JP2003047155A - Power feeding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power feeding method which enables feeding low-cost electric power to a group of houses to be supplied with a low facility cost, while coping with the maximum power load. SOLUTION: The power feeding method comprises a generator 1 and an electric storage part 65 which stores electric power from the generator 1 or electric power from a commercial power supply 62, in a region or in a collective housing; and feeds electricity to a plurality of houses H involved in the region or in the collective housing with the generator 1 and the electric storage part 65.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power feeding method for feeding power to a plurality of dwelling units included in an area or an apartment house.

[0002]

2. Description of the Related Art Conventionally, in such a power feeding method, a generator is used to feed power to a shared power consuming device (for example, outdoor lighting, corridor lighting, etc.) in an area or an apartment house, and a plurality of devices included in the area or apartment house are supplied. Commercial power was supplied from a commercial power source to the dwelling units (hereinafter, sometimes referred to as a supply target dwelling unit group).

[0003]

However, in the conventional power feeding method, since each of the dwelling units in the dwelling unit group to be fed is supplied with only commercial power, which has a higher power cost than the generator, the power cost is high. There was a problem. Therefore, in order to solve such a problem, in recent years, a high-output power generator having a power generation capacity capable of supporting the maximum power load (corresponding to the peak power demand in the supply target dwelling unit group) is provided, It is considered that the generator supplies power to each dwelling unit of the dwelling unit group to be supplied. However, in this case, since a high-output generator capable of handling the maximum electric power load is provided, there is a problem that the price of the generator becomes high and the equipment cost becomes high.

The present invention has been made in view of the above circumstances, and an object thereof is a power supply method capable of supplying a low cost electric power to a supply target dwelling unit group at a low equipment cost while being capable of supporting a maximum electric power load. To provide.

[0005]

Means for Solving the Problems [Invention of Claim 1]
The feature of the power supply method according to claim 1 is that a generator and a power storage unit that stores power from the generator or power from a commercial power source are provided in a region or an apartment house, and the generator and the power storage unit are provided. , To supply power to a plurality of dwelling units included in the area or the housing complex. According to the power feeding method of claim 1, the power storage unit stores power from the generator or commercial power,
Power is supplied to each dwelling unit by a generator and a power storage unit. In other words, by supplying power from the power generator and the power storage unit, it is possible to handle the maximum power load, but since the power is supplied from the power storage unit, the power generator has a low power generation capacity and a low price. Things can be installed and equipment costs can be reduced. In general, the power demand in the supply target dwelling unit group fluctuates during the day. Therefore, when the power is stored in the power storage unit, when there is a margin in the output of the generator with respect to the power load, the surplus When electric power is stored in the power storage unit, or when the output of the generator is small with respect to the power load, low-cost commercial power such as midnight power is stored in the power storage unit, so that power storage in the power storage unit is performed. The cost can be reduced. Therefore,
The generator can supply low-cost electric power as compared to commercial electric power, and can also supply low-cost electric power from the power storage unit to supply low-cost electric power to the housing units to be supplied. be able to. Therefore, it has become possible to provide a power supply method capable of supplying a low-cost power to the supply target dwelling unit group at a low equipment cost while being able to handle the maximum power load. In addition, when operating the generator in rated operation, the surplus power is stored in the power storage unit when the output of the generator is sufficient with respect to the power load, increasing the time for operating the generator in rated operation. It is possible to operate with high efficiency.

[Invention of Claim 2] A feature of the power supply method according to Claim 2 is that midnight power from a commercial power source is stored in the power storage unit. According to the power supply method of the second aspect, the midnight power from the commercial power source is stored in the power storage unit, and the power storage unit supplies power to each dwelling unit. That is, in carrying out the power feeding method according to claim 1, the power storage unit stores the late-night power, which has a lower power storage cost than the power storage by the generator, to further reduce the power storage cost to the power storage unit. It can be reduced. Therefore, by storing the midnight power in the power storage unit, it is possible to further reduce the power storage cost in the power storage unit, and thus it is possible to supply power to the supply target dwelling unit group at a much lower cost.

[Invention of Claim 3] The feature of the power supply method of Claim 3 is that the area or apartment house is provided with a power receiving and transforming facility for collectively receiving power from a commercial power source and receiving the power. Power is supplied from the substation equipment to the plurality of dwelling units, and late-night power is received by the substation equipment to be stored in the power storage unit. According to the power feeding method of claim 3, commercial power is collectively received by the power receiving and transforming facility, power is supplied to each dwelling unit by the power receiving and transforming facility, and late-night power is received by the power receiving and transforming facility. Then, the power is stored in the power storage unit, and power is supplied to each dwelling unit by the power storage unit. In other words, by collectively receiving the power from the commercial power supply in the power receiving and transforming facility and supplying the power to the target dwelling unit group, it is possible to receive the commercial power at a high voltage with a low power cost, Since the commercial power is supplied, a low-cost generator having a smaller power generation capacity can be installed as a generator, and the facility cost can be further reduced. Further, while covering a part of the power load with commercial power, the cost reduction by receiving the commercial power at high voltage makes it possible to avoid the cost increase by supplying the commercial power, and By receiving the late-night power from the power receiving and transforming facility and storing it in the power storage unit, it is possible to further reduce the cost of power storage in the power storage unit, which in turn extends the cost of electricity to the target dwelling unit group. Can be powered. Therefore, it is possible to further reduce the facility cost, and it is possible to supply electric power at a much lower cost to the supply target dwelling unit group.

[Invention of Claim 4] The feature of the power supply method according to Claim 4 is that a hot water supply unit for recovering exhaust heat from the generator to heat hot water is provided, and the hot water supply unit is provided with the hot water supply unit. It is to supply hot water to multiple dwelling units. According to the power feeding method of claim 4, the hot water supply unit recovers the exhaust heat from the generator to heat the hot water, and the hot water heated by the hot water supply unit is supplied to the supply target dwelling unit group. . That is, for example, when the generator is configured as a rotary type driven by a combustion type prime mover such as an engine or a gas turbine, hot water is heated by using exhaust heat generated by the combustion type prime mover. By supplying the dwelling units, it is possible to supply hot water at low cost to each dwelling unit. Alternatively, when the generator is composed of various types of fuel cells, low-cost hot water is supplied to each dwelling unit by supplying hot water to the dwelling units by using exhaust heat discharged from the fuel cells. You can do it. Therefore, low-cost hot water and hot-water can be supplied to the supply target dwelling unit group, and the energy cost of the electric power and the hot-water can be reduced as a whole.

[Invention of Claim 5] The feature of the power supply method according to Claim 5 is that the hot water supply section is provided with a hot water storage tank for storing hot water heated by exhaust heat from the generator. The hot water stored in the hot water storage tank is configured to be supplied to the plurality of dwelling units. According to the power supply method of the fifth aspect, the hot and cold water heated by the exhaust heat from the generator is stored in the hot water storage tank, and the hot and cold water stored in the hot water storage tank is supplied to the plurality of dwelling units. In other words, when the heat demand in the target dwelling unit group is low, the excess exhaust heat of the generator is stored as hot water and used at the peak of heat demand to generate electricity without the hot water storage tank. Compared to the case where hot water heated by the exhaust heat of the machine is directly supplied to the target dwelling unit group,
The exhaust heat of the generator can be efficiently recovered, and the overall thermal efficiency can be improved. Therefore, since the overall thermal efficiency can be improved, it becomes possible to supply hot and cold water at a much lower cost to the housing units to be supplied, and it is possible to reduce the overall energy cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The configuration of a cogeneration system for carrying out the power feeding method of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the cogeneration system includes a plurality of dwelling units H included in an apartment house.
A power supply unit SE that supplies power to the housing, a hot water supply unit SW that supplies hot water to a plurality of dwelling units H included in the housing complex, and a control unit 5 that controls various controls of the cogeneration system.

The power supply section SE includes a generator 1 and a commercial power source 62.
A power receiving and transforming facility 61 that collectively receives electric power from a power source, and a grid interconnection device 63 that grid-links the generator 1 with a commercial power source 62,
An AC / DC converter 64 for converting the AC power received by the power receiving and transforming equipment 61 and the AC power from the generator 1 into DC power;
A power storage unit 65 that stores the DC power converted by the AC-DC converter 64 and an orthogonal conversion device 66 that converts the DC power of the power storage unit 65 into AC power are provided. The power supply line 68 is wired so that the AC power output from the orthogonal transformation device 66 is supplied to each dwelling unit H included in the housing complex and the shared power consumption device 67 in the housing complex. Hereinafter, the power consumption devices in the plurality of dwelling units H included in the housing complex and the shared power consumption device 67 in the housing complex may be collectively referred to as a power load. In addition, the power receiving and transforming equipment 61
A collective electric power meter M6 for measuring the electric power received is provided, and a power supply line 68 to each dwelling unit H is provided with a dwelling unit power meter M7 for measuring the electric power received at each dwelling unit H.

The hot water supply unit SW includes a heat exchanger 2 for recovering exhaust heat supplied with exhaust heat from the generator 1, a hot water storage tank 3, a tank water supply means Wb for supplying water to the hot water storage tank 3, and exhaust heat. Exhaust heat recovery circulation means Ce for circulating hot water between the heat recovery heat exchanger 2 and the hot water storage tank 3, and hot water supply circulation means Cs for circulating hot water between the hot water storage tank 3 and a plurality of dwelling units H included in the housing complex. , A water heater K which is provided in each of the plurality of dwelling units H included in the housing complex, heats hot water supplied through the hot water supply circulation means Cs, and supplies the hot water to each hot water demand unit in the dwelling unit H.
It is configured with.

The generator 1 is provided with a gas engine (not shown) that uses city gas supplied through the generator gas supply path 6 as fuel, and is of a rotary type that is driven by the gas engine. M1 in the figure is a gas supply path 6 for the generator
It is a common-use gas flow meter provided in the, and measures the gas consumption in the generator 1. The engine cooling water for cooling the gas engine is circulated in the cooling water circulation path 7 between the gas engine and the exhaust heat recovery heat exchanger 2. Reference numeral 8 in the drawing denotes a cooling water circulation pump provided in the cooling water circulation passage 7.

As shown in FIG. 2, in the present invention,
The hot water storage tank 3 is a low temperature tank 3 to which water is supplied by the tank water supply means Wb.
L, and a high temperature tank 3H to which hot water is supplied in an overflow state from the low temperature tank 3L are configured as an open type, and the exhaust heat recovery circulation means Ce takes hot water from the low temperature tank 3L and again The hot water recovery circulation means 11 is configured to circulate hot water in the exhaust heat recovery circulation path 11 for returning to 3 L.
Is configured to circulate hot water in the hot water supply circulation path 14 that takes hot water from the high temperature tank 3H and returns it to the low temperature tank 3L.

Referring to FIG. 2, the hot water storage tank 3 will be described. Inside the box-shaped tank main body 3m having an upper opening and a lid that can open and close the opening, the upper edge is The partition wall 3w provided below the upper part of the tank main body 3m is divided into two parts, one of which is a low temperature tank 3L and the other is a high temperature tank 3H. Overflowed over the upper edge of 3w, high temperature tank 3H
It is configured to be supplied to. The high temperature tank 3H is provided with a water level sensor 9 for detecting the water level in the high temperature tank 3H.
Further, a low temperature tank temperature sensor 10L for detecting the temperature of the hot and cold water of the low temperature tank 3L (hereinafter sometimes referred to as low temperature tank temperature),
A high temperature tank temperature sensor 10H is provided to detect the temperature of hot and cold water in the high temperature tank 3H (hereinafter sometimes referred to as high temperature tank temperature).

The exhaust heat recovery circulation means Ce will be described with reference to FIGS. 1 and 2. Circulation means C for exhaust heat recovery
e is a circulation route 11 for exhaust heat recovery, in which hot and cold water taken out from the bottom of the low temperature tank 3L is routed through the heat exchanger 2 for exhaust heat recovery to return from the upper part of the low temperature tank 3L, and its exhaust heat High temperature tank hot and cold water piped so as to take out a set amount of hot and cold water from the bottom of the high temperature tank 3H and supply it to the exhaust heat recovery circulating path 11 in the recovery circulation path 11 A take-out path 12 and an exhaust heat recovery circulation pump 13 provided in the exhaust heat recovery circulation path 11 are provided. The ratio of the amount of hot and cold water taken out from the low temperature tank 3L to the amount of hot and cold water taken out from the high temperature tank 3H is set so that the hot and cold water of the low temperature tank 3L can be heated and the hot and cold water of the high temperature tank 3H can be kept warm. , Exhaust heat recovery circulation path 11
By adjusting the diameter of each of the pipe forming the hot water and the hot water discharge passage 12 of the high temperature tank, the hot water discharge amount from the low temperature tank 3L and the hot water discharge amount from the high temperature tank 3H are set to be a set ratio. .

That is, hot water is taken out from the bottom of each of the low temperature tank 3L and the high temperature tank 3H at a set ratio, heated by the heat exchanger 2 for recovering exhaust heat, and then returned to the low temperature tank 3L. Hot water is stored in a state where the temperature stratification is stably formed, and hot water of a high temperature layer in which the temperature of the upper layer of the low temperature tank 3L is stable is overflowed and supplied to the high temperature tank 3H. The hot and cold water is stored in a state where there is no or a small temperature deviation in the depth direction and the temperature is maintained within a predetermined temperature range. By the way, although the details will be described later,
The temperature of the hot water in the low temperature tank 3L is controlled to be, for example, 65 ° C or lower. In that case, the temperature of the hot water in the high temperature tank 3H is maintained in the range of 50 to 60 ° C, for example.

The tank water supply means Wb comprises a tank water supply channel 4 connected to a water supply as a water supply source and a low temperature tank 3L of the hot water storage tank 3.
The tank water supply passage 4 is provided with a tank water supply passage opening / closing valve V1 for intermittently supplying water to the low temperature tank 3L.

The hot water supply circulation means Cs will be described with reference to FIGS. 1 and 2. In the hot water supply circulation means Cs,
The hot water supply circulation path 14 which is arranged to flow hot water taken out from the bottom of the high temperature tank 3H so as to return to the upper part of the low temperature tank 3L via a plurality of dwelling units H, and the dwell unit passage point in the hot water supply circulation path 14 The hot water supply circulation pump 15 provided on the upstream side is provided, and the upstream side opening / closing valve V is provided upstream of the installation location of the hot water supply circulation pump 15 in the hot water supply circulation path 14.
2 is provided, and the downstream side opening / closing valve V3 is provided on the downstream side of the passage through the dwelling unit in the hot water supply circulation path 14.

Further, the hot water tank bypass 16 is provided in the hot water supply circulation path 14 between the upstream open / close valve V2 and the hot water supply circulation pump 15, both at the place where the dwell unit is passed and at the downstream side. The on-off valve V3 is connected to a location between the two locations so that hot water can be circulated in the hot water supply circulation path 14 while bypassing the hot water storage tank 3 through the hot water storage tank bypass circuit 16. There is. The hot water tank bypass circuit 16 includes a check valve 17 and a hot water tank bypass circuit opening / closing valve V4.
Is provided. Further, the circulation water supply passage 18 connected to the water supply serving as the water supply source is connected to a portion of the hot water supply circulation passage 14 between the installation location of the upstream side opening / closing valve V2 and the installation location of the hot water supply circulation pump 15. The tap water is configured to be supplied to the hot water supply circulation path 14, and the circulation water supply path 18 is provided with a circulation water supply path open / close valve V5. Therefore, the circulation water supply means Wc is composed of the circulation water supply passage 18 and the circulation water supply passage opening / closing valve V5. In addition, the above-mentioned tank water supply passage 4
Also, a common-use tap water flow meter M2 is provided for measuring the amount of water passing through, and the amount of water flowing through each of the circulation water supply paths 18.

That is, the hot water supply circulation pump 15 is operated to open the upstream side opening / closing valve V2 and the downstream side opening / closing valve V3,
In the state where the hot-water tank detour opening / closing valve V4 and the circulation water supply path opening / closing valve V5 are closed, hot water is taken out from the high-temperature tank 3H and flows through the hot-water circulation path 14 to cool the low-temperature tank 3L as shown in FIG. To return to the normal circulation state in which hot water is circulated through the hot water supply circulation path 14 through the hot water storage tank 3.
In addition, the circulation pump 15 for hot water supply is operated and the upstream side opening / closing valve V
2 and the downstream side opening / closing valve V3 are closed, and the hot water tank bypass circuit opening / closing valve V4 and the circulation water supply path opening / closing valve V5 are opened,
As shown in FIG. 4, hot water flows into the hot water supply circulation path 14 and the hot water tank bypass circuit 16, so that the hot water tank bypass circuit 1
6, hot water is circulated through the hot water supply circulation path 14 and tap water is supplied to the hot water supply circulation path 14 through the circulation water supply path 18. That is, the hot water supply circulation means Cs is configured to be switchable between the normal circulation state and the water supply circulation state.

As shown in FIG. 1, for each dwelling unit H, a dwelling unit hot water supply passage 19 for supplying hot water flowing through the hot water supply circulation route 14, a dwelling unit gas supply passage 20 for supplying city gas,
A dwelling unit water supply passage 21 for supplying tap water is provided, and a dwelling unit hot water supply channel 19 is provided with a hot and cold water flow meter M3 for measuring the flow rate of hot and cold water supplied by the hot water supply circulation means Cs. Is provided with a dwelling unit gas flow meter M4, and the dwelling unit water supply channel 21 is provided with a dwelling unit tap water flow meter M5. The hot water supply passage 19 for the dwelling unit is connected to the water heater K, the water supply passage 21 for the dwelling unit is connected to the water heater K and a water consuming part such as a water tap of a washroom or a kitchen, and the gas supply passage 20 for the dwelling unit is It is connected to a gas consuming unit such as a water heater K and a gas stove.

Next, the control operation of the controller 5 will be described. First, power supply control for supplying power to the dwelling unit H and the shared power consumption device 67 by the generator 1 and the commercial power supply 62 will be described.

The control unit 5 sets a predetermined time zone for one day (for example, 1
Operate the generator 1 for 10 hours from 4:00 to 24:00,
In other time zones, the generator 1 is automatically operated every day so as to stop the generator 1. And while the generator 1 is operating,
When the power load is fed from the generator 1 and the power storage unit 65 and the output of the power generator 1 is excessive with respect to the power load, the surplus power is stored in the power storage unit 65, and the control unit 5 In this manner, when the generator 1 and the power storage unit 65 have insufficient outputs with respect to the electric power load during operation of the generator 1, the interconnection device 63 is set so that the shortage is compensated by the commercial power supply 62. Control. Further, while the generator 1 is stopped, power is supplied from the power storage unit 65 to the power load, and the control unit 5 controls the power load of the power storage unit 65 to the power load while the generator 1 is stopped. When the output is insufficient, the interconnection device 63 is controlled so that the insufficient amount is supplemented by the commercial power source 62.

Further, the control unit 5 controls the power storage unit 65 during the time period when the power supplied from the commercial power source 62 becomes the midnight power.
The power storage capacity of the power storage unit 65 is monitored, and power storage in the power storage unit 65 is controlled so that the power storage capacity of the power storage unit 65 reaches the set upper limit value. By the way, the storage capacity of the power storage unit 65 is monitored by calculating the storage capacity of the power storage unit 65 by the storage capacity calculation unit built in the control unit 5 based on the voltage of the power storage unit 65 and the like. That is, the power storage unit 65 stores the surplus power for the power load in the generator 1 and the midnight power of the commercial power supply 62.

Next, hot water supply control for supplying hot water from the hot water storage tank 3 to a plurality of dwelling units H will be described with reference to FIGS. 2 to 6. The detection information of the water level sensor 9, the low temperature tank temperature sensor 10L, and the high temperature tank temperature sensor 10H is input to the control unit 5, and the cooling water circulation pump 8, the exhaust heat recovery circulation pump 13, and the hot water supply circulation pump 15 are respectively generated. Stop control, tank water supply channel opening / closing valve V1, upstream side opening / closing valve V2, downstream side opening / closing valve V
3, hot water tank detour opening / closing valve V4 and circulation water supply path opening / closing valve V
It is configured to perform opening / closing control for each of the five. Further, the control unit 5 presets and stores a set upper limit temperature and a set lower limit temperature. By the way, as the set upper limit temperature,
In the exhaust heat recovery heat exchanger 2, the low temperature tank 3L of the hot water storage tank 3 is provided so that the cooling water of the gas engine of the generator 1 can be cooled by the hot and cold water from the hot water storage tank 3 to prevent overheating of the gas engine.
The temperature is set as an upper limit value of the temperature of hot water stored in, for example, 65 ° C. Moreover, since it is difficult to maintain the water quality when the temperature of hot water becomes low,
In order to maintain the quality of the hot water supplied to each dwelling unit H, it is set as the lower limit value of the temperature of the hot water stored in the high temperature tank 3H of the hot water storage tank 3, and is set to, for example, 50 ° C.

Then, the controller 5 controls the low temperature bath temperature sensor 1
Low temperature and high temperature temperature sensor 1 detected at 0L
When the low temperature tank temperature is lower than the set upper limit value and the high temperature tank temperature is higher than the set lower limit value based on the high temperature tank temperature detected at 0H, the exhaust heat recovery circulation pump 13 is operated to discharge the exhaust heat. When the low temperature tank temperature is equal to or higher than the set upper limit value and the high temperature tank temperature is higher than the lower limit value setting, the normal operation control is performed in which the recovery circulation means Ce is operated to circulate the hot water and the hot water supply circulation means Cs is in the normal circulation state. Is a circulation pump for exhaust heat recovery 1
3 is stopped to stop the hot water circulation operation of the exhaust heat recovery circulation means Ce and to bring the hot water supply circulation means Cs into the normal circulation state, the exhaust heat recovery stop operation control is executed, and the low temperature tank temperature is higher than the set upper limit value. When the temperature is low and the temperature of the high temperature tank is equal to or lower than the set lower limit value, the water supply circulation operation control is performed in which the exhaust heat recovery circulation means Ce is operated for hot water circulation and the hot water supply circulation means Cs is in the water supply circulation state. During execution of the operation control of each of the normal operation control, the exhaust heat recovery stop operation control, and the water supply circulation operation control, the control unit 5 is based on the water level detected by the water level sensor 9 and the high temperature tank 3H.
Water supply channel opening / closing valve V1 for the tank so that the water level of
Control the opening and closing.

Further, the control unit 5 is in the time zone when the operation of the generator 1 is stopped, regardless of the detection information of the low temperature tank temperature sensor 10L and the high temperature tank temperature sensor 10H, the exhaust heat recovery circulation means Ce. The hot water supply circulation operation is stopped and the generator stop operation control is performed to bring the hot water supply circulation means Cs into the normal circulation state. During execution of the generator stop operation control, the control unit 5 controls opening / closing of the tank water supply channel opening / closing valve V1 based on the water level detected by the water level sensor 9 so that the water level of the high temperature tank 3H becomes the set water level. .

When the operation unit 22 instructs the control unit 5 to execute the inspection operation control, the low temperature tank temperature sensor 10L.
Also, regardless of the information detected by the high temperature tank temperature sensor 10H, the operation control for inspection is executed in which the hot water circulation operation of the exhaust heat recovery circulation means Ce is stopped and the hot water supply circulation means Cs is in the water supply circulation state.

The control operation of the control unit 5 in each operation control will be described below with reference to FIGS. 2 to 6.
2 to 6, the open / closed state of each of the upstream side open / close valve V2, the downstream side open / close valve V3, the hot water tank bypass detour open / close valve V4, and the circulation water supply path open / close valve V5 is changed to an open state. The valve closed state is shown in a filled state. As shown in FIG. 2, in the normal operation control, the cooling water circulation pump 8, the exhaust heat recovery circulation pump 13 and the hot water supply circulation pump 1
5 to operate the upstream side opening / closing valve V2 and the downstream side opening / closing valve V3.
Is closed, and the hot water tank bypass circuit opening / closing valve V4 and the circulation water supply path opening / closing valve V5 are closed. That is, the exhaust heat recovery circulation means Ce
Is operated to circulate hot water, and the circulation means Cs for hot water supply is the hot water storage tank 3
A normal circulation state in which hot water is circulated through the hot water supply circulation path 14 is switched to. Then, the engine cooling water circulates through the exhaust heat recovery heat exchanger 2, and the hot water in the hot water storage tank 3 is taken out from the low temperature tank 3L and the high temperature tank 3H at the set ratio in the exhaust heat recovery circulation path 11. Circulates through the heat exchanger 2 for recovering exhaust heat to return from the upper part of the low temperature tank 3L, and is taken out from the high temperature tank 3H in the hot water supply circulation path 14 and goes around a plurality of dwelling units H to cool the low temperature tank 3L. Circulate back to the top. That is, the hot water extracted from the low temperature tank 3L and the high temperature tank 3H at a set ratio is heated by the heat exchange action with the engine cooling water in the exhaust heat recovery heat exchanger 2, and the low temperature tank 3
By returning to L, the hot and cold water of the low temperature tank 3L is heated, and the hot and cold water of the high temperature layer in which the temperature of the upper layer of the low temperature tank 3L is stable is overflowed and supplied to the high temperature tank 3H.
Hot water is stored in the high temperature tank 3H in a stable temperature,
Hot and cold water having a stable temperature in the high temperature tank 3H circulates over a plurality of dwelling units H, and the hot and cold water circulated in such a way is at each dwelling unit H.
Will be consumed in.

As shown in FIG. 3, in the exhaust heat recovery stop operation control, the cooling water circulation pump 8 and the hot water supply circulation pump 15 are operated, the exhaust heat recovery circulation pump 13 is stopped, and the upstream side opening / closing valve V2 and Open the downstream opening / closing valve V3,
The hot water tank detour opening / closing valve V4 and the circulation water supply path opening / closing valve V5 are closed. That is, the hot water circulation operation of the exhaust heat recovery circulation means Ce is stopped, and the hot water supply circulation means Cs is switched to the normal circulation state in which the hot water is circulated in the hot water supply circulation path 14 through the hot water storage tank 3. Then, the engine cooling water circulates through the exhaust heat recovery heat exchanger 2, but the exhaust heat recovery circulation pump 13 is stopped, so the exhaust heat recovery circulation path 1
The circulation of the hot water in the hot water storage tank 3 through the heat exchanger 2 for recovering exhaust heat through 1 is stopped, and the hot water in the hot water storage tank 3 is taken out from the high temperature tank 3H in the hot water supply circulation path 14 to obtain a plurality of dwelling units H.
And is circulated so as to return to the upper part of the low temperature tank 3L. Therefore, hot and cold water having a stable temperature in the high temperature tank 3H circulates over a plurality of dwelling units H, and the hot and cold water circulated in such a manner is used for each dwelling unit H.
Will be consumed in. Further, since the hot water in the hot water storage tank 3 does not flow through the exhaust heat recovery heat exchanger 2, it is possible to prevent the problem that the engine cooling water is overheated and the gas engine of the generator 1 is overheated. By the way, in this case, the engine cooling water is cooled by a cooling device different from the exhaust heat recovery heat exchanger 2. High temperature tank 3H
When the water level of the high temperature tank 3H detected by the water level sensor 9 becomes lower than the set water level as the amount of hot water of the tank decreases, the tank water supply channel opening / closing valve V1 is opened and the tank water supply channel 4 is opened. Since the water is supplied to the low temperature tank 3L through the above, the temperature of the hot water in the low temperature tank 3L is lowered. Then, based on the low temperature tank temperature detected by the low temperature tank temperature sensor 10L becoming lower than the set upper limit value, the control unit 5 executes the normal operation control.

As shown in FIG. 4, in the water supply circulation operation control, the cooling water circulation pump 8 and the exhaust heat recovery circulation pump 1 are provided.
3 and the circulating pump 15 for hot water supply are operated, the upstream side opening / closing valve V2 and the downstream side opening / closing valve V3 are closed, and the hot water tank bypass circuit opening / closing valve V4 and the circulation water supply channel opening / closing valve V5 are opened. That is, the exhaust heat recovery circulation means Ce is operated to circulate hot water, and the hot water supply circulation means Cs circulates hot water in the hot water supply circulation path 14 through the hot water tank bypass 16 and the hot water supply circulation path 14
It is switched to the water supply circulation state in which tap water is supplied to.
Then, the engine cooling water circulates through the exhaust heat recovery heat exchanger 2, and the hot and cold water in the hot water storage tank 3 circulates only in the exhaust heat recovery circulation path 11 and the high temperature tank hot and cold water take-out path 12 to supply hot water. It does not circulate through the route 14, but tap water from the tap water circulates in the hot water supply circulation route 14 in a state of bypassing the hot water storage tank 3 and flowing through the hot water storage tank bypass circuit 16. That is, the hot and cold water extracted from the low temperature tank 3L and the high temperature tank 3H at a set ratio is heated by the heat exchange action with the engine cooling water in the heat exchanger 2 for recovering exhaust heat and returned to the low temperature tank 3L. The hot and cold water of the low temperature tank 3L is heated, and the hot and cold water of the high temperature tank 3H in which the temperature of the upper layer of the low temperature tank 3L is stable is overflowed and supplied to the high temperature tank 3H. . On the other hand, tap water circulates over a plurality of dwelling units H, and the tap water that circulates in this way is consumed at each dwelling unit H.

Therefore, the temperature of the hot water in the high temperature tank 3H is 50 °.
When the water quality is higher than C and the water quality can be maintained, each dwelling unit H is supplied with the hot water of the high temperature tank 3H that is higher than 50 ° C and can maintain the water quality, and the temperature of the hot water of the high temperature tank 3H becomes 50 ° C or less. When it becomes difficult to maintain the water quality, the water supply circulation state is switched to, and tap water that can maintain the water quality is supplied to each dwelling unit H. During the water supply circulation operation control, the temperature of the hot water in the high temperature tank 3H rises, and the high temperature tank temperature sensor 10
The control unit 5 executes the normal operation control based on the high temperature tank temperature detected at H becoming higher than the set lower limit value.

As shown in FIG. 5, in the generator stop operation control, the cooling water circulation pump 8 and the exhaust heat recovery circulation pump 13 are stopped, the hot water supply circulation pump 15 is operated, and the upstream side opening / closing valve V2 and Open the downstream opening / closing valve V3,
The hot water tank detour opening / closing valve V4 and the circulation water supply path opening / closing valve V5 are closed. That is, the hot water circulation operation of the exhaust heat recovery circulation means Ce is stopped, and the hot water supply circulation means Cs is switched to the normal circulation state in which the hot water is circulated in the hot water supply circulation path 14 through the hot water storage tank 3. Then, the circulation of the engine cooling water is stopped and the hot water storage tank 3 through the exhaust heat recovery circulation path 11
The circulation of hot water is stopped, and the hot water in the hot water storage tank 3 circulates in the hot water supply circulation path 14. Then, the hot and cold water of the high temperature tank 3H circulates over a plurality of dwelling units H, and the hot and cold water thus circulated is consumed at each dwelling unit H. Therefore, the generator 1
Even when the operation is stopped, hot water is continuously supplied to each dwelling unit H.

As shown in FIG. 6, in the operation control for inspection, the cooling water circulation pump 8 and the exhaust heat recovery circulation pump 1 are used.
3 is stopped, the hot water supply circulation pump 15 is operated, the upstream side opening / closing valve V2 and the downstream side opening / closing valve V3 are closed, and the hot water tank bypass circuit opening / closing valve V4 and the circulation water supply passage opening / closing valve V5 are opened. That is, the hot water circulation operation of the exhaust heat recovery circulation means Ce is stopped, and the hot water supply circulation means Cs circulates the hot water in the hot water supply circulation path 14 through the hot water tank bypass 16 and tap water in the hot water supply circulation path 14. Is switched to the water supply circulation state in which is supplied. Then, the circulation of the engine cooling water is stopped, the circulation of the hot water in the hot water storage tank 3 is also stopped, and the tap water from the tap water circulates in the hot water supply circulation path 14 while bypassing the hot water storage tank 3. That is, tap water circulates over a plurality of dwelling units H, and the tap water circulating in such a manner is consumed in each dwelling unit H. Therefore, hot water is continuously supplied to each dwelling unit H while the hot water storage tank 3 is inspected.

Next, the water heater K provided in each dwelling unit H will be described with reference to FIG. The water heater K is a mixing section Km for mixing hot water supplied from the hot water supply passage 19 for housing units with water supplied from the water supply passage 21 for housing units, and the mixing section Km.
It is configured to include a heating unit Kh to which hot water is supplied as a heating target, and a remote control operation unit 31 including a hot water supply temperature setting unit that sets a hot water supply target temperature.

The heating section Kh is connected to the water supply channel 32 from the mixing section Km.
Heat exchanger 34 for heating the hot and cold water supplied through the hot water and the heated hot and cold water to the hot water supply passage 33, and the hot water for the bathtub (not shown) flowing through the reheating circulation passage 35. The heat exchanger 36 for heating, the gas burner 37 for heating the heat exchanger 34 for hot water supply and the heat exchanger 36 for additional heating, the heating control unit 38 for controlling the operation of the heating unit Kh, and the like are configured. .

The gas burner 37 has a gas supply passage 2 for a dwelling unit.
0 is connected to the dwelling unit gas supply path 20, and a gas cutoff valve 39 for cutting off the gas supply and a gas proportional valve 40 for adjusting the gas supply amount are provided.

The water supply passage 32 is provided with a water supply temperature sensor 41 for detecting the temperature of the supplied hot water and a water supply amount sensor 42 for detecting the flow rate of the supplied hot water, and the water supply passage 32 and the hot water supply passage 33 are bypassed with water. It is connected at the path 43. In the hot water supply passage 33, in order from the upstream side, a mixing valve 45 for adjusting the mixing ratio of hot water from the hot water supply heat exchanger 34 and water from the water supply bypass passage 43, and a water proportional valve 50 for adjusting the amount of hot water.
A hot water supply temperature sensor 44 for detecting the temperature of the hot water mixed by the mixing valve 45 is provided, and a hot water supply plug 49 is connected to the tip of the hot water supply passage 33. A hot water filling path 46 branched from the hot water supply path 33 is connected to a forward path of the reheating circulation path 35, and a hot water filling opening / closing valve 47 is provided in the hot water filling path 46. A bath circulation pump 48 that circulates bath water is provided in the return passage of the reheating circulation passage 35.

The mixing section Km is provided with a mixing valve 51 for adjusting the mixing ratio of the hot water supplied from the hot water supply passage 19 for the dwelling unit (that is, the hot water supply circulation means Cs) and the water supplied from the dwell water supply passage 21. , Hot water supply passage opening / closing valve 52 for intermittently supplying hot water from the hot water supply passage 19 for dwelling unit to the mixing valve 51
And a circulating hot water temperature sensor 53 for detecting the temperature of hot water supplied from the hot water supply passage 19 for dwelling units to the mixing valve 51 (hereinafter, may be referred to as circulating hot water temperature), and the mixing valve 51 from the hot water supply passage 21 for dwelling units. The temperature of the hot water supplied from the mixing valve 51 (hereinafter sometimes referred to as the mixed hot water temperature), and the temperature of the hot water supplied from the mixing valve 51 A mixture temperature sensor 55 for detecting, a mixture controller 56 for controlling the operation of the mixer Km, and the like are provided.

Next, the heating controller 38 and the mixing controller 56.
The control operation will be described. The heating control unit 38 is configured to communicate various control information with the remote control operation unit 31 and the mixing control unit 56. When the operation switch of the remote control operation unit 31 is turned on, the heating control unit 38
The mixing control unit 56 can be controlled, and the hot and cold water supply passage open / close valve 52 is opened. And hot water tap 4
When 9 is opened and the hot water flow rate detected by the water supply amount sensor 42 reaches or exceeds the set amount, the heating control unit 38 transmits the hot water supply target temperature set by the remote control operation unit 31 to the mixing control unit 56. The mixing control unit 56 uses the circulating hot and cold water temperature sensor 5
The circulating hot water temperature detected in 3 is compared with the hot water supply target temperature sent from the heating control unit 38, and when the circulating hot water temperature is equal to or higher than the hot water supply target temperature, the circulating hot water temperature is the hot water supply target temperature. When it is lower, the fact is transmitted to the heating control unit 38.

In addition, the mixing control unit 56 has a preset mixing target temperature set and stored therein. By the way, two types of low mixing target temperature and high mixing target temperature are set as the mixing target temperature, and the low mixing target temperature is set by the remote controller operating unit 3.
The hot water supply target temperature set in 1 corresponds to a preset normal hot water supply target temperature range (for example, 35 to 48 ° C). For example, the hot water supply target temperature is set to 30 ° C, and the high mixing target temperature is The hot water supply target temperature set by the remote control operation unit 31 is a preset high-temperature hot water supply target temperature (for example, 60 °).
It corresponds to the case of C), and is set to 45 ° C., for example.

When the hot water supply target temperature is transmitted from the heating control unit 38 based on the fact that the hot water supply plug 49 is opened and the hot water flow rate detected by the water supply amount sensor 42 exceeds the set amount, the mixing control unit 56 The circulating hot water temperature detected by the circulating hot water temperature sensor 53 is compared with the hot water supply target temperature. When the circulating hot water temperature is equal to or higher than the hot water supply target temperature, the circulating hot water temperature sensor 5
3, the mixing valve 51 is adjusted so that the mixed hot water temperature detected by the mixed temperature sensor 55 becomes the hot water supply target temperature based on the detected temperatures of the water supply temperature sensor 54 and the mixed temperature sensor 55, respectively. Hot water from the supply path 19 and water from the dwelling unit water supply path 21 are mixed, and the fact that the circulating hot water temperature is equal to or higher than the hot water supply target temperature is transmitted to the heating control unit 38. When the heating control unit 38 sends from the mixing control unit 56 that the circulating hot water temperature is equal to or higher than the hot water supply target temperature,
The gas burner 37 is put into a combustion stopped state. Therefore, the hot and cold water supplied from the mixing section Km to the heating section Kh is not heated by the heating section Kh and comes out from the hot water tap 49, and hot water having a hot water target temperature or a substantially hot water target temperature is discharged from the hot water tap 49. Take a bath.

On the other hand, when the circulating hot water temperature is lower than the hot water supply target temperature, it is detected by the mixing temperature sensor 55 based on the detected temperatures of the circulating hot water temperature sensor 53, the water supply temperature sensor 54 and the mixing temperature sensor 55. When the mixed hot water temperature is the low mixed target temperature when the hot water supply target temperature is in the normal hot water supply target temperature range, or is the high mixed target temperature when the hot water supply target temperature is the high hot water supply target temperature,
The mixing valve 51 is adjusted to mix hot water from the hot water supply passage 19 for the dwelling unit with water from the water supply passage 21 for the dwelling unit, and
The fact that the circulating hot water temperature is lower than the hot water supply target temperature is transmitted to the heating control unit 38. When the mixing control unit 56 sends a notification that the circulating hot water temperature is lower than the hot water supply target temperature, the heating control unit 38 burns the gas burner 37 to set the hot water supply target temperature,
Based on the detected temperature of the water supply temperature sensor 41 and the detected water supply amount of the water supply amount sensor 42, the opening degree and mixing of the gas proportional valve 40 are adjusted so that the temperature of the hot water flowing out from the hot water supply heat exchanger 34 becomes the hot water supply target temperature. The feed-forward control for adjusting the opening of the valve 45 is executed, and the hot water supply temperature sensor 4
Feedback control for finely adjusting the opening of the gas proportional valve 40 is executed based on the deviation between the detected temperature of 4 and the target hot water temperature. Therefore, hot and cold water having the hot water supply target temperature is discharged from the hot water tap 49.

That is, the heating control unit 38 and the mixing control unit 5
If the water heater controller is configured with 6, the water heater K is
A mixing section Km that mixes hot water from the hot water supply circulation means Cs with water from a water supply source and that the mixing ratio is adjustable.
The hot water supplied from the mixing section Km is heated, and the heating amount of the hot water is adjustable, and the hot water supply circulation means C.
The circulating hot water temperature sensor 53 for detecting the temperature of the hot water supplied from s, the feed water temperature sensor 54 for detecting the temperature of the water from the water supply source, and the circulating hot water temperature sensor 53 and the feed water temperature sensor 54, respectively. Based on this, when the temperature of the hot and cold water from the hot water supply circulation means Cs is equal to or higher than the hot water supply target temperature, the mixing ratio in the mixing section Km is adjusted so that the temperature of the hot and cold water after mixing becomes the hot water supply target temperature, and the heating section Kh. It is provided with a water heater controller that stops the heating operation. Further, when the temperature of the hot water from the hot water circulating means Cs is lower than the hot water target temperature, the hot water controller controls the hot water temperature after mixing to reach the hot water target temperature by the heating operation of the heating unit Kh. The mixing ratio in the mixing section Km is adjusted so as to reach the preset target mixing temperature as the temperature of the hot water to be heated so that the adjustment can be performed stably, and the heating amount of the heating section Kh is adjusted so as to reach the hot water supply target temperature. Is configured to adjust.

Therefore, when the temperature of the hot water from the hot water supply circulation means Cs is equal to or higher than the hot water supply target temperature, in the mixing section Km, the hot water from the hot water supply circulation means Cs and the water supply source are adjusted so as to reach the hot water supply target temperature. Since water is mixed and the hot and cold water thus mixed is discharged without being heated in the heating section Kh, hot or cold water having a target hot water supply temperature or a substantially hot water supply target temperature is obtained. or,
When the temperature of the hot water from the hot water supply circulation means Cs is lower than the hot water supply target temperature, the hot water supply water from the hot water supply circulation means Cs is adjusted to a mixed target temperature that allows stable temperature adjustment to the hot water supply target temperature. When the difference between the hot water temperature from the hot water supply circulation means Cs and the hot water supply target temperature is small, the water is heated to the hot water supply target temperature in the heating section Kh after being mixed with the water from the water supply source. However, hot and cold water having a hot water supply target temperature or a substantially hot water supply target temperature can be obtained. That is, the gas burner 37
In order to ensure the combustion stability of the above, the combustion amount of the gas burner 37 is set so as not to be smaller than a predetermined minimum combustion amount. Therefore, when the hot water mixing control as described above, that is, the control of mixing the hot water from the hot water supply circulation means Cs and the water from the water supply source to the mixing target temperature is not performed, the hot water supply circulation means Cs When the difference between the hot water temperature and the hot water supply target temperature is small and the combustion amount obtained based on the difference is smaller than the minimum combustion amount, for example, the gas burner 37 is combusted at the minimum combustion amount. This causes a problem that it is difficult to adjust the temperature of hot water to be discharged to the hot water supply target temperature. Therefore, by performing the hot and cold water mixing control as described above, the problems as described above can be solved.

In short, the temperature of the hot water supplied by the hot water supply circulation means Cs varies depending on the amount of hot water used in the housing units to be supplied, but the temperature of the hot water supplied by the hot water supply circulation means Cs is the hot water supply target temperature. In each of the above cases and when the temperature is lower than the hot water supply target temperature, the hot water having the hot water supply target temperature or the substantially hot water supply target temperature can be obtained in each dwelling unit H.

In the cogeneration system configured as described above, the meter reading of the hot water flow meter M3 and the dwelling unit power meter M7 in each dwelling unit H is performed by a management association that manages a plurality of dwelling units H included in a regional or collective housing. Then, each dwelling unit H will be charged.

[Another Embodiment] Another embodiment will be described below. (A) In the above embodiment, the power receiving and transforming equipment 61 that collectively receives the power from the commercial power source 62 is provided in the area or the housing complex, and the power receiving and transforming equipment 61 supplies the shared power consumption device 67 and the power. The case of supplying power to the target dwelling unit group is illustrated. Instead of this, each dwelling unit H of the dwelling unit group to be supplied,
In addition, a power receiving and transforming facility that receives power from the commercial power source 62 may be provided in an area or an apartment house. In this case, in the power receiving and transforming facility provided for the area or the housing complex, the shared power consuming device 67 is supplied with power, and the midnight power is received and stored in the power storage unit 65. An interconnection device for system interconnection of the power source with the commercial power source 62 will be provided.

(B) In the above embodiment, the case where the power storage unit 65 stores the midnight power of the commercial power source 62 has been described as an example. However, the power storage unit 65 may be configured to store normal power other than the midnight power. . However, in order to reduce the power cost, it is preferable to store late-night power.

(C) In the above embodiment, the case where both the output power of the generator 1 and the commercial power is stored in the power storage unit 65 has been illustrated, but it is configured to store only one of them. May be.

(D) In the above embodiment, the generator 1 is operated intermittently in a predetermined time zone for one day, but the generator 1 is interrupted. You may make it drive continuously without doing it.
However, the intermittent operation improves the durability of the generator 1, increases the usage period of the generator 1, and reduces the number of times the generator 1 needs to be replaced. Then it is preferable.

(E) In the above embodiment, when the output of the generator 1 and the power storage unit 65 is insufficient with respect to the electric power load, the commercial power source 62 is made to make up for the shortage. Was illustrated. Alternatively, the maximum power load may be handled by the generator 1 and the power storage unit 65, and the power load may be supplied only by the power generator 1 and the power storage unit 65. .

(F) The specific constitution of the tank water supply means Wb is as follows.
The configurations are not limited to those illustrated in the above embodiment. For example, the tank water supply path 4 is connected to a portion of the exhaust heat recovery circulation path 11 upstream of the installation location of the exhaust heat recovery heat exchanger 2, and water is supplied to the low temperature tank 3L through the exhaust heat recovery circulation path 11. It may be configured to do so. In this case, the tank water supply path 4 may be directly connected to the exhaust heat recovery circulation path 11 so that the tank water supply path 4 is always in communication with the exhaust heat recovery circulation path 11, or Water supply channel 4
Connected to the exhaust heat recovery circulation path 11 via a three-way valve,
A three-way valve is used to connect the tank water supply passage 4 to the exhaust heat recovery circulation passage 11
Alternatively, the water supply to the low temperature tank 3L may be intermittently switched by switching between a state in which communication is performed and a state in which communication is disconnected.

(G) The relationship between the temperature of the hot water and the temperature of the low temperature tank 3L and the temperature of the high temperature tank 3H changes in accordance with the fluctuation of the hot water usage amount in the housing units to be supplied, the fluctuation of the exhaust heat amount supplied from the generator 1, and the like. In many cases, the temperature of the hot water of the low temperature tank 3L is lower than the temperature of the hot water of the high temperature tank 3H.
The temperature of the hot water of L may become higher than the hot water of the high temperature tank 3H.

(H) The specific configuration of the hot water supply section SW is not limited to the configuration exemplified in the above embodiment. For example, the hot water storage tank 3 is omitted, and a boiler that heats the hot water flowing out of the exhaust heat recovery heat exchanger 2 to a set temperature is provided, and hot water of the set temperature is supplied to each dwelling unit H from the boiler. It may be configured. Further, the hot water storage tank 3 is not limited to the open type having the low temperature tank 3L and the high temperature tank 3H as in the above embodiment, and may be, for example, one closed type or one open type. Can also be configured.

(I) In the above embodiment, the case where the power supply method of the present invention is implemented in the cogeneration system including the power supply section SE and the hot water supply section SW has been described as an example, but the power supply including only the power supply section SE. The power supply method of the present invention may be implemented in a device.

(E) In the above embodiment, the water heater K is illustrated as including both the mixing section Km and the heating section Kh, but the mixing section Km may be omitted.

(L) When the generator 1 is constituted by an engine-driven rotary type driven by an engine such as a gas engine as in the above embodiment, the exhaust heat recovery heat exchanger 2 is used.
As the exhaust heat of the generator 1 to be supplied to the engine, exhaust gas of the engine may be supplied in addition to the engine cooling water exemplified in the above embodiment, or both the engine cooling water and the exhaust gas may be supplied. Is also good. When the generator 1 is configured as an engine-driven rotary type, as the engine, various fuels such as LP gas, petroleum, and gasoline are used in addition to the fuel using city gas exemplified in the above embodiment. Things can be used. Also, the generator 1
In addition to the engine-driven rotary type as illustrated in the above embodiment, the gas turbine-driven rotary type may be configured to be driven by a gas turbine. When the generator 1 is configured as a gas turbine driven rotary type, the exhaust heat recovery heat exchanger 2 is configured to supply the exhaust gas of the gas turbine as exhaust heat of the generator 1. Also, the generator 1
Is not limited to the rotary type as described above,
For example, various fuel cells can be used. When the generator 1 is composed of a fuel cell, the exhaust heat recovery heat exchanger 2 is configured to supply cooling water for the fuel cell as exhaust heat of the generator 1.

(Wo) In the above embodiment, one generator 1 is provided for one hot water storage tank 3, but a plurality of generators 1 are provided for one hot water storage tank 3. It may be provided. In this case, for example, one heat exchanger 2 for exhaust heat recovery is provided for each of the plurality of generators 1, and the plurality of heat exchangers 2 for exhaust heat recovery are connected in parallel to the hot water storage tank 3. A configuration can be adopted.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of a cogeneration system that implements a power supply method of the present invention.

FIG. 2 is a block diagram showing a configuration of a hot water supply unit in a cogeneration system and a hot and cold water flow state under normal operation control.

FIG. 3 is a block diagram showing a hot and cold water flow state in the exhaust heat recovery stop operation control of the hot water supply unit in the cogeneration system.

FIG. 4 is a block diagram showing a hot water flow state in a hot water supply circulation operation control of a hot water supply unit in a cogeneration system.

FIG. 5 is a block diagram showing a hot water flow state in operation control when the generator of the hot water supply unit in the cogeneration system is stopped.

FIG. 6 is a block diagram showing a hot water flow state in operation control for inspection of a hot water supply unit in a cogeneration system.

FIG. 7 is a block diagram showing a configuration of a water heater of a cogeneration system.

[Explanation of symbols]

1 generator 3 hot water storage tank 61 Substation equipment 62 Commercial power supply 65 power storage unit H dwelling unit SW hot water supply unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuo Sakamoto             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Akemi Kubota             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. F-term (reference) 5G066 AA04 CA04 DA08 HB02 HB09                       JA07 JA13 JB03 KA01 KA06                       KA12

Claims (5)

[Claims] 1. A region or an apartment house is provided with a generator and a power storage unit for storing power from the generator or power from a commercial power source, and the generator and the power storage unit are provided in the region or apartment house. A power supply method that supplies power to multiple dwelling units included. 2. The power feeding method according to claim 1, wherein the power storage unit stores midnight power from a commercial power source. 3. A substation facility for collectively receiving electric power from a commercial power source is provided in the area or housing complex, and the substation facility supplies power to the plurality of dwelling units, and the substation facility is operated at midnight. The power feeding method according to claim 1, wherein the power storage unit receives power and stores the power in the power storage unit. 4. A hot water supply unit for recovering exhaust heat from the generator to heat hot water, and the hot water supply unit supplies hot water to the plurality of dwelling units. The power supply method described in. 5. The hot water supply unit includes a hot water storage tank for storing hot water heated by exhaust heat from the generator, and the hot water stored in the hot water storage tank is supplied to the plurality of dwelling units. The power feeding method according to claim 4, which is configured.