartment house.

  This invention is made | formed in view of such a problem, and it aims at providing the water supply preheating system etc. which can utilize the solar heat and the waste heat of a cogeneration system fairly and effectively in an apartment house.

In order to achieve the above-mentioned object, the first invention is a water supply preheating system, which is connected to the hot water storage tank that can store hot water, a preheating device that heats the hot water in the hot water storage tank, and the hot water storage tank. A mixer for mixing hot water in a hot water tank and tap water, a water heater connected to the mixer and provided in each door of an apartment house, a sensor for detecting the hot water temperature and the amount of hot water in the hot water tank, A control unit for controlling the mixing ratio of hot water in the mixer, and a storage unit for storing the total amount of hot water sent to the hot water heater of each door in the apartment house, and the preheating device Preheating the hot water in the hot water storage tank, and at a predetermined time, the control unit calculates the amount of heat stored in the hot water storage tank using the sensor, and the control unit stores the past data stored in the storage unit. Divide the amount of heat by the total amount of hot water used Te to calculate the heating temperature of the preheating water supplied, the control unit, the heating temperature so that the temperature obtained by adding the tap water temperature to control the hot and cold water mixing ratio in the mixer, the use of the apartment When the amount of hot water is larger than planned and the amount of heat in the hot water tank is insufficient, a backup burner for heating the hot water in the hot water tank is used, and when the backup burner is used, at least The water supply preheating system is characterized in that when the hot water / water mixing ratio is calculated in the control unit on the next day, correction is performed to lower the predetermined temperature from the heating temperature .

By doing this, the amount of heat in the hot water tank is divided by the total amount of hot water expected to be used in the apartment, and the hot water temperature after mixing in the mixer is set. It is possible to suppress a large change in the temperature of the hot water after mixing in the mixer depending on the usage time. Further, since the hot water temperature is changed depending on whether the amount of solar heat collection is large or small, it is possible to reduce the surplus or shortage of heat. Furthermore, by using a backup burner, hot water can be supplied even to users of late-night hot water, for example, even if heat is insufficient. Further, in this case, when the heating amount for the next day is set, it is possible to suppress a shortage of the heat amount by performing a correction that lowers by a predetermined temperature.
The second invention is a water supply preheating system, a hot water tank that is always filled with hot water, a preheating device that heats the hot water in the hot water tank, the hot water in the hot water tank connected to the hot water tank, A mixer for mixing tap water, a water heater connected to the mixer and provided in each door of an apartment house, a sensor for detecting the temperature and amount of hot water in the hot water tank, and hot water in the mixer A control unit for controlling the mixing ratio, and a storage unit for storing the total amount of hot water sent to the hot water heater of each house in the apartment house in a day, and the hot water in the hot water tank is supplied by the preheating device. Preheating, the control unit calculates the amount of heat stored in the hot water storage tank using the sensor at a predetermined time, the control unit is based on the past total hot water usage stored in the storage unit Heat the preheated water to be supplied after removing the heat The control unit controls the hot water mixing ratio in the mixer so that the heating amount becomes a temperature obtained by adding the heating amount to the tap water temperature, and the control unit controls the hot water temperature of the hot water storage tank to When the waste heat upper limit temperature of the cogeneration system constituting the preheating device is exceeded, when the hot water mixing ratio in the control unit is calculated, correction is performed to increase the predetermined temperature from the heating amount. It is a feed water preheating system.

  The preheating device may include at least a solar heat collector.

  By doing in this way, the solar heat and the waste heat of a cogeneration system can be used effectively.

The preheating device, viewed contains at least cogeneration system, wherein the control unit, the lower limit of the hot water temperature of water in the water heater, the amount of heat obtained by subtracting the heat radiation loss from the waste heat predicted amount by the cogeneration system of the day It is desirable that the heating amount obtained by dividing by the total amount of hot water used is a temperature obtained by adding the tap water temperature.

  By doing in this way, the waste heat of a cogeneration system can be used more effectively.

  Moreover, it is preferable that the control unit sets an upper limit of the hot water temperature supplied to the water heater to be equal to or lower than a minimum set temperature of the water heater.

  In this way, by preventing the minimum set temperature of the water heater from being exceeded, it is possible to prevent hot water having a temperature equal to or higher than the set temperature even from being set to the minimum set temperature.

  The predetermined time is set between 16:00 and 18:00 after the amount of preheating by the solar heat collector constituting the preheating device is reduced and before the amount of hot water used in the apartment is increased. It is desirable.

  By doing in this way, since the amount of heat collection by the solar heat of the day is roughly determined, the accuracy of prediction of the amount of heat available for the day is high. Moreover, since there is usually a peak in the amount of hot water used after 18:00, the heat can be used efficiently by setting the heat usage before this.

  The preheating device includes at least a solar heat collector and a cogeneration system, and the control unit is configured to perform the cogeneration when the amount of heat collected by the solar heat collector is lower than a predetermined amount at the predetermined time. The operating time of the cogeneration system may be shortened when the operating time of the system is extended and the amount of heat collected by the solar heat collector is higher than a predetermined amount.

  Thus, by adjusting the waste heat amount of the cogeneration system according to the amount of solar heat collected, it is possible to supply almost the same amount of heat regardless of the weather or the like.

3rd invention is the water supply temperature control method of the feed water preheating system concerning 1st invention, Comprising: The heat amount stored in the said hot water storage tank by the said sensor is detected at the predetermined time, The past said hot water total use amount The heating amount per unit water amount is calculated by dividing the amount of heat in step 1, and the hot water mixing ratio in the mixer is set so that the heating temperature becomes the water supply temperature obtained by adding the heating temperature to the tap water temperature. The feed water temperature control method of the feed water preheating system.

  By doing in this way, heat can be used effectively in an apartment house, and heat can be supplied fairly to each dwelling unit.

  ADVANTAGE OF THE INVENTION According to this invention, the water supply preheating system etc. which can utilize the waste heat of a solar heat and a cogeneration system fairly and effectively can be provided in an apartment house.

The block diagram which shows the feed water preheating system 1. FIG. The hardware block diagram which shows the feed water preheating management apparatus. The flowchart which shows the water supply temperature control method of the feed water preheating system. The figure which shows an example of transition of the total hot water consumption in a dwelling unit, and the amount of heat recovery of a preheating apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a feed water preheating system 1. The water supply preheating system 1 includes a solar heat collecting device 3 and a gas engine 5, which are preheating devices, a hot water storage tank 7, a water supply preheating management device 10, a mixer 17, a water heater 21 installed in each dwelling unit 19, and the like. Composed.

  The solar heat collecting device 3 receives sunlight and collects heat by a heat medium circulating in a circuit in the device. The hot water in the hot water storage tank 7 is heated by the heat collected by the solar heat collecting device 3.

  The gas engine 5 is a cogeneration system that generates power by burning gas and uses waste heat generated by gas combustion. The temperature of the hot water in the hot water storage tank 7 is raised by the waste heat recovered by the gas engine 5. Note that the cogeneration system may be other fuel cells or the like instead of the gas engine 5.

  The hot water tank 7 can store hot water inside. A pipe 11 is connected to the hot water tank 7. Tap water is supplied to the hot water tank 7 through the pipe 11 (in the direction of arrow A in the figure). In addition, the piping 11 branches in part, and one piping 11 is connected to the hot water tank 7, and the hot water tank 7 is always filled with water. The other pipe 11 is connected to the mixer 17 and supplies tap water to the mixer 17 (in the direction of arrow B in the figure). Details of the mixer 17 will be described later. The total amount of tap water supplied to the hot water tank 7 and the mixer 17 can be detected by the water meter 13.

  The hot water tank 7 is provided with a backup burner 15. The backup burner 15 can raise the temperature of hot water in the hot water tank 7. The hot water tank 7 is provided with a hot water temperature sensor and a hot water amount sensor, which are not shown. The temperature and amount of hot water stored in the hot water storage tank 7 can be detected by the hot water temperature sensor and the hot water amount sensor.

  The gas engine 5, the solar heat collector 3, the hot water tank 7, the backup burner 15, the mixer 17, etc. are connected to the feed water preheat management device 10. The feed water preheating management device 10 controls each device and the like. In addition, the water supply preheating management device 10 can acquire various information detected by the hot water temperature sensor, the hot water sensor, and the water meter 13 described above.

  A pipe discharged from the hot water tank 7 and a pipe branched from the pipe 11 through which the tap water flows are connected to the mixer 17. The mixer 17 can change the amount of hot water from the hot water tank 7 and the mixing ratio of tap water. That is, the mixer 17 can change the temperature of the hot water supplied after mixing (the supply hot water temperature).

  The outlet side of the mixer 17 branches into a plurality of pipes 12. Each pipe 12 is connected to a water heater 21 installed in each dwelling unit 19 of the apartment house 9. That is, the hot water mixed by the mixer 17 is distributed to each dwelling unit 19 (in the direction of arrow C in the figure) and can be supplied to the water heater 21 of each dwelling unit 19. The hot water heater 21 can set the hot water supply temperature for each dwelling unit 19 within a predetermined range. Therefore, when hot water having a temperature lower than the set temperature of the water heater 21 is supplied, the hot water 21 of each dwelling unit raises the temperature of the hot water so that the set temperature is reached.

  FIG. 2 is a hardware configuration diagram illustrating the feed water preheating management device 10. The water supply preheating management device 10 includes, for example, a control unit 23, a storage unit 25, a media input / output unit 27, a communication control unit 29, an input unit 31, a display unit 33, a peripheral device I / F unit 35, and the like. Connection is made via a bus 37. In addition, although the example which is a computer is demonstrated as the water supply preheating management apparatus 10, the structure will not be limited if there exists each part control function of this invention.

  The control unit 23 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU calls and executes a program stored in the storage unit 25, ROM, recording medium or the like to a work memory area on the RAM, drives and controls each device connected via the bus 37, and supplies the water preheating management device 10 The processing performed by is realized.

  The ROM is a non-volatile memory and permanently holds a computer boot program, a program such as BIOS, data, and the like. The RAM is a volatile memory, and temporarily stores programs, data, and the like loaded from the storage unit 25, ROM, recording medium, and the like, and includes a work area used by the control unit 23 to perform various processes.

  The storage unit 25 is an HDD (hard disk drive) or SSD (flash SSD) (solid state drive), and stores a program executed by the control unit 23, data necessary for program execution, an OS (operating system), and the like. As for the program, a control program corresponding to an OS (operating system) and an application program corresponding to processing described later are stored. Each of these program codes is read by the control unit 23 as necessary, transferred to the RAM, read by the CPU, and executed as various means. The storage unit 25 stores various data used in the present invention.

  The media input / output unit 27 (drive device) inputs / outputs data, for example, a floppy (registered trademark) disk drive, a CD drive (-ROM, -R, RW, etc.), a DVD drive (-ROM, -R, etc.). -RW etc.) and media input / output devices such as MO drives.

  The communication control unit 29 has a communication control device, a communication port, and the like, and is a communication interface that mediates communication between the computer and the network.

  The input unit 31 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad. An operation instruction, an operation instruction, data input, and the like can be performed on the computer via the input unit 31.

  The display unit 33 includes a display device such as a CRT monitor and a liquid crystal panel, and a logic circuit (such as a video adapter) for realizing a video function of the computer in cooperation with the display device.

  The peripheral device I / F (interface) unit 35 is a port for connecting a peripheral device to the computer, and the computer transmits and receives data to and from the peripheral device via the peripheral device I / F unit 35. For example, it is connected to the water meter 13 and each sensor, and various information can be acquired.

  The bus 37 is a path that mediates transmission / reception of control signals and data signals between the devices.

  Next, the control method of the feed water preheating management apparatus 10 in the feed water preheating system 1 of this invention is demonstrated. FIG. 3 is a flowchart illustrating a control method of the feed water preheating management device 10. First, the control unit 23 sets a time for calculating the amount of heat (step 101). The feed water preheating management device 10 calculates the amount of heat preheated by the preheating device once a day, and controls the mixer 17 and the like described later based on the calculation. The time for calculating the amount of heat and performing various controls is determined, for example, as follows.

  FIG. 4 shows the amount of hot water used in the entire apartment house 9 (total amount of hot water or water supplied to the water heater 21), the amount of heat by each preheating device (the amount of solar heat collected by the solar heat collector 3 and the amount of gas engine 5). It is a figure conceptual diagram which shows the change of a day of (waste heat amount). Hot water usage peaks mainly in the morning and evening. For example, the amount of hot water used increases after 18:00.

  On the other hand, the amount of solar heat collected is greatest during the day and falls in the evening and eventually stops collecting heat. In the illustrated example, a sunny day is assumed, but the amount of heat collection varies depending on the weather. However, after the sun goes down, no more heat can be gained in any weather.

  The amount of waste heat of the gas engine varies depending on the operation time of the gas engine 5. In the illustrated example, an example is shown in which operation is performed from approximately 14:00 to 22:00. While the gas engine 5 is operating, heat generated by the gas engine 5 can be used.

  It is desirable for the water supply preheating management device 10 of the present invention to determine the future amount of hot water used before the amount of hot water used increases. For example, by determining the expected amount of hot water before peaking at night, it is possible to prevent a person who comes home late at night from using the hot water. Such time is preferably between 16:00 and 18:00, for example, and is preferably set to about 17:00 (D in the figure).

  On the other hand, if it is time mentioned above, the amount of heat collection by the solar heat of the day can be known correctly. As mentioned earlier, it is difficult to predict the amount of heat collected due to the weather, etc., but it is difficult to collect heat in the evening, so know the amount of heat collected so far. be able to. Note that the amount of waste heat of the gas engine 5 can be predicted with relatively high accuracy by the operation schedule of the gas engine 5. Therefore, the amount of waste heat from the gas engine 5 can be known at any time of the day.

  Thus, by calculating the amount of heat stored in the hot water tank 7 from 16:00 to 18:00 in the evening, it is possible to accurately grasp the amount of solar heat collected on that day, and to peak the amount of hot water usage at night Various controls can be performed before. Therefore, it is desirable that the time for calculating the amount of heat described above is from 16:00 to 18:00 in the evening. Note that time information for calculating the amount of heat or various information for determining the time is stored in advance in the storage unit 25, and the control unit 23 acquires the heat amount calculation time from the storage unit 25.

  Next, the control unit 23 acquires the amount of heat in the hot water tank 7 when the heat amount calculation time comes (step 102). The amount of heat in the hot water tank 7 is acquired using, for example, a hot water temperature sensor and a hot water amount sensor. Moreover, the control part 23 acquires the water temperature of a tap water with a water temperature sensor etc. For example, if the tap water temperature is 20 ° C., the hot water temperature is 60 ° C., and the hot water amount is 1500 L, the amount of heat can be calculated as (60 ° C.−20 ° C.) * 1500 L. This amount of heat is the amount of heat stored in the day.

  The controller 23 adds the amount of waste heat of the gas engine 5 that can be recovered in the subsequent time. As described above, since the gas engine 5 operates according to a preset schedule, the amount of waste heat thereafter can be calculated with relatively high accuracy. Therefore, the control unit 23 can also calculate the amount of heat in the hot water tank 7 by adding the amount of waste heat that can be recovered until the currently operating gas engine 5 stops to the amount of heat described above. Information on the amount of waste heat per hour of the gas engine 5 is stored in the storage unit 25.

  Further, the control unit 23 can also consider the heat dissipation loss of the hot water tank 7 in calculating the amount of heat. The heat dissipation loss varies depending on the heat retaining property of the hot water tank 7, but can be about 15%, for example. The heat dissipation loss information is stored, for example, in the storage unit 25 and is acquired by the control unit 23. The heat dissipation loss information may be corrected as needed based on daily data such as actual temperature decrease information.

  Next, the control unit 23 acquires the total amount of hot water and water used per day in the apartment house 9 (step 103). Here, the total amount of hot water used in the present invention is the total amount of hot water supplied to all the water heaters 21 installed in each dwelling unit 19. As for the total amount of hot water used, for example, the performance of the previous day is stored in the storage unit 25, and the control unit 23 acquires the total amount of hot water usage from the storage unit 25. The total amount of hot and cold water used is measured by a water meter 13. The total amount of hot water used can be averaged for about 1 to 2 weeks, for example. Further, the past hot water usage information used may be properly used depending on the day of the week or the season.

  Next, the control part 23 sets the heating amount of the hot water supplied to each dwelling unit 19 (step 104). That is, the control unit 23 sets the hot water temperature supplied to each dwelling unit 19. The amount of heating is calculated by the amount of heat acquired in steps 102 and 103 / total amount of hot water used. For example, in the above-described example, when the total amount of preheated water used is 10,000 L, (60 ° C.−20 ° C.) * 1500 L / 10000 L = 6 ° C. is calculated. That is, while the tap water is 20 ° C., hot water of 26 ° C. is supplied to each dwelling unit 19. Actually, the amount of waste heat of the gas engine 5 after the calorific value calculation time is added to this, and further, the amount of heat radiation loss is subtracted to set the supply hot water temperature.

  In addition, when the hot water temperature of the hot water storage tank 7 is near the waste heat temperature of the gas engine 5 (for example, 70 to 75 ° C.), the control unit 23 determines that the use of heat is not progressing, and the hot water temperature of the hot water storage tank 7 is The hot water temperature may be increased so as to decrease. For example, the hot water temperature may be increased by 5 ° C.

  Here, the control unit 23 may set the upper limit of the heating amount as follows. The water heater 21 can be set to a desired temperature in each dwelling unit 19. At this time, there is a minimum set temperature unique to the device of the water heater 21. If this temperature is greatly exceeded, hot water that is hotter than the set temperature of the water heater 21 will come out of the water heater 21. Therefore, the control unit 23 may control the above-described supply hot water temperature to be equal to or lower than the lowest set temperature of the water heater 21.

  More preferably, the control unit 23 sets the upper limit of the hot water supply temperature to the minimum set temperature −5 ° C. of the water heater 21. The hot water heater 21 is usually difficult to perform delicate heating (for example, + 1 ° C. to + 5 ° C.). Therefore, for example, when hot water of 33 ° C. is supplied with respect to the minimum set temperature of 35 ° C., the hot water heater 21 cannot be heated by 2 ° C., and the hot water temperature becomes unstable, for example, by heating more than that. . Therefore, it is desirable that the control unit 23 sets the upper limit of the supplied hot water temperature to the lowest set temperature −5 ° C. of the water heater 21. Such upper limit information of the supplied hot water temperature is stored in the storage unit 25, for example, and when the control unit 23 determines that the supplied hot water temperature exceeds the upper limit by the heating amount calculated in step 104, the upper limit of the supplied hot water temperature is set. What is necessary is just to set as a value.

  The control unit 23 may set the lower limit of the heating amount as follows. For example, as described above, the operation schedule of the gas engine 5 is set in advance. For this reason, the amount of heat corresponding to the operating time or the like is always recovered from the gas engine 5. Therefore, even if solar heat cannot be recovered at all, it is possible to roughly calculate how much heat can be stored in the hot water tank 7 by the waste heat of the gas engine 5. Therefore, the control unit 23 can secure at least the amount of waste heat of the gas engine 5 (subtracting the heat dissipation loss) as the amount of heat, and if the supply hot water temperature falls below this amount of heat, the waste recovered from the gas engine 5 is recovered. Heat cannot be used effectively.

  Therefore, it is desirable that the control unit 23 sets the lower limit value of the supplied hot water temperature based on the amount of heat recovered (including the schedule) from the gas engine 5.

  Next, the control part 23 controls the mixing ratio in the mixer 17 so that it may become supply hot water temperature (tap water temperature + heating temperature) (step 105). That is, the mixing ratio between the amount of hot water supplied from the hot water tank 7 and the amount of tap water is calculated, and the mixer 17 is controlled so as to be the mixing ratio. As described above, hot water at a predetermined temperature can be supplied. At this time, it is possible to suppress a shortage of heat or excess heat depending on the use time of the hot water.

  If the control unit 23 determines that the amount of heat (the amount of hot water) in the hot water tank 7 is insufficient, it can also operate the backup burner 15. By doing in this way, even if it is a case where a lot of hot water is used rather than expected, it can suppress that supply hot water temperature fluctuates. In this case, it is desirable to correct the total amount of hot water and the amount of heating in the control after the next day. For example, when the backup burner 15 is operated on the previous day, when calculating the feed water heating amount in step 104, a correction may be performed so as to lower the temperature by a predetermined temperature (for example, 1 ° C. or several percent). In addition, when performing such control, it can also set so that the correction | amendment which increases the hot_water | molten_metal supply temperature accompanying the hot water temperature rise of the hot water storage tank 7 mentioned above may not be performed.

  As described above, according to the water supply preheating system 1 of the present embodiment, the waste heat of the cogeneration system such as the solar heat collector 3 and the gas engine 5 can be used fairly and effectively in the apartment house 9. Become. Therefore, it is possible to benefit from the water supply preheating system 1 in all the dwelling units regardless of the usage time of the user. Thus, by making heat available to all the dwelling units 19 fairly, it is possible to charge for this heat. In other words, since the amount of heat supplied is determined by the amount of hot water sent to the water heater, the heat usage fee can be recovered according to the amount of hot water used.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, in the above-described embodiment, the case where both the solar heat collector 3 and the gas engine 5 are used has been described, but the present invention is not limited to this. At least one preheating device may be used.

  When both the solar heat collector 3 and the gas engine 5 are used, the operation time of the gas engine 5 may be controlled according to the amount of heat collected by the solar heat collector. For example, if it is determined in step 102 that the hot water storage tank 7 is not sufficiently collecting heat by the solar heat collecting device 3 (for example, during bad weather), the control unit 23 extends the operating time of the gas engine 5 by 1 hour, The amount of heat recovered by the gas engine 5 is increased. On the other hand, if it is determined that the amount of heat collected by the solar heat collecting device 3 is greater than or equal to a predetermined amount, the operating time of the gas engine 5 can be shortened by 1 hour, and the heat recovered by the gas engine 5 can be reduced. By doing in this way, the change of the supply hot water temperature by the weather can be made small.

  Since the operation time per month of the gas engine 5 is set, the above-described control is adjusted so that the operation time of the gas engine 5 per month becomes the set time. For example, if a bad weather day continues in the first half of the month, even if it is determined that solar heat collection is not sufficient even in the second half of the month, the set operating time of the gas engine 5 cannot be exceeded. Control is performed so as to shorten the operating time of the engine 5.

1 ... Water supply preheating system 3 ... Solar heat collector 5 ... Gas engine 7 ... Hot water tank 9 ... Housing 10 ... Water supply preheat management devices 11, 12 ... Pipe 13 ... ...... Water meter 15 ......... Backup burner 17 ......... Mixer 19 ......... Dwelling unit 21 ......... Water heater 23 ......... Control unit 25 ......... Storage unit 27 ......... Media input / output unit 29 ... ... Communication control unit 31 ......... Input unit 33 ......... Display unit 35 ......... Peripheral device I / F unit 37 ......... Bus

Claims (8)

A water supply preheating system,
A hot water tank always filled with hot water,
A preheating device for heating the hot water in the hot water tank;
A mixer connected to the hot water tank and mixing hot water of the hot water tank and tap water;
A water heater connected to the mixer and provided in each door of the apartment house;
A sensor for detecting the temperature and amount of hot water inside the hot water tank;
A control unit for controlling a mixing ratio of hot water and water in the mixer;
A storage unit that stores the total amount of hot water sent to the water heater of each house in the apartment house in a day;
Comprising
Preheat the hot water in the hot water storage tank by the preheating device,
The control unit calculates the amount of heat stored in the hot water storage tank using the sensor at a predetermined time,
The control unit calculates the heating temperature of the preheated water to be supplied by dividing the calorific value by the past total hot water usage amount stored in the storage unit,
The control unit controls the hot water / water mixing ratio in the mixer so as to be a temperature obtained by adding the heating temperature to the tap water temperature ,
When the amount of hot water used in the housing complex is larger than planned, and when the amount of heat in the hot water tank is insufficient, a backup burner for heating the hot water in the hot water tank is used,
In the case where the backup burner is used, a correction for lowering the predetermined temperature from the heating temperature is performed when the hot water / water mixing ratio is calculated at least by the control unit on the next day . A water supply preheating system,
A hot water tank always filled with hot water,
A preheating device for heating the hot water in the hot water tank;
A mixer connected to the hot water tank and mixing hot water of the hot water tank and tap water;
A water heater connected to the mixer and provided in each door of the apartment house;
A sensor for detecting the temperature and amount of hot water inside the hot water tank;
A control unit for controlling a mixing ratio of hot water and water in the mixer;
A storage unit that stores the total amount of hot water sent to the water heater of each house in the apartment house in a day;
Comprising
Preheat the hot water in the hot water storage tank by the preheating device,
The control unit calculates the amount of heat stored in the hot water storage tank using the sensor at a predetermined time,
The control unit calculates the heating amount of the preheated water to be supplied by dividing the heat amount by the past total hot water usage amount stored in the storage unit,
The control unit controls the mixing ratio of hot water and water in the mixer so as to be a temperature obtained by adding the heating amount to the tap water temperature,
When the hot water temperature of the hot water storage tank exceeds the waste heat upper limit temperature of the cogeneration system constituting the preheating device, the control unit calculates the hot water mixing ratio in the control unit, A feed water preheating system characterized by performing a correction to increase a predetermined temperature from a heating amount. The feed water preheating system according to claim 1 or 2, wherein the preheating device includes at least a solar heat collector. The preheating device includes at least a cogeneration system,
The control unit is a heating obtained by dividing the lower limit of the hot water temperature to be supplied to the hot water heater by the amount of heat obtained by subtracting a heat radiation loss from the estimated amount of waste heat generated by the cogeneration system per day by the total amount of hot water used. the amount, water preheating system according to any one of claims 1 to 3, characterized in that the temperature obtained by adding tap water temperature.   The water supply preheating system according to any one of claims 1 to 4, wherein the control unit sets an upper limit of the hot water temperature supplied to the water heater to be equal to or lower than a minimum set temperature of the water heater.   The predetermined time is set between 16:00 and 18:00 after the amount of preheating by the solar heat collector constituting the preheating device is reduced and before the amount of hot water used in the apartment is increased. The feed water preheating system according to any one of claims 1 to 5, wherein The preheating device has at least a solar collector and a cogeneration system,
The control unit extends the operation time of the cogeneration system when the amount of heat collected by the solar heat collector is lower than a predetermined amount at the predetermined time, and the amount of heat collected by the solar heat collector is larger than a predetermined amount. The feed water preheating system according to any one of claims 1 to 6 , wherein when the temperature is high, the operation time of the cogeneration system is shortened. A water supply temperature control method for a feed water preheating system according to any one of claims 1 to 7 ,
At a predetermined time, the amount of heat stored in the hot water tank is detected by the sensor,
Divide the amount of heat by the total amount of hot water used in the past to calculate the amount of heating per unit amount of water,
A water supply temperature control method for a water supply preheating system, wherein a mixing ratio of hot water and water in the mixer is set so as to be a water supply temperature obtained by adding the heating amount to a tap water temperature.

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