JP2002364918A - Cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cogeneration system, in which efficiency of waste-heat equipment of a gas engine generator, etc., can be raised, and a temperature stratification can be easily formed in a hot-water storage tank. SOLUTION: The cogeneration system comprises a hot-water storage system 1, in which waste heat of the waste-heat equipment such as an engine generator 8, etc., is utilized for hot-water heating. In the hot-water storage system 1, there are provided a hot-water storage tank 101 for storing hot water, a hot-water storage heat-exchanger 124 for heating hot-water by heat-exchanging with the waste heat of the waste heat equipment of the engine generator, etc., a circulating pump 102 which sucks hot-water heated by the hot-water storage heat-exchanger, and delivering it to the tank so that a temperature stratification is formed, a water-volume control valve 107 for controlling the water-flow volume in the heat exchanger 124, and a bypass 126 for the hot-water storage tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation of a gas engine generator or a fuel cell generator using city gas, LP gas, or the like to generate electricity, and to use the heat generated as a by-product for the storage of hot water. It relates to the cogeneration system to be used.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a hot water supply type hot water supply apparatus as a modification of the conventional cogeneration system. In FIG. 2, 10 is a circulation path, 11 is a hot water storage tank for forming a temperature stratification therein, 12 is a circulation pump for circulating hot water, and 13 is a hot water storage tank 11 for discharging hot water from the circulation pump 12 via one pipe. A top three-way valve for sending to the other pipe, or a bottom three-way valve for sending water at the bottom of the hot water storage tank 11 to the circulation path 10 or forming a circulation path with the top three-way valve 13; 1
5 is a heat exchanger for exchanging the exhaust heat (condensation heat) of the outdoor unit of the air conditioner, 16 is a heat exchanger for exchanging the exhaust heat of the gas engine 20, 17 is an auxiliary heat source for heating the hot and cold water in the circulation path 10,
Reference numeral 18 denotes an indoor unit of an air conditioner, 19 denotes an outdoor unit incorporating a gas engine 20, a compressor 21 described below, and the like, and 21 denotes a compressor driven by the gas engine 20. A cogeneration system is a system that originally generates electricity and heat, but as shown in FIG.
Since 0 operates as a power source for driving the compressor 21 and a heat source for the heat exchanger 16, the apparatus of FIG. 2 can be said to be a modification of the cogeneration system.

The hot water storage operation of the hot water supply heat source device of the hot water storage type configured as described above will be described. Hot water storage tank 11
When storing the hot water heated therein, water at the bottom of the hot water storage tank 11 is taken out to the circulation path 10 by the bottom three-way valve 14, and the water is heated by the heat exchanger 15, the heat exchanger 16 and the auxiliary heat source 17. The heated hot water is returned to the upper portion of the hot water storage tank 11 by the upper three-way valve 13 to form a temperature stratification and store the hot water. However, FIG.
Of the cogeneration system, the circulation pump 12
All of the hot water discharged from the hot water flows into the hot water storage tank 11 via the upper three-way valve 13, so that no temperature stratification is formed in the hot water storage tank 11, and the auxiliary heat source 17 is used to prevent the inflow of low-temperature hot water. By using the gas engine 2
However, there was a problem that the energy efficiency of 0 decreased.
As one measure to solve this problem, the circulation path 10
A method of arranging a water amount control valve near the heat exchanger 15 to reduce the amount of hot water discharged from the circulation pump 12 can be considered.

[0004]

However, in the above-mentioned conventional cogeneration system, even if a water amount control valve is provided, the minimum water amount (resolution of the water amount control valve) that can be controlled by the water amount control valve is considerably large. Then, it is impossible to form a temperature stratification in the hot water storage tank 11,
In addition, there is a problem that the use of the auxiliary heat source 17 is unavoidable and energy efficiency is not good.

The present invention provides a cogeneration system capable of improving the utilization rate of a heat exhaust device such as a gas engine generator and easily forming a thermal stratification in a hot water storage tank in order to solve the above problems. The purpose is to:

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, a cogeneration system according to the present invention is a cogeneration system having a hot water storage system that uses exhaust heat of a heat exhaust device such as an engine generator for heating hot and cold water. So,
The hot water storage system includes a hot water storage tank that stores hot water, a hot water storage heat exchanger that heats hot water by performing heat exchange of exhaust heat from a heat exhaust device such as an engine generator, and a hot water that is heated by the hot water storage heat exchanger. It has a configuration having a circulation pump that sucks and discharges to the hot water storage tank so as to form a temperature stratification, a water flow control valve that controls the flow rate of the hot water storage heat exchanger, and a bypass path of the hot water storage tank. As a result, a cogeneration system that can improve the utilization rate of a heat exhaust device such as a gas engine generator and can easily form a thermal stratification in a hot water storage tank is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cogeneration system according to a first aspect of the present invention is a cogeneration system having a hot water storage system that uses exhaust heat of an exhaust heat device such as an engine generator for heating hot and cold water, The hot water storage system includes a hot water storage tank that stores hot water, a hot water storage heat exchanger that heats hot water by performing heat exchange of exhaust heat from a heat exhaust device such as an engine generator, and a hot water that is heated by the hot water storage heat exchanger. A circulating pump for inhaling and discharging to a hot water storage tank so as to form a temperature stratification;
A water flow control valve for controlling the flow rate of the hot water storage heat exchanger and a bypass for the hot water storage tank are provided.
With this configuration, the hot water discharged from the circulation pump can be bypassed to the bypass path of the hot water storage tank and the amount of hot water flowing into the hot water storage tank can be extremely small, so that the temperature stratification can be easily formed in the hot water storage tank, In addition, since the return hot water in the bypass passage can be heated again by passing it through the hot water storage heat exchanger, the waste heat of the heat exhaust device such as the gas engine generator can be used without waste and the utilization rate of the heat exhaust device can be improved. This has the effect of achieving the following.

According to a second aspect of the present invention, in the cogeneration system according to the first aspect, the bypass is a circulation path for passing hot water discharged from the circulation pump through the hot water storage heat exchanger again. It was decided that. With this configuration, since the return hot water in the bypass passage is heated again by the hot water storage heat exchanger, the exhaust heat of the heat exhaust device such as the gas engine generator can be used without waste to improve the efficiency of the heat exhaust device. It has the effect of being able to.

According to a third aspect of the present invention, in the cogeneration system according to the second aspect, the bypass path has a hot water storage valve for performing opening and closing operations, and the circulation pump is in an open state of the hot water storage valve. Most of the discharged hot water is bypassed to the hot water storage tank. With this configuration, the hot water discharged from the circulation pump can be bypassed to the bypass path of the hot water storage tank so that the amount of hot water flowing into the hot water storage tank can be extremely small (for example, the original discharge rate of the circulation pump can be reduced to 13 liters / minute). If the hot water storage tank inflow rate is 0.65 liters /
Min to 1.3 liters / min), which has the effect of easily forming a temperature stratification in the hot water storage tank.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a configuration diagram showing a cogeneration system according to Embodiment 1 of the present invention. FIG.
In the figure, 1 is a hot water storage system for forming a temperature stratification and storing hot water, and 2 is a hot water storage system 1 using exhaust heat of a gas engine generator (for example, using hot water from a water jacket).
, A floor heating system for performing floor heating, 4 a high-temperature heating system for performing high-temperature heating, 5 a bath heating system for performing heat exchange for additional heating of the bath, and 6. Is a bath reheating system that reheats a bath, 7 is a control device that controls the entire system, 8 is a heat rejection device that generates power and rejects heat using city gas, LP gas, or the like (that is, supplies electricity and heat together). As a gas engine generator, 9 is a bathtub, 31,
Reference numerals 32 and 35 denote on-off valves for opening and closing (on / off) operations, reference numerals 33 and 34 denote floors to which hot water is supplied and floor heating, and reference numeral 36 denotes a high-temperature heater such as a bathroom heating ventilator or a fan convector. .

The hot water storage system 1 includes a hot water storage tank 101, a circulation pump 102, a check valve 102a for preventing backflow, a hot water storage thermistor 103 to 106 for measuring the temperature of hot water, and a water flow control valve 107 for continuously controlling the flow of water. A water supply valve 108 for controlling on / off of water flow, a circulating hot water thermistor 109 for measuring the temperature of circulating hot water, baffles 110 and 111 for forming a temperature stratification, a heat supply side 124a and a heat receiving side 124b. Heat exchanger 124 consisting of circulating pump 10
Check valve 10 so as to bypass the hot water discharged from
It has a bypass 126 of the hot water storage tank 101 formed between the discharge side of 2a and the inflow side of the heat exchanger 124, and a hot water storage valve 125 arranged in the bypass 126. The engine exhaust heat system 2 includes an exhaust heat pump 201,
A hot and cold water tank 20 opened to the atmosphere so as not to exceed ℃
2, a heat exchanger 204 having a supply side 204a for supplying heat between the thermal three-way valve 203 and the floor heating system 3 and a heat receiving side 204b, an exhaust heat thermistor 205, and power generation of the gas engine generator 8. When a surplus occurs in the capacity, a surplus power recovery heater 206 for recovering the surplus power and using the surplus power as a heat source, an outward path 207 from which hot water is discharged from the exhaust heat pump 201, and a flow from the gas engine generator 8. A return pipe 208 to which hot and cold water is supplied, and a bypass pipe 209 for forming a bypass when the detected temperature at the three-way valve 203 is low.
Having.

Further, the floor heating system 3 includes a heating pump 3
01, the heat supply side 302a arranged on the high-temperature heating system 4 side
And a heat receiving side 302b disposed on the side of the floor heating system 3; a heat exchanger 302; a heating outward thermistor 303; a bypass pipe 304; a heating return thermistor 305; . Further, the high-temperature heating system 4 includes an auxiliary heat source 401 having a directional water flow sensor (a directional water flow sensor, not shown), a heating thermistor 402, and an on / off heating valve for operating the high-temperature heating system 4. 403, a heating make-up water valve 404 for supplying hot water when the water level in the hot water tank 306 falls
Having. Further, the bath heating system 5 has a heat supply side 50.
1a and a heat exchanger 501 comprising a heat receiving side 501b;
It has a bath valve 502 for ON / OFF operation for operating the bath heating system 5. Further, the bath reheating system 6 includes a bath circulation pump 601 and an outgoing port 60 for supplying hot water to the bathtub 9.
2. A return port 603 for supplying hot water from the bathtub 9, a hot water supply pipe 604 for supplying hot water from the hot water storage system 1, and a bath circulation thermistor 605 for measuring the temperature of hot water circulating between the bathtub 9 Having.

Further, the hot water supply system 9A includes check valves 115, 116 and 122 for preventing backflow, a water amount control valve 113 for continuously controlling the amount of flowing water, a filling valve 114 for performing on / off control of flowing water, Hot water from hot water storage tank 101 and water supply port 118
It has a mixing valve 112 for mixing water from the water, a hot water supply port 117, a pressure reducing valve 119 for adjusting pressure, a water supply thermistor 120 for measuring water supply temperature, a water amount sensor 121 for measuring water amount, and a water outlet 123. Here, the temperature of each part will be described. The temperature of the hot water supplied from the gas engine generator 8 to the heat exchanger 124 is about 75 to 80 ° C.
The temperature of the hot water supplied to 4 is about 60 to 70 ° C. The temperature of the hot water supplied from the auxiliary heat source 401 to the heat exchangers 302 and 501 is about 80C to 85C.

The operation of the cogeneration system configured as described above will be described. First, the operation of hot water storage system 1 and hot water supply system 9A will be described. In the hot water storage operation, the hot water storage pump 102 is driven by a motor (not shown), the heat exchanger 124 performs heat exchange, the water supply valve 108 is in an open state (on state), and the water amount control valve 107 is in a hot water storage tank. The opening of the hot water storage tank 101 is controlled so that the amount of hot water flowing into the hot water storage tank 101 from the upper portion of the hot water storage 101 becomes an appropriate amount. The hot water heated and exchanged by the heat exchanger 124 is supplied from the circulation pump 102 to the hot water storage tank 101 via the circulation hot water thermistor 109, and circulates in the order of the water amount control valve 107 → the water supply valve 108 → the heat exchanger 124. This circulation pump 102 → hot water storage tank 10
1 → Water control valve 107 → Water supply valve 108 → Heat exchanger 124
Is referred to as a first circulation path. The amount of water supplied from the circulation pump 102 to the hot water storage tank 101 is controlled by the opening of the water amount control valve 107. In order to form a temperature stratification in the hot water storage tank 101, for example, a 1 kW generator generates about 3 kW of heat. However, it is controlled to about 50 liters / hour. In order to improve this control ability to, for example, about 10 liters / hour, it is bypassed by the hot water storage valve 125. The hot water storage valve 125 forms a circulation path (second circulation path) together with the circulation pump 102, the heat exchanger 124, the bypass path 126, and the like. The valve 108 is closed (off state) to form only the second circulation path, and waits for a temperature rise by the heat exchanger 124. When the amount of hot water stored in hot water storage tank 101 decreases due to opening of hot water supply port 117 or hot water filling valve 114, the water supply pressure from water supply port 118 becomes relatively higher than the water pressure at the bottom of hot water storage tank 101, and the water supply increases. Done. Water inlet 118
Is supplied via a pressure reducing valve 119, a water amount sensor 121, and the like.

At the time of hot water supply, the hot water in the hot water storage tank 101 is in a state where the water supply valve 108 is opened, the hot water storage valve 125 is closed, and the heating make-up water valve bb404 is closed.
Hot water inlet 1 via mixing valve 112 and water quantity control valve 113
Supplied from 17. The auxiliary heat source 401 heats the water flow when the measured temperature of the hot water storage thermistor 103 and the like is low and the built-in water flow sensor detects the water flow. Therefore, when the temperature of hot water stored in hot water storage tank 101 is low, auxiliary heat source 40
The hot water heated in 1 is supplied from the hot water supply port 117, so that the supply of low-temperature hot water can be prevented. The filling valve 114 is a valve for filling.

Next, the engine exhaust heat system 2 will be described. Hot water (hot water of about 75 ° C. to 80 ° C.) from the gas engine generator 8 is supplied from the return port 208 to the surplus power recovery heater 2.
06 to the heat exchanger 124,
In the hot water storage system 1, heat is supplied. Heat exchanger 1
The hot water (hot water at about 65 ° C. to 70 ° C.) that has passed through the heat exchanger 24 reaches the low-temperature heating heat exchanger 204 and supplies heat to the floor heating system 3 in the heat exchanger 204. Thermal three-way valve 203
Hot water that has passed through the hot water (for example, 60 ° C.)
In the above case), the heat is discharged from the outward path 207 to the gas engine generator 8 side by the exhaust heat pump 201 via the open-type hot and cold water tank 202. Open water tank 202
Is for suppressing the temperature of hot water passing through to 100 ° C. or less. As a result, the temperature of the hot water in hot water storage system 1 becomes 100 ° C.
Is prevented from being exceeded. When the temperature of the hot water passing through the three-way valve 203 is low (for example, 60 ° C. or lower), the hot water from the gas engine generator 8 is supplied to the heat exchanger 12.
4 and 204, but via the bypass pipe 209. Thus, it is possible to prevent heat exchange with low-temperature hot and cold water, and to make the start-up time faster.

The relationship between the amount of hot water flowing into the hot water storage tank 101 and the amount of heat exhausted by the gas engine generator 8 will now be described. The amount of exhaust heat of the gas engine generator 8 is 2,580
× 4.18 kJ / hour, and when the water at a temperature of 15 ° C. flowing into the heat exchanger 124 flows out as hot water at a temperature of 67 ° C., the amount of hot water flowing in and out is 2,580 × 4.18.
kJ / hr {(67 ° C-15 ° C)} (4.18 kJ / litre) = 49.6 litres / hr = 0.83 litres / min. That is, when the amount of hot water flowing in and out of the heat exchanger 124 is, for example, 1.66 liter / minute, which is twice as high as 0.83 liter / minute, the temperature of the hot water flowing out of the heat exchanger 124 is 41 ° C. Become. This temperature is extremely insufficient for a water heater. As described above, the amount of hot water flowing into and out of the heat exchanger 124, that is, the amount of hot water flowing into the hot water storage tank 101, must be as small as 0.83 liter / minute. It is not possible to control such a small amount with the water amount control valve 107. That is, as described above, the control ability of the water amount control valve 107 is about 2 liters / minute, and control of 1 liter / minute or less is impossible.
The bypass path 126 is for enhancing the controllability of the water amount control valve 107, and flows hot water discharged from the circulation pump 102 into the hot water storage tank 101 by bypassing the bypass path 126 with the hot water storage valve 125 opened. The amount of hot and cold water can be made very small. For example, when the discharge rate of the circulation pump 102 is set to 13 liters / minute by controlling the water amount control valve 107 (the water supply valve 108 is opened at this time), 90% of the discharge amount of the circulation pump 102 is The amount is substantially 1.
It can be 3 liters / minute. Further, by circulating the hot water discharged from the circulation pump 102 through the bypass 126, the discharged hot water circulates through the second circulation path, and is heated to a sufficiently high heat by the heat exchanger 124, so that the gas engine generator 8 can increase the efficiency of waste heat utilization,
Therefore, the energy efficiency of the gas engine generator 8 can be improved. Specifically, when the discharge rate of the circulation pump 102 is set to 13 liter / min, the bypass 126
In most cases (for example, 90% to 9%).
5% (0.65 to 5
1.3 l / min)). The opening and closing control of the water amount control valve 107, the water supply valve 108, and the hot water storage valve 125 is performed by the control device 7 with the measured temperature of the circulating hot water thermistor 109 as a control target. That is, the control device 7
Means that the valves 107, 108 and 125 are controlled so that the temperature measured by the circulating water thermistor 109 becomes a constant temperature (for example, 67 ° C.). For example, when the measured temperature of the circulating hot water thermistor 109 is extremely low, the water supply valve 108 is closed (off) and the hot water storage valve 125 is open (on).
The hot water is circulated in the second circulation path so that the measured temperature of the circulating hot water thermistor 109 becomes a predetermined high temperature, and is heated by the heat exchanger 124 every time the hot water passes through the heat exchanger 124 in the second circulation path. To

Next, the floor heating system 3 will be described. Hot water from the heating pump 301 receives heat from the engine exhaust heat system 2 at the heat exchanger 204 and reaches the heat exchanger 302.
The heat exchanger 302 is for performing high-temperature heating,
In the case of low-temperature floor heating, hot water passes through the heat exchanger 302 without heat exchange, and is discharged from the outward port 307 via the heating outward path thermistor 303. On the floor side, if the on-off valve 31 is on, it is supplied to the floor 33, and if the on-off valve 32 is on, it is supplied to the floor 34. Hot water supplied from the return port 308 via the floor is supplied to the heating return thermistor 30.
5. Via the hot and cold water tank 306, the heating pump 30
1 is discharged. The bypass pipe 304 is connected to the on-off valve 31, 3
This prevents the temperature of the hot water exchanged by the heat exchangers 204 and 302 from being undetectable when both of them are in the OFF state. When the water level in the hot and cold water tank 306 is equal to or lower than a predetermined water level, hot water is supplied from the heating make-up water valve 404 to the hot and cold water tank 306.

Next, the high-temperature heating system 4 for performing high-temperature heating will be described. The high-temperature heating system 4 starts operating when the heating valve 403 is turned on. When the heating valve 403 is turned on, a circulation path of the circulation pump 102 → the auxiliary heat source 401 → the high-temperature heating heat exchanger 302 → the heating valve 403 is formed, and the measured temperature of the heating thermistor 402 is equal to or lower than a predetermined temperature (for example, 80 ° C.). In such a case, the auxiliary heat source 401 operates to heat the hot and cold water. In the heat exchanger 302, heat is supplied to the floor heating system 3, and the high-temperature heater 3 is opened by opening the on-off valve 35.
High-temperature hot water is passed through 6 to enable high-temperature heating.

Next, the bath heating system 5 for performing heat exchange for additional heating of the bath will be described. The bath heating system 5 starts operating when the bath valve 502 is turned on. Bath valve 502
Is turned on, the circulation pump 102 → the auxiliary heat source 401 →
A circulation path of the heat exchanger 501 for additional bath heating → the bath valve 502 → the heat exchanger 124 for hot water storage is formed, and the heating thermistor 40 is formed.
When the measured temperature of Step 2 is equal to or lower than a predetermined temperature (for example, 60 ° C.), the auxiliary heat source 401 operates, heat is supplied in the heat exchanger 501, and additional heating of the bath is performed.

Next, a bath reheating system 6 for reheating a bath will be described. Hot water discharged from the bath circulation pump 601 receives heat from the heat exchanger 501 for additional heating of the bath, is heated, and is supplied to the bathtub 9 from the outward path 602. The hot water returned from the bathtub 9 returns to the bath circulation pump 601 via the bath circulation thermistor 605. Bath circulation thermistor 60
When the measured temperature of 5 becomes lower than a predetermined temperature (for example, 40 ° C.), it is possible to automatically perform additional heating. The filling tube 604 is for filling with hot water from the filling valve 114 of the hot water storage system 1. In the present embodiment, the gas engine generator 8 is described as generating heat and electricity. However, the present invention is not limited to this, and can be similarly applied to a fuel cell that also generates heat and electricity. The same effect is achieved.

As described above, according to the present embodiment, the hot water storage system 1 performs the heat exchange of the exhaust heat of the exhaust device such as the engine 8 with the hot water storage tank 101 for storing the hot water, and the hot water storage system for heating the hot water. Heat exchanger 124, a circulating pump 102 that draws in the hot water heated by hot water storage heat exchanger 124 and discharges it to hot water storage tank 101 so as to form a temperature stratification, and controls a flow rate of hot water storage heat exchanger 124. Having the water amount control valve 107 and the bypass 126 of the hot water storage tank 101, the hot water discharged from the circulation pump 102 can be stored in the hot water storage tank 10.
1 hot water storage tank 101
The amount of hot and cold water flowing into can be extremely small,
Since the temperature stratification can be easily formed in the hot water storage tank 101 and the return hot water in the bypass 126 can be again passed through the hot water storage heat exchanger 124 and heated, the exhaust heat of the gas engine generator 8 and the like can be obtained. The utilization rate of the heat exhaust device can be improved by using the exhaust heat of the device without waste. Furthermore, the bypass passage 126 has a hot water storage valve 125 that performs opening and closing operations, and most of the hot water discharged from the circulation pump 102 (for example, 90% to 9%) when the hot water storage valve 125 is open.
5%) to the hot water storage tank 101, thereby bypassing hot water discharged from the circulation pump 102 to the bypass passage 126 of the hot water storage tank 101.
Since the amount of hot and cold water flowing into the fuel tank 01 can be extremely small, a temperature stratification can be easily formed in the hot water storage tank 101.

[0023]

As described above, according to the cogeneration system according to the first aspect of the present invention, a cogeneration system having a hot water storage system for utilizing the exhaust heat of a heat exhaust device such as an engine generator for heating hot and cold water. The hot water storage system includes a hot water storage tank that stores hot water, a hot water storage heat exchanger that heats the hot water by performing heat exchange of exhaust heat of a heat exhaust device such as an engine generator, and a hot water storage heat exchanger. By having a circulating pump for inhaling the hot water heated in and discharging it to the hot water storage tank so as to form a temperature stratification, a water flow control valve for controlling the flow rate of the hot water storage heat exchanger, and a bypass for the hot water storage tank The hot water discharged from the circulation pump can be bypassed to the bypass path of the hot water storage tank so that the amount of hot water flowing into the hot water storage tank can be extremely small, so that the temperature stratification can be easily formed in the hot water storage tank. In addition, since the return hot water in the bypass passage can be heated again by passing it through the heat exchanger for hot water storage, the exhaust heat of the exhaust heat device such as the gas engine generator can be used without waste and the heat exhaust device can be used. An advantageous effect that high efficiency can be achieved is obtained.

According to the cogeneration system of the second aspect, in the cogeneration system of the first aspect, the bypass path is such that the hot water discharged from the circulation pump is passed again through the hot water storage heat exchanger. Since the return hot water in the bypass passage is heated again by the hot water storage heat exchanger, the waste heat of the heat exhaust device such as the gas engine generator can be used without waste to improve the utilization rate of the heat exhaust device. An advantageous effect that it can be achieved is obtained.

According to the cogeneration system of the third aspect, in the cogeneration system of the second aspect, the bypass has a hot water storage valve that performs opening and closing operations, and when the hot water storage valve is in an open state. By bypassing most of the hot water discharged from the circulation pump to the hot water storage tank, the amount of hot water flowing into the hot water storage tank can be reduced by bypassing the hot water discharged from the circulation pump to the bypass path of the hot water storage tank ( For example, if the original discharge rate of the circulation pump is 13 liters / minute, the inflow rate of the hot water storage tank is 0.65 liters / minute to 1.3 liters / minute.
), So that the advantageous effect that the temperature stratification can be easily formed in the hot water storage tank is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a cogeneration system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a hot water supply heat source device of a hot water storage type as a modification of the conventional cogeneration system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water storage system 2 Engine exhaust heat system 3 Floor heating system 4 High temperature heating system 5 Bath heating system 6 Bath reheating system 7 Control device 8 Gas engine generator 9 Bathtub 9A Hot water supply system 31, 32, 35 Open / close valve 33, 34 Floor 36 High temperature heater 101 Hot water storage tank 102 Circulation pump 102a, 115, 116, 122 Check valve 103, 104, 105, 106 Hot water storage thermistor 107, 113 Water quantity control valve 108 Water supply valve 109 Circulating hot water thermistor 110, 111 Baffle plate 112 Mixing valve 114 Hot water filling valve 117 Hot water supply port 118 Water supply port 119 Pressure reducing valve 120 Water supply thermistor 121 Water quantity sensor 123 Drainage port 124, 204, 302, 501 Heat exchanger 124a, 204a, 302a, 501a Heat supply side 124b, 204b, 302b, 501b Heat Receiving side 125 Hot water storage valve 126 Bypass path 201 Exhaust heat pump 202, 306 Hot water tank 203 Thermal three-way valve 205 Exhaust heat thermistor 206 Excess power recovery heater 207, 307, 602 Outgoing port 208, 308, 603 Return port 209, 304 Bypass pipe 301 Heating Pump 303 Heating outward thermistor 305 Heating return thermistor 401 Auxiliary heat source 402 Heating thermistor 403 Heating valve 404 Heating makeup water valve 502 Bath valve 601 Bath circulation pump 604 Hot water supply pipe 605 Bath circulation thermistor

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[Procedure amendment]

[Submission date] June 14, 2002 (2002.6.1
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

At the time of hot water supply, the hot water in the hot water storage tank 101 is supplied with the water supply valve 108 opened, the hot water storage valve 125 closed, and heating supply.
Since the water valve 404 is in a closed state, the hot water supply port 117 passes through the auxiliary heat source 401, the mixing valve 112, and the water amount control valve 113.
Supplied from The auxiliary heat source 401 is a hot water storage thermistor 1
When the measured temperature such as 03 is low and the built-in water flow sensor detects the water flow, the water flow is heated. Therefore, when the temperature of the hot water stored in hot water storage tank 101 is low, the hot water heated by auxiliary heat source 401 is supplied from hot water supply port 117, and the supply of low-temperature hot water can be prevented.
The filling valve 114 is a valve for filling.

Claims (3)

[Claims] 1. A cogeneration system having a hot water storage system that uses exhaust heat of a heat exhaust device such as an engine generator for heating hot water, wherein the hot water storage system includes a hot water storage tank that stores hot water and the engine power generation system. A hot-water storage heat exchanger that heats hot water by performing heat exchange with the exhaust heat of a heat-dissipating device such as a heat exchanger; and the hot-water storage tank so that the hot water that is heated by the hot-water storage heat exchanger is sucked to form a temperature stratification. A cogeneration system comprising: a circulation pump that discharges water to a hot water storage tank; a water flow control valve that controls a flow rate of the hot water storage heat exchanger; and a bypass path of the hot water storage tank. 2. The cogeneration system according to claim 1, wherein the bypass passage is a circulation passage for passing hot water discharged from a circulation pump through the hot water storage heat exchanger again. 3. The hot water storage system according to claim 1, wherein the bypass passage has a hot water storage valve for opening and closing the hot water storage valve. When the hot water storage valve is open, most of the hot water discharged from the circulation pump is bypassed to the hot water storage tank. The cogeneration system according to claim.