JP2001248907A - Cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent run out of hot water due to variation in the quantity of hot water actually remaining in a bathtub at the time of filling the bathtub with hot water while enhancing energy saving and economy. SOLUTION: When hot water is supplied into a bathtub from a tank for storing hot water under such a state as forming a thermal stratification, the quantity of hot water actually remaining in the bathtub (actual quantity of hot water) is measured by a means 21 for measuring actual quantity of hot water, and the quantity of hot water stored in the hot water storage tank is determined by a means 25 for detecting the quantity of stored hot water. The quantity of hot water storable in the hot water storage tank is then determined based on the actual quantity of hot water and the quantity of hot water stored in the hot water storage tank, and a decision is made whether operation of an exhaust heat heating means 1 for attaining the storable quantity of hot water is effective or not from the aspect of energy saving and economy. If it is effective, signals for allowing operation of a heat/power cogenerator and a circulation pump are delivered simultaneously with hot water supply from a hot water filling means, thus obtaining hot water using exhaust heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage tank in a state where temperature stratification is formed by utilizing exhaust heat generated by an integrated generator and gas engine or a cogeneration system such as a fuel cell. The present invention relates to a cogeneration system configured to store hot water and supply hot water in a hot water storage tank to a bath.

[0002]

2. Description of the Related Art This type of apparatus is configured to store a required minimum amount of hot water in a hot water storage tank so as to minimize heat radiation in proportion to the amount of hot water stored. However, in order to cope with a case where a large amount of hot water is supplied, such as filling a bathtub, it is necessary to always maintain a certain amount of hot water storage.

Therefore, as shown in Japanese Patent Publication No. 5-81811 (JP-A-61-55545),
There is a time zone in which a large amount of hot water is set, such as filling a bathtub, and the amount of hot water stored is increased in that time zone, and the amount of hot water stored is reduced in other time zones.

Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 4-324057, a temporal change of a hot water supply load is learned as a hot water supply load pattern, and heating control by a boiler is performed so as to match the hot water supply load pattern. There is.

[0005]

However, in the above-described conventional example, it is not determined whether there is remaining hot water in the bathtub and how much the remaining hot water is, based on the actual amount. Due to the presence or absence of hot water and fluctuations in the amount of hot water, there is a drawback that hot water is stored needlessly, or conversely, hot water runs short.

In the case of utilizing the exhaust heat from the cogeneration system, since the casing of the cogeneration system is large, the exhaust heat generated during the startup from the start of operation to a predetermined time is reduced by the case and the exhaust heat. The amount of exhaust heat that can be absorbed and absorbed by the piping that supplies air is small.

When the heating is performed in such a state that the amount of exhaust heat is small, there is a disadvantage that the original energy saving and economic efficiency, which are the objectives of utilizing the exhaust heat, are impaired.

[0008] The present invention has been made in view of such circumstances, and the invention according to claim 1 is caused by fluctuations in the actual amount of remaining hot water in a bathtub when filling. It is an object of the present invention to prevent running out of hot water and improve energy saving and economy.
When the required amount of hot water to be stored in the hot water storage tank at a specific time is specified in advance by a learning function, a reservation setting, or the like, the required amount of hot water is secured after completion of hot water filling to avoid running out of water and wasteful hot water storage. It is another object of the present invention to reduce the amount of hot water stored in the hot water storage tank and reduce heat dissipation while improving energy saving and economic efficiency. It is intended to be able to suppress the.

[0009]

The invention according to claim 1 is
In order to achieve the object as described above, a hot water storage tank for storing hot water in a state of forming a temperature stratification by attaching a circulation pipe taken out from the lower part and supplying it from the upper part, and a hot water storage tank provided in the circulation pipe, A heating means for heating the water taken out, a circulation pump provided in the circulation pipe for taking out water from the hot water storage tank and supplying hot water after heating to the hot water storage tank; A hot water supply means for supplying hot water in the hot water storage tank into the bath tub in response to a signal, wherein the heating means includes at least a waste heat heating means having a waste heat of the combined heat and power supply as a heat source. Hot water storage amount detection means provided in the hot water storage tank for detecting the amount of hot water stored in the hot water storage tank, and hot water setting for setting the amount of hot water stored in the bathtub A step, actual hot water quantity measuring means for measuring the actual hot water quantity stored in the bathtub, and in response to the hot water filling signal, the actual hot water quantity measured by the hot water quantity measuring means from the hot water quantity set by the hot water setting means. A required hot water amount calculated by the required hot water amount calculated by the required hot water amount calculated by subtracting the actual hot water amount from the actual hot water amount to calculate a required hot water amount; A remaining hot water amount calculating means for calculating the remaining amount of hot water in the hot water storage tank by subtracting the tension amount; and a remaining hot water amount calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank. The hot water storage capacity calculating means for calculating the hot water storage capacity in the tank, the hot water storage capacity calculated by the hot water storage capacity calculating means, and a waste heat priority set value sufficient to take advantage of the characteristics of the cogeneration system are compared. The amount of hot water that can be stored Comparing means for issuing a waste heat priority signal when the pressure is greater, and supplying an operation permission signal for the waste heat heating means and the circulation pump in response to the waste heat priority signal from the comparison means to supply hot water by the hot water filling means. And heating control means for outputting an output at the same time or almost at the same time and stopping the operation permission signal after heating for the amount of hot water that can be stored.

Here, the exhaust heat priority setting value sufficient to take advantage of the characteristics of the cogeneration system is set according to the cogeneration system used. That is, the exhaust heat recovery efficiency and the power generation efficiency are obtained from the temperature rise state of the exhaust heat from the start of operation due to the volume of the housing and the continuous operation time after the start, and energy saving and economic efficiency are obtained from them. A value obtained by converting the continuous operation time as a whole, which is useful from the viewpoint, into the amount of hot water is set as the exhaust heat priority setting value (the same applies hereinafter).

According to a second aspect of the present invention, there is provided a hot water storage tank for storing hot water in a state of forming a temperature stratification by attaching a circulation pipe taken out from a lower part and supplied from an upper part to achieve the above object. Heating means provided in the circulation pipe to heat water taken out of the hot water storage tank,
A circulating pump provided in the circulation pipe to take out water from the hot water storage tank and supply heated water to the hot water storage tank; and a circulating pump connected to the hot water storage tank and connected to the hot water storage tank to respond to a hot water filling signal. A cogeneration system including hot water filling means for supplying hot water into the bathtub, wherein the heating means includes at least exhaust heat heating means using heat exhausted from the combined heat and power supply device as a heat source, and into the hot water storage tank at a specific time. The required hot water storage amount is specified in advance, and in response to the hot water filling signal, the remaining hot water amount calculated by the remaining hot water amount calculation means from the required hot water storage amount at the time when the supply of hot water by the hot water filling means is stopped. Additional hot water storage amount calculating means for calculating the additional hot water storage amount to the hot water storage tank by subtracting the remaining amount,
Comparing the additional hot water storage amount calculated by the additional hot water storage amount calculation means with the exhaust heat priority setting value and issuing a second exhaust heat priority signal when the additional hot water storage amount is larger than the exhaust heat priority setting value. A comparison means and, in response to a second waste heat priority signal from the second comparison means, the operation permission signal for the waste heat heating means and the circulation pump is simultaneously or almost simultaneously supplied with hot water by the hot water filling means. A second heating control means for outputting and heating the additional hot water storage amount and then stopping the operation permission signal is provided.

The required amount of hot water to be stored in the hot water storage tank at a specific time is specified in advance by, for example, a learning function for specifying the required amount of hot water on the same day of the previous day or one week before, or a reservation function. For example, it is specified by the fluctuation pattern of the required hot water storage amount set by the schedule timer.

According to a third aspect of the present invention, there is provided a hot water storage tank for storing hot water in a state of forming a temperature stratification by attaching a circulation pipe taken out from a lower part and supplied from an upper part to achieve the above object. Heating means provided in the circulation pipe to heat water taken out of the hot water storage tank,
A circulating pump provided in the circulation pipe to take out water from the hot water storage tank and supply heated water to the hot water storage tank; and a circulating pump connected to the hot water storage tank and connected to the hot water storage tank to respond to a hot water filling signal. A cogeneration system including hot water filling means for supplying hot water into the bathtub, wherein the heating means includes at least exhaust heat heating means using heat exhausted from the combined heat and power supply device as a heat source, and into the hot water storage tank at a specific time. The required amount of hot water stored in the hot water storage tank is specified in advance, and a hot water storage amount detecting means provided in the hot water storage tank for detecting the amount of hot water stored in the hot water storage tank, and a hot water setting for setting the amount of hot water stored in the bathtub Means, actual hot water quantity measuring means for measuring the actual hot water quantity stored in the bathtub, and in response to the hot water signal, whether or not the hot water quantity set by the hot water setting means. A required hot water amount calculating means for subtracting an actual hot water amount measured by the actual hot water amount measuring means to calculate a required hot water amount; and the required hot water amount based on the hot water storage amount detected by the hot water storage amount detecting means. The remaining hot water amount calculating means for calculating the remaining amount of hot water in the hot water storage tank by subtracting the required hot water filling amount calculated by the calculating means, and the remaining hot water amount calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank Means for calculating the amount of hot water that can be stored in the hot water storage tank by subtracting the remaining amount; and, in response to a hot water signal, the required hot water amount at the time when the hot water supply is stopped by the hot water means. Additional hot water storage amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means to calculate an additional hot water storage amount in the hot water storage tank, and the hot water storable hot water amount calculated by the hot water storable hot water amount calculating means and the addition The additional water calculated by the hot water storage A third comparing means for comparing the hot water storage quantity and selecting and outputting the smaller hot water quantity, and comparing the hot water quantity selected and output by the third comparing means with the exhaust heat priority setting value to determine the hot water quantity; A fourth comparing means for issuing a third heat-exit priority signal when the heat-exhaust heat priority is larger than the heat-exhaust priority set value;
In response to the third exhaust heat priority signal from the fourth comparing means, the operation output signal for permitting operation of the exhaust heat heating means and the circulation pump is output simultaneously or almost simultaneously with the supply of hot water by the hot water filling means. Third heating control means for stopping the operation permission signal after heating the smaller amount of the available hot water amount or the additional hot water storage amount is provided.

[0014]

According to the configuration of the cogeneration system according to the first aspect of the present invention, for example, an operation for supplying hot water to the bath tub is artificially performed, or the bath tub is automatically opened by a reservation function or a learning function. When a hot water supply signal for supplying hot water is output, the required hot water is calculated from the amount of hot water actually stored in the bathtub, that is, the amount of remaining hot water in the bathtub (actual hot water amount) and the set hot water amount to be stored. Calculate the tension amount. On the other hand, the required amount of hot water is subtracted from the amount of hot water stored in the hot water storage tank to obtain the remaining amount of hot water after hot water filling, and the remaining hot water amount is subtracted to obtain the amount of hot water that can be stored in the hot water storage tank. Compare the obtained hot water storage hot water amount and the waste heat priority setting value, when operating the exhaust heat heating means to obtain the hot water storage hot water amount,
It judges whether it is useful from the viewpoint of energy saving and economic efficiency, and when it is judged useful, outputs an operation permission signal simultaneously with the supply of hot water by the hot water filling means to permit the operation of the exhaust heat heating means and the circulation pump. In addition, hot water can be obtained by exhaust heat while ensuring usefulness in terms of energy saving and economy.

According to the configuration of the cogeneration system according to the second aspect of the present invention, when the required amount of hot water to be stored in the hot water storage tank at a specific time is specified in advance by a learning function, a reservation function, or the like, a bathtub is provided. When a hot water signal is supplied to supply hot water to the inside, when hot water for washing or drying dishes is needed, subtract the remaining hot water in the hot water storage tank from the required hot water storage amount to obtain the additional hot water storage amount. Ask. Compare the obtained additional hot water storage amount and the exhaust heat priority set value,
When the exhaust heat heating means is operated to obtain the additional hot water storage, it is determined whether or not it is useful from the viewpoint of energy saving and economic efficiency. By outputting an operation permission signal, the operation of the exhaust heat heating means and the circulation pump is permitted, and hot water can be obtained by exhaust heat while ensuring usefulness in terms of energy saving and economy.

According to the configuration of the cogeneration system of the third aspect of the present invention, when both the obtained hot water storage capacity and the additional hot water storage capacity are larger than the exhaust heat priority setting value, the smaller hot water capacity is obtained. To obtain hot water by exhaust heat.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a cogeneration system according to the present invention, in which a combined heat and power supply device 1 and a hot water storage device 2 configured to drive a generator by a gas engine include jacket cooling water. It is connected via the circulation pipe 3 and the first heat exchanger 4, and is configured such that waste heat from the cogeneration system 1 can be used for hot water storage, hot water supply, and heating. The jacket cooling water circulation pipe 3 and the first heat exchanger 4 are used to utilize the exhaust heat from the cogeneration system 1 and are referred to as exhaust heat heating means (see FIGS. 2, 3 and 4 described later). In each case, for convenience, the drawing numbers of the exhaust heat heating means are the same as those of the cogeneration system 1).

The hot water supply unit 2 includes a hot water storage tank 5, an auxiliary heat source unit 6, and a makeup water tank 7. A circulation pipe 9 provided with a circulation pump 8 is provided from the lower part to the upper part of the hot water storage tank 5, and the first heat exchanger 4 and the auxiliary heat source device 6 are provided in series in the circulation pipe 9.

With the above configuration, water is taken out from the lower part of the hot water storage tank 5 and heated by the exhaust heat from the cogeneration unit 1, and the heated water is supplied from the upper part of the hot water storage tank 5 to form a temperature stratification. Hot water is stored in the state.

The circulation pipe 9 is provided with a flow sensor 10 and a flow control valve 11. The auxiliary heat source device 6 is configured to perform combustion heating with city gas as a dedicated heat source having a high heating capacity, and is used by the auxiliary heat source device 6 when heating by the exhaust heat from the cogeneration device 1 is not performed or in combination. It is configured to perform heating to obtain hot water for hot water storage, hot water supply and heating. The heating means for heating the water taken out of the hot water storage tank 5 is constituted by the exhaust heat heating means and the auxiliary heat source device 6.

An output circulation pipe 13 is connected to the circulation pipe 9 in parallel with the first heat exchanger 4 and the auxiliary heat source unit 6.
The output circulation pipe 13 is provided with a heat exchanger 14 for heating and a heat exchanger 15 for reheating.

The heating heat exchanger 14 has a makeup water tank 7
The first pipe 16 with a pump is connected in a state where it is connected to the first pipe 16 with a pump.
A floor heater, an indoor heater, a bathroom dryer, and the like (not shown) are connected via a return header 18.

A bath 20 is connected to the reheating heat exchanger 15 via a second pipe 19 with a pump, so that reheating is performed. 2nd piping with pump 1
9 is provided with a pressure sensor 21 as an actual hot water amount measuring means for measuring an actual hot water amount stored in the bathtub 20.

A hot water supply pipe 22 is connected to the hot water storage tank 5 in parallel with the circulation pipe 9 and the output circulation pipe 13.
2, a distribution valve 22a, a flow control valve 22b, a flow sensor 22
c and an on-off valve 22d are provided, and the hot water supply pipe 22 is connected to the second pump-equipped pipe 19.
Thereby, the hot water filling means is configured so that hot water at a desired temperature can be supplied from the hot water storage tank 5 into the bathtub 20 via the hot water supply pipe 22 and the second pipe 19 with the pump.

A shower pipe 22e connected to a shower is connected at an intermediate point of the hot water supply pipe 22. A water supply pipe 23 is connected to the distribution valve 22a, so that the temperature of the hot water at the time of filling can be adjusted by adjusting the distribution ratio between the amount of hot water and the amount of water supply.

The hot water storage tank 5 is vertically spaced
Temperature sensors 24a, 24b, 24c, 24d, 24
e is provided, and a hot water storage amount detecting means 25 (see FIG. 2) configured to detect a hot water storage amount in the hot water storage tank 5 based on a position of a temperature sensor that senses a set temperature such as 80 ° C., for example.

A touch panel attached to a side wall of a bathroom (not shown) is provided with a hot water setting means 26 (see FIG. 2) for setting the hot water stored in the bathtub 20.
The on / off valve 22d is automatically closed when the amount of hot water stored in the bathtub 20 reaches the amount set by the hot water amount setting means 26.

As shown in the block diagram of the first embodiment in FIG. 2, the actual hot water amount measuring means (pressure sensor) 21, the hot water storage amount detecting means 25, and the hot water setting means 26 are provided by a microcomputer 27.
The microcomputer 27 is connected to the cogeneration system 1, the circulating pump 8, and the opening / closing valve 2 constituting the filling means.
2d is connected.

The microcomputer 27 includes a required hot water filling amount calculating means 28, a remaining hot water amount calculating means 29, a storable hot water amount calculating means 30, a comparing means 31, and a heating control means 32.

The hot water supply operation can be performed by the touch panel described above so that the flow rate can be adjusted. A hot water filling signal is output in accordance with the hot water supply operation, and a hot water amount sensor 22c and a flow control valve 22b provided in the hot water supply pipe 22 are provided. Is configured to supply hot water at a set flow rate.

The required filling level calculating means 28 subtracts the actual hot water quantity measured by the actual hot water quantity measuring means 21 from the hot water quantity set by the hot water quantity setting means 26 in response to the hot filling signal, and Is calculated. The remaining hot water amount calculation means 29 subtracts the required hot water amount calculated by the required hot water amount calculation means 28 from the hot water storage amount detected by the hot water storage amount detection means 25 to determine the remaining amount of hot water in the hot water storage tank 5. It is to be calculated. The storable hot water amount calculating means 30 calculates the storable hot water amount in the hot water storage tank 5 by subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means 29 from the total capacity of the hot water storage tank 5.

The comparing means 31 is a means 3 for calculating the amount of hot water that can be stored.
The hot water storable amount calculated at 0 is compared with the exhaust heat priority set value, and when the hot water storable amount is larger than the exhaust heat priority set value, an exhaust heat priority signal is output. The exhaust heat priority setting value is set according to the cogeneration system 1 to be used so as to make full use of the characteristics of the cogeneration system 1. In other words, the exhaust heat recovery efficiency and the power generation efficiency are obtained from the rising state of the temperature of the exhaust heat from the start of operation due to the volume of the casing constituting the cogeneration system 1 and the continuous operation time after the start, and from these, The continuous operation time as a whole that is useful in terms of energy saving and economy is set as the exhaust heat priority setting value.

The heating control means 32 outputs an operation permission signal for the cogeneration system 1 and the circulating pump 8 in response to the exhaust heat priority signal from the comparing means 31 and simultaneously opens and closes the on-off valve 2.
2d is opened to start supplying hot water, and after heating for the amount of hot water that can be stored, the operation permission signal is stopped.

With the above-described configuration, after the waste heat priority signal is input and the operation of the combined heat and power supply device 1 is started, the heating control means 32 sets the waste heat priority set value even if the filling is completed. The operation is continued for the performed continuous operation time, so that energy saving and economy can be improved.

As the driving operation in response to the above-mentioned driving permission signal, one of the following two modes is adopted. This is the same in the following embodiments. The combined heat and power supply device 1 and the circulation pump 8 are operated in response to the operation permission signal. In response to the operation permission signal, it is determined whether the power load is larger than a predetermined set value. If the power load is larger than the set value, the combined heat and power supply device 1 and the circulation pump 8
If the power load is smaller than the set value, the power generated by the co-generation device 1 is not consumed and is wasted and wasted.
The economy is improved by not operating the cogeneration system 1 and the circulation pump 8.

FIG. 3 is a block diagram showing the second embodiment. The difference from the first embodiment is as follows. That is, in addition to the configuration of the first embodiment, an additional hot water storage amount calculating means 33, a second comparing means 34, and a second heating control means 35 are provided. The additional hot water storage amount calculating means 33 is specified by, for example, a learning function, such as a fluctuation pattern of the required hot water storage amount on the same day of the previous day or one week before, or a fluctuation pattern of the required hot water storage amount set by a schedule timer such as a reservation function. The required amount of hot water to be stored in the hot water storage tank at a specific time is input, and the additional hot water storage amount calculating means 33 responds to the hot water signal to stop the supply of hot water to the bathtub 20. The remaining amount of hot water calculated by the remaining hot water amount calculating means 29 is subtracted from the remaining hot water amount to calculate an additional hot water storage amount in the hot water storage tank 5.

The second comparing means 34 compares the additional hot water storage amount calculated by the additional hot water storage amount calculating means 33 with the above-mentioned waste heat priority setting value, and when the additional hot water storage amount is larger than the waste heat priority setting value. A second exhaust heat priority signal is issued.

The second heating control means 35 outputs an operation permission signal for the combined heat and power supply apparatus 1 and the circulation pump 8 in response to the second exhaust heat priority signal from the second comparing means 34, and simultaneously opens and closes the on-off valve. The operation permission signal is stopped after the supply of hot water is started by opening 22d and heating for the amount of hot water that can be stored is performed.

With the above configuration, the second heating control means 3
In 5, after the exhaust heat priority signal is input and the operation of the combined heat and power supply device 1 is started, the operation continues for the continuous operation time set as the exhaust heat priority set value even if the filling is completed. , Energy saving and economy can be improved.

FIG. 4 is a block diagram showing the third embodiment. The difference from the second embodiment is as follows. That is, in addition to the configuration of the second embodiment, the third and fourth comparing means 41 and 42 and the third heating control means 4
3 are provided.

The third comparing means 41 compares the storable hot water amount calculated by the storable hot water amount calculating means 30 with the additional hot water storage amount calculated by the additional hot water storing amount calculating means 33, and selects a smaller hot water amount. Output.

The fourth comparing means 42 is provided by the third comparing means 4.
The smaller amount of hot water selected and output in step 1 is compared with the above-mentioned exhaust heat priority set value, and a third exhaust heat priority signal is issued when the amount of hot water is larger than the exhaust heat priority set value. .

The third heating control means 43 outputs an operation permission signal for the combined heat and power supply apparatus 1 and the circulation pump 8 in response to the third exhaust heat priority signal from the fourth comparing means 42, and simultaneously opens and closes the on-off valve. 22d is opened to start supplying hot water, and after the smaller of the hot water storage capacity and the hot water storage capacity is heated, the operation permission signal is stopped.

According to the configuration of the third embodiment, when both of the hot water storage capacity and the additional hot water capacity are larger than the exhaust heat priority setting value, the smaller hot water quantity is selected. , The amount of hot water stored in the hot water storage tank 5 can be reduced, loss due to heat radiation can be suppressed, and economic efficiency can be improved.

[0045]

As is clear from the above description, according to the cogeneration system of the first aspect of the present invention, the actual hot water amount actually stored in the bathtub, that is,
Along with measuring the amount of hot water remaining in the bathtub, the amount of hot water stored in the hot water storage tank is detected, and the amount of hot water that can be stored is determined based on the actual hot water amount in the bathtub and the hot water storage amount in the hot water storage tank, Since heating is controlled based on the amount of hot water that can be stored, running out of hot water due to fluctuations in the actual amount of remaining hot water in the bathtub can be prevented. Moreover, when the amount of hot water that can be stored is compared with the set value of exhaust heat priority, and when the exhaust heat heating means is operated to obtain the amount of hot water that can be stored, when it is determined that it is useful in terms of energy saving and economic efficiency, Since hot water can be obtained by exhaust heat, energy saving and economic efficiency can be improved.

According to the cogeneration system of the present invention, when the required amount of hot water to be stored in the hot water storage tank at a specific time is specified in advance by a learning function, a reservation function, or the like, the hot water is stored in the bathtub. When the hot water signal is supplied, the remaining hot water in the hot water storage tank is subtracted from the required hot water storage amount to determine the additional hot water storage amount, and the heating control is performed based on the additional hot water storage amount. It is possible to avoid running out of hot water and wasteful hot water storage.
Moreover, comparing the additional hot water storage amount with the waste heat priority setting value, when operating the exhaust heat heating means to obtain the additional hot water storage, when it is determined that it is useful in terms of energy saving and economic efficiency Because hot water can be obtained by exhaust heat,
Energy saving and economy can be improved.

According to the cogeneration system of the third aspect of the present invention, when both the obtained hot water storage capacity and the additional hot water storage capacity are larger than the waste heat priority setting value, the cogeneration system is based on the smaller hot water capacity. Since hot water can be obtained by exhaust heat, the amount of hot water stored in the hot water storage tank after completion of heating can be reduced, heat loss can be suppressed, and energy saving and economy can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cogeneration system according to the present invention.

FIG. 2 is a block diagram showing a first embodiment.

FIG. 3 is a block diagram showing a second embodiment.

FIG. 4 is a block diagram showing a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cogeneration system 4 ... 1st heat exchanger 6 ... Auxiliary heat source device 8 ... Circulation pump 9 ... Circulation piping 20 ... Bathtub 21 ... Pressure sensor as actual hot water measuring means 22 ... Hot water supply pipe (hot water filling means) 22d ... Opening / closing valve (hot water filling means) 25 hot water storage amount detecting means 26 hot water amount setting means 28 required hot water amount calculating means 29 residual water amount calculating means 30 hot water storage hot water amount calculating means 31 comparing means 32 heating control means 33 Additional hot water storage calculating means 34 Second comparing means 35 Second heating controlling means 41 Third comparing means 42 Fourth comparing means 43 Heating controlling means selecting means

Continued on the front page (72) Inventor Shin Iwata 4-1-2, Hirano-cho, Chuo-ku, Osaka City Inside Osaka Gas Co., Ltd. (72) Keiji Takimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka City Osaka Gas Inside (72) Inventor Yutaka Yoshida 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi Inside Herman Co., Ltd. (72) Michihisa Suehira 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-Harman, Inc. (72) Inventor Hideaki Fujikawa 1-1-52 Oka, Minami-shi, Minato-ku, Osaka-shi F-term in Harman Co., Ltd. (Reference) 3L024 CC05 DD03 DD27 GG06 GG12 GG15 HH54 3L025 AA37 3L070 AA09 BB06 DD07 DE09 DF15 DG01 DG05

Claims (3)

[Claims] 1. A hot water storage tank for storing hot water in a state of forming a temperature stratification by attaching a circulation pipe taken out from a lower part and supplied from an upper part, and heating water taken out of the hot water storage tank provided in the circulation pipe. A heating means, a circulation pump provided in the circulation pipe to take out water from the hot water storage tank and supply heated water to the hot water storage tank, and a communication pump connected to the hot water storage tank and responding to a hot water signal, A cogeneration system comprising: a hot water supply means for supplying hot water in a hot water storage tank into the bath tub; wherein the heating means includes exhaust heat heating means using at least exhaust heat of the cogeneration unit as a heat source; Hot water storage amount detection means provided for detecting the amount of hot water stored in the hot water storage tank, hot water setting means for setting the amount of hot water to be stored in the bathtub, the bathtub Actual hot water quantity measuring means for measuring the actual hot water quantity stored in the hot water filling signal, and subtracting the actual hot water quantity measured by the real hot water quantity measuring means from the hot water quantity set by the hot water quantity setting means in response to the hot water filling signal. Required hot filling amount calculating means for calculating the required hot filling amount, and subtracting the required hot filling amount calculated by the required hot filling amount calculating means from the hot water storage amount detected by the hot water storage amount detecting means. Remaining hot water amount calculation means for calculating the remaining amount of hot water in the hot water storage tank; subtracting the remaining hot water amount calculated by the remaining hot water amount calculation means from the total capacity of the hot water storage tank, the amount of hot water that can be stored in the hot water storage tank Means for calculating the amount of hot water that can be stored and calculating the amount of hot water that can be stored calculated by the amount of hot water that can be stored and the waste heat priority setting value that makes use of the characteristics of the combined heat and power unit. If it is larger than the heat priority setting Comparing means for outputting a waste heat priority signal to the waste heat heating means and the circulating pump in response to the waste heat priority signal from the comparison means. A cogeneration system, comprising: heating control means for simultaneously outputting and heating the amount of hot water that can be stored, and then stopping the operation permission signal. 2. A hot-water storage tank for storing hot water in a state where temperature circulation is formed by attaching a circulation pipe to be taken out from a lower part and supplied from an upper part, and heating the water taken out of the hot-water storage tank provided in the circulation pipe. A heating means, a circulation pump provided in the circulation pipe to take out water from the hot water storage tank and supply heated water to the hot water storage tank, and a communication pump connected to the hot water storage tank and responding to a hot water signal, A cogeneration system comprising: a hot water supply means for supplying hot water in a hot water storage tank into a bath tub; wherein the heating means includes at least a waste heat heating means using a waste heat of a cogeneration unit as a heat source; The required amount of hot water to be stored in the hot water storage tank is specified in advance, and in response to the hot water signal, Additional hot water storage amount calculation means for subtracting the remaining amount of hot water calculated by the remaining hot water storage amount calculation means from the required hot water storage amount to calculate an additional hot water storage amount to the hot water storage tank, calculated by the additional hot water storage amount calculation means A second comparing means for comparing the additional hot water storage amount with the waste heat priority setting value and outputting a second waste heat priority signal when the additional hot water storage amount is larger than the waste heat priority setting value; and the second comparing means In response to the second exhaust heat priority signal from the controller, outputs the operation permission signal of the exhaust heat heating means and the circulation pump simultaneously or almost simultaneously with the supply of hot water by the hot water filling means, thereby heating the additional hot water storage amount. And a second heating control means for stopping the operation permission signal after the operation is performed. 3. A hot-water storage tank for storing hot water in a state where a temperature-stratified layer is formed by attaching a circulation pipe to be taken out from a lower part and supplied from an upper part; A heating means, a circulation pump provided in the circulation pipe to take out water from the hot water storage tank and supply heated water to the hot water storage tank, and a communication pump connected to the hot water storage tank and responding to a hot water signal, A cogeneration system comprising: a hot water supply means for supplying hot water in a hot water storage tank into a bath tub; wherein the heating means includes at least a waste heat heating means using a waste heat of a cogeneration unit as a heat source; The required amount of hot water stored in the hot water storage tank is specified in advance, and provided in the hot water storage tank to detect the amount of hot water stored in the hot water storage tank. Hot water storage amount detecting means, hot water amount setting means for setting the amount of hot water stored in the bathtub, actual hot water amount measuring means for measuring the actual hot water amount stored in the bathtub, and in response to the hot water filling signal, The required hot water amount calculating means for calculating the required hot water amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means from the hot water amount set by the hot water amount setting means, and the required hot water amount detected by the hot water storage amount detecting means. A remaining hot water amount calculating means for calculating a remaining amount of hot water in the hot water storage tank by subtracting a required hot water amount calculated by the required hot water amount calculating means from the hot water storage amount; Hot water storage amount calculation means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculation means to calculate the hot water storage capacity in the hot water storage tank; supply of hot water by the hot water filling means in response to a hot water signal Is the required amount of hot water at the time of shutdown? An additional hot water storage amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means to calculate an additional hot water storage amount to the hot water storage tank; and a hot water storable hot water amount calculated by the hot water storable hot water amount calculating means and Third comparing means for comparing the additional hot water quantity calculated by the additional hot water quantity calculating means and selecting and outputting the smaller hot water quantity; hot water quantity selected and output by the third comparing means and exhaust heat; A fourth comparing means for comparing with the priority setting value and outputting a third exhaust heat priority signal when the amount of hot water is larger than the exhaust heat priority setting value; and a third exhaust heat priority signal from the fourth comparing means. In response to the signal, an operation permission signal for the exhaust heat heating means and the circulation pump is output simultaneously or almost simultaneously with the supply of hot water by the hot water filling means, and the hot water amount which can be stored or the additional hot water amount is smaller. Operation permission signal is stopped after heating Third cogeneration system characterized in that a heating control means that.