JP2004263941A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration system capable of improving operating efficiency by effectively utilizing heat generated from a cogeneration device and supplying hot water into a bathtub, with respect to the cogeneration system comprising the cogeneration device generating heat and electric power, and an exhaust heat type heating means for heating hot water in a hot water storage tank by heat generated by the cogeneration device, and further comprising a hot water supply means for supplying hot water into the bathtub by performing tapping operation to supply the hot water into the bathtub until a water level in the bathtub reaches a predetermined hot water supply target water level. <P>SOLUTION: This cogeneration system comprises a bathtub state detecting means for detecting bathtub states relating to the water level and a water temperature in the bathtub, and the hot water supply means determines the set supplied hot water temperature on the basis of the state of remaining hot water as the bathtub state detected by the bathtub state detecting means and a hot water supply target state determined as the target of the bathtub state, and perform the tapping operation. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a combined heat and power device that generates heat and electric power, an exhaust heat type heating unit that heats hot and cold water in a hot water storage tank with heat generated by the combined heat and power device, and a bathtub that removes hot and cold water from inside the hot water storage tank. A bath water supply means for supplying water into the bath, and a supply water temperature for setting a supply water temperature of the water supplied to the bath by adjusting a mixing ratio of the water supply to the water supplied to the bath by the bath water supply means. Setting means, and setting the supply hot water temperature to a predetermined set supply hot water temperature by the supply hot water temperature setting means, until the water level in the bathtub reaches a predetermined hot water filling target water level. The present invention relates to a cogeneration system comprising a filling means for performing filling operation for supplying hot water into the bathtub by means to fill the bathtub.
[0002]
[Prior art]
In the cogeneration system as described above, the cogeneration system is configured by a power generator or a fuel cell using a gas engine as a driving source, and operates the cogeneration system and operates the exhaust heat type heating means. Hot water is stored in the hot water storage tank using heat generated by the cogeneration system.
[0003]
Further, the cogeneration system can supply hot and cold water taken out from the hot water storage tank into the bath tub by a hot tub hot water supply means including a hot water supply path and a hot water path connected to the hot water storage tank. The hot and cold water supplied from the hot water storage tank is mixed with the hot water with a mixing ratio adjustment by a hot water temperature setting means comprising a mixing valve and the like provided in the tank. By configuring the hot water temperature to be configurable, the operation control device functions to set the hot water temperature to a predetermined set hot water temperature while the hot water filling means functions until the water level in the bathtub reaches the predetermined hot water level. The dropping operation of supplying hot water into the bathtub can be automatically executed.
[0004]
The filling means of the conventional cogeneration system, in the dropping operation, regardless of the presence or absence of remaining hot water in the bathtub, until the water level in the bathtub reaches the hot water target water level set in advance by the user. The hot water of the set supply hot water temperature equal to the hot water target water temperature set as the target of the water temperature in the bathtub in the same manner as the hot water target water level is supplied into the bathtub.
[0005]
Further, when the dropping operation is performed in a state where there is remaining hot water having a water temperature lower than the hot water filling target water temperature in the bathtub, the water temperature in the bathtub after the dropping operation is changed to the above-mentioned hot water. It will be lower than the target water temperature. Therefore, in the cogeneration, an auxiliary heating means for heating the hot water supplied into the hot water storage tank or the hot water taken out from the hot water storage tank by the combustion of the burner, and a heat exchange between the hot water and the hot water heated by the auxiliary heating means, so that the inside of the bathtub is heated. And a bathtub water heating heat exchanger for heating the water is provided, and after the above-mentioned filling operation, the dropping operation is performed, the auxiliary heating means and the bathtub water heating heat exchanger are operated. In some cases, a reheating operation for heating the water in the bath tub to the target water temperature is performed (for example, see Patent Document 1).
[0006]
As a cogeneration system for improving the operation efficiency of the cogeneration system, a cogeneration system configured to perform an operation plan of the cogeneration system based on past operation results has been proposed.
Such a cogeneration system includes, for example, an operation control unit including a computer, an operation planning unit that performs an operation plan of the cogeneration system based on the predicted heat load data, and further, based on past heat load data accumulated in a storage device. It is configured to function as heat load predicting means for deriving predicted heat load data to be used for an operation plan.
[0007]
[Patent Document 1]
JP 2001-248908 A
[0008]
[Problems to be solved by the invention]
However, in the cogeneration system having the above-described conventional hot water filling means, as described above, when the remaining hot water having a water temperature lower than the hot water target water temperature exists in the bathtub, a dropping operation is performed. Since the subsequent water temperature in the bathtub is lower than the target water temperature, it is necessary to always perform a subsequent reheating operation after the dropping operation. When the reheating operation is performed, it is necessary to operate the auxiliary heating means to heat the water in the bath tub at a relatively high temperature, so that the auxiliary heating means consumes energy separately from the combined heat source equipment. As a result, the operation efficiency of the cogeneration system may be reduced.
[0009]
Also, in the cogeneration system, the heat load when the hot water is filled from the state where the remaining hot water exists in the bathtub is the heat load when the hot water is filled from the empty state when the hot water is not present in the bathtub. Compared with the load, the remaining hot water decreases by the amount of heat held.
However, in the cogeneration system that performs the operation planning of the cogeneration system based on the past heat load described above, the heat source is not considered without considering whether or not the user uses the remaining hot water in the bathtub to fill the bath. Since the operation plan of the cogeneration system is performed, if the user fills the bath with the remaining hot water in the bathtub, the cogeneration system may generate more heat than necessary, or If the user fills the bath with no remaining hot water, the cogeneration system may not be able to generate enough heat to fill the bathtub, thus reducing the operating efficiency of the cogeneration system. May cause a decrease.
[0010]
The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the operation efficiency by effectively utilizing the heat generated by a cogeneration system, and to fill a bath in a bathtub. The point is to provide a generation system.
[0011]
[Means for Solving the Problems]
A first characteristic configuration of a cogeneration system according to the present invention for achieving the above object includes a cogeneration system that generates heat and electric power, and heats hot water in a hot water storage tank with heat generated by the cogeneration system. Exhaust heat type heating means, a bath water supply means for supplying hot water taken out of the hot water storage tank into the bath, and a mixing ratio adjustment of water supply to hot water supplied into the bath by the bath hot water supply means. A supply hot water temperature setting means for setting a supply hot water temperature of hot water supplied into the bathtub, and setting the supply hot water temperature to a predetermined set supply hot water temperature by the supply hot water temperature setting means. Until the water level reaches the predetermined hot water filling target water level, the bath tub hot water supply means executes a dropping operation of supplying hot water into the bath tub to fill the bath tub. A cogeneration system with the tension means,
A bathtub state detecting means capable of detecting a bathtub state related to the water level and the water temperature in the bathtub,
The bathing means determines the set supply hot water temperature based on a remaining hot water state that is a bathtub state detected by the bathtub state detection means and a bathing target state set as a target of the bathtub state, It is configured to perform a drop operation.
[0012]
That is, according to the cogeneration system having the first characteristic configuration, in the dropping operation performed by the hot water filling means, the water is taken out from the hot water storage tank until the water level in the bathtub reaches the preset hot water filling target water level. When the hot water is supplied into the bathtub, the temperature of the hot water supplied into the bathtub is adjusted by the remaining hot water state and the remaining water level in the bathtub, and the target water level and the target water temperature in the bathtub. Based on the target state, set the supply water temperature as high as possible but not higher than the water temperature in the hot water storage tank within the range that the water temperature in the bathtub after the dropping operation does not exceed the target water temperature in the water filling target state. As a result, the heat generated by the cogeneration system can be positively utilized as much as possible, and the operation efficiency can be improved.
[0013]
In particular, when the dropping operation is performed from the state where the remaining hot water exists in the bathtub, if the hot water in the hot water storage tank is higher than the hot water target water temperature, the set supply hot water temperature is higher than the hot water target water temperature. By setting the temperature high, the heat of the hot water in the hot water storage tank is used effectively, and the water temperature in the bathtub after the dropping operation is set as high as possible below the hot water target water temperature, and the energy consumed in the subsequent reheating operation is reduced. It can be as small as possible.
[0014]
A second feature configuration of the cogeneration system according to the present invention, in addition to the first feature configuration, is that the hot water filling means performs hot water supply into the bathtub by the bathtub hot water supply means before executing the dropping operation. Is provided so that a preparatory dropping operation for preliminarily supplying a preload can be performed.
[0015]
That is, according to the cogeneration system of the second characteristic configuration, when there is no remaining hot water in the bathtub, or even when the remaining hot water in the bathtub is too short, the preliminary dropping operation is performed before performing the preliminary dropping operation. By performing the operation, when performing the dropping operation, it is possible to ensure that there is sufficient remaining hot water in the bathtub to determine the supply hot water temperature, after that, performing the dropping operation, The heat generated by the cogeneration system can be effectively used.
[0016]
After the bathtub state detecting means determines that there is no remaining hot water or that the amount of remaining hot water is too small, the preparatory dropping operation can be executed. Conversely, performing the preliminary dropping operation before detecting the bathtub state by the bathtub state detection means is faster than performing the preliminary dropping operation after detecting the remaining hot water state as described above. Residual hot water can be made to exist in the bathtub so that the dropping operation can be performed at the appropriate time. Further, the preliminary dropping operation may be repeatedly performed until the bathtub state detecting means detects that there is sufficient residual hot water to execute the dropping operation.
[0017]
The third characteristic configuration of the cogeneration system according to the present invention, in addition to the second characteristic configuration, further includes a remaining hot water determination unit configured to determine whether there is remaining hot water in the bathtub based on an input signal of an input unit,
When the hot water filling means determines the presence of the remaining hot water by the remaining hot water determination means, skips the preliminary dropping operation and executes the dropping operation. When it is determined that there is no, the point is that the drop operation is executed after the preliminary drop operation is executed.
[0018]
That is, according to the cogeneration system having the third characteristic configuration, for example, when the remaining hot water use determining unit determines that the remaining hot water is not used by the input signal of the input unit for instructing the use of the remaining hot water by the user. Only, the preliminary dropping operation is executed, forcibly, when the dropping operation is executed, the remaining hot water is in a state where it is present, and conversely, when the remaining hot water determination means determines the presence of the remaining hot water, Assuming that the remaining hot water already exists in the bathtub, the preliminary dropping operation is skipped (omitted), and in addition to shortening the filling time, the amount of hot water supplied in the dropping operation is increased as much as possible. The operation efficiency can be further improved.
When the hot water filling means determines the presence of the remaining hot water by the remaining hot water determining means, and when the bathtub state detecting means determines that the remaining hot water does not exist or the amount of the remaining hot water is too small, the preliminary dropping is performed. May be performed.
[0019]
A fourth feature configuration of the cogeneration system according to the present invention, in addition to the third feature configuration, an operation planning unit that performs an operation plan of the cogeneration system based on the predicted heat load data,
Heat load predicting means for deriving the predicted heat load data from past heat load data according to the determination result of the remaining hot water determining means.
[0020]
That is, according to the cogeneration system of the fourth characteristic configuration, the heat load predicting means allows the user to use the past heat load data regarding the past heat load sequentially stored in a state in which the remaining hot water exists in the bathtub. Predicted heat load data can be derived by considering whether or not to fill the hot water based on the determination result of the remaining hot water determination means, and whether or not to perform the filling with the remaining hot water in the bathtub as described above. Based on the predicted heat load data derived according to the above, the operation plan of the combined heat and power equipment is made to operate according to the actual heat load as much as possible, and the heat generated by the combined heat and power equipment is effectively used. By doing so, the operation efficiency can be further improved.
[0021]
In addition, in the dropping operation performed by the hot water filling means, when remaining hot water is present, hot water having a set supply water temperature as high as possible or higher than the target set water temperature is supplied into the bathtub. The heat load due to the operation is larger than the heat load when the hot water of the target set water temperature is supplied into the bathtub even if residual hot water exists as in the past, and the heat load due to the dropping operation naturally increases in the past. Since the heat load data is reflected on the heat load data, the reliability of the past heat load data increases, and the prediction accuracy of the heat load prediction data can be improved.
[0022]
A fifth characteristic configuration of the cogeneration system according to the present invention, in addition to the first to fourth characteristic configurations, is a tub water heater that heats water in the bathtub by heat exchange with hot water taken out of the hot water storage tank. Equipped with a heat exchanger for
The hot water filling means is configured to be capable of performing a preheating operation of preheating the remaining hot water in the bathtub by the bathtub water heating heat exchanger before performing the dropping operation.
[0023]
That is, according to the cogeneration system of the fifth characteristic configuration, by preheating the remaining hot water in the bathtub by heat exchange with hot water taken out of the hot water storage tank by the bathtub water heating heat exchanger, In the subsequent dropping operation, the temperature of hot water to be supplied into the bathtub is set to be as low as possible below the temperature of hot water in the hot water storage tank, and subsequent reheating can be omitted, thereby further improving operation efficiency.
[0024]
Also, by performing the pre-heating operation before the dropping operation in this way, since the remaining hot water in the bathtub in the pre-heating operation is relatively low, the combined heat and power supply can be performed without operating the burner of the auxiliary heating means. The remaining hot water can be heated by heat generated in the device or by heat exchange with hot water in a hot water storage tank.
Further, by performing the preheating operation when the amount of hot water stored in the hot water storage tank is full, the heat generated by the combined heat and power equipment can be used more effectively.
[0025]
A sixth characteristic configuration of the cogeneration system according to the present invention for achieving the above object is as follows: a cogeneration system that generates heat and electric power; and the hot water in the hot water storage tank is heated by the heat generated by the cogeneration system. Exhaust heat type heating means, a bath water supply means for supplying hot water taken out of the hot water storage tank into the bath, and a mixing ratio adjustment of water supply to hot water supplied into the bath by the bath hot water supply means. A supply hot water temperature setting means for setting a supply hot water temperature of hot water supplied into the bathtub, and setting the supply hot water temperature to a predetermined set supply hot water temperature by the supply hot water temperature setting means. Until the water level reaches a predetermined set water level, the bathtub hot water supply means executes a dropping operation of supplying hot water into the bathtub and fills the bathtub with hot water. A cogeneration system equipped with a stage,
Remaining hot water determining means for determining the presence or absence of remaining hot water in the bathtub based on an input signal of the input unit,
Operation planning means for performing an operation plan of the cogeneration system based on the predicted heat load data,
Heat load predicting means for deriving the predicted heat load data from past heat load data according to the determination result of the remaining hot water determining means.
[0026]
That is, according to the cogeneration system having the sixth characteristic configuration, the heat load predicting means allows the user to use the past heat load data regarding the past heat load sequentially stored in a state where the remaining hot water exists in the bathtub. Predicted heat load data can be derived by considering whether or not to fill the hot water based on the determination result of the remaining hot water determination means, and whether or not to perform the filling with the remaining hot water in the bathtub as described above. Based on the predicted heat load data derived according to the above, the operation plan of the combined heat and power equipment is made to operate according to the actual heat load as much as possible, and the heat generated by the combined heat and power equipment is effectively used. By doing so, the operation efficiency can be improved.
[0027]
The seventh characteristic configuration of the cogeneration system according to the present invention, in addition to the sixth characteristic configuration, further includes a bathtub state detection unit that can detect a bathtub state related to a water level and a water temperature in the bathtub,
When the heat load prediction means determines the presence of the remaining hot water in the remaining hot water determination means, from the past heat load data, from the remaining hot water state is a bathtub state detected by the bathtub state detection means, The point is to derive the predicted heat load data.
[0028]
That is, according to the cogeneration system having the seventh characteristic configuration, when the remaining hot water is determined by the remaining hot water determination means, the filling is performed by the load prediction means in a state where the remaining hot water exists in the bathtub. By deriving the predicted heat load data in consideration of the remaining heat state with respect to the actual water level and the water temperature of the remaining heat, the operation efficiency can be further improved. .
[0029]
The eighth feature configuration of the cogeneration system according to the present invention is characterized in that, in addition to the sixth feature configuration, when the heat load prediction means determines the presence of the remaining hot water by the remaining hot water determination means, Deriving the predicted heat load data from the past heat load data with remaining hot water when the presence of the remaining hot water is determined, and determining that there is no remaining hot water by the remaining hot water determining means, The point is to derive the predicted heat load data from the past heat load data without remaining hot water when it is determined that there is no remaining hot water.
[0030]
That is, according to the cogeneration system of the eighth characteristic configuration, when the past heat load data is stored, when the remaining hot water is determined to be present in the past by the remaining hot water determination means and filling is performed in a state where the remaining hot water is present. The past heat load data with remaining hot water and the past heat load data without remaining hot water when the remaining hot water determining means determines that there is no remaining hot water and fills with no remaining hot water at that time are separately stored. Then, the load prediction means can derive the predicted heat load data from the past heat load data with remaining hot water or the past heat load data without remaining hot water according to the determination result of the remaining hot water determination means at that time. That is, it is possible to operate the cogeneration system in accordance with the actual heat load as much as possible without detecting the state of the remaining hot water relating to the actual water level and the water temperature of the remaining hot water.
[0031]
The ninth characteristic configuration of the cogeneration system according to the present invention includes, in addition to the eighth characteristic configuration, a bathtub state detection unit capable of detecting a bathtub state related to a water level and a water temperature in the bathtub,
In the case where the heat load prediction means determines the presence of the remaining hot water by the remaining hot water determination means, when the presence of the remaining hot water is determined in the past, the past heat load data with the remaining hot water and the bathtub state detection The point is to derive the predicted heat load data from the remaining hot water state which is the bathtub state detected by the means.
[0032]
That is, according to the cogeneration system having the ninth characteristic configuration, when the remaining hot water determining means determines the presence of the remaining hot water, the load predicting means uses the remaining hot water present past heat load data stored separately for each of the remaining hot water. It is possible to derive more accurate predicted heat load data in consideration of the remaining hot water state relating to the actual water level and the water temperature of the remaining hot water.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a cogeneration system according to the present invention will be described with reference to the drawings.
[0034]
As shown in FIGS. 1 and 2, the cogeneration system includes a cogeneration system 1 configured to drive a generator by a gas engine and a hot water storage system using the exhaust heat of the cogeneration system 1. It is composed of a hot water storage unit 2 for supplying hot water and heating, an operation control unit H for controlling the operation of the combined heat and power supply device 1 and the hot water storage unit 2, and the like.
[0035]
The hot water storage unit 2 includes a hot water storage tank 3 for storing hot water, a heat source circulation path 4 for circulating the hot water in the hot water storage tank 3, a heating means 5 for heating the hot water flowing through the heat source circulation path 4, and a heat source Heating heat exchanger 6 for heating the heating medium for terminal supply with hot and cold water flowing through circulation path 4, and water in bathtub 18 with hot and cold water flowing through heat source circulation path 4 (hereinafter referred to as bathtub water) ) Is heated, and a reheating heat exchanger 7 (an example of a bathtub water heating heat exchanger) is provided.
[0036]
A plurality of thermistors S for detecting the amount of hot water by detecting the temperature of the hot water are provided in the hot water storage tank 3, and the hot water storage tank 3 is supplied with water from the bottom of the hot water storage tank 3 using tap water supply pressure. A hot water supply path 8 is connected to the hot water supply path 8, and a hot water supply path 9 for supplying hot water from the upper part thereof is connected to the hot water storage tank 3.
[0037]
A mixing water supply channel 10 branched from the water supply channel 8 is connected to the hot water supply channel 9, and a mixing ratio between hot water from the hot water supply channel 9 and water from the mixing water supply channel 10 can be adjusted at the connection point. A mixing valve 11 is provided.
A water supply thermistor 12 for detecting a water supply temperature is provided at a branch point between the water supply path 8 and the mixing water supply path 10.
[0038]
A hot water storage outlet thermistor 13 for detecting the temperature of hot water supplied to the hot water supply passage 9 from above the hot water storage tank 3 is provided upstream of the mixing valve 11 in the hot water supply passage 9. Further downstream, a mixing thermistor 14 for detecting the temperature of the hot and cold water mixed by the mixing valve 7 and a flow control valve 15 are provided.
[0039]
Downstream of the location of the mixing thermistor 14 and the flow control valve 15 in the hot water supply passage 9, a general hot water supply passage 16 for supplying hot water to a hot water tap (not shown) such as a kitchen or a washroom, and hot water is supplied into a bathtub 18. And a hot-water path 17.
The hot water path 17 is connected to a bath return path 19 from inside the bathtub 18, and hot water is supplied into the bathtub 18 through both the bath return path 19 and the bath going path 20.
[0040]
The general hot water supply path 16 is provided with a hot water supply flow rate sensor 21 for detecting the flow rate of hot water flowing through the general hot water supply path 16, and the hot water path 17 is configured to detect the flow rate of hot water flowing through the hot water supply path 17. A filling flow sensor 22, a filling electromagnetic valve 23, a vacuum breaker 24, and a filling check valve 25 are provided in this order from the upstream side.
[0041]
The bathtub hot water supply means A is constituted by a hot water supply path 9, a flow control valve 15, a hot water path 17, a hot water electromagnetic valve 23, a bath return path 19, and the like, and opens the flow control valve 15 and the hot water electromagnetic valve 23. Then, hot water taken out of the hot water storage tank 3 is supplied into the bathtub 18 through the hot water supply path 9, the hot water filling path 17, and the bath return path 19.
[0042]
The supply hot water temperature setting means B comprises a hot water storage outlet thermistor 13, a water supply thermistor 12, a mixing valve 7, a mixing thermistor 14, and the like, and the water supply to the hot water supplied to the inside of the bathtub 18 or the hot water tap by the bathtub hot water supply means A or the like. Of the hot water supplied to the bathtub 18 or to the hot water tap is set.
[0043]
The heat source circulation path 4 and the hot water storage tank 3 return the hot water flowing through the heat source circulation path 4 to the hot water storage tank 3 or take out the hot water in the hot water storage tank 3 to the heat source circulation path 4. The hot water storage tank 3 is connected in communication at a total of two locations, that is, an upper portion and a bottom portion.
A hot water storage path 26 for supplying hot water from the heat source circulation path 4 into the hot water storage tank 3 is connected to an upper portion of the hot water storage tank 3, and a hot water storage opening / closing valve 27 is provided in the hot water storage path 26. I have.
At the bottom of the hot water storage tank 3, a take-out path 28 for taking out hot water from the hot water storage tank 3 to the heat source circulation path 4 is connected in communication, and a three-way connection point between the take-out path 18 and the heat source circulation path 4 is provided. A valve 29 is provided.
[0044]
Then, in the heat source circulation path 4, a circulation flow rate sensor 30 for detecting a circulation amount of the hot water in the heat source circulation path 4, a circulation pump 31, a heating unit 5, and a hot water Circulating flow regulating valve 32 for adjusting the circulation amount of water, heating temperature thermistor 33 for detecting the temperature of hot water heated by heating means 5, intermittent valve 34 for interrupting hot water flow, heat exchanger 6 for heating, A heating heat exchanger 7 is provided.
[0045]
The hot and cold water circulation means D includes a heat source circulation path 4, a circulation pump 31, a circulation flow sensor 30, a circulation flow adjustment valve 32, a heating temperature thermistor 33, a hot water storage opening / closing valve 27, an intermittent valve 34, and the like.
The hot water circulation means D heats the hot water taken out of the hot water storage tank 3 by the heating means 5, stores the heated hot water in the hot water storage tank 3, and exchanges the hot water heated by the heating means 5 for heating. The hot water supplied to the heat exchanger 6 and the heat exchanger 7 for reheating and passed through the heat exchanger 6 for heating and the heat exchanger 7 for reheating are returned to the heating means 5.
[0046]
The heating means 5 is composed of an exhaust heat type heating means 5a for heating hot and cold water with cooling water of a gas engine in the cogeneration system 1, and an auxiliary heating means 5b for heating hot and cold water by burning a burner.
[0047]
The exhaust heat type heating means 5a operates the cooling water circulation pump 35 during the operation of the cogeneration system 1 to supply the cooling water of the gas engine to the exhaust heat type heating means 5a through the cooling water circulation path 36, It is configured to heat the hot and cold water flowing through the circulation circuit 4.
[0048]
Although not shown, the auxiliary heating means 5b is provided with a gas combustion type burner, a fan for supplying combustion air to the burner, and the like, and heats the hot and cold water flowing through the heat source circulation path 4 by the combustion of the burner. It is configured as follows.
[0049]
A heating return path 37 and a heating outgoing path 38 are connected to the heating heat exchanger 6, and by operating a heating pump 39, a heat medium for terminal supply circulating through the heating returning path 37 and the heating outgoing path 38. , And the heating medium for heating the terminal supply is heated by the hot water heated by the heating unit 4.
[0050]
The heating return path 37 is provided with a heating return thermistor 40 for detecting the temperature of the heating medium in the heating return path 37, an open-air expansion tank 41, and a heating pump 39 in order from the upstream side in the circulation direction of the heating medium. The heating outflow path 38 is provided with a heating outflow thermistor 42 for detecting the temperature of the heat medium in the heating outflow path 37.
In addition, the heating return path 37 and the heating going path 38 are connected to each other through a bypass path 43.
[0051]
By activating the heating pump 39, the heating medium in the expansion tank 41 is circulated and supplied to the terminal T through the heating going path 38 and the heating returning path 37 in a state of passing through the heating heat exchanger 6. I have.
Although not described in detail, the terminal T is configured as a heating terminal that performs heating with a supplied heating medium such as a floor heating device or a bathroom drying / heating device.
[0052]
The expansion tank 41 has an upper limit sensor 44 for detecting the upper limit of the water level of the stored heat medium, a lower limit sensor 45 for detecting the lower limit, and an overflow sensor for detecting the occurrence of an overflow state in which the heat medium overflows from the expansion tank 41. 46 are provided.
The expansion tank 41 is connected to a tank water supply path 47 for branching off from the water supply path 8 and supplying water to the expansion tank 41, and the tank water supply path 47 is provided with a make-up water solenoid valve 48.
When the water level of the heat medium becomes the lower limit by the lower limit sensor 45, the supply water electromagnetic valve 48 is opened by the upper limit sensor 44 until the water level of the heat medium becomes the upper limit, and the heat medium is supplied to the expansion tank 41. It is configured as follows.
[0053]
A bath return path 19 and a bath outgoing path 20 are connected to the reheating heat exchanger 7, and the bath pump 49 is operated so that the reheating heat exchanger 7 is passed through the bath return path 19 and the bath outgoing path 20. The bathtub water is circulated between the bathtub 18 and the inside of the bathtub 18, and the bathtub water is heated by heat exchange with the hot water heated by the heating means 5.
[0054]
In the bath return path 19, a water level sensor 50 as a pressure detection type water level detection means for detecting a water level in the bath tub 18 and a temperature of the bath water in the bath return path 19 are sequentially arranged from the upstream side in the bathtub water circulation direction. A bath return thermistor 51, a two-way valve 52, a bath pump 49, and a bath water flow switch 53 to be detected are provided.
The bathtub state detecting means C capable of detecting the water level and the water temperature as the bathtub state in the bathtub includes a water level sensor 50 and a bath return thermistor 51.
[0055]
As shown in FIG. 2, the operation control unit H controls the operation of the co-generation system 1, the hot-water storage operation of the hot-water storage unit 2, the hot-water supply operation, the heating operation, and the hot-water storage unit 2 based on a command from the remote controller R or the like. By controlling the operation of various means such as bath water supply means A, supply water temperature setting means B, heating means 5 and water circulation means D, water having a target set water level and a target set water temperature in bath 18 is controlled. It is configured to execute various operation controls such as a hot water filling operation.
[0056]
Further, the remote controller R is provided with a remaining hot water use button R1 as an input unit for instructing the user to perform a hot water filling operation in a state where the hot water is present in the bathtub 18. Then, when the remaining hot water use button R1 of the remote controller R is pressed, the remaining hot water determining means H2 that the operation control unit H functions determines that there is remaining hot water in the bathtub 18 in the hot water filling operation performed on that day. On the contrary, when the remaining hot water use button R1 is not pressed before the hot water filling operation, it is determined that there is no remaining hot water in the bathtub 18 in the hot water filling operation executed on that day.
[0057]
Hereinafter, various operation controls performed by the operation control unit H will be described.
In the hot water storage operation, the circulation pump 31 is operated in a state where the intermittent valve 34 is opened and the hot water storage opening / closing valve 27 is opened, hot water is taken out from the bottom of the hot water storage tank 3 to the heat source circulation path 4 and heated. After heating to a desired temperature by the means 5, the operation is to supply the hot water to the upper portion of the hot water storage tank 3 through the hot water storage channel 26.
This hot water storage operation is performed during the operation of the combined heat and power supply device 1, and the hot and cold water heated by the waste heat type heating means 5 a is used by operating the cooling water circulation pump 35 to utilize the waste heat of the combined heat and power supply device 1. The hot water storage tank 3 is configured to store hot water.
[0058]
The hot water supply operation is started when a hot water tap is opened or a hot water filling request is instructed. Hot water stored in the hot water storage tank 3 is taken out, water is mixed with the hot water, and a desired temperature of the hot water is mixed. In this operation, hot water is supplied to the hot water tap and the bathtub 18.
When hot water is not stored in the hot water storage tank 3, the above-described hot water storage operation is performed in a state where the hot water is heated by the auxiliary heating means 5b, and the hot water is heated by the auxiliary heating means 5b. It is configured to mix and supply hot water at a desired set hot water temperature into the hot water tap or the bathtub 18.
[0059]
In the heating operation, the circulation pump 31 is operated in a state where the intermittent valve 34 is opened and the hot water storage opening / closing valve 27 is closed, and the hot water heated by the heating unit 4 is supplied to the heating heat exchanger 6. The heating pump 39 is operated, and the heating medium in the expansion tank 41 is circulated and supplied to the terminal T through the heating going path 38 and the heating returning path 37 in a state where the heating medium is passed through the heating heat exchanger 6. Have been.
In this heating operation, the opening degrees of the hot-water storage opening / closing valve 27 and the intermittent valve 34 are adjusted such that the detected temperature of the heating temperature thermistor 33 is, for example, 65 to 70 ° C.
[0060]
In the heating operation, when the combined heat and power supply device 1 is in operation, the cooling water circulation pump 35 operates to use the waste heat of the combined heat and power supply device 1 to heat the hot water with the waste heat type heating means 5a. The heated hot water is supplied to the heat exchanger 6 for heating.
When the waste heat of the combined heat and power supply device 1 is used as described above, the heating load required by the terminal T can be satisfied by heating the hot water with the waste heat utilizing heating means 5a. Then, the opening degree of the hot-water storage opening / closing valve 27 and the intermittent valve 34 is adjusted so that the detected temperature of the heating temperature thermistor 33 becomes the hot-water storage set temperature.
In addition, when the cogeneration system 1 is not operated, or when the heating load required by the terminal T cannot be covered only by heating the hot water with the exhaust heat type heating means 5a, the hot water storage opening / closing valve 27 is set. The valve is closed and the intermittent valve 34 is opened, the hot water is heated by the auxiliary heating means 5b, the heated hot water is supplied to the heating heat exchanger 6, and the heating load required by the terminal T is reduced. It is configured to cover.
[0061]
The filling operation is preset when the filling means H1 functioning as the operation control unit H presses a button for instructing the filling operation of the remote controller R or the like or in the remote controller R or the like. This operation is executed when the hot water filling start time comes. The hot water filling operation includes a dropping operation, a reheating operation, and the like.
[0062]
The dropping operation in the hot water operation is an operation executed when the water level in the bathtub 18 is lower than the hot water target water level set in advance by the remote controller R or the like. The bathtub detected by the water level sensor 50 while adjusting the mixing ratio of the hot water to the hot water supplied into the bathtub 18 and setting the hot water temperature of the hot water supplied to the bathtub 18 to a predetermined set hot water temperature. The flow rate control valve 15 and the hot water filling solenoid valve 23 are opened by the bath water / hot water supply means A until the water level in the hot water 18 reaches the hot water filling target water level, and the hot water taken out of the hot water storage tank 3 is put into the hot bath 18. Supply operation.
[0063]
The reheating operation in the hot water filling operation is an operation that is performed when the water temperature in the bathtub 18 is lower than the hot water target water temperature set in advance by the remote controller R or the like after performing the dropping operation, Specifically, the circulation pump 31 is operated to pass the hot water heated by the heating means 5 through the additional heat exchanger 7, and the bath pump 49 is operated to additionally heat the hot water in the bathtub 18. The water is circulated through the bath return path 19 and the bath outflow path 20 while passing through the heat exchanger 7, and the temperature of the bathtub water detected by the bath return thermistor 51 is set to the target set in advance in the same manner as the bathing target water level. This is an operation to heat the bathtub water until the temperature of the hot water is reached.
In this reheating operation, the opening degrees of the hot-water storage opening / closing valve 27 and the intermittent valve 34 are adjusted so that the detected temperature of the heating temperature thermistor 33 becomes, for example, 65 to 70 ° C.
[0064]
Further, in the reheating operation, as in the heating operation described above, when the cogeneration system 1 is operating, the cooling water circulation pump is adjusted while the hot water storage opening / closing valve 27 and the intermittent valve 34 are opened in the open state. By using the waste heat of the combined heat and power supply device 1 by the operation of 35, the hot and cold water heated by the waste heat type heating means 5a is supplied to the additional heat exchanger 7 so that the combined heat and power supply device 1 is not operated. Is required to close the hot-water storage opening / closing valve 27 and open the intermittent valve 34 to supply the hot water heated by the auxiliary heating means 5b to the additional heat exchanger 7, and It is designed to cover the reheating load.
[0065]
The hot water filling means H1 of the operation control unit H uses the heat generated by the cogeneration system 1 to improve the operation efficiency of the cogeneration system in order to improve the operation efficiency of the cogeneration system. The set supply hot water temperature in the dropping operation is determined based on the remaining hot water state that is the water level and the water temperature of the hot water and the hot water target state that is the hot water target water level and the hot water target water temperature. . Hereinafter, such a filling operation will be described with reference to a flowchart of the filling operation of FIG.
[0066]
In the hot water filling operation performed by the hot water filling means H1, first, the hot water filling means H1 is determined by the remaining hot water determination means H2 as to whether or not there is remaining hot water in the bathtub 18 (step 1). Only when it is determined that there is no such, the preliminary dropping operation (step 2) described later is executed.
[0067]
In the preliminary dropping operation in step 2 described above, the hot water temperature setting means B sets the hot water temperature of the hot water supplied into the bath tub 18 to a temperature as high as possible below the hot water filling target water temperature. This is an operation of supplying a relatively small amount of hot water into the bathtub 18 by the means A.
The preliminary dropping operation may be performed regardless of the presence or absence of the remaining hot water determined in step 1.
[0068]
When it is determined in step 1 that the remaining hot water is present by the remaining hot water determination means H2, or after the preliminary dropping operation is performed in step 2 above, the remaining hot water is surely contained in the bathtub 18. Therefore, the remaining water state between the water level V0 and the water temperature T0 in the bathtub 18 is detected by the water level sensor 50 and the bath return thermistor 51 as the bathtub state detecting means C (step 3). From the hot water state, the temperature Ta of the hot water to be supplied to the bath tub 18 in order to set the bath tub state with the water level and the water temperature in the bath tub 18 to the target hot water level with the hot water target water level V1 and the hot water target water temperature T1 (hereinafter, Ta) , Which will be referred to as an additional hot water temperature Ta).
[0069]
The method for deriving the additional hot water temperature Ta in step 4 will be described. The additional hot water temperature Ta is derived by the following equation (1).
[0070]
(Equation 1)
Ta = (Q1-Q0) / (V1-V0) + W0
[0071]
W0 is the temperature of the water supply detected by the water supply thermistor 12, and Q1 and Q2 are the residual heat amounts Q0 and Q0 of the remaining hot water derived from the remaining hot water states V0 and T0, which are derived from the following equation (2). The stored heat quantity Q1 of the hot water in the bathtub 18 after the hot water is derived from the hot water filling target states V1 and T1.
[0072]
(Equation 2)
Q0 = V0 × (T0−W0)
Q1 = V1 × (T1-W0)
[0073]
After the additional hot water temperature Ta is derived in step 4, the additional hot water temperature Ta is equal to or lower than the hot water temperature TT in the hot water storage tank 3 detected by the thermistor S (hereinafter, referred to as hot water storage temperature TT). It is determined whether or not (step 5).
[0074]
If it is determined in step 5 that the additional hot water temperature Ta is equal to or lower than the hot water storage temperature TT, the temperature is set to the temperature of the hot water to be supplied into the bathtub 18 in the dropping operation (step 8) executed later. The supply hot water temperature Tset is determined to be the additional hot water temperature Ta (step 6). Conversely, if it is determined that the additional hot water temperature Ta is higher than the hot water storage temperature TT, a dropping operation (step 8) executed later. ), The set supply hot water temperature Tset, which is the temperature of the hot water supplied into the bathtub 18, is determined as the hot water storage temperature TT (step 7).
[0075]
In this way, by determining the set supply hot water temperature Tset of the hot water supplied into the bathtub 18 in the dropping operation in step 7, the water temperature in the bathtub 18 after the dropping operation does not exceed the hot water target temperature T1. Within the range, the set supply hot water temperature Tset to be supplied into the bathtub 18 can be set as high as possible below the hot water storage temperature TT in the hot water storage tank 3, and the heat generated by the combined heat and power supply device 1 is positively used, The operation efficiency of the cogeneration system can be improved.
[0076]
When the set supply hot water temperature Tset is determined to be the hot water storage temperature TT in step 7 and the dropping operation in step 8 is executed, or in step 6 the set supply hot water temperature Tset is set to the additional hot water temperature Ta. If the hot water storage temperature TT falls below the additional hot water temperature Ta and the hot water at the additional hot water temperature Ta cannot be supplied into the bathtub 18 during the execution of the dropping operation in step 8 above, The water temperature in the bathtub 18 after executing the dropping operation is lower than the hot water target water temperature.
In such a case, after performing the dropping operation of the above step 7, the reheating operation (step 9) is performed to activate the auxiliary heating means 5b to fill the water temperature in the bathtub 18 with hot water. Reheating can be performed until the target water temperature is reached.
[0077]
If the remaining hot water use button R1 is pressed before the hot water filling operation is performed, and the remaining hot water determination means H2 determines that the remaining hot water already exists in the bathtub 18, the bath pump 49 May be operated to preheat the remaining hot water in the bathtub 18 by the reheating heat exchanger 7. By executing such a preheating operation, the additional hot water temperature Ta to be supplied to the bathtub 18 derived in the subsequent hot water filling operation is set to be as low as possible below the temperature of the hot water in the hot water storage tank. Omitting or shortening of the firing can further improve the operation efficiency.
[0078]
The cogeneration system described so far can be configured to perform an operation plan of the cogeneration system 1 based on past operation results, so that the operation efficiency can be further improved. Hereinafter, the configuration will be described. Add.
[0079]
The operation plan includes an operation plan unit H3 that performs an operation plan of the cogeneration system 1 based on the predicted load data in which the operation control unit H functions and a determination result of the remaining hot water determination unit H2 in which the operation control unit H also functions. The heat load predicting means H4 derives predicted heat load data from past heat load data accordingly.
[0080]
That is, the heat load predicting means H4 uses the past heat load data on the heat load in the past sequentially stored and stored in the storage means H5 provided in the operation control section H to perform the bathing operation of the user on the day. The system is configured to derive one day's predicted heat load data, taking into account whether or not filling is to be performed in a state in which remaining hot water exists in the bath 18, based on the determination result of the remaining hot water determining means H2.
[0081]
In addition, as described above, in the dropping operation in the hot water filling operation of the present embodiment, the hot water having the set supply hot water temperature as high as possible or higher than the target set water temperature is supplied from the hot water storage tank 3 into the bathtub 18. The past heat load data stored in H5 is at least a part of the heat load due to the additional cooking when the hot water of the target set water temperature is supplied into the bathtub 18 when the remaining hot water is present and the additional cooking is performed thereafter. Will be reflected.
[0082]
More specifically, the storage unit H5 is configured to update and store one day's past heat load data indicating how much heat load was applied during which time of day in a state of being associated with the day of the week. .
[0083]
Explaining the past heat load data, as shown in FIG. 4, the past heat load data for one day is configured to be stored in a state of being divided for each day of the week from Sunday to Saturday.
The past heat load data for one day is composed of 24 past heat load data per unit time, with one hour being a unit time out of 24 hours.
[0084]
A description will be given of a configuration for updating the past heat load data. A heat load per unit time is measured based on an actual use situation by a supply hot water temperature, a flow rate, and the like, and the measured heat load data is stored. The actual heat load data for the day is stored in association with the day of the week.
Then, when the actual heat load data for one day is stored for one week, new past heat load data is obtained by adding the past heat load data and the actual heat load data at a predetermined ratio for each day of the week. Then, the obtained new past heat load data is stored, and the past heat load data is updated.
[0085]
Specifically, taking Sunday as an example, as shown in FIG. 4, the past heat load data D1m corresponding to Sunday among the past heat load data, and the actual heat load data corresponding to Sunday among the actual heat load data. From A1, new past heat load data D1 (m + 1) corresponding to Sunday is obtained as shown in Expression 3 below, and the obtained past heat load data D1 (m + 1) is stored.
In the following equation 3, D1m is past heat load data corresponding to Sunday, A1 is actual heat load data corresponding to Sunday, K is a constant of 0.75, and D1 (m + 1) is And new past heat load data.
[0086]
(Equation 3)
D1 (m + 1) = (D1m × K) + {A1 × (1-K)}
[0087]
When the derivation process of the predicted heat load data is added, it is executed every time a date is changed, and one day's predicted load data of how much heat load is predicted in which time zone of the day is obtained. It is configured.
That is, of the seven past heat load data for each day of the week, the past heat load data corresponding to the day of the day and the actual heat load data of the previous day are added at a predetermined ratio, so as to determine how much heat during which time zone. It is configured to obtain temporary predicted heat load data for one day of the day as to whether the load is predicted.
[0088]
Specifically, a case where temporary predicted heat load data for one day on Monday is obtained will be specifically described. As shown in FIG. 4, seven past heat load data D1m to D7m for each day of the week and seven actual heat load data for each day of the week are provided. Since the heat load data A1 to A7 are stored, the past heat load data D2m corresponding to Monday and the actual heat load data A1 corresponding to Sunday the previous day are used to store the data of Monday as shown in the following Expression 4. The temporary predicted heat load data Q 'for one day is obtained.
Then, the provisional predicted heat load data Q 'for one day is composed of predicted heat load data for one day, as shown in FIG.
In the following Equation 4, D2m is past heat load data corresponding to Monday, A1 is actual heat load data corresponding to Sunday, K is a constant of 0.25, and Q ′ is Assume predicted load data.
[0089]
(Equation 4)
Q ′ = (D2m × K) + {A1 × (1-K)}
[0090]
Next, the heat load predicting means H4 processes the above-mentioned tentative predicted heat load data Q ', and when the remaining hot water determining means H2 determines that the hot water is to be filled in a state where the remaining hot water exists, the hot water filling is performed. When the heat load data Qa (FIG. 5 (b)) is obtained by estimating the heat load in the time period when it is considered to be performed, and conversely, it is determined that filling is to be performed in the state where there is no remaining hot water on that day. Then, the predicted heat load data Qb (FIG. 5 (c)) which largely estimates the heat load in the time period in which the filling is considered to be performed is derived.
In addition, in the temporary predicted heat load data, it is possible to recognize one hour at which the heat load is the highest and a time zone before that, as a time zone in which the filling is considered to be performed.
[0091]
More specifically, the heat load predicting means H4 derives a heat load q that is considered to have been consumed by filling with water from the temporary predicted heat load data Q '.
[0092]
The thermal load q considered to have been consumed by the hot water filling is a heat load (貯) for storing hot water of the target hot water level V1 and the hot water target temperature T1 in the empty bathtub 18 as shown in the following Expression 5. Although it can be derived as 1 ▼), in the past, the product of the heat load consumed and the frequency in the filling with the remaining hot water, and the filling with the remaining hot water in the absence of the hot water It can also be derived as the sum of the product of the consumed heat load and its frequency ((2)).
[0093]
(Equation 5)
q = Q1 ... ▲ 1 ▼
q = (Q1-Q0 ') × J + Q1 × (1-J) (2)
[0094]
In equation (5), as in equation (2), W0 represents the water supply temperature, Q1 represents the amount of heat retained in the bathtub 18 after the filling, derived from the filling target states V1 and T1, and J represents the remaining heat in the past. Shows the frequency of filling with hot water. Further, Q0 'indicates the remaining heat quantity of the remaining hot water at the time of filling, and as shown in the following equation 6, the filling of the remaining hot water quantity Q0 derived from the remaining hot water state V0, T0 at the time of heat load prediction. It can be derived by subtracting the amount of heat dissipated in the time until operation.
In Equation 6, N indicates the time until the hot water filling operation.
[0095]
(Equation 6)
Q0 '= Q0 × heat dissipation rate^N
[0096]
Then, when the remaining hot water determining means H2 determines that there is remaining hot water at the time of hot water filling on that day, the thermal load predicting means H4, as shown in FIG. The difference between the heat loads (Q1-Q0 ') required for filling the hot water in the presence of hot water is subtracted from the heat load of the time period when the hot water fills the day in the provisional predicted heat load data Q', and the prediction is performed. Deriving heat load data. Conversely, when the remaining hot water determining means H2 determines that there is no remaining hot water at the time of hot water filling on that day, the heat load predicting means H4, as shown in FIG. The difference between the heat load (Q1) required for filling in a state where there is no remaining hot water with respect to the heat load q due to filling is calculated based on the tentative predicted heat load data Q 'in the heat load in the time period when filling is performed on that day. To derive predicted heat load data.
[0097]
Then, based on the predicted heat load data derived in accordance with whether or not the filling is performed in a state where the remaining hot water exists in the bathtub 18 as described above, the operation planning of the combined heat and power supply device 1 is performed by the operation planning means H3. By doing so, the cogeneration system 1 is operated according to the actual heat load as much as possible, and the heat generated by the cogeneration system 1 is effectively used, so that the operation efficiency of the cogeneration system can be further improved.
[0098]
[Another embodiment]
<1> In the above embodiment, the heat load predicting means H4 determines the remaining hot water from the past heat load data D1m to D7m and the remaining hot water states V0, T0 at the time of the heat load prediction detected by the bathtub state detecting means C. Although the predicted heat load data Qa and Qb according to the determination result of the means H2 are configured to be derived, separately, the remaining hot water states V0 and T0 at the time of the heat load prediction detected by the bathtub state detection means C are not used. Predicted heat load data Qa and Qb according to the determination result of the remaining hot water determination means H2 can also be derived, and the configuration thereof will be described below.
[0099]
That is, the storage means H5 stores the past heat load data when the remaining hot water determination means H2 determines the presence of the remaining hot water and fills the bathtub 18 with the remaining hot water. The remaining hot water absence past heat load data when the remaining hot water is determined by the remaining hot water determination means H2 and the bathtub 18 is filled is stored separately.
[0100]
When the remaining hot water determining means H2 determines that filling is to be performed in a state where the remaining hot water exists, the heat load predicting means H4 uses the remaining hot water present past heat load data stored in the storage means H5. If the remaining hot water determination means H2 determines that filling is to be performed in a state where there is no remaining hot water, the above-described embodiment is performed by using the past heat load data without remaining hot water stored in the storage means H5. In the same manner as the method of deriving the temporary predicted heat load data, the derivation of the predicted heat load data can be derived.
[0101]
By deriving the predicted heat load data in this way, when it is determined by the remaining hot water determining means H2 that filling is to be performed in a state where the remaining hot water is present, the same as when the remaining hot water exists in the past. Deriving predicted heat load data that estimates the heat load at the time of filling is small, conversely, if it is determined that filling will be performed in the state where there is no remaining hot water on that day, it will be when there is no remaining hot water in the past Similarly, it is possible to derive predicted heat load data that largely estimates the heat load during filling.
[0102]
<2> In the above embodiment, as the heating means, an exhaust heat type heating means 5a for heating hot water with the exhaust heat of the gas engine and a gas combustion type auxiliary heating means 5b are exemplified. The thermal heating means 5a may be configured to heat hot water by the exhaust heat of the fuel cell, and the auxiliary heating means 5b may be provided with a liquid fuel combustion type burner or with an electric heater. The configurations of the exhaust heat type heating means 5a and the auxiliary heating means 5b can be appropriately changed.
[0103]
<3> In the above-described embodiment, in the filling operation, the preliminary dropping operation is performed when it is determined that there is no remaining hot water. Instead of performing this, the supply water temperature may be set to the target filling temperature and the dropping operation may be performed immediately.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a cogeneration system of the present invention.
FIG. 2 is a control block diagram of a cogeneration system.
FIG. 3 is a flowchart of hot water filling operation.
FIG. 4 is a diagram illustrating a process of updating past heat load data.
FIG. 5 is a graph showing predicted load data.
[Explanation of symbols]
1: Cogeneration system
3: Hot water storage tank
5: heating means
5a: Exhaust heat type heating means
5b: auxiliary heating means
7: Heat exchanger for reheating (heat exchanger for heating water in bathtub)
18: Bathtub
A: Bath water supply means
B: Supply hot water temperature setting means
D: Hot water circulation means
C: Bathtub state detection means
R: Remote control
R1: Button for using remaining hot water (input section)
H: Operation control unit
H1: Hot water filling means
H2: residual hot water determination means
H3: Operation planning means
H4: heat load prediction means
H5: storage means

Claims (9)

A cogeneration system that generates heat and electric power, an exhaust heat type heating unit that heats the hot water in the hot water storage tank with the heat generated by the cogeneration system, and supplies the hot water drawn out of the hot water storage tank into the bathtub. A bath water supply means, and a supply water temperature setting means for setting a supply water temperature of the water supplied into the bath by adjusting a mixing ratio of the supply water to the water supplied into the bath by the bath water supply means. The bath tub hot water supply means sets the supply hot water temperature to a predetermined set supply hot water temperature while setting the supply hot water temperature by the supply hot water temperature setting means until the water level in the bath tub reaches a predetermined hot water filling target water level. A cogeneration system comprising a filling means for performing a dropping operation of supplying hot water into the bathtub to fill the bathtub,
A bathtub state detecting means capable of detecting a bathtub state related to the water level and the water temperature in the bathtub,
The bathing means determines the set supply hot water temperature based on a remaining hot water state that is a bathtub state detected by the bathtub state detection means and a bathing target state set as a target of the bathtub state, A cogeneration system configured to perform a sinking operation. 2. The coke according to claim 1, wherein the hot water filling means is configured to be able to execute a preliminary dropping operation of preliminarily supplying hot water into the bathtub by the bathtub hot water supply means before executing the dropping operation. 3. Generation system. A remaining hot water determination unit that determines presence or absence of remaining hot water in the bathtub based on an input signal of the input unit,
When the hot water filling means determines the presence of the remaining hot water by the remaining hot water determination means, skips the preliminary dropping operation and executes the dropping operation. 3. The cogeneration system according to claim 2, wherein when it is determined that there is no drop, the drop operation is performed after the preliminary drop operation is performed. 4. Operation planning means for performing an operation plan of the cogeneration system based on the predicted heat load data,
4. The cogeneration system according to claim 3, further comprising: a heat load prediction unit that derives the predicted heat load data from past heat load data according to a determination result of the remaining hot water determination unit. 5. A heat exchanger for bathtub water heating that heats water in the bathtub by heat exchange with hot water taken out of the hot water storage tank,
The said filling means is comprised so that the preheating operation which preheats the remaining hot water in the said bathtub by the said bathtub water heating heat exchanger before the said dropping operation is performed can be performed. 5. The cogeneration system according to any one of 4. A cogeneration system that generates heat and electric power, an exhaust heat type heating unit that heats the hot water in the hot water storage tank with the heat generated by the cogeneration system, and supplies the hot water drawn out of the hot water storage tank into the bathtub. A bath water supply means, and a supply water temperature setting means for setting a supply water temperature of the water supplied into the bath by adjusting a mixing ratio of the supply water to the water supplied into the bath by the bath water supply means. While providing, while setting the supply hot water temperature to a predetermined setting supply hot water temperature by the supply hot water temperature setting means, the bathtub hot water supply means enters the bath tub until the water level in the bath tub reaches the predetermined setting water level. A cogeneration system comprising a filling means for performing filling operation for supplying hot water to fill the bathtub with hot water,
Remaining hot water determining means for determining the presence or absence of remaining hot water in the bathtub based on an input signal of the input unit,
Operation planning means for performing an operation plan of the cogeneration system based on the predicted heat load data,
A heat load predicting unit that derives the predicted heat load data from past heat load data in accordance with the determination result of the remaining hot water determining unit. A bathtub state detecting means capable of detecting a bathtub state related to the water level and the water temperature in the bathtub,
When the heat load prediction means determines the presence of the remaining hot water in the remaining hot water determination means, from the past heat load data, from the remaining hot water state is a bathtub state detected by the bathtub state detection means, The cogeneration system according to claim 6, wherein the predicted heat load data is derived. When the heat load predicting means determines the presence of the remaining hot water by the remaining hot water determining means, the predicted heat load data is obtained from the past heat load data with the remaining hot water when the presence of the remaining hot water is determined in the past. If the remaining hot water determination means determines the absence of the remaining hot water, the predicted heat load data is derived from the remaining hot water no past heat load data when the absence of the remaining hot water is determined in the past. The cogeneration system according to claim 6. A bathtub state detecting means capable of detecting a bathtub state related to the water level and the water temperature in the bathtub,
In the case where the heat load prediction means determines the presence of the remaining hot water by the remaining hot water determination means, when the presence of the remaining hot water is determined in the past, the past heat load data with the remaining hot water and the bathtub state detection The cogeneration system according to claim 8, wherein the predicted heat load data is derived from a remaining hot water state that is a bathtub state detected by the means.

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