JP6923477B2 - Water supply equipment - Google Patents

Description

The present invention relates to a water supply facility that supplies hot water from a water storage tank in a power generation unit to a water heater via a water receiving tank.

In factories, facilities, apartment buildings, etc., a cogeneration system is used that uses fuel cells to generate electricity or a generator that uses an engine to generate electricity and uses the exhaust heat generated during power generation for other purposes. Sometimes. In particular, hot water is produced by recovering exhaust heat generated during power generation into water, and this hot water is used for water heaters and the like.

For example, the water supply facility of Patent Document 1 includes a water receiving tank for storing water supplied from a water supply, a water supply means for supplying water from the water receiving tank to each of a plurality of dwelling units, and a power generation means for generating electricity using a gas engine. And the exhaust heat recovery heating means for recovering the heat generated in the power generation means and heating the water in the water receiving tank. As a result, the heat generated in the power generation means can be used to heat the water in the water receiving tank, and the efficiency of energy utilization when using fuel is improved.

Japanese Unexamined Patent Publication No. 2004-316974

In the waste heat recovery heating means of the water supply equipment of Patent Document 1, the waste heat of the power generation means is recovered to the water of the water receiving tank by using a two-stage heat exchanger of the engine side heat exchanger and the water receiving tank side heat exchanger. do. Further, in the exhaust heat recovery and heating means, the cooling water circulation path for circulating the engine cooling water, the water receiving tank water circulation path for circulating the water in the receiving tank, and the cooling water circulation path and the water receiving tank water circulation path are arranged between the engine. An exhaust heat recovery water circulation path that circulates the exhaust heat recovery water for indirectly recovering the exhaust heat from the cooling water to the water in the receiving tank is used. Then, the engine cooling water heated by the gas engine of the power generation means does not directly exchange heat with the water in the water receiving tank, but indirectly exchanges heat.

Therefore, there is room for improvement in order to effectively recover the exhaust heat of the power generation means to the water in the receiving tank. Further, in the water receiving tank water circulation path, the water in the water receiving tank, which has a lower temperature than the engine cooling water, circulates. As a result, water at a temperature at which germs can easily grow may circulate in the water circulation channel of the water receiving tank. When germs propagate, water containing germs may be supplied from the water receiving tank to the water heater of each dwelling unit.

The present invention has been made in view of the above problems, and it is possible to improve the utilization efficiency of exhaust heat by a simple structure and to supply hot water in a state in which germs are difficult to grow to a plurality of water heaters. It was obtained in an attempt to provide water supply facilities.

One aspect of the present invention is a power generation device that generates power using fuel, a waste heat recovery device that recovers waste heat generated when operating the power generation device into water to produce hot water, and the waste heat recovery device. A power generation unit with a water storage tank that stores the produced hot water,
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device for controlling the opening / closing operation or opening / closing adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided .
The water receiving tank is in a water supply facility configured to receive the hot water in a state of not circulating to the water storage tank from the water storage tank via the water receiving pipe in a one-way manner.
Another aspect of the present invention is a power generation device that generates power using fuel, an exhaust heat recovery device that recovers exhaust heat generated when operating the power generation device into water to produce hot water, and the exhaust heat recovery device. A power generation unit with a water storage tank that stores the hot water produced by
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device that controls the opening / closing operation or the opening degree adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided.
The operating status of the power generation device shall be the elapsed operation time of the power generation device.
The control device is in a water supply facility configured to switch the hot water supply valve from a closed position to an open position when the operation elapsed time elapses from the operation set time.
Yet another aspect of the present invention is a power generation device that generates power using fuel, an exhaust heat recovery device that recovers exhaust heat generated when operating the power generation device into water to produce hot water, and the exhaust heat recovery. A power generation unit with a water storage tank that stores the hot water produced by the device,
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device that controls the opening / closing operation or the opening degree adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided.
The state of the hot water in the water storage tank is defined as the temperature of the hot water in the water storage tank.
The control device is in a water supply facility configured to adjust the opening degree of the hot water supply valve so that the temperature of the hot water in the water storage tank becomes a target temperature.

In the water supply facility of the above aspect, the exhaust heat of the power generation device is recovered to the water in the water storage tank by the waste heat recovery device in the power generation unit. Therefore, the water in the water storage tank exchanges heat with the high-temperature exhaust heat generated from the power generation device, and is difficult to be cooled to a temperature at which germs may grow.

Further, the transfer of hot water from the water storage tank to the water receiving tank is performed by opening the water receiving pipe by the hot water supply valve arranged in the water receiving pipe by the control device. The hot water produced in the water storage tank only flows from the water storage tank to the water receiving tank as a one-way street in the water receiving pipe, and does not circulate between the water storage tank and the water receiving tank. Therefore, it is possible to reduce the possibility of germs propagating in the water receiving pipe.

Further, the exhaust heat of the power generation device is recovered to the water in the water storage tank, and only the hot water from which the exhaust heat is recovered is transferred from the water storage tank to the water receiving tank. Then, by supplying hot water from the water receiving tank to the plurality of water heaters as supply hot water, it is possible to improve the utilization efficiency of the exhaust heat of the power generation device. In addition, hot water, which is considered to have hardly propagated germs, can be supplied as hot water from the water receiving tank to the plurality of water heaters.

Further, the control device controls the opening / closing operation of the hot water supply valve or the opening / closing adjustment based on the state of hot water in the water storage tank or the operating state of the power generation device. As a result, hot water can be transferred from the water storage tank to the water receiving tank with a simple structure.

Therefore, according to the water supply equipment of the above aspect, it is possible to improve the utilization efficiency of exhaust heat by a simple structure, and it is possible to supply hot water in a state in which germs are difficult to propagate to a plurality of water heaters.

In addition to the water heater, a toilet or the like may be connected to the water receiving tank by a water supply pipe. Further, various devices that can use the hot water supply may be connected to the water receiving tank by a water supply pipe.
Further, the hot water supply valve can be an on-off valve that performs an opening / closing operation, and can also be a control valve (adjusting valve) that adjusts the opening / closing operation.

Explanatory drawing which shows the water supply facility which concerns on Embodiment 1. FIG. The flowchart which shows the control method of the water supply facility which concerns on Embodiment 1. The flowchart which shows the control method of the water supply facility which concerns on Embodiment 2.

A preferred embodiment of the water supply facility described above will be described with reference to the drawings.
As shown in FIG. 1, the water supply equipment 1 of this embodiment includes a power generation unit 2, a water receiving tank 4, a plurality of water heaters 6, a hot water supply valve 42, and a control device 3. The power generation unit 2 includes a power generation device 21 that generates power using fuel F, an exhaust heat recovery device 22 that collects exhaust heat H generated when operating the power generation device 21 into water W to produce hot water W1, and exhaust heat. It has a water storage tank 23 for storing the hot water W1 produced by the heat recovery device 22.

The water receiving tank 4 is configured to receive the hot water W1 from the water storage tank 23 via the water receiving pipe 41 and to store the supplied hot water W3 in which the hot water W1 and the clean water W2 are mixed. Each of the plurality of water heaters 6 is connected to the water receiving tank 4 by a water supply pipe 43, and is configured to receive the supplied hot water W3 from the water receiving tank 4.

The hot water supply valve 42 is arranged in the water receiving pipe 41, and the opening state of the water receiving pipe 41 can be changed. The control device 3 is configured to control the opening / closing operation of the hot water supply valve 42 based on the state of the hot water W1 in the water storage tank 23.

The water supply facility 1 of this embodiment will be described in detail below.
(Water supply facility 1)
As shown in FIG. 1, the water supply facility 1 can supply hot water W3 to each dwelling unit 5 included in an apartment house and water heaters 6 installed at a plurality of locations in a factory / facility or the like. .. The water supply pipe 43 of this embodiment is provided from the water receiving tank 4 to each dwelling unit 5 of the apartment house, and the water heater 6 is provided in each dwelling unit 5.

The water supply pipe 43 from the water receiving tank 4 to each dwelling unit 5 is piped from the water receiving tank 4 to the hot water supply port 51 in each dwelling unit 5. In addition to the water heater 6 in each dwelling unit 5, a toilet or the like is connected to the hot water supply port 51. The hot water supply W3 supplied from the water receiving tank 4 to each dwelling unit 5 is used not only for the water heater 6 but also for a toilet or the like.

(Power generation device 21)
As shown in FIG. 1, the power generation device 21 of the present embodiment is a fuel that generates electricity by reacting hydrogen extracted from a fuel (fuel gas) F such as city gas with oxygen in air A via an electrolyte such as ceramics. It is composed of batteries. The DC power generated by the power generation device 21 is converted into AC power by the inverter 211 and used.

Instead of being composed of a fuel cell, the power generation device 21 may be composed of a gas engine that operates by burning fuel F such as city gas and a generator that generates power by receiving the rotational force of the gas engine. In this case, the exhaust heat recovery device 22 can recover the exhaust heat H of the exhaust gas exhausted from the gas engine to water.

(Exhaust heat recovery device 22)
As shown in FIG. 1, the exhaust heat recovery device 22 recovers the exhaust heat from the high-temperature gas exhausted from the power generation device 21 such as a fuel cell to the water W, and for example, the hot water W1 in the range of 60 to 75 ° C. Is configured to produce. The waste heat recovery device 22 may recover the waste heat from the power generation cell of the power generation device 21 to the water W. A circulation pipe 231 is provided between the water storage tank 23 and the waste heat recovery device 22. The water W or hot water W1 in the water storage tank 23 passes through the circulation pipe 231 and the exhaust heat recovery device 22, is heated by the exhaust heat recovery device 22, and circulates to the water storage tank 23.

The exhaust heat recovery device 22 can be configured by a heat exchanger or the like that exchanges heat between a high-temperature gas or a power generation cell and water W. By recovering the exhaust heat H of the power generation device 21 to the water W, it is possible to prevent the power generation device 21 from being overheated and enable continuous operation of the power generation device 21.

(Water storage tank 23)
As shown in FIG. 1, the water storage tank 23 is configured to receive hot water W1 from the exhaust heat recovery device 22 and water W2 from the water supply 235. The water storage tank 23 is configured to store (store) water W or hot water W1 up to a full capacity. The full amount of water in this embodiment is 100% of the volume of the water storage tank 23 (volume amount). Then, when the hot water W1 is supplied from the water storage tank 23 to the water receiving tank 4, the water supply 235 is opened by the check valve 236 arranged in the water supply 235, and the water supply W2 is opened from the water supply 235 into the water storage tank 23. Is supplied (replenished). As a result, the amount of water in the water storage tank 23 is set to always be full by replenishing the water supply W2 from the water supply 235.

The check valve 236 provided in the water supply 235 allows the flow of the clean water W2 from the water supply 235 to the water storage tank 23 and blocks the reverse flow. When the water receiving pipe 41 is opened by the hot water supply valve 42 and the amount of water in the water storage tank 23 is about to decrease, the check valve 236 opens the water supply 235 and the water supply W2 is transferred from the water supply 235 to the water storage tank 23. Be replenished.

The full amount of water can be set to a state in which the amount of water in the water storage tank 23 is a specified amount. In this case, in the water storage tank 23, a float that floats on the liquid level of the water W or hot water W1 in the water storage tank 23 and can detect the change in the liquid level can be arranged to manage the full amount of water. can.

A temperature sensor 233 for measuring the temperature of the hot water W1 in the water storage tank 23 is arranged in the water storage tank 23. The temperature of the hot water W1 in the water storage tank 23 is controlled so as to be in the range of 60 to 75 ° C. When the temperature of the hot water W1 in the water storage tank 23 becomes equal to or higher than the specified upper limit temperature, the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4, and the water supply W2 is replenished from the water supply 235 to the water storage tank 23.

(Power generation unit 2)
As shown in FIG. 1, the power generation unit (power generation system) 2 is installed in a shared management place or the like in an apartment house. The normal power generation unit 2 includes a radiator that cools the power generation device 21, the exhaust heat recovery device 22, and the like in order to continue power generation when the temperature of the hot water W1 in the water storage tank 23 exceeds the specified upper limit temperature. There is. On the other hand, in the power generation unit 2 of the present embodiment, when the temperature of the hot water W1 in the water storage tank 23 becomes equal to or higher than the specified upper limit temperature, a part of the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4, and the water supply 235. Water supply W2 is replenished to the water storage tank 23. As a result, in the power generation unit 2 of this embodiment, the radiator can be eliminated.

(Water receiving tank 4)
As shown in FIG. 1, the water receiving tank 4 receives hot water W1 having a temperature of 75 ° C. or higher that cannot be held by the water storage tank 23 of the power generation unit 2 from the water storage tank 23, and the hot water W1 is mixed with the clean water W2. It can be supplied to each dwelling unit 5 as the hot water supply W3. The water receiving tank 4 is configured to receive the base water W2 from the water supply 45. The water supply 45 is provided with a valve for opening and closing the water supply 45 to replenish the water supply W2 into the water receiving tank 4. This valve can be a solenoid valve that opens and closes in response to a command from the control device 3.

Further, the amount of water in the water receiving tank 4 is limited to a predetermined amount or less so that the hot water W1 transferred from the water storage tank 23 can be received. The water receiving tank 4 has a sufficient volume for storing the hot water W1 transferred from the water storage tank 23 and supplying it to each dwelling unit 5. The volume of the water receiving tank 4 can be, for example, 30 to 1000 times the volume of the water storage tank 23.

(Water receiving pipe 41)
As shown in FIG. 1, the water receiving pipe 41 is piped from the water storage tank 23 to the water receiving tank 4. The water receiving pipe 41 of this embodiment is not provided with a transfer pump for transferring the hot water W1 from the water storage tank 23 to the water receiving tank 4. The transfer of the hot water W1 from the water storage tank 23 of the present embodiment to the water receiving tank 4 is performed by the pressure difference between the two tanks 23 and 4. Specifically, the pressure in the water supply W2 of the water supply 235 acts on the hot water W1 in the water storage tank 23, so that the pressure in the water storage tank 23 becomes higher than the pressure in the water receiving tank 4. Then, when the hot water supply valve 42 opens the water receiving pipe 41, the hot water W1 is supplied from the water storage tank 23 to the water receiving tank 4 under the pressure of the water supply 235. The structure of the water supply facility 1 can be made simpler by the configuration in which the water receiving pipe 41 does not use a pump.

The water receiving pipe 41 may be provided with a transfer pump for transferring the hot water W1 from the water storage tank 23 to the water receiving tank 4. In this case, the hot water W1 can be easily transferred from the water storage tank 23 to the water receiving tank 4.

(Hot water supply valve 42)
As shown in FIG. 1, the hot water supply valve 42 of the present embodiment is an electromagnetic on-off valve, and can be switched between an open position for opening the water receiving pipe 41 and a closed position for closing the water receiving pipe 41. When the hot water supply valve 42 is in the closed position, the water W or the hot water W1 in the water storage tank 23 is circulated to the exhaust heat recovery device 22 by the circulation pipe 231 and maintained in the water storage tank 23. When the hot water supply valve 42 is in the open position, the hot water W1 in the water storage tank 23 is transferred to the water receiving tank 4.

(Water supply pipe 43)
As shown in FIG. 1, the water supply pipe 43 is piped from the water receiving tank 4 to each dwelling unit 5. The water supply pipe 43 has an upstream side pipe part 431 connected to the water receiving tank 4 and a plurality of branch pipe parts 432 provided by branching from the upstream side pipe part 431 to the hot water supply port 51 of each dwelling unit 5. A transfer pump 44 for pressurizing the supplied hot water W3 in the water receiving tank 4 and transferring it to the hot water supply port 51 of each dwelling unit 5 is arranged in the upstream piping portion 431 of the water supply pipe 43.

(Water heater 6)
As shown in FIG. 1, the water heater 6 heats the hot water supply W3 supplied from the water receiving tank 4 to produce hot water. The water heater 6 of this embodiment is a gas water heater that heats water or the like by burning fuel gas such as city gas with a burner. The water heater 6 may be used not only for bathrooms but also for kitchens, washrooms and the like. In addition to a plurality of types of water heaters 6, various types of water heaters 6 may be connected to the hot water supply port 51 of each dwelling unit 5.

The hot water from the water heater 6 is used in each dwelling unit 5. In the water heater 6, the amount of fuel gas used for heating in the water heater 6 can be reduced by using the hot water supply W3 warmed to a predetermined temperature. As a result, the utility cost in each dwelling unit 5 can be reduced.

(Control device 3)
The control device 3 of the present embodiment detects the state of the hot water W1 in the water storage tank 23 by the temperature of the hot water W1 in the water storage tank 23. The temperature of the hot water W1 is detected by the temperature sensor 233. The control device 3 is configured to switch the hot water supply valve 42 from the closed position to the open position when the temperature of the hot water W1 becomes equal to or higher than the specified upper limit temperature. The specified upper limit temperature of this embodiment is set to 65 ° C. The specified upper limit temperature can be set, for example, in the temperature range of 60 to 75 ° C.

Further, the control device 3 is configured to switch the hot water supply valve 42 from the open position to the closed position when the temperature of the hot water W1 in the water storage tank 23 becomes equal to or lower than the specified lower limit temperature. The specified lower limit temperature of this embodiment is set to 50 ° C. The specified lower limit temperature can be set, for example, lower than the specified upper limit temperature and within the temperature range of 45 to 60 ° C.

The control device 3 of the present embodiment uses the temperature sensor 233 provided in the water storage tank 23 to determine the timing of transferring the hot water W1 from the water storage tank 23 to the water receiving tank 4. Thereby, the temperature of the hot water W1 in the water storage tank 23 can be appropriately controlled. Therefore, the recovery of the exhaust heat H from the power generation device 21 and the supply of the hot water W1 to the water receiving tank 4 can be appropriately performed in a well-balanced manner.

The timing of switching the hot water supply valve 42 from the open position to the closed position by the control device 3 may be when a predetermined time elapses after the hot water supply valve 42 is switched from the closed position to the open position. In this case, the hot water supply valve 42 switches from the closed position to the open position only for a predetermined time, and the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4 only for this predetermined time.

The control device 3 of this embodiment is different from the control device that controls the operation of the power generation device 21. The control device 3 can also be constructed in a control device that controls the operation of the power generation device 21.

(Control method)
Next, a method of controlling the water supply equipment 1 by the control device 3 will be described with reference to the flowchart of FIG.
In the power generation unit 2, the operation of the power generation device 21 is controlled by another control device. Then, the power generation device 21 is operated, and the electric power generated by the power generation device 21 is converted into AC power by the inverter 211 and can be used in each dwelling unit 5. Further, the exhaust heat H of the high-temperature gas discharged from the power generation device 21 when the power generation device 21 generates power is recovered by the exhaust heat recovery device 22 into the water W circulated from the water storage tank 23. The waste heat recovery device 22 may recover the waste heat from the power generation cell of the power generation device 21 to the water W.

The hot water supply valve 42 is normally maintained in a closed position, and the water W or hot water W1 in the water storage tank 23 is in the water storage tank 23 except when it is circulated to the circulation pipe 231 and the exhaust heat recovery device 22. Be maintained. Then, as the operating time of the power generation device 21 becomes longer, the temperature of the hot water W1 in the water storage tank 23 rises.

When the power generation unit 2 is operated, the control device 3 monitors the temperature of the hot water W1 in the water storage tank 23 by the temperature sensor 233 and controls the opening / closing operation of the hot water supply valve 42. Then, the control device 3 determines whether or not the temperature measured by the temperature sensor 233 of the water storage tank 23 is equal to or higher than the specified upper limit temperature (step S1 in FIG. 2). When the temperature by the temperature sensor 233 is less than the specified upper limit temperature, the control device 3 keeps the hot water supply valve 42 in the closed position. Then, when the temperature of the hot water W1 in the water storage tank 23 rises and the temperature by the temperature sensor 233 becomes equal to or higher than the specified upper limit temperature, the control device 3 switches the hot water supply valve 42 from the closed position to the open position (step S2). ).

At this time, the water receiving pipe 41 is opened by the hot water supply valve 42, and the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4. Further, as the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4, the check valve 236 opens the water supply 235 due to the water pressure of the water supply W2, and the water supply W2 is replenished from the water supply 235 into the water storage tank 23. Will be done.

Next, the control device 3 determines whether or not the temperature measured by the temperature sensor 233 of the water storage tank 23 is equal to or lower than the specified lower limit temperature (step S3). When the temperature by the temperature sensor 233 exceeds the specified lower limit temperature, the control device 3 maintains the hot water supply valve 42 in the open position. Then, when the temperature of the hot water W1 in the water storage tank 23 is lowered by mixing the clean water W2 with the hot water W1 in the water storage tank 23 and the temperature by the temperature sensor 233 becomes equal to or lower than the specified lower limit temperature, the control device. In step 3, the hot water supply valve 42 is switched from the open position to the closed position (step S4).

Next, it is determined whether or not there is a signal for stopping the operation of the power generation unit 2 (a signal for stopping the operation control of another control device) (step S5). When the operation of the power generation unit 2 is stopped, the control of the opening / closing operation of the hot water supply valve 42 by the control device 3 is also stopped. On the other hand, when the operation of the power generation unit 2 is continued, the process returns to step S1 and steps S1 to S5 are repeatedly executed.

(Action effect)
In the water supply equipment 1 of the present embodiment, the exhaust heat H of the power generation device 21 is recovered to the water W of the water storage tank 23 by the exhaust heat recovery device 22 in the power generation unit 2. Therefore, the water W in the water storage tank 23 exchanges heat with the high-temperature exhaust heat H generated from the power generation device 21, and is not easily cooled to a temperature at which germs may grow.

Further, the transfer of the hot water W1 from the water storage tank 23 to the water receiving tank 4 is performed by opening the water receiving pipe 41 by the hot water supply valve 42 arranged in the water receiving pipe 41 by the control device 3. Then, the hot water W1 created in the water storage tank 23 only flows from the water storage tank 23 to the water receiving tank 4 as a one-way street in the water receiving pipe 41, and circulates between the water storage tank 23 and the water receiving tank 4. There is no. Therefore, it is possible to reduce the possibility of germs propagating in the water receiving pipe 41.

Further, the exhaust heat H of the power generation device 21 is recovered to the water W of the water storage tank 23, and only the hot water W1 from which the exhaust heat H is recovered is transferred from the water storage tank 23 to the water receiving tank 4. Then, the hot water W1 is supplied as the supply hot water W3 from the water receiving tank 4 to the plurality of water heaters 6. As a result, the exhaust heat H of the power generation device 21 is recovered by performing one-step heat exchange as the exhaust heat recovery device 22. Thereby, the utilization efficiency of the exhaust heat of the power generation device 21 can be improved. Further, the hot water W1 which is considered to have hardly propagated various germs can be supplied as the hot water supply W3 from the water receiving tank 4 to the plurality of water heaters 6.

Further, the control device 3 controls the opening / closing operation of the hot water supply valve 42 based on the temperature of the hot water in the water storage tank 23. As a result, the hot water W1 can be transferred from the water storage tank 23 to the water receiving tank 4 with a simple structure.

Therefore, according to the water supply facility 1 of the present embodiment, the utilization efficiency of the exhaust heat H can be improved by a simple structure, and the hot water W1 in a state in which germs are difficult to propagate can be supplied to the plurality of water heaters 6. can.

If the water receiving tank 4 is devised to prevent germs from propagating, instead of supplying the clean water W2 from the water supply 235 to the water storage tank 23, the water receiving tank 4 goes to the water storage tank 23. The supply hot water W3 may be supplied by the transfer pump 44.

<Embodiment 2>
This embodiment shows a case where the method of controlling the opening / closing operation of the hot water supply valve 42 by the power generation device 21 is different from the case of the first embodiment.
The control device 3 of this embodiment is configured to control the opening / closing operation of the hot water supply valve 42 based on the elapsed operation time as the operation status of the power generation device 21. More specifically, the control device 3 is configured to switch the hot water supply valve 42 from the closed position to the open position when the elapsed operation time elapses from the set operation time. Further, the control device 3 is configured to switch the hot water supply valve 42 from the open position to the closed position when a predetermined time elapses after the hot water supply valve 42 is switched from the closed position to the open position.

(Control method)
The control method of this embodiment will be described with reference to the flowchart of FIG.
When the power generation unit 2 of the present embodiment is operated, the control device 3 monitors the elapsed operation time from the start of the operation of the power generation device 21 and controls the opening / closing operation of the hot water supply valve 42. When the operation of the power generation device 21 is started, the control device 3 starts the measurement of the elapsed operation time. Then, the control device 3 determines whether or not the operation elapsed time has elapsed the operation set time (step S11 in FIG. 3). When the elapsed operation time is not the set operation time, the control device 3 keeps the hot water supply valve 42 in the closed position. Then, when the elapsed operation time elapses from the set operation time, the control device 3 switches the hot water supply valve 42 from the closed position to the open position (step S12).

At this time, the water receiving pipe 41 is opened by the hot water supply valve 42, and the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4. Further, as the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4, the check valve 236 opens the water supply 235 due to the water pressure of the water supply W2, and the water supply W2 is replenished from the water supply 235 into the water storage tank 23. Will be done.

Further, when the control device 3 switches the hot water supply valve 42 from the closed position to the open position, the control device 3 measures the elapsed time from the switching, and opens the hot water supply valve 42 until the elapsed time reaches a predetermined time. (Step S13). Then, when the elapsed time reaches a predetermined time, the control device 3 switches the hot water supply valve 42 from the open position to the closed position (step S14). Further, the control device 3 resets the elapsed operation time to zero and starts measuring the elapsed operation time again (step S15).

Next, it is determined whether or not there is a signal for stopping the operation of the power generation unit 2 (a signal for stopping the operation control of another control device) (step S16). When the operation of the power generation unit 2 is stopped, the control of the opening / closing operation of the hot water supply valve 42 by the control device 3 is also stopped. On the other hand, when the operation of the power generation unit 2 is continued, the process returns to step S11, and steps S11 to S15 are repeatedly executed.

In this embodiment, a part of the hot water W1 is transferred from the water storage tank 23 to the water receiving tank 4 every time the operation elapsed time elapses. As a result, the temperature of the hot water W1 in the water storage tank 23 can be prevented from rising excessively. Further, the temperature sensor 233 may not be arranged in the water storage tank 23.

The operation set time and the predetermined time can be appropriately changed according to the season, time, time zone, etc. in which the power generation unit 2 is operated. For example, the operation set time in the summer when the outside air temperature is high can be set shorter than the operation set time in the winter when the outside air temperature is low, considering that the temperature of the hot water W1 tends to rise.

When the temperature sensor 233 is arranged in the water storage tank 23, the timing of switching the hot water supply valve 42 by the control device 3 from the open position to the closed position is such that the temperature of the hot water W1 in the water storage tank 23 is equal to or lower than the specified lower limit temperature. It can also be when it becomes. In this case, the temperature of the hot water W1 in the water storage tank 23 can be prevented from dropping too much.

The other configurations, working effects, and the like of the water supply facility 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

<Embodiment 3>
The power generation device 21 of this embodiment is configured to control the opening degree adjustment of the hot water supply valve 42. Specifically, the control device 3 of the present embodiment monitors the temperature of the hot water W1 as the state of the hot water W1 in the water storage tank 23, and opens the hot water supply valve 42 so that the temperature of the hot water W1 becomes the target temperature. Is configured to adjust.

The hot water supply valve 42 of this embodiment is configured as a control valve capable of changing the opening degree for adjusting the opening degree of the water receiving pipe 41. The hot water W1 may be constantly transferred from the water storage tank 23 to the water receiving tank 4 by adjusting the opening degree of the hot water supply valve 42 by the control device 3. When the opening degree of the hot water supply valve 42 is large, the flow rate of the hot water W1 transferred from the water storage tank 23 to the water receiving tank 4 is large, and when the opening degree of the control valve is small, the water storage tank 23 to the water receiving tank 4 The flow rate of the hot water W1 transferred to is reduced.

When operating the power generation unit 2 of this embodiment, the control device 3 monitors the temperature of the hot water W1 in the water storage tank 23. Then, the control device 3 obtains a deviation between the target temperature and the temperature of the hot water W1 in the water storage tank 23, and adjusts the opening degree of the hot water supply valve 42 so that this deviation disappears. The control of the opening degree adjustment of the hot water supply valve 42 by the control device 3 can be feedback control such as so-called PID control.

In this embodiment, the opening degree of the hot water supply valve 42 is adjusted so that the temperature of the hot water W1 in the water storage tank 23 becomes the target temperature. As a result, the opening degree of the hot water supply valve 42 is adjusted so that the amount of heat of exhaust heat recovery to the water W by the exhaust heat recovery device 22 and the amount of heat of the hot water W1 transferred from the water storage tank 23 to the water receiving tank 4 are balanced. It will be adjusted. Then, it is considered that a state in which a small amount of hot water W1 is constantly transferred from the water storage tank 23 to the water receiving tank 4 is formed. Therefore, the temperature of the hot water W1 in the water storage tank 23 can be easily maintained at an appropriate temperature.

The other configurations, working effects, and the like of the water supply facility 1 of the present embodiment are the same as those of the first embodiment. Further, also in this embodiment, the components indicated by the same reference numerals as those shown in the first embodiment are the same as those in the first embodiment.

The present invention is not limited to each embodiment, and further different embodiments can be configured without departing from the gist thereof. The present invention also includes various modifications, modifications within an equal range, and the like.

1 Water supply equipment 2 Power generation unit 21 Power generation device 22 Exhaust heat recovery device 23 Water storage tank 233 Temperature sensor 3 Control device 4 Water receiving tank 41 Water receiving piping 42 Hot water supply valve 43 Water supply piping 5 Dwelling unit 6 Water heater

Claims (8)

A power generation device that generates electricity using fuel, an exhaust heat recovery device that recovers exhaust heat generated when operating the power generation device into water to produce hot water, and hot water produced by the exhaust heat recovery device are stored. A power generation unit with a water storage tank and
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device for controlling the opening / closing operation or opening / closing adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided .
The water receiving tank is a water supply facility configured to receive the hot water in a state of not circulating to the water storage tank from the water storage tank via the water receiving pipe in a one-way manner. The water supply facility according to claim 1, wherein clean water is supplied to the water storage tank during or after the hot water is being supplied from the water storage tank to the water receiving tank. The state of the hot water in the water storage tank is defined as the temperature of the hot water in the water storage tank.
The water supply facility according to claim 1 or 2, wherein the control device is configured to switch the hot water supply valve from a closed position to an open position when the temperature of the hot water becomes equal to or higher than a specified upper limit temperature. The control device uses the hot water supply valve when the temperature of the hot water in the water storage tank becomes equal to or lower than the specified lower limit temperature, or when a predetermined time elapses after the hot water supply valve is switched from the closed position to the open position. The water supply facility according to claim 3, wherein the water supply facility is configured to switch from an open position to a closed position. A power generation device that generates electricity using fuel, an exhaust heat recovery device that recovers exhaust heat generated when operating the power generation device into water to produce hot water, and hot water produced by the exhaust heat recovery device are stored. A power generation unit with a water storage tank and
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device for controlling the opening / closing operation or opening / closing adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided.
The operating status of the power generation device shall be the elapsed operation time of the power generation device.
The control device is a water supply facility configured to switch the hot water supply valve from a closed position to an open position when the operation elapsed time elapses from the operation set time. The control device provides the hot water supply valve when a predetermined time elapses after the hot water supply valve is switched from the closed position to the open position, or when the temperature of the hot water in the water storage tank becomes equal to or lower than a specified lower limit temperature. The water supply facility according to claim 5, which is configured to switch from an open position to a closed position. A power generation device that generates electricity using fuel, an exhaust heat recovery device that recovers exhaust heat generated when operating the power generation device into water to produce hot water, and hot water produced by the exhaust heat recovery device are stored. A power generation unit with a water storage tank and
A water receiving tank that receives the hot water from the water storage tank via a water receiving pipe and stores supply hot water in which the hot water and clean water are mixed.
A plurality of water heaters connected to the water receiving tank by a water supply pipe and receiving the supplied hot water from the water receiving tank, and a plurality of water heaters.
A hot water supply valve that is arranged in the water receiving pipe and can change the opening state of the water receiving pipe.
A control device for controlling the opening / closing operation or opening / closing adjustment of the hot water supply valve based on the state of the hot water in the water storage tank or the operating state of the power generation device is provided.
The state of the hot water in the water storage tank is defined as the temperature of the hot water in the water storage tank.
Wherein the control device, so that the temperature of the hot water in the water storage tank becomes equal to the target temperature, is configured to adjust an opening degree of the hot water supply valve, water supply systems. The water supply pipe is provided from the water receiving tank to each dwelling unit included in the apartment house.
The water heater according to any one of claims 1 to 7, wherein the water heater is provided in each of the dwelling units.

Images