JP2001065984A - Hot water storage type water heating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently heat exchange by executing an effective heat amount storage control for hot water in a plurality of hot water storage tanks. SOLUTION: The hot water storage type water heating facility comprises a circulating means A for selectively circulating hot waters in a plurality of hot water storage tanks 12A, 12B to a heating means 10, a hot water supply means B for selectively supplying to a hot water supply passage 17, storage heat amount detecting means 29, 30 for detecting storage heat amounts of the hot waters in the tanks 12A, 12B, and a hot water supply control means for executing a hot water supply operation. The control means executes a hot water supply control for supplying hot water of the tanks 12A, 12B and a heat amount storage control for sequentially heating the hot water, selects the tank having least storage heat amount of the plurality of the tanks 12A, 12B as a hot water storage tank to be heated in the heat amount storage control, and conducts heat amount recovery preferential heat control for heating the hot water of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plurality of hot water storage tanks and hot water in the plurality of hot water storage tanks is selected by the hot water heating means so that hot water in the plurality of hot water storage tanks is heated by hot water heating means. Circulating means for selectively circulating water, hot water supply means for selectively supplying hot water in the plurality of hot water storage tanks to the hot water supply path, and detecting the amount of heat stored in the hot water for each of the plurality of hot water storage tanks. Storage heat amount detection means to perform, and hot water supply control means for performing a hot water supply operation are provided,
The hot water supply control means selects one of the plurality of hot water storage tanks as a hot water storage tank of a hot water supply source according to a hot water supply start command, and supplies the hot water to the hot water storage tank so as to supply hot water. A plurality of hot water storage tanks in a heating mode for operating hot water supply control and heating the hot water until the stored heat quantity of the hot water storage tanks not selected as the hot water supply source among the plurality of hot water storage tanks reaches a set maximum storage heat quantity. The present invention relates to a hot water storage facility of a hot water storage type configured to execute heat storage control for operating the circulation means based on detection information of the stored heat detection means so as to sequentially heat hot water in the hot water.

[0002]

2. Description of the Related Art A hot-water storage system of the hot water storage type having such a configuration is
For example, it is known from Japanese Patent Application Laid-Open No. 6-221673. According to the hot water supply apparatus described in this publication, in a plurality of hot water storage tanks, the order in which the heat amount storage control is executed is predetermined, and when the heat amount storage control is executed, always, in accordance with the determined order, The hot water in each hot water storage tank is sequentially heated.

[0003]

Therefore, in the hot water supply system described in the above publication, when performing the heat storage control, the heat storage control is always performed in a predetermined order regardless of the amount of heat stored in each hot water storage tank. Has the following inconveniences.

[0004] That is, when the entire hot water in the hot water storage tank is heated to a desired temperature by the hot water heating means, the hot water is slowly circulated and heated to form a temperature stratification in the hot water in the hot water storage tank. There are a method of heating to a desired temperature by circulation once and a method of heating to a desired temperature while circulating hot and cold water in a hot water storage tank many times and many times.

If the hot / cold water heating means is, for example, a gas burner with a high calorific load, the former method can also be used.
The hot water in the hot water storage tank can be efficiently heated to a desired temperature, but if the hot water heating means is, for example, a heat exchanger using hot water of about 80 ° C., Even if it is circulated slowly, it is difficult to heat the entire circulating hot water, that is, from the surface to the center of the circulating hot water, to a desired temperature. Heating while circulating the hot water over and over again can efficiently heat the hot water in the hot water storage tank to a desired temperature. However, on the other hand, according to the latter method, the hot water in the hot water storage tank is circulated over and over again, so that the hot water and water in the hot water storage tank are mixed and the temperature stratification is not formed,
Therefore, a situation occurs in which the temperature of the hot and cold water in the hot water storage tank is made uniform. In addition, when the hot water in the hot water storage tank is heated by the hot water heating means, the lower the temperature of the hot water in the hot water storage tank to be heated, the more efficiently the heat exchange with the hot water in the hot water storage tank.

Therefore, when the hot / cold water heating means is the above-described heat exchanger, the more efficient the heat exchange becomes, the smaller the amount of stored heat and the lower the temperature of the hot / cold water after being homogenized by mixing. In addition, the stored heat amount is large, the higher the temperature of the hot and cold water after homogenization, the lower the heat exchange efficiency, but in the hot water supply equipment described in the above publication, regardless of the amount of stored heat in each hot water storage tank However, since the calorie storage control is always performed according to the determined order, there is a disadvantage that the efficiency of heat exchange by the hot and cold water heating means is reduced in some cases.

The present invention focuses on such conventional drawbacks, and an object of the present invention is to execute an effective heat exchange control for the hot and cold water in a plurality of hot water storage tanks. The purpose of the present invention is to provide a hot-water supply type hot-water supply system that enables the hot-water supply.

[0008]

To achieve this object, according to the first aspect of the present invention, a plurality of hot water storage tanks and hot water in the plurality of hot water storage tanks are heated by hot water heating means. Circulation means for selectively circulating hot water in the plurality of hot water storage tanks to the hot water heating means, hot water supply means for selectively supplying hot water in the plurality of hot water storage tanks to a hot water supply path, and the plurality of hot water storage means For each of the tanks, there is provided a stored heat amount detecting means for separately detecting a stored heat amount stored in hot water, and a hot water supply control means for executing a hot water supply operation,
The hot water supply control means selects one of the plurality of hot water storage tanks as a hot water storage tank of a hot water supply source according to a hot water supply start command, and supplies the hot water to the hot water storage tank so as to supply hot water. A plurality of hot water storage tanks in a heating mode for operating hot water supply control and heating the hot water until the stored heat quantity of the hot water storage tanks not selected as the hot water supply source among the plurality of hot water storage tanks reaches a set maximum storage heat quantity. A hot-water supply facility of a hot-water storage type configured to execute a heat quantity storage control for operating the circulation means based on detection information of the stored heat quantity detection means so as to sequentially heat hot water in the hot water supply apparatus, The means selects the hot water storage tank having the smallest stored heat amount among the plurality of hot water storage tanks as the hot water storage tank to be heated in the heat energy storage control, and selects the hot water storage tank. It is configured to perform the heat recovery priority heating control for heating the hot water of about.

In other words, the hot water storage tank having the least amount of stored heat among the plurality of hot water storage tanks is selected as the hot water storage tank to be heated, and the heat recovery priority heating control for heating the hot water in the hot water storage tank is performed. Therefore, among the plurality of hot water storage tanks, the hot water storage tank having the best heat recovery rate is selected and heated, and therefore, even if the hot water heating means is a heat exchanger using hot water, In addition, hot water can be heated while efficiently recovering heat.

[0010] According to the invention described in claim 2, the hot water supply control means selects a hot water storage tank having the largest amount of stored heat as the hot water supply source in accordance with the hot water supply start command in the hot water supply control, and Once a hot water storage tank is selected, the heat storage capacity of the selected hot water storage tank reaches the set lower limit heat quantity, or until the elapsed time from selecting the hot water storage tank as the hot water supply source reaches the set time. In addition to the hot water supply according to the present hot water supply start command, also in hot water supply according to the subsequent hot water supply start command, hot water is supplied from the selected hot water storage tank, and then hot water depletion control for selecting another hot water storage tank as a hot water supply source. And in the heat storage control, the hot water storage tank is selected as a hot water supply source in the execution of the hot water supply control. It is configured to select the no hot water tank as a hot water storage tank to be heated.

That is, in hot water supply control in which the hot water storage tank having the largest amount of stored heat is selected as the hot water storage tank of the hot water supply source to supply hot water, once one hot water storage tank is once selected as the hot water supply source according to the hot water supply start command, Until the stored heat amount of the selected hot water storage tank reaches the set lower limit heat amount, or until the elapsed time after selecting the hot water storage tank as the hot water supply source reaches the set time, not only hot water supply by the present hot water supply start command, In the subsequent hot water supply according to the hot water supply start command, the hot water supply of the selected hot water storage tank is supplied, and then the hot water exhaustion control of selecting another hot water storage tank as the hot water supply source is performed. In the hot water storage tank selected as the source, the hot water in the hot water storage tank is circulated and heated while leaving hot water at a temperature at which hot water can be supplied, As a result, a situation in which the entire hot and cold water including the hot water can be mixed is avoided as much as possible. Even if the hot water heating means is a heat exchanger using high-temperature hot water, Hot water heated to a possible temperature can be efficiently supplied with as little waste as possible. In addition, for the hot water storage tank that is not selected as the hot water supply source, in the heat storage control that sequentially heats the hot water in the hot water storage tank until the stored heat reaches the set maximum stored heat, in the hot water storage tank, in the execution of the hot water supply control, It is configured to select a hot water storage tank that is not selected as a hot water supply source as a hot water storage tank to be heated and perform hot water storage tank selection heating control for heating hot water for the hot water storage tank. The hot and cold water in the hot water storage tank that is not selected will be heated without waste as needed, and immediately after the hot water full use control is performed on the hot water storage tank selected as the hot water supply source, another hot water is immediately used. By selecting the hot water storage tank as a hot water supply source, continuous hot water supply can be performed.

According to the third aspect of the present invention, the hot water supply control means includes: a heat recovery priority heating mode for executing the heat recovery priority heating control in the heat storage control; The hot water storage tank having the largest amount of stored heat is selected as a hot water storage tank to be heated, and the hot water supply priority heating mode for executing hot water supply priority heating control for heating hot water for the hot water storage tank is freely selectable.

In other words, the above-described heat recovery priority heating control enables efficient heat recovery, but on the other hand, may require a considerable amount of time before hot water can be used. In other words, when the hot water heating means is the above-described heat exchanger, the hot water can be used in a relatively short time by heating the hot water in the hot water storage tank having a large amount of stored heat. If the hot water is heated, it takes a relatively long time before the hot water can be used, which causes inconvenience in actual use.

However, due consideration has been paid to that point,
A hot water recovery priority heating mode in which the heat recovery priority heating control is executed, and a hot water supply in which the hot water storage tank having the largest amount of stored heat is selected as the hot water storage tank to be heated and the hot water supply priority heating control for heating the hot water in the hot water storage tank is performed. Since it is configured to be selectable between the priority heating mode and, for example, when priority is given to heat recovery, the heat recovery priority mode is selected, and when priority is given to hot water supply, the hot water supply priority heating mode is selected. Accordingly, it is possible to execute the calorific value hot water storage control according to the user's request.

According to the fourth aspect of the present invention, the hot and cold water heating means is constituted by a heat exchanger using heat exhausted from the engine driving the generator as a heat medium, and controls the operation of the engine. The control means is configured to be freely switchable between a power generation priority mode in which the engine is driven in accordance with an electric power request and an exhaust heat priority mode in which the engine is driven in accordance with an exhaust heat request of the heat exchanger. In the heat amount storage control, the heat amount recovery priority heating mode is selected when the power generation priority mode is selected, and the hot water supply priority heating mode is selected when the heat release priority mode is selected. I have.

That is, since the hot and cold water heating means is constituted by a heat exchanger using the exhaust heat from the engine for driving the generator as a heat medium, the hot and cold water is heated using the exhaust heat of the engine for driving the generator. Of course, the heat can be heated, and by executing the above-described heat recovery priority heating control and hot water use-up control, the exhaust heat of the engine can be efficiently recovered, and the hot water at a temperature at which hot water can be supplied can be used effectively without waste. it can. In the power generation priority mode in which the power supply is prioritized, in other words, by executing the heat recovery priority heating control in a state where the engine is driven irrespective of the hot water usage state,
Exhaust heat of the engine can be recovered efficiently,
In the waste heat priority mode that gives priority to hot water supply using waste heat,
Executing the hot water supply priority heating control enables hot water supply according to the user's request.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a hot-water storage system of the present invention is applied to a cogeneration system will be described with reference to the drawings. This cogeneration system generates electricity with a gas engine,
As shown in FIG. 1, hot water is supplied by using exhaust heat of a gas engine. The gas engine 1 includes a gas engine 1 and a generator 2 driven by the gas engine 1 as another device. The gas engine 1 is driven by burning the fuel gas to be generated, and the generator 2 is driven by the gas engine 1 to supply power to a desired place, and the exhaust gas after combustion is discharged through the exhaust passage 4 to the apparatus. It is configured to discharge to the outside.

The gas engine 1 is provided with a cooling water outgoing path 5a for supplying cooling water and a cooling water returning path 5b for returning the cooling water to the radiator 6. The cooling water outgoing path 5a includes:
A cooling water pump 7 for circulating cooling water is provided,
The cooling water return path 5b is provided with an exhaust gas heat exchanger 8 for exchanging heat with the exhaust gas flowing through the exhaust path 4 to heat the cooling water. A hot water heat exchanger 10 as hot / cold water heating means is connected between the cooling water outgoing passage 5a and the cooling water return passage 5b in a state of bypassing the radiator 6 via a heat exchanger water passage 9; A switching three-way valve 11 is provided at a connection point between the cooling water return path 5b and the cooling water return path 5b.

This hot water supply equipment includes first and second two hot water storage tanks 12A and 12B. A first outgoing path 13a is provided at the bottom of the first hot water storage tank 12A, and a second hot water storage tank 12B is provided at the bottom of the second hot water storage tank 12B. The second outgoing path 13b is connected to the first outgoing path 13
a and the second outgoing path 13b are connected to the outgoing path 13 to the hot water heat exchanger 10 via a circulation switching three-way valve 14,
A circulation pump 15 is provided in the outgoing path 13. The return path 16 from the hot water heat exchanger 10 includes a first return path 16a connected to the first hot water storage tank 12A and a second return path 16a.
Branched into a second return path 16b connected to the hot water storage tank 12B, and the first hot water storage tank 12A is connected to the first outgoing path 13a,
Via outgoing path 13, return path 16, first return path 16a,
The second hot water storage tank 12B is connected to the second outgoing path 13b and the outgoing path 1
3, connected in parallel to the hot water heat exchanger 10 via the return path 16 and the second return path 16b.

The first hot water storage tank 12A has a first
A hot water supply passage 17a is provided above the second hot water storage tank 12B.
The hot water supply path 17b is connected, the first hot water supply path 17a and the second hot water supply path 17b are connected to the hot water supply path 17,
At the bottom of the hot water storage tank 12A, a first water supply passage 18a is provided.
A second water supply passage 18b is connected to the bottom of the hot water storage tank 12B, and the first water supply passage 18a and the second water supply passage 18b are
It is connected to the water supply passage 18 via a water supply switching three-way valve 19. The water supply path 18 and the hot water supply path 17 are connected by a bypass path 20, and a connection point between the bypass path 20 and the hot water supply path 17 includes hot water from the first hot water storage tank 12 </ b> A or the second hot water storage tank 12 </ b> B and a water supply path. A mixing valve 21 for mixing water from the mixing valve 18 is provided, a hot water supply thermistor 22 is provided in the hot water supply path 17 upstream of the mixing valve 21, and a mixed hot and cold water is provided in the downstream hot water supply path 17. A hot water temperature thermistor 23 for detecting the temperature of the water is provided, and a water supply thermistor 24 for detecting the water supply temperature is provided in the water supply passage 18.

That is, the first outgoing path 13a, the second outgoing path 13b, the circulation switching three-way valve 14, the outgoing path 13, the circulating pump 15, the return path 16, the first return path 16a, and the second return path 16b First and second hot water storage tanks 12
A circulating means A for selectively circulating the hot and cold water in the hot water heat exchanger 10 in the hot water A and the hot water heat exchanger 10 is provided. Water supply channel 1
8, the first and second hot water storage tanks 12A and 12 are provided by a three-way valve 19, a first water supply path 18a, a second water supply path 18b, a first hot water supply path 17a, and a second hot water supply path 17b.
Hot water supply means B for selectively supplying hot water in B to hot water supply path 17
And a gas combustion type instantaneous water heater 25 is connected to the hot water supply path 17, and a water supply path 26 is connected to the gas instantaneous water heater 25, and a hot water tap 27 is provided. The hot water path 28 is connected.

The first hot water storage tank 12A has its first
An upper thermistor 29a, an intermediate thermistor 29b, and a lower thermistor 29c for detecting the temperature of hot and cold water in the hot water storage tank 12A at three points in the vertical direction are provided.
The three thermistors 29a, 29b, and 29c are provided at different positions in the vertical direction, and the first thermistor 29a, 29b, and 29c constitute first storage calorie detection means 29 for detecting the amount of heat stored in the first hot water storage tank 12A. Have been. Similarly, the second hot water storage tank 12B has the second hot water storage tank 1
Three thermistors, an upper thermistor 30a, an intermediate thermistor 30b, and a lower thermistor 30c, for detecting the temperature of hot and cold water in 2B at three points in the vertical direction are provided in different positions in the vertical direction. The two thermistors 30a, 30b, 30c constitute a second stored heat quantity detecting means 30 for detecting the stored heat quantity stored in the hot water in the second hot water storage tank 12B.

The operation of the cogeneration system having such a configuration is controlled by a computer-based control device H. Therefore, as shown in FIG. 2, control device H includes hot water supply control means H1 for performing hot water supply operation and engine control means H2 for controlling the operation of gas engine 1. Hot water supply control means H1, engine control means H2, Are configured to be communicable. The hot water supply control means H1 includes a hot water supply thermistor 22,
Hot water thermistor 23, water supply thermistor 24, first and second
And the operation of the circulation switching three-way valve 14, the circulation pump 15, the water supply switching three-way valve 19, the mixing valve 20, etc., based on the input information. Is configured to be controlled. The engine control means H2 includes a power generation priority mode in which the gas engine 1 is driven in accordance with a power request and an exhaust heat priority mode in which the gas engine 1 is driven in accordance with a heat release request to the hot water heat exchanger 10. , A mode changeover switch SW is connected to control operations of the gas engine 1, the cooling water pump 7, the changeover three-way valve 11, and the like.

Next, the operation of the hot water supply control by the control device H will be described with reference to the flowchart of FIG. When the operation switch of the remote controller (not shown) is turned ON or the start of the hot water supply operation is automatically instructed by the operation of the timer (step 1), the calorie storage control for sequentially heating the hot and cold water in both hot water storage tanks 12A and 12B. Is executed. In this heat amount storage control, if the waste heat priority mode is selected by the mode changeover switch SW, the hot water supply priority heating mode is selected and the hot water supply priority heating control is executed. The recovery priority heating mode is selected, and the heat recovery priority heating control is executed (steps 2 to 4).

In the hot water supply priority heating control, a large amount of heat is stored in the first and second hot water storage tanks 12A and 12B which are not selected as hot water supply sources in execution of the hot water supply control described later. One of the storage tanks 12A, 12B is the hot water storage tank 12A,
12B, and the hot water storage tanks 12A, 12B
The hot water inside is heated. For example, both hot water storage tanks 12A,
12B is not selected as the hot water supply source, and the first thermistor 29 detects the upper thermistor 29
a and the intermediate thermistor 29b detect a temperature of 75 ° C. or more, the lower thermistor 29c detects a temperature of less than 75 ° C., and the second stored heat detecting means 30 uses the upper thermistor 30a, the intermediate thermistor 30b, and the lower thermistor 30c. If the temperature of all of them is 75 ° C. or higher, the second hot water storage tank 12B is determined to have a larger amount of stored heat, and the second hot water storage tank 12B is selected as a tank to be heated. Water is heated.

The heating of the hot water in the second hot water storage tank 12B is performed by operating the circulation switching three-way valve 14 so that the second outgoing path 13b on the second hot water storage tank 12B side communicates with the outgoing path 13 and the circulation. The pump 15 is operated, and the hot water in the second hot water storage tank 12B is circulated and supplied to the hot water heat exchanger 10 via the second outgoing path 13b, the outgoing path 13, the return path 16, and the second return path 16b. Since the cooling water after being heated by cooling the gas engine 1 and further heated by the exhaust gas heat exchanger 8 is circulated and supplied to the hot water heat exchanger 10 by the operation of the cooling water pump 7. The hot and cold water in the second hot water storage tank 12B is circulated while being heated by the hot water heat exchanger 10. Since the temperature of the heated cooling water circulated in the hot water heat exchanger 10 is about 80 ° C., the hot water in the second hot water storage tank 12B is circulated and heated at a relatively high speed over and over again. When the lower thermistor 30c in the second stored heat amount detecting means 30 detects a temperature of 75 ° C. or higher, it is determined that the stored heat amount has reached the set maximum stored heat amount, and the heat amount storage control for the second hot water storage tank 12B ends. After that, the lower thermistor 30c
When a temperature lower than 5 ° C. is detected, the heat storage control for the second hot water storage tank 12B is restarted.

If the first hot water storage tank 12A is selected as a hot water storage tank to be heated and the hot water in the first hot water storage tank 12A is heated, the circulation switching three-way valve 14 is used.
Are switched, the first outgoing path 13a on the first hot water storage tank 12A side is communicated with the outgoing path 13, and the first hot water storage tank 1
The hot and cold water in 2A is circulated and supplied to the hot water heat exchanger 10 via the first outgoing path 13a, the outgoing path 13, the return path 16, and the first return path 16a to be heated. Then, when the lower thermistor 29c of the first storage calorie detecting means 29 detects a temperature of 75 ° C. or higher, it is determined that the storage calorie of the first hot water storage tank 12A has reached the set maximum storage calorie, and the calorie storage control ends. At the same time, the switching three-way valve 11 is switched, and the cooling water of the gas engine 1 is circulated and supplied to the radiator 6 side.

The heat recovery priority heating control includes first and second heat control.
Of hot water storage tanks 12A and 12B not selected as a hot water supply source during execution of hot water supply control.
2A and 12B, the storage tanks 12A and 12B having a smaller amount of stored heat are the hot water storage tanks 12A and 1 to be heated.
2B, the hot water in the hot water storage tanks 12A and 12B is heated. For example, as in the above-described example, both hot water storage tanks 12A and 12B are not selected as hot water supply sources, and the first stored heat amount detecting means 29
The upper thermistor 29a and the intermediate thermistor 29b are 75
℃ or more and the lower thermistor 29
When C detects a temperature of less than 75 ° C. and the second thermistor 30 detects a temperature of 75 ° C. or more in all of the upper thermistor 30a, the intermediate thermistor 30b, and the lower thermistor, the first hot water storage tank 12A has a higher temperature. It is determined that the amount of stored heat is small, and the first hot water storage tank 12A is selected as a tank to be heated, and the hot water in the first hot water storage tank 12A is heated.

As described above, when the engine control means H2 is in the exhaust heat priority mode, the hot water supply priority heating mode is selected in the heat quantity storage control, and the stored heat quantity in the first and second hot water storage tanks 12A and 12B is selected. The storage tanks 12A and 12B, which have a larger amount, are hot water storage tanks 12A and 12B to be heated.
B, the hot and cold water in the hot water storage tanks 12A, 12B is heated, and when the engine control means H2 is in the power generation priority mode, the heat quantity storage priority heating mode is selected in the heat quantity storage control, and the first and second heat mode are selected. Hot water storage tank 12
Hot water storage tank 1 of A and 12B having the smaller stored heat quantity
2A and 12B are selected as the hot water storage tanks 12A and 12B to be heated, and the hot water in the hot water storage tanks 12A and 12B is heated.

When the start of hot water supply is instructed by opening the hot water tap 27 (step 5), both hot water storage tanks 12
Hot water supply control for supplying hot and cold water in A and 12B is executed. At this time, if the exhaust heat priority mode is selected, the hot water / water exhaustion control is executed. If the power generation priority mode is selected, the stored heat amount priority control is executed. (Steps 6 to 8).

The hot water running-out control is performed by controlling the upper thermistor 29a in the first storage heat amount detecting means 29, for example, in the first and second hot water storage tanks 12A and 12B, which have the larger amount of stored heat. All of the intermediate thermistor 29b and the lower thermistor 29c detect a temperature of 75 ° C. or higher, and in the second stored calorie detecting means 30, the upper thermistor 30a detects a temperature of 75 ° C. or higher, and the intermediate thermistor 30b and the lower thermistor 30c When a temperature lower than 75 ° C. is detected, it is determined that the first hot water storage tank 12A has a larger amount of stored heat, and the first hot water storage tank 12A is selected as a hot water supply source tank.
Hot water in A is supplied.

More specifically, the three-way valve 19 for switching the water supply is operated to switch the first water supply passage 1 on the first hot water storage tank 12A side.
8 a is communicated with the water supply channel 18, and the water pressure in the first hot water storage tank 12 </ b> A is pushed up by the water supply pressure from the water supply channel 18 to be supplied to the hot water supply channel 17. At this time, the opening of the mixing valve 21 is adjusted based on the detection information from the hot water supply thermistor 22 and the water supply thermistor 24, and the opening of the mixing valve 21 is slightly adjusted based on the detection information from the hot water temperature thermistor 23. Hot water adjusted to, for example, 70 ° C. is supplied to the gas instantaneous water heater 25. The hot water supplied to the gas instantaneous water heater 25 is further heated by the gas instantaneous water heater 25 as necessary, and the water from the water supply passage 26 is mixed, and set by a remote controller (not shown). Hot water at a temperature is discharged from the hot water tap 27.

Even if the stop of the hot water supply is instructed by the closing operation of the hot water tap 27, if the upper thermistor 29a of the first storage calorie detecting means 29 detects the temperature of 75 ° C. or more,
Since it is determined that the stored heat amount of the first hot water storage tank 12A is equal to or greater than the set lower limit heat amount, the water supply switching three-way valve 19 is not switched, and the first water supply passage 18a on the first hot water storage tank 12A side is connected to the water supply passage 18. It is maintained in the state. Therefore,
Thereafter, when the hot water tap 27 is opened and the start of hot water supply is instructed, hot water in the first hot water storage tank 12A is supplied again, and the upper thermistor 29a of the first stored calorie detecting means 29 is supplied.
Detects a temperature lower than 75 ° C., the first hot water storage tank 12
It is determined that the stored heat amount of A has reached the set lower limit stored heat amount, and the second hot water storage tank 12B is selected as the tank of the hot water supply source. Specifically, the water supply switching three-way valve 19 is switched, and the second water supply passage 18 on the second hot water storage tank 12B side is operated.
b is communicated with the water supply passage 18, and the hot water in the second hot water storage tank 12 </ b> B is supplied to the hot water supply passage 17 by the water supply pressure from the water supply passage 18.

That is, one hot water storage tank, for example, the first hot water storage tank 12
After A is once selected as the hot water supply source, not only the hot water supply by the present hot water supply start command but also the hot water supply by the subsequent hot water supply start instruction until the storage heat amount of the selected first hot water storage tank 12A reaches the set lower limit heat amount. In this configuration, after the hot water in the selected first hot water storage tank 12A is supplied, hot water running-out control for selecting another hot water storage tank, that is, the second hot water storage tank 12B, as a hot water supply source is performed.

In the above-described hot water running-up control, when the start of hot water supply is instructed by opening the hot water tap 27,
When both the lower thermistors 29c and 30c detect a temperature lower than 75 ° C. in the first and second stored heat quantity detecting means 29 and 30, if there is no hot water storage tank whose stored heat quantity has reached the set maximum stored heat quantity. Judgment is made, the three-way valve 19 for switching water supply is operated to switch, and both the first water supply path 18a on the first hot water storage tank 12A side and the second water supply path 18b on the second hot water storage tank 12B side are disconnected from the water supply path 18. It is. In that case, the water from the water supply channel 18 is directly supplied to the gas instantaneous water heater 25 via the bypass line 20 and heated by the gas instantaneous water heater 25, and then the water from the water supply channel 26 is mixed. Then, hot and cold water at a temperature set by a remote controller (not shown) is discharged from hot water tap 27. That is, in the hot water supply control, when the hot water supply start command is issued, the hot water supply is not started if there is no hot water storage tank that has heated the hot water until the stored heat amount reaches the set maximum stored heat amount.

However, as described above, for example, when the first hot water storage tank 12A is selected as the tank of the hot water supply source and the hot water in the first hot water storage tank 12A is supplied,
The upper thermistor 29a of the first storage calorie detecting means 29
If a temperature lower than 5 ° C. is detected and it is determined that the stored heat amount of the first hot water storage tank 12A has reached the set lower limit stored heat amount, even if the stored heat amount of the second hot water storage tank 12B is smaller than the set upper limit stored heat amount. However, the second hot water storage tank 12B is selected as the hot water supply source tank,
Continue to supply hot water from. In other words, in the hot water supply control, when the hot water is consumed up to the set lower limit storage calorie in the hot water storage tank selected as the hot water supply source with continuing the hot water supply,
Even if another hot water storage tank is in the middle of heating less than the set upper limit storage calorie, hot water is supplied from the hot water storage tank.

The storage calorie priority control is performed in both hot water storage tanks 1
Hot water storage tank 1 of 2A and 12B that has the larger amount of stored heat
2A, 12B, for example, in the first storage calorie detecting means 29, the upper thermistor 29a, the intermediate thermistor 29b,
All of the lower thermistors 29c detect a temperature of 75 ° C. or higher, and in the second storage calorie detecting means 30, the upper thermistor 30a and the intermediate thermistor 30b detect a temperature of 75 ° C. or higher, and the lower thermistor 30c detects a temperature of 75 ° C. or lower. When the temperature is detected, it is determined that the first hot water storage tank 12A has a larger amount of stored heat, the first hot water storage tank 12A is selected as a hot water supply tank, and hot water in the first hot water storage tank 12A is supplied. . Then, when there is a next hot water supply start command, the hot water storage tanks 12A, 12A having the larger stored heat amount at that time.
B: For example, in the first stored calorie detecting means 29, only the upper thermistor 29a detects a temperature of 75 ° C. or more, and in the second stored calorie detecting means 30, the upper thermistor 30
a and the intermediate thermistor 30b detect a temperature of 75 ° C. or higher, it is determined that the second hot water storage tank 12B has a larger amount of stored heat, and the second hot water storage tank 12B is selected as a hot water supply source tank. Hot water in the two hot water storage tanks 12B is supplied.

That is, when the engine control means H2 is in the power generation priority mode, in the hot water supply control, once the hot water supply is interrupted, the hot water storage tank having the largest amount of stored heat at that time according to the next hot water supply start command. In this configuration, the second hot water storage tank 12B is selected as a hot water supply source to perform a stored heat quantity priority control for supplying hot water.

Also in this stored heat amount priority control, as described above, when the hot water supply start command is issued, if there is no hot water storage tank for heating the hot water until the stored heat amount reaches the set maximum stored heat amount, the hot water supply When the hot water of the hot water storage tank selected as the hot water supply source is consumed up to the set lower limit storage calorie as the hot water supply is continued, another hot water storage tank is less than the set upper limit storage calorie. It is configured to supply hot water from the hot water storage tank even during heating.

[Other Embodiments] (1) In the above embodiment, an example was described in which two hot water storage tanks were provided, but the present invention can be implemented using three or more hot water storage tanks. In this case, when the hot water supply priority heating mode is selected and the hot water supply priority heating control is performed in the heat energy storage control, the hot water storage tank having the largest stored heat amount among the three or more hot water storage tanks is the hot water storage tank to be heated. When the heat recovery priority heating mode is selected and the heat recovery priority heating control is executed, the hot water storage tank having the smallest stored heat quantity among the three or more hot water storage tanks is the hot water storage tank to be heated. Will be configured to be selected. Also, the example has been described in which the heat recovery priority heating control is executed only when the engine control means H2 is set to the power generation priority mode, but the engine control means H2 is set to the exhaust heat priority mode. It is also possible to configure so that the heat recovery priority heating control is executed even when the control is performed.

(2) In the above embodiment, in the heat quantity storage control, if the engine control means H2 is in the exhaust heat priority mode, the hot water supply priority heating mode is selected, and if the engine control means H2 is in the power generation priority mode, Although the configuration in which the heat recovery priority heating mode is selected has been described, for example, a mode change switch or the like is provided to freely switch between the hot water supply priority heating mode and the heat recovery priority heating mode regardless of the mode of the engine control means H2. It can also be configured to be selectable.

(3) In the above embodiment, in the hot and cold water depletion control, hot water supply from the selected hot water storage tank is executed until the stored heat quantity of the hot water storage tank selected as the hot water supply source reaches the set lower limit heat quantity. Although an example is shown in which another hot water storage tank is configured to be selected as a hot water supply source,
Based on the elapsed time since the selection of the hot water storage tank as the hot water supply source, hot water is supplied from the selected hot water storage tank until the elapsed time reaches the set time, and then another hot water storage tank is connected to the hot water supply source. It can also be configured to select as

(4) In the above embodiment, in the hot water supply control and the stored heat quantity priority control in the hot water supply control, when the hot water supply start command is issued, the hot water is heated until the stored heat quantity reaches the set maximum stored heat quantity. Although the example in which the hot water supply is not started when the tank does not exist has been described, the hot water supply from the hot water storage tank is started even when there is no hot water storage tank in which the stored heat reaches the set maximum stored heat. You can also. For example, in the first stored calorie detecting means 29 of the first hot water storage tank 12A, even if the lower thermistor 29c detects a temperature lower than 75 ° C., the intermediate thermistor 29b or the upper thermistor 29a detects a temperature higher than 75 ° C. 75 in the first hot water storage tank 12A
The first hot water storage tank 12
It is also possible to configure so that hot water supply from A is started.

(5) In the previous embodiment, in the hot water supply control and the stored heat quantity priority control in the hot water supply control, the hot water in the hot water storage tank selected as the hot water supply source is consumed to the set lower limit stored heat quantity as the hot water supply is continued. When the hot water storage tank is selected as the hot water supply source, another hot water storage tank is configured to supply hot water from the hot water storage tank even during heating below the set upper limit storage heat amount. When hot water is consumed up to the set lower limit storage calorie, if another hot water storage tank is less than the set upper limit storage calorie, hot water supply from another hot water storage tank may not be performed.

(6) In the above embodiment, after the heat storage capacity of the hot water storage tank has reached the set maximum storage heat quantity and the heat quantity storage control has been completed, if the heat storage quantity of the hot water storage tank falls below the set maximum storage heat quantity, the heat storage capacity is reduced. Although the example in which the control is restarted has been described, various changes can be made to the restart time of the heat storage control. For example, in the case of the first hot water storage tank 12A, when the intermediate thermistor 29b of the first stored calorie detecting means 29 detects a temperature lower than 75 ° C., the calorie storage control is restarted, or the upper thermistor 29a is When the temperature lower than 75 ° C. is detected, the calorific value storage control may be restarted.

(7) In the above embodiment, an example is shown in which the hot water heat exchanger 10 using the exhaust heat from the gas engine 1 driving the generator 2 as a heat medium is used as the hot and cold water heating means.
For example, the present invention can be applied to an engine heat pump type air conditioner using a gas engine, and can be replaced with a hot water heat exchanger using exhaust heat from the gas engine or a condenser as a heat medium. The invention is not limited to one, and a plurality of hot and cold water heating means may be connected in series or connected in parallel. Also, an example is shown in which a gas instantaneous water heater 25 is connected to the hot water supply path 17 so that hot water at a desired temperature is supplied from a hot water tap 27 provided in a hot water outlet path 28 of the gas instantaneous water heater 25. , Gas instantaneous water heater 25
The use of hot water from the hot water supply path 17 is various, for example, the hot water from the hot water supply path 17 is heated by the hot water from the hot water supply path 17, or the hot water in the bathtub of the bath is heated. Can be changed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a cogeneration system.

FIG. 2 is a block diagram of a control device.

FIG. 3 is a flowchart showing the operation of hot water supply control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Generator 10 Heat exchanger 12A, 12B Hot water storage tank 17 Hot water supply path 29, 30 Heat storage amount detection means A Circulation means B Hot water supply means H1 Hot water supply control means H2 Engine control means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Sano 1-15-1 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Inside Harman Co., Ltd. (72) Inventor Akihiko Yasuda 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka No. Harman Co., Ltd. (72) Yumi Tanaka, Inventor 1-15-1 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Prefecture (72) Inventor Kenji Kenji 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka No. Harman Co., Ltd. F-term (reference) 3L025 AD09

Claims (4)

[Claims] 1. A plurality of hot water storage tanks, and a circulating means for selectively circulating the hot water in the plurality of hot water storage tanks to the hot water heating means so that the hot water in the plurality of hot water storage tanks is heated by the hot water heating means. Hot water supply means for selectively supplying hot water in the plurality of hot water storage tanks to a hot water supply path; and for each of the plurality of hot water storage tanks, storage heat quantity detection means for separately detecting a stored heat quantity stored in hot water. A hot water supply control means for performing a hot water supply operation, wherein the hot water supply control means selects one of the plurality of hot water storage tanks as a hot water supply source hot water storage tank in accordance with a hot water supply start command, Hot water supply control for operating the hot water supply means so as to supply hot water in the hot water storage tank; and for the hot water storage tank that is not selected as the hot water supply source among the plurality of hot water storage tanks, In a heating mode in which the hot water is heated until the set maximum stored heat quantity, the heat quantity storage control for operating the circulation means based on the detection information of the stored heat quantity detection means so as to sequentially heat the hot water in the plurality of hot water storage tanks. In the hot water supply type hot water supply equipment configured to execute, the hot water supply control means, in the calorie storage control, a hot water storage tank having the smallest stored heat amount among the plurality of hot water storage tanks as a hot water storage tank to be heated. A hot-water storage type hot water supply system configured to select and perform heat recovery priority heating control for heating hot water in the hot water storage tank. 2. The hot water supply control means, in the hot water supply control, selects a hot water storage tank having the largest amount of stored heat as the hot water supply source and once selects one hot water storage tank in accordance with the hot water supply start command. Later
Until the stored heat amount of the selected hot water storage tank reaches the set lower limit heat amount, or until the elapsed time after selecting the hot water storage tank as the hot water supply source reaches the set time, not only hot water supply by the present hot water supply start command, In the subsequent hot water supply by the hot water supply start command, the hot water supply of the selected hot water storage tank is supplied, and then the hot water use-up control of selecting another hot water storage tank as the hot water supply source is performed, and the calorie storage is performed. 2. The hot-water storage type according to claim 1, wherein, in the control, a hot-water storage tank that is not selected as a hot-water supply source during execution of the hot-water supply control is selected as a hot-water storage tank to be heated. 3. Hot water supply equipment. 3. The hot water supply control means includes: in the heat storage control, a heat recovery priority heating mode for executing the heat recovery priority heating control; and heating the hot water storage tank having the largest storage heat amount among the plurality of hot water storage tanks. The hot-water supply type hot water supply according to claim 1 or 2, wherein the hot-water supply type hot-water supply according to claim 1 or 2 is selected as a target hot-water storage tank and is selectively configured to be in a hot-water supply priority heating mode for executing hot-water supply priority heating control for heating hot water in the hot water storage tank. Facility. 4. The hot water / water heater comprises a heat exchanger using exhaust heat from an engine for driving a generator as a heat medium, and an engine controller for controlling the operation of the engine according to a power demand. The power generation priority mode for driving the engine and the exhaust heat priority mode for driving the engine in accordance with the exhaust heat request of the heat exchanger are configured to be freely switchable, and the hot water supply control unit includes: The hot water storage type according to claim 3, wherein the heat recovery priority heating mode is selected in the power generation priority mode, and the hot water supply priority heating mode is selected in the exhaust heat priority mode. Hot water supply equipment.