JP6021599B2 - Thermal storage device and cogeneration system - Google Patents

Description

The present invention stores a heat storage fluid, a heat storage tank having an upper connection port in the upper portion and a lower connection port in the lower portion,
A heating circuit that heats the heat storage fluid in a form that returns the heat storage fluid taken out from the lower connection port to the upper connection port after being heated by a heating unit,
A heat storage device including a heat dissipation circuit that radiates heat of the heat storage fluid in a form in which the heat storage fluid taken out from the upper connection port is radiated by a heat radiating unit and then returned to the lower connection port, and a cogeneration system including the heat storage device About the system.

As a conventional heat storage device, there is provided a heat storage tank for storing hot water as a heat storage fluid, heating operation for heating the hot water by circulating hot water in the heating circulation circuit, and circulating hot water in the heat dissipation circulation circuit Thus, there is known one that is configured to be able to execute the heat dissipation operation for radiating the hot water individually or simultaneously.
By executing this heating operation alone, the low-temperature hot water existing in the lower layer of the heat storage tank is taken out from the lower connection port to the heating circuit, and the hot water taken out is heated in the heating unit, and the heated high temperature The hot water is returned from the upper connection part to the upper layer of the heat storage tank. Accordingly, hot water is stored in the heat storage tank in a state where a temperature stratification is formed with the upper layer being a high-temperature hot water layer and the lower layer being a low-temperature hot water layer.

The heat storage device disclosed in Patent Document 1 is configured to be capable of performing a heat radiation operation that simultaneously performs a heating operation and a heat radiation operation.
As a configuration for maintaining a good temperature stratification of the heat storage tank in this heat radiation operation, the heat radiation return pipe, which is the return pipe from the heat radiation part in the heat radiation circuit, goes to the heating part in the heat circulation circuit. It is connected to a heating forward conduit that is a conduit, and a switching valve is provided at a connection portion between the heat radiation return conduit and the heating forward conduit. In the heat radiation operation, the switching valve is operated, and the hot water returned from the heat radiation return line of the heat radiation circuit does not flow into the lower part of the heat storage tank from the lower connection port, all of which is heated by the heating circuit. Supplied to the outgoing pipeline.
As a result, the medium and high temperature hot water returned from the heat radiation return pipe is prevented from flowing into the lower layer of the heat storage tank where the low temperature hot water exists, and the temperature stratification is maintained at a good level.

JP 2011-145067 A

  In the heat storage device disclosed in Patent Document 1, a switching valve is required at the connection portion between the heat radiation return pipe and the heating forward pipe in order to execute the heat radiation operation while maintaining a good temperature stratification of the heat storage tank. In addition, since this heating and heat radiation operation prohibits the flow of hot water into the lower layer of the heat storage tank, hot hot water heated in the heating circuit is supplied to the upper layer of the heat storage tank from the upper connection port. However, all of the hot water was supplied to the heat dissipation circuit.

  The present invention has been made paying attention to such points, and its purpose is to maintain a good temperature stratification of the heat storage tank during the heat radiation operation in the heat storage device and the cogeneration system including the heat storage device. However, the heat storage fluid heated in the heating circulation circuit can be received and stored in the upper layer of the heat storage tank, and further, a technique capable of improving the thermal efficiency is provided.

The heat storage device according to the present invention for achieving this object is as follows:
A heat storage tank for storing a heat storage fluid, having an upper connection port at the top and a lower connection port at the bottom;
A heating circuit that heats the heat storage fluid in a form that returns the heat storage fluid taken out from the lower connection port to the upper connection port after being heated by a heating unit,
In the form of returning the heat storage fluid taken out from the upper connection port to the lower connection port after radiating heat at the heat radiating section, a heat storage device comprising a heat dissipation circuit that radiates heat of the heat storage fluid,
The first characteristic configuration is
An inverted container-shaped fluid receiving member that is disposed below the heat storage tank and forms a stay space inside;
As the lower connection port,
A lower connection port for heating, which is connected to an inflow side of the heating unit in the heating circulation circuit and is arranged to take out the heat storage fluid from the staying space to the heating unit;
A heat radiation lower connection port arranged to return the heat storage fluid from the heat radiation part to the staying space connected to the outflow side of the heat radiation part in the heat radiation circuit, respectively,
The fluid receiving member includes a cylindrical or rectangular tube-shaped side wall portion extending along the vertical direction and a ceiling portion covering a cylindrical upper end portion of the side wall portion, and the side wall portion of the fluid receiving member. bottom corresponding to the cylindrical lower end portion of the opening, the lower side of the ceiling portion of the retaining space in the side wall portion of the fluid receiving member, escape air communicating said retaining space to the outside of the fluid receiving member The hole is formed.
Here, in the present application, the inverted container shape means a shape in which a concave container is turned upside down, for example, a cylindrical or rectangular side wall portion extending along the vertical direction, and the side wall portion of the side wall portion. The shape etc. which consist of a ceiling part which covers a cylindrical upper end part are included.

Moreover, the characteristic configuration of the cogeneration system according to the present invention for achieving this object is as follows:
A cogeneration device that generates heat and electricity, and a heat storage device that stores heat of the cogeneration device,
The heat storage device is configured as a heat storage device according to the present invention, and stores hot water as the heat storage fluid heated by the heat and power supply device as the heating unit in the heat storage tank.

According to the first characteristic configuration of the heat storage device according to the present invention and the characteristic configuration of the cogeneration system according to the present invention, the inflow side of the heating unit in the heating circulation circuit serves as a lower connection port provided in the lower part of the heat storage tank. In the configuration in which the connected lower connection port for heating and the lower connection port for heat radiation to which the outflow side of the heat radiation part in the heat radiation circuit is connected are provided separately, a fluid receiving member is provided below the heat storage tank. Yes . The fluid receiving member includes a cylindrical or rectangular tube-shaped side wall portion extending in the vertical direction, and a ceiling portion that covers a cylindrical upper end portion of the side wall portion, and the tubular shape of the side wall portion of the fluid receiving member. The bottom part corresponding to the lower end part of is opened. Flow of the heat storage fluid flowing into the lower layer of the thermal storage tank via the heat radiating lower connection port from the heat circulation circuit release is provided received inside the retaining space of the fluid receiving member, disturbance of temperature stratification due to the flow is suppressed The
Also, the heat storage fluid returned from the heat dissipation circuit to the lower layer of the heat storage tank and flowing into the stay space of the fluid receiving member should be positively supplied from the stay space to the heating circuit via the lower connection port for heating. become. As a result, even when a medium-to-high-temperature heat storage fluid higher than the temperature of the relatively low-temperature heat storage fluid in the lower layer of the heat storage tank flows into the lower layer of the heat storage tank from the heat dissipation circuit, the upward flow is attenuated in the heat storage tank Thus, since it is led to the lower connection port for heating, disturbance of temperature stratification in the heat storage tank is suppressed.
In addition, since the medium and high temperature heat storage fluid is positively supplied to the heating circuit and heated by the heating unit, compared to the case where the medium and high temperature heat storage fluid flows into the lower layer of the heat storage tank and becomes unusable, The thermal efficiency in the heating part is improved.
In addition, the medium-temperature or low-temperature heat storage fluid discharged from the heat radiating portion flows into the stay space inside the fluid receiving member from the heat radiating side lower connection port, but this fluid receiving member is formed in an inverted container shape. The medium-temperature heat storage fluid having a relatively high temperature can be preferentially retained in the retention space, and the low-temperature heat storage fluid having a relatively low temperature can flow out of the retention space from below. it can. In this way, the staying space can particularly temporarily store the medium-temperature heat storage fluid, so that the stored medium-temperature heat storage fluid can be sequentially led to the heating circuit via the lower connection port for heating. . Thereby, it can suppress more favorably that medium temperature thermal storage fluid diffuses in the lower layer of a thermal storage tank, and can prevent disorder of temperature stratification in a thermal storage tank further.

Furthermore, air (bubbles) may flow into the staying space inside the fluid receiving member arranged below the heat storage tank from the heat dissipation circuit via the heat dissipation lower connection port. The air can escape to the outside of the stay space through the air escape hole.
Thereby, it can suppress that air (bubble) is guide | induced to a heating circulation circuit via the lower connection port for a heating. As a result, when the heating circulation circuit is equipped with a combined heat and power supply device such as a fuel cell as a heating unit, air (bubbles) flows through the heating circulation circuit, resulting in insufficient cooling of the combined heat and power supply device. Can be prevented.
Further, since the air escape hole is disposed below the ceiling portion of the retention space in the side wall portion of the fluid receiving member, an air layer filled with air is formed above the air escape hole in the retention space. Will be.
And since the thermal conductivity of this air is lower than that of a heat storage fluid such as water, this air layer causes a medium-high temperature heat storage fluid existing in the stay space and a low-temperature heat storage fluid existing below the heat storage tank. The heat exchange is suppressed.
Therefore, when the medium and high temperature heat storage fluid returned from the heat circulation circuit flows into and stays in the stay space, the heat of the medium and high temperature heat storage fluid is deprived by the low temperature heat storage fluid existing in the lower layer of the heat storage tank. Is suppressed. Therefore, the medium-high temperature heat storage fluid is guided to the heating lower connection port while being kept warm and is supplied to the heating circuit, so that the thermal efficiency in the heating section is further improved.
Therefore, according to the present invention, the heat storage fluid heated in the heating circulation circuit can be received and stored in the upper layer of the heat storage tank while maintaining a good temperature stratification of the heat storage tank during the heat radiation operation. Furthermore, a heat storage device that can improve thermal efficiency can be realized.
Further, in the cogeneration system that heats the heat storage fluid by the heat generated by the combined heat and power supply device in the heating circuit, the heat storage device according to the present invention is provided in such a form that the heat storage tank stores hot water as the heat storage fluid. The same operational effects as the heat storage device according to the present invention can be obtained.

In addition, in this invention, the downward direction of the thermal storage tank in which a fluid receiving member is provided is an area | region below a center site | part inside a thermal storage tank in an up-down direction, Specifically, 2-20 cm from the bottom face of a thermal storage tank. It is assumed that
Moreover, when the lower limit position of the region where the fluid receiving member of the heat storage tank is provided is lower than 2 cm from the bottom surface of the heat storage tank, the inflow of the heat storage fluid into the heat storage tank is too hindered, and the circulation state of the heat storage fluid is deteriorated. There is a fear. On the other hand, when the upper limit position of the region where the fluid receiving member of the heat storage tank is provided is higher than 20 cm from the bottom surface of the heat storage tank, the upward flow of the heat storage fluid flowing from the lower connection port for heat dissipation is appropriately changed to the lower connection port for heating. There is a possibility that it will not be possible to guide to.
In the present invention, the lower part of the heat storage tank refers to a portion including a lower connection port for heating and a lower connection port for heat dissipation connected to the lower layer of the heat storage tank, and the upper part of the heat storage tank refers to the upper layer of the heat storage tank. The site | part containing the upper connection port connected is shown.

The second characteristic configuration of the heat storage device according to the present invention is in addition to the first characteristic configuration,
Inside the fluid receiving member, a partition wall that partitions the gap facing the side wall portion of the fluid receiving member and the staying space is disposed,
The partition wall has an air receiving hole formed above the air escape hole.

According to the second characteristic configuration of the heat storage device according to the present invention, the gap is formed in a state in which a gap is formed between the fluid receiving member and the side wall of the fluid receiving member, which is disposed below the heat storage tank. Since the partition wall that divides the stagnation space is disposed, a part of the gap is in a state where the heat storage fluid stored in the heat storage tank does not flow. Therefore, the heat exchange between the partition wall and the side wall portion of the fluid receiving member is further suppressed by the presence of the non-flowing heat storage fluid.
Further, the air (bubbles) flowing into the staying space inside the fluid receiving member is allowed to escape to the outside of the staying space through the air receiving hole formed in the partition wall and the air releasing hole formed in the fluid receiving member. Can do.
Moreover, since the air receiving hole formed in the partition wall is disposed above the air escape hole formed in the fluid receiving member, the air receiving hole always faces the air layer. Therefore, it is possible to suppress the medium and high temperature heat storage fluid existing inside the inner receiving member from flowing out through the air receiving hole, and lead as much of the medium and high temperature heat storage fluid as possible to the heating circuit. It can be used effectively.

The third characteristic configuration of the heat storage device according to the present invention is in addition to the second characteristic configuration,
The fluid receiving member is composed of a reverse container-shaped outer receiving member disposed on the outside and a reverse container-shaped inner receiving member disposed on the inner side with a gap with respect to the outer receiving member,
The inner receiving member functions as the partition wall.

According to the third characteristic configuration of the heat storage device according to the present invention, the fluid receiving member disposed below the heat storage tank is between the outer receiving member having an inverted container shape and the inner receiving member functioning as the partition wall described above. Since there is a double structure that is overlapped with a gap (hereinafter sometimes referred to as a “gap between members”) provided, a heat storage stored in the heat storage tank is partly between the member gaps. It will be in the state where the fluid does not flow. Therefore, the heat exchange between the inner receiving member and the outer receiving member is further suppressed by the presence of the non-flowing heat storage fluid.
Further, the air (bubbles) flowing into the staying space inside the fluid receiving member escapes outside the staying space through the air receiving hole formed in the inner receiving member and the air escape hole formed in the outer receiving member. I can do this.
Further, since the air receiving hole formed in the inner receiving member is disposed above the air escape hole formed in the outer receiving member, the member formed between the inner receiving member and the outer receiving member. In the gap, an air layer filled with air flowing in from the air receiving hole is formed above the air escape hole.
And since the thermal conductivity of this air is lower than that of a heat storage fluid such as water, a state where heat exchange between the inner receiving member and the outer receiving member is suppressed by the air layer formed between the member gaps. Thus, the medium-to-high-temperature heat storage fluid existing in the stay space inside the inner receiving member can be kept better.
In addition, since the air receiving hole formed in the inner receiving member is disposed above the air escape hole formed in the outer receiving member, the air receiving hole always faces the air layer. . Therefore, it is possible to suppress the medium and high temperature heat storage fluid existing inside the inner receiving member from flowing out through the air receiving hole, and lead as much of the medium and high temperature heat storage fluid as possible to the heating circuit. It can be used effectively.

In addition to the third feature configuration, the fourth feature configuration of the heat storage device according to the present invention,
The air receiving hole is formed in the upper wall portion of the inner receiving member.

According to the fourth characteristic configuration of the heat storage device according to the present invention, when the air receiving hole and the air escape hole are formed as in the third characteristic configuration, the air receiving hole is formed in the upper wall portion of the inner receiving member. Since it is formed, air (bubbles) supplied to the staying space inside the inner receiving member can be well received in the air receiving hole and guided between the member gaps.
In addition, since the air escape hole disposed below the air receiving hole is formed in the side wall portion of the outer receiving member, the air layer is located above the air escape hole at least above the upper end position in the gap between the members. The air can be discharged well in the form in which the same amount of air as the air added between the member gaps flows out from the upper end portion to the outside.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration of the heat storage device according to the present invention includes:
The heat-dissipating lower connection port is located below the heating lower connection port.

  According to the fifth characteristic configuration of the heat storage device according to the present invention, in the staying space inside the fluid receiving member, the lower connection port for heat radiation is disposed below the lower connection port for heating. Among the medium temperature heat storage fluid that stays, the medium that has a high temperature staying in the upper part can be sequentially led to the heating circuit through the lower connection port for heating.

In addition to the fifth feature configuration, the sixth feature configuration of the heat storage device according to the present invention is:
The heating lower connection port and the heat radiation lower connection port are formed as a tip opening of a pipe inserted upward from the bottom of the heat storage tank,
The heating lower connection port is disposed at a height position close to the ceiling portion of the staying space,
The heat radiation lower connection port is located at a height position close to the lower end of the side surface of the stay space.

According to the sixth characteristic configuration of the heat storage device according to the present invention, in the case where the lower connection port for heating and the lower connection port for heat dissipation are arranged as in the fifth characteristic configuration, the lower connection port is formed at the bottom of the heat storage tank. It can be formed as a tip opening of a pipe inserted upward from the top.
Further, in this case, the heating lower connection port is arranged at a height position close to the ceiling portion of the staying space, so that most of the medium-temperature heat storage fluid staying in the staying space is transferred to the heating lower connection port. To the heating circuit.
On the other hand, by arranging the heat radiation lower connection port at a height close to the lower end of the side surface of the retention space, the medium temperature heat storage fluid discharged upward from the heat radiation lower connection port can be satisfactorily converted into the retention space. It can flow and stay.

The seventh characteristic configuration of the heat storage device according to the present invention is in addition to any of the first to sixth characteristic configurations,
Control means for controlling the circulation flow rate of the heat storage fluid in the heating circulation circuit and the heat dissipation circulation circuit;
In the heating and radiating operation in which the control means circulates the heat storage fluid in both the heating circulation circuit and the heat dissipation circulation circuit to simultaneously heat and release the heat storage fluid, the circulation flow rate of the heat storage fluid in the heat dissipation circulation circuit Is that temperature stratification maintaining control is performed to maintain the temperature below the circulating flow rate of the heat storage fluid in the heating circuit.

Depending on the circulation state of the heat storage fluid, the heat storage fluid is circulated in both the heat circulation circuit and the heat radiation circuit, and the heat storage fluid is heated by the heating unit and the heat storage fluid is radiated simultaneously by the heat radiation unit. An upward flow of the heat storage fluid from the lower side to the upper side in the heat storage tank may occur, and the upward flow causes the stratified hot water to be disturbed.
Therefore, according to the seventh characteristic configuration of the heat storage device according to the present invention, the flow rate of the heat storage fluid flowing into the heat storage tank from the heat dissipation circulation circuit through the heat dissipation lower connection port (hereinafter sometimes referred to as “heat dissipation return flow rate”). Is maintained below the flow rate of the heat storage fluid flowing out from the heat storage tank to the heating circuit via the heating lower connection port (hereinafter sometimes referred to as “heating forward flow rate”). As a result, the inflow / outflow state of the heat storage fluid in the lower part of the heat storage tank is always a state in which the heat storage fluid flows out into the heating circuit more than the heat storage fluid inflow from the heat dissipation circuit. It is possible to suppress the upward flow of the heat storage fluid, and to prevent the stratified hot water from being disturbed.

Further, in the heat storage device according to the present invention, in addition to the seventh characteristic configuration, in the temperature stratification maintenance control, the control means sets the heat release return flow rate to be less than a predetermined margin width with respect to the heating forward flow rate. can do.
As a result, the temperature stratification maintaining control increases the outflow flow rate by a predetermined margin width (for example, a flow rate of about 0.1 to 0.2 l / min) rather than the inflow flow rate of the heat storage fluid in the lower part of the heat storage tank. It can maintain, can suppress reliably that the upward flow of a thermal storage fluid arises in a thermal storage tank, and can prevent disorder of temperature stratification.

In addition to the seventh feature configuration, the heat storage device according to the present invention is an auxiliary heating unit that heats the heat storage fluid flowing through the heat radiation forward pipe that is the forward pipe to the heat radiation part in the heat radiation circuit. And a bypass flow rate adjusting means capable of adjusting a flow rate of the heat storage fluid that bypasses the heat storage tank through the bypass passage, and a bypass flow rate adjusting means that bypasses the heat storage tank in the heat dissipation circulation circuit. In the temperature stratification maintenance control, the bypass flow rate adjusting means and the auxiliary heating unit can be controlled based on the temperature of the heat storage fluid in the radiating forward pipe upstream of the auxiliary heating unit.
As a result, the temperature of the hot water in the radiating forward pipe upstream of the auxiliary heating section is higher than the temperature of the hot water required in the radiating section, and the hot water is introduced from the upper part of the heat storage tank to the radiating forward pipe. In such a case, by increasing the flow rate of the hot water flowing through the bypass path that bypasses the heat storage tank, the temperature of the hot water circulating in the heat radiating circuit can be lowered and maintained at the temperature required by the heat radiating section.
In addition, when the temperature of the hot water in the radiating forward pipe upstream of the auxiliary heating part is lower than the temperature required in the radiating part, the low temperature hot water is supplied to the auxiliary heating part provided in the radiating forward pipe. The temperature can be raised to the temperature required by the heat dissipating part. In addition, if it is this structure, even when the heating part is not heating the hot water, a heat radiation operation can be performed independently.

The schematic block diagram of the cogeneration system provided with the heat storage apparatus of 1st Embodiment Control flow chart for heating operation Control flow chart for heat dissipation operation Control flow diagram for heating and heat dissipation operation Elevated sectional view showing the configuration of the fluid receiving member provided in the lower part of the heat storage tank Elevated sectional view showing the configuration of the fluid receiving member of the second embodiment Elevated sectional view showing the configuration of another form of fluid receiving member Elevated sectional view showing the configuration of another form of fluid receiving member

[First Embodiment]
1st Embodiment of the thermal storage apparatus and cogeneration system which concern on this invention is described based on FIGS.
The cogeneration system shown in FIG. 1 includes a cogeneration device 11 such as a fuel cell that generates heat and electricity, and a heat storage device 100 that stores heat of the cogeneration device 11, and the heat storage device. Reference numeral 100 is configured to store hot water as a heat storage fluid heated by the combined heat and power supply device 11 as a heating unit in the heat storage tank 14.
Hereinafter, the configuration of the heat storage device 100 will be described.

The heat storage device 100 stores hot water, and includes a heat storage tank 14 having an upper connection port 62 in the upper portion and a lower connection port 61 in the lower portion, and a heating circulation circuit C1 that circulates hot water with the heat storage tank 14. And a heat dissipation circuit C2.
The heating circuit C <b> 1 is configured to heat hot water in such a form that hot water taken out from the lower connection port 61 is heated by the combined heat and power supply device 11 and then returned to the upper connection port 62.
On the other hand, the heat radiation circuit C2 is configured to radiate hot water in such a form that the hot water taken out from the upper connection port 62 is radiated by the heat radiation heat exchanger 18 as a heat radiating portion and then returned to the lower connection port 61. Yes.

The heat storage device 100 of the present embodiment has a heating operation in which hot water is heated by circulating hot water in the heating circuit C1, and a heat radiation operation in which heat is radiated by circulating hot water in the heat dissipation circuit C2. Are configured to be executable individually or simultaneously.
And at the time of execution of what is called heating heat radiation operation which performs this heating operation and heat radiation operation simultaneously, maintaining the temperature stratification formed in heat storage tank 14 in a favorable thing, hot water heated in heating circulation circuit C1 is carried out. It can be received and stored in the upper layer of the heat storage tank 14 and can further improve the thermal efficiency. The detailed configuration for that will be described below.

(Heating circuit related)
First, the heating circuit C1 and the related configuration will be described with reference to FIG.
The inflow side of the combined heat and power supply device 11 in the heating circulation circuit C1, in other words, the inflow side of hot water in the heating forward line R1, is connected to the lower heating connection port 61a provided in the lower part of the heat storage tank 14, while the heating circulation circuit The outflow side of the combined heat and power supply device 11 in C1, in other words, the outflow side of hot water in the heating return pipe R2, is connected to the upper connection port 62a for heating provided in the upper part of the heat storage tank 14.

The heating circulation circuit C1 includes, in order from the upstream side thereof, a heating circulation pump 12 that circulates hot water through the heating circulation circuit C1, and a combined heat and power supply device 11 that heats the hot water circulating through the heating circulation circuit C1 with its exhaust heat ( An example of a heating unit) and a first temperature sensor T1 that measures the temperature of hot water heated by the exhaust heat of the combined heat and power supply device 11 are provided.
The hot water heated by the combined heat and power supply device 11 of the heating circuit C1 is supplied to the heat storage tank 14 from the heating return pipe R2 to the upper layer via the heating upper connection port 62a, Low temperature hot water is supplied from the lower layer to the heating forward pipe line R1 through the heating lower connection port 61a. As a result, a so-called temperature stratification is formed in the heat storage tank 14 from the upper layer to the lower layer, in which high-temperature hot water is present in the upper layer and low-temperature hot water is present in the lower layer.

(Related to heat dissipation circuit)
Next, the heat dissipation circuit C2 and the related configuration will be described with reference to FIG.
The inflow side of the heat radiation heat exchanger 18 in the heat radiation circuit C2, in other words, the hot water inflow side of the heat radiation forward line R3, is connected to the heat radiation upper connection port 62b provided in the upper part of the heat storage tank 14, while the heat radiation circulation. The outflow side of the heat dissipation heat exchanger 18 in the circuit C2, in other words, the outflow side of hot water in the heat dissipation return pipe R4, is connected to the lower heat connection port 61b provided in the lower part of the heat storage tank 14. The heat radiation lower connection port 61b is provided as another lower connection port 61 with respect to the heating lower connection port 61a. On the other hand, the heat dissipation upper connection port 62b is provided as another upper connection port 62 with respect to the heating upper connection port 62a in the present embodiment, but may be the same upper connection port 62.
Further, the heat radiation return pipe R4 immediately before the heat radiation lower connection port 61b is provided with a switching valve 13 capable of switching the communication state between the heat radiation return pipe R4 and the water supply path R8 for supplying water from the outside. Yes.
In the heat radiation circuit C2, in order from the upstream side, a heat radiation circulation pump 16 that circulates hot water in the heat radiation circuit C2, a second temperature sensor T2 that measures the temperature of hot water circulating in the heat radiation circuit C2, An auxiliary heat source device 17 that heats hot and cold water with a burner 17a, a heat radiation heat exchanger 18 that exchanges heat between the hot water and the heat medium (an example of a heat radiation unit), and an on-off valve 19 that switches the open / close state of the heat radiation circuit C2. Configured.
The heat medium circulates in a heat medium circulation circuit C3 disposed between the heat radiation heat exchanger 18 and the heat radiation terminal 30, and the heat of the hot water is recovered by the heat radiation heat exchanger 18. At the same time, the recovered heat is radiated at the heat radiation terminal 30. The heat medium circulation circuit C3 is provided with a heat medium circulation pump 32 that circulates the heat medium and an open air type heat medium tank 31 that can store the heat medium.

With such a configuration, when the temperature of hot water flowing through the heat dissipation circuit C2, that is, the temperature measured by the second temperature sensor T2 is lower than the set temperature required by the heat dissipation heat exchanger 18 Then, the burner 17a is operated and the auxiliary heat source unit 17 is used to raise the temperature of the hot water to the set temperature.
A third temperature sensor T3 for measuring the temperature of hot water heated by the auxiliary heat source unit 17 is provided on the downstream side of the auxiliary heat source unit 17 in the heat radiation circuit C2, and the control device 20 The combustion state of the burner 17a is controlled so that the temperature of the three temperature sensor T3 becomes the set temperature.

On the other hand, the heat radiation circuit C2 is provided with a first bypass path R5 that bypasses the heat storage tank 14, and the connection portion between the first bypass path R5 and the heat radiation circulation line R3 of the heat radiation circuit C2 includes: A three-way valve 15 is provided. By controlling the opening state of the three-way valve 15 and increasing the hot water flow rate L3 circulating in the first bypass passage R5, the flow rate of hot water flowing through the heat storage tank 14 side is reduced, and heat dissipation heat exchange is performed. The temperature of the hot water led to the vessel 18 can be lowered.
Thereby, when the temperature of the hot water flowing through the heat radiation circuit C2, that is, the temperature measured by the second temperature sensor T2 is higher than the set temperature required by the heat radiation heat exchanger 18, the first The opening state of the three-way valve 15 is controlled so as to increase the flow rate L3 flowing through the bypass path R5, and the hot water is lowered to the set temperature.

(Related to hot water supply)
Next, the structure relevant to hot water supply is demonstrated based on FIG.
A part of the hot water circulating through the heat radiation circuit C2 is switched to a non-bypass state in which the auxiliary heat source unit 17 flows and a bypass state in which the auxiliary heat source unit 17 is bypassed, to the hot water use location 43 such as a hot water tap. It can be supplied.
In other words, in order to realize a non-bypass state, a part of the hot water flowing through the heat radiation circuit C2 is used in the heat radiation circuit C2 between the auxiliary heat source unit 17 and the heat radiation heat exchanger 18. A hot water supply path R9 leading to the location 43 is connected, and a flow rate adjusting valve 41 capable of adjusting the flow rate of hot water guided for hot water supply is provided in the hot water supply path R9.
In the non-bypass state, the hot water flowing through the auxiliary heat source unit 17 is guided to the hot water use location 43 via the hot water supply path R9.
On the other hand, in order to realize the bypass state, the heat dissipation circuit C2 includes a second bypass path that leads a part of hot water flowing through the heat dissipation circuit C2 to the hot water supply path R9 in a state of bypassing the auxiliary heat source unit 17. R6 is provided.
In the bypass state, hot water that bypasses the auxiliary heat source unit 17 is led to the hot water supply use location 43 through the hot water supply path R9 by flowing the second bypass path R6.

With such a configuration, when the temperature of the hot water in the upper layer of the heat storage tank 14, that is, the temperature of the hot water measured by the fifth temperature sensor T5 is less than the hot water supply set temperature required at the hot water use location 43, By supplying hot water in a non-bypass state, the hot water can be supplied to the hot water supply location 43 in a state where the hot water is heated and heated by the auxiliary heat source unit 17.
On the other hand, when the temperature of the hot water in the upper layer of the heat storage tank 14, that is, the temperature of the hot water measured by the fifth temperature sensor T5 is equal to or higher than the hot water supply set temperature required at the hot water use location 43, in the bypass state. Hot water is supplied, and hot water is supplied to the hot water supply location 43 without unnecessary heating by the auxiliary heat source device 17.
In addition, when the temperature of the hot water led to the hot water use location 43 is higher than the hot water set temperature required at the hot water use location 43, the hot water is mixed from a water supply path (not shown), so that the hot water set temperature is reached. The adjusted hot water will be supplied from the hot water supply use location 43.

(Related to fluid receiving member)
Next, the structure relevant to the fluid receiving member 70 with which the heat storage apparatus 100 of this embodiment is provided is demonstrated based on FIG.1 and FIG.5.

Below the heat storage tank 14, an inverted container shape that forms a stay space 75 inside, specifically, a box-shaped fluid receiving member 70 that opens at the bottom is disposed.
The fluid receiving member 70 is provided so as to cover both the lower heat connection port 61b and the lower heat connection port 61a from above. In other words, the circular cross section inside the heat storage tank 13 in plan view. Is provided in a state of overlapping with both the heat radiation lower connection port 61b and the heating lower connection port 61a, and in the same plan view, the square fluid The receiving member 70 is disposed in such a posture that the lower connection port 61b for heat dissipation and the lower connection port 61a for heating are positioned in the vicinity of the center of each of the pair of side wall portions facing each other. The lower part of the inside of the heat storage tank 14 is the lower side of the center part in the vertical direction of the heat storage tank 14, and preferably refers to a region from the bottom 14a of the heat storage tank 14 to 2 to 20 cm. Shall.

As a result, the fluid receiving member 70 attenuates the upward flow of the radiant return hot water, which is hot water flowing into the heat storage tank 14 from the heat radiating lower connection port 61b, and guides the heat radiant return hot water toward the heating lower connection port 61a. To function.
The fluid receiving member 70 is provided in a state in which the hot water of the heat storage tank 14 can go back and forth in the vertical direction. Specifically, the fluid receiving member 70 is provided in a state in which a gap 64 is provided between the side surface of the heat storage tank 14.
In addition, the size of the fluid receiving member 70 can be appropriately determined depending on the inflow state of hot water from the heat radiating lower connection port 61b to the stay space 75, the amount of hot water to be retained in the stay space 75, and the like. In addition, the height of the fluid receiving member 70, that is, the depth of the staying space 75, can prevent the medium-to-high temperature hot water received in the staying space 75 from leaking outside the staying space 75 as much as possible. it can.

As shown in FIG. 5, a staying space 75 whose lower side is opened to the heat storage tank 14 is formed inside the fluid receiving member 70, and the staying space 75 is a return of heat dissipation flowing from the lower connection port 61 b for heat dissipation. It functions as a space for temporarily retaining hot water. That is, the stay space 75 is connected to the inside of the heat storage tank 14 outside the stay space 75 under the stay space 75, and hot water can flow therethrough.
Moreover, the lower connecting port 61a for heating and the lower connecting port 61b for heat dissipation are formed as the tip openings of the pipes 63a and 63b inserted upward from the bottom 14a of the heat storage tank 14.
Further, the heating lower connection port 61a is disposed at a height position close to the upper surface of the stay space 75, and specifically, air formed near the ceiling portion of the stay space 75 will be described in detail later. It is arranged in such a posture that it opens upward at a position slightly below the layer 74.
As a result, among the radiant return hot water retained in the retention space 75, the one having a higher temperature is sequentially led to the heating forward line R <b> 1.
On the other hand, the heat radiating lower connection port 61 b is disposed at a height position close to the lower end of the side surface of the stay space 75, specifically, slightly above the lower end of the inner surface of the side wall portion of the fluid receiving member 70. It is arrange | positioned with the attitude | position which opens upwards in this position. Note that the heat radiating lower connection port 61b may be arranged in a horizontal direction at a lower position than the lower end of the side surface of the stay space 75.

Air (bubbles) may flow into the stay space 75 from the heat radiation return pipe R4 via the heat radiation lower connection port 61b. Therefore, an air escape hole 70 a is formed below the ceiling portion of the stay space 75 in the side wall portion of the fluid receiving member 70.
Therefore, the air (bubbles) flowing into the staying space 75 can escape to the outside of the staying space 75 in the heat storage tank 14 through the air escape hole 70a.
Furthermore, since the air escape hole 70 a formed in the fluid receiving member 70 is located below the ceiling portion of the stay space 75, it flows into the stay space 75 above the air escape hole 70 a in the stay space 75. An air layer 74 filled with air is formed, and the heat conductivity of the air layer 74 is low, so that the heat retaining property against hot water in the staying space 75 is further enhanced.
The fluid receiving member 70 is preferably made of a heat insulating material in order to further improve the heat retaining property against hot water of medium temperature in the staying space 75. As such a heat insulating material, for example, a polyolefin-based or polyethylene-based foam material can be used in consideration of workability, shape retention, and the like in addition to heat insulating properties.

(Related to hot water circulation state control)
Next, the structure relevant to the control of the hot water circulation state performed in the heat storage apparatus 100 of this embodiment is demonstrated based on FIGS.
The heat storage device 100 is provided with a control device 20 (an example of control means) that controls the circulating flow rate of hot water in the heating circuit C1 and the heat radiation circuit C2.
This control device 20 heats the circulating flow rate of hot water in the heat radiation circuit C2 during heating and heat radiation operation in which hot water is circulated in both the heating circuit C1 and the heat radiation circuit C2 to perform heating and heat radiation at the same time. The temperature stratification maintaining control is executed to maintain the circulating flow rate below the circulating water flow in the circulation circuit C1.
By executing this temperature stratification maintenance control, the medium-to-high-temperature radiant return hot water flowing into the heat storage tank 14 from the heat radiating lower connection port 61b is well guided to the heating lower connection port 61a. It is suppressed that the temperature stratification of the tank 14 is disturbed.
The details of the temperature stratification maintenance control will be described below.

Referring to FIG. 1, control device 20 performs temperature cleaning maintenance control during the heat radiation operation, and the heat return flow rate L2 flowing from heat radiation lower connection port 61b flows out from heat lower connection port 61a. The heating circulation flow rate L1 is maintained below. Thereby, it is possible to prevent the intermediate and high-temperature radiant return hot water from forming an upward flow inside the heat storage tank 14 and maintain the stratified hot water state in the heat storage tank 14.
Here, in order to suppress the disturbance of temperature stratification in the heat storage tank 14 more satisfactorily, the control device 20 uses the heating lower connection port 61a than the heat radiation return flow rate L2 flowing from the heat radiation lower connection port 61b. The heating circulation flow rate L1 that flows out is set smaller by a predetermined margin width (for example, about 0.1 to 0.2 l / min).
Here, if the predetermined margin width is less than 0.1 l / min, the upward flow in the heat storage tank 14 cannot be appropriately suppressed, and if it exceeds 0.2 l / min, the amount of hot water circulating in the heating circuit C1 is increased. On the other hand, the amount of hot water circulating in the heat radiation circuit C2 decreases, and extra hot water storage increases.

  The control device 20 performs the following heating operation, heat dissipation operation, and heating heat dissipation operation in parallel to realize the above-described temperature stratification maintenance control. In addition, performing in parallel here means making all three operations into an execution state, and means performing the heating and heat radiation operation while performing the heating operation and the heat radiation operation.

(Heating operation)
As shown in FIG. 2, control device 20 executes a heating operation start process in response to an external heating operation start command (# 11).
Control device 20 operates heating circulation pump 12 at the minimum flow rate (# 12).
Thereafter, the control device 20 operates the combined heat and power supply device 11 to heat the hot and cold water circulating in the heating circuit C1, and the temperature of the hot water heated by the combined heat and power supply device 11, that is, the first temperature sensor T1. The heating circulation flow rate L1 is adjusted by controlling the rotation speed of the heating circulation pump 12 so that the temperature of the hot water becomes the hot water storage temperature (# 13).
Control device 20 repeatedly executes step # 13 until a heating operation end command is issued (# 14).
On the other hand, when there is an instruction to end the heating operation, control device 20 executes a heating operation end process for stopping heating circulation pump 12 and the like to end the heating operation (# 15).

(Heat dissipation operation)
As shown in FIG. 3, control device 20 executes a heat radiation operation start process in response to an external heat radiation operation start command (# 21). That is, the opening state of the three-way valve 15 is set so that hot water is guided to the first bypass passage R5 and not to the heat storage tank 14, and the on-off valve 19 provided in the heat radiation circuit C2 is opened. .
Control device 20 operates heat radiating circulation pump 16 at a predetermined flow rate (# 22).
Thereafter, the control device 20 controls the burner 17a so that the temperature of the hot water passing through the auxiliary heat source unit 17 (an example of the auxiliary heating unit), that is, the temperature measured by the third temperature sensor T3 becomes the set temperature. Work (# 23).
Control device 20 repeatedly executes step # 23 until there is a command to end the heat radiation operation (# 24).
On the other hand, when there is an instruction to end the heat dissipation operation, the control device 20 executes a heat dissipation operation end process for stopping the heat dissipation circulation pump 16 and the like in order to end the heat dissipation operation (# 25).

(Heating heat dissipation operation)
The control device 20 performs the following heating and heat radiation operation while performing the above heating operation and heat radiation operation.
That is, as shown in FIG. 4, the control device 20 executes the heating / heat radiation operation start process in response to an external heating / heat radiation operation start command (# 31). That is, by setting the switching valve 13 to the water supply-both sides, all three sides are opened.
At this time, the control device 20 sets the opening state of the three-way valve 15 to a state in which hot water is guided to the first bypass passage R5 and is not guided to the heat storage tank 14 side. Moreover, the on-off valve 19 that controls the flow state of the heat radiation circuit C2 is opened.

The control device 20 (heating circulation flow rate estimating means 20a) is based on the number of rotations of the heating circulation pump 12, and the hot water flow rate L1 circulating through the heating circulation circuit C1, that is, the heating guided from the heat storage tank 14 to the heating forward line R1. Circulating flow rate L1 is estimated (# 32).
In addition, the rotation speed of the heating circulation pump 12 can be estimated from the applied voltage and the applied frequency to the heating circulation pump 12.

Furthermore, the control device 20 (heat dissipation return flow rate estimation means 20b) returns the heat dissipation return from the measurement result of the first flow sensor F1 that measures the flow rate of hot water flowing through the auxiliary heat source unit 17 and the opening ratio of the three-way valve 15. A heat radiation return flow rate L2 led from the pipe line R4 to the heat storage tank 14 is estimated (# 33).
That is, the control device 20 determines the flow rate of hot water flowing through the radiant heat exchanger 18 of the radiating circuit C2 from the ratio of the opening degree of the three-way valve 15 on the heat storage tank 14 side and the opening degree on the first bypass path R5 side. Of the (hot water flow rate measured by the first flow rate sensor F1), the heat return flow rate L2 flowing through the heat return channel R4 is estimated.

When the estimated heat dissipation return flow rate L2 is equal to or lower than the heating circulation flow rate L1 and the temperature of the heat dissipation hot water is equal to or lower than the set temperature (the temperature measured by the second temperature sensor T2 is equal to or lower than the set temperature), The three-way valve 15 is slightly opened toward the heat storage tank 14 (# 34, 35).
At this time, since the heat dissipation return flow rate L2 is equal to or less than the heating circulation flow rate L1, even if the three-way valve 15 is slightly opened to the heat storage tank 14 side, the heat dissipation return hot water led to the heat storage tank 14 side remains in the heat storage tank 14. Thus, it is guided to the heating forward line R1 without forming an upward flow. On the other hand, the hot and cold water that has been circulated through the heating circuit C1 is led to the radiating forward pipe R3, and the thermal efficiency is improved.

On the other hand, when the heat dissipation return flow rate L2 is greater than the heating circulation flow rate L1 or the temperature of the heated forward hot water is higher than the set temperature (the temperature measured by the second temperature sensor T2 is higher than the set temperature), the control device 20 The three-way valve 15 is slightly opened toward the first bypass R5 (# 36).
Thereby, the flow rate of the upward flow inside the heat storage tank 14 can be reduced, and the temperature of the hot water circulating in the heat radiation circuit C2 is maintained at the temperature required by the heat radiation heat exchanger 18.

Control device 20 repeatedly executes steps # 32 to # 36 until there is a command to end the heat radiation operation (# 37).
On the other hand, when there is an instruction to end the heat radiation operation, the control device 20 sets the switching valve 13 to the water supply-heat storage tank 14 side and the three-way valve 15 to the first bypass path R5 side to end the heat radiation operation. (# 38).

  As described above, in addition to the control device 20, the heating circulation pump 12, the heat dissipation circulation pump 16, the three-way valve 15, the first temperature sensor T1, the second temperature sensor T2, the third temperature sensor T3, and the first flow rate sensor F1. In addition, it serves as a control means for executing temperature stratification maintenance control during heating and heat dissipation operation.

[Second Embodiment]
A second embodiment of the heat storage device and the cogeneration system according to the present invention will be described with reference to FIG.
In addition, since it is the same as that of the said 1st Embodiment about structures other than the fluid receiving member 70 relation, description is omitted.

(Related to fluid receiving member)
The fluid receiving member 70 shown in FIG. 6 has the same reverse container-shaped outer receiving member 71 disposed on the outer side, and the reverse container-shaped outer container 71 disposed on the inner side with respect to the outer receiving member 71 with the inter-member gap 73 interposed therebetween. And an inner receiving member 72. The inner receiving member 71 is disposed inside the fluid receiving member 70 and functions as a partition wall that partitions the inter-member gap 73 facing the side wall portion of the fluid receiving member 70 and the staying space 75.
That is, the fluid receiving member 70 is formed by superposing a box-shaped outer receiving member 71 having an open bottom surface and a box-shaped inner receiving member 72 slightly smaller than the box-shaped outer receiving member 72 with an inter-member gap 73 therebetween. Has a heavy structure. Therefore, since the hot water stored in the heat storage tank 14 does not flow in at least a part of the inter-member gap 73, heat exchange between the inner receiving member 72 and the outer receiving member 71 is performed. However, it is in a state of being suppressed by the presence of the non-flowing hot water, and the heat retaining property of the medium-high temperature hot water existing in the stay space 75 formed inside the fluid receiving member 70 is enhanced.
In addition, in the simulation result when it is assumed that the inter-member gap 73 is filled with hot water, an improvement in heat loss of about 5% was confirmed.

A staying space 75 whose lower side is opened to the heat storage tank 14 is formed inside the fluid receiving member 70, and the staying space 75 is similar to the above-described embodiment in that the heat dissipation return flowing in from the lower connection port 61b for heat dissipation. It functions as a space for temporarily retaining hot water.
In addition, an air escape hole 71a similar to the air escape hole 70a (see FIG. 5) of the first embodiment is formed in the side wall portion of the outer reception member 71. An air receiving hole 72 a is formed above the air escape hole 71 a, specifically, near the center of the upper wall portion of the inner receiving member 72.
Therefore, the air (bubbles) flowing into the stay space 75 can escape to the outside of the stay space 75 in the heat storage tank 14 through the inner air escape hole 72a and the air escape hole 71a.
Furthermore, since the air release hole 71a formed in the outer receiving member 71 is disposed below the air receiving hole 72a formed in the inner reception member 72, the air gap hole 73a has a larger gap than the air release hole 71a. On the upper side, an air layer 74 filled with the air flowing in from the air receiving hole 72a is formed, and since the heat conductivity of the air layer 74 is low, heat retention for hot water of medium and high temperature in the stay space 75 is maintained. The nature is further enhanced.

Furthermore, since the upper end position of the air escape hole 71a is located at substantially the same height as the upper surface of the staying space 75, the air flowing into the staying space 75 does not stay on the upper surface, and the air receiving hole 72a. Then, the air flows into the inter-member gap 73.
Therefore, air does not stay in the ceiling portion of the stay space 75 formed inside the inner receiving member 72, and the air flows into the heating circuit C1 via the heating lower connection port 61a. It is further suppressed.

[Another embodiment]
Finally, other embodiments of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.

(1) In the second embodiment, in the fluid receiving member 70, the upper end position of the air escape hole 71a is arranged at substantially the same height as the upper surface of the staying space 75. However, as shown in FIG. Although the air layer 74 is also formed on the upper surface, the upper end position of the air escape hole 71 a may be disposed below the upper surface of the staying space 75.
In this case, the air receiving hole 72a may be formed in the vicinity of the center of the upper wall portion of the inner receiving member 72 as in the above embodiment. For example, the air receiving hole 72a is formed in the inner receiving member 72. It can also be formed on the upper end side of the side wall.

(2) In the second embodiment, in the fluid receiving portion 70, the fluid receiving member 70 includes the outer receiving member 71 and the inner receiving member 72, and the inner receiving member 70 has the inter-member gap 73 and the staying space 75. However, as shown in FIG. 8, a fluid receiving member 70 provided with another form of partition wall 76 may be employed.
Specifically, the fluid receiving member 70 has a single structure as in the first embodiment, and a gap 73 and a staying space facing the side wall of the fluid receiving member 70 are provided inside the fluid receiving member 70. A partition wall 76 for partitioning 75 is disposed, and an air receiving hole 76a is formed in the partition wall 76 above the air escape hole 70a.
The partition wall 76 is a plate-like member that has a posture in which the side wall portion is translated inward by the width of the inter-member gap 73 with respect to each of the pair of opposite side wall portions of the fluid receiving member 70. The side edge portion and the upper edge portion of the partition wall 76 are bonded and fixed to the inner wall of the fluid receiving member 70.
The air receiving hole 76a is formed in the vicinity of the center above the partition wall 76, and a member tube gap 73 is formed between the partition wall 76 and the side wall of the fluid receiving member 70. In the pair of side walls to be formed, an air escape hole 70a is formed below the air receiving hole 76a.

In the configuration of the fluid receiving member 70 as well, the hot water stored in the heat storage tank 14 does not flow in at least a part of the inter-member gap 73 as in the second embodiment. As a result, heat exchange between the partition wall 76 and the pair of side walls of the fluid receiving member 70 is suppressed by the presence of the non-flowing hot water, and the heat receiving member 70 is placed inside the fluid receiving member 70. The heat retaining properties of the medium-high temperature hot water present in the formed stay space 75 are enhanced.
Further, the air (bubbles) flowing into the staying space 75 passes through the air escape holes 76 a formed in the partition wall 76 and the air escape holes 70 a formed in the fluid receiving member 70, and the staying space in the heat storage tank 14. 75 can escape to the outside.
Further, an air layer 74 is formed above the air escape hole 71a of the stay space 75 and the inter-member gap 73, and this air layer 74 further enhances the heat retaining property for the medium and high temperature hot water in the stay space 75. Yes.

(3) In the above-described embodiment, the heat / electric power supply device 11 is described as an example of the heating unit. The cogeneration apparatus 11 includes any device that generates heat together with electric power, such as a gas engine generator or a fuel cell.
Further, the heating unit is not limited to the combined heat and power supply device 11, and a heat pump, a solar heat recovery panel, or the like can also be employed.

(4) In the above embodiment, the inflow side of the heat radiation circulation circuit R2 of the heat radiation circulation circuit C2 is directly connected to the upper layer of the heat storage tank 14, but the heat radiation circulation circuit R2 of the heat radiation circulation circuit C2 is The heat return line R2 may be connected to the outflow side.
According to this configuration, the heating circulation flow L1 circulating in the heating circulation circuit C1 and the hot water flow L2 circulating in the heat radiation circulation circuit C2 are made equal, and hot water heated in the heating section of the heating circulation circuit C1 is stored as heat. A hot water circulation state that circulates directly to the heat radiation circuit C2 can be realized without storing the hot water in the tank 14.
In such a hot and cold water circulation state, when a heat pump is employed as the heating unit, the heat pump can be operated in a state that matches the load of the heat radiating terminal 30 such as a floor heating device (for example, the feed temperature of the heat medium: 40 ° C.). In this case, since it is not necessary to raise the temperature of the hot water heated by the heat pump to the target hot water temperature (60 to 75 ° C.) stored in the heat storage tank 14, operation is performed at a higher COP than in the case of raising the temperature. be able to.

(5) In the above embodiment, the heating circulation flow rate L1 is estimated by the control device 20 (heating circulation flow rate estimation means 20a) based on the applied voltage and applied frequency to the heating circulation pump 12, but directly to the heating circulation circuit C1. You may comprise so that a flow sensor may be provided and measured.

(6) In the above embodiment, the heat dissipation return flow rate L2 is the result of measurement by the first flow sensor F1 in which the control device 20 (heat dissipation return flow rate estimation means 20b) measures the flow rate of hot water flowing through the auxiliary heat source unit 17. Although estimated based on the opening ratio of the three-way valve 15, a flow rate sensor may be provided directly in the heat dissipation return line R4 for measurement.

(7) In the above embodiment, a single control device 20 is in the form of centralized control that performs heating operation, heat radiation operation, and heat radiation operation, but each operation is provided with a function of communicating each other's operation status. It may be in the form of distributed control with individual control devices.

(8) In the said embodiment, the heat-medium circulation circuit C3 arrange | positioned between the terminal 30 for thermal radiation, such as a floor heating apparatus and a bathroom heating apparatus, and the thermal radiation heat exchanger 18 is mentioned as an example of a structure of a thermal radiation part. However, it is also possible to employ a bath circulation circuit or the like.

  The present invention stores a heat storage fluid, and has an upper connection port at an upper portion and a lower storage port at a lower portion, and the upper connection port after the heat storage fluid taken out from the lower connection port is heated by a heating unit. The heat circulation circuit that heats the heat storage fluid in the form of returning to the heat connection, and the heat storage fluid taken out from the upper connection port after radiating the heat storage fluid in the heat radiating part, and then returning to the lower connection port, the heat storage fluid is dissipated. The present invention can be suitably used as a heat storage device including a heat radiation circuit to be performed and a cogeneration system including the heat storage device.

11: Combined heat and power supply (heating unit)
14: Heat storage tank 18: Heat radiation heat exchanger (heat radiation part)
20: Control device (control means)
30: Heat radiation terminal 61: Lower connection port 61a: Heating lower connection port 61b: Heat radiation lower connection port 62: Upper connection port 63a: Pipe 63b: Pipe 64: Gap 70: Fluid receiving member 70a: Air escape hole 71: Outer receiving member 71a: Air escape hole 72: Inner receiving member 72a: Air receiving hole 73: Inter-member clearance 74: Air layer 75: Residence space 76: Partition wall 76a: Air receiving hole 100: Heat storage device C1: Heating circulation circuit C2 : Heat dissipation circuit

Claims (8)

A heat storage tank for storing a heat storage fluid, having an upper connection port at the top and a lower connection port at the bottom;
A heating circuit that heats the heat storage fluid in a form that returns the heat storage fluid taken out from the lower connection port to the upper connection port after being heated by a heating unit,
In the form of returning the heat storage fluid taken out from the upper connection port to the lower connection port after radiating heat at the heat radiating section, a heat storage device comprising a heat dissipation circuit that radiates heat of the heat storage fluid,
An inverted container-shaped fluid receiving member that is disposed below the heat storage tank and forms a stay space inside;
As the lower connection port,
A lower connection port for heating, which is connected to an inflow side of the heating unit in the heating circulation circuit and is arranged to take out the heat storage fluid from the staying space to the heating unit;
A heat radiation lower connection port arranged to return the heat storage fluid from the heat radiation part to the staying space connected to the outflow side of the heat radiation part in the heat radiation circuit, respectively,
The fluid receiving member includes a cylindrical or rectangular tube-shaped side wall portion extending along the vertical direction and a ceiling portion covering a cylindrical upper end portion of the side wall portion, and the side wall portion of the fluid receiving member. bottom corresponding to the cylindrical lower end portion of the opening, the lower side of the ceiling portion of the retaining space in the side wall portion of the fluid receiving member, escape air communicating said retaining space to the outside of the fluid receiving member A heat storage device in which holes are formed. Inside the fluid receiving member, a partition wall that partitions the gap facing the side wall portion of the fluid receiving member and the staying space is disposed,
The heat storage device according to claim 1, wherein an air receiving hole is formed in the partition wall at an upper side than the air escape hole. The fluid receiving member is composed of a reverse container-shaped outer receiving member disposed on the outside and a reverse container-shaped inner receiving member disposed on the inner side with a gap with respect to the outer receiving member,
The heat storage device according to claim 2, wherein the inner receiving member functions as the partition wall.   The heat storage device according to claim 3, wherein the air receiving hole is formed in an upper wall portion of the inner receiving member.   The heat storage device according to any one of claims 1 to 4, wherein the heat radiation lower connection port is disposed below the heating lower connection port. The heating lower connection port and the heat radiation lower connection port are formed as a tip opening of a pipe inserted upward from the bottom of the heat storage tank,
The heating lower connection port is disposed at a height position close to the ceiling portion of the staying space,
The heat storage device according to claim 5, wherein the heat radiation lower connection port is disposed at a height position close to a lower end of a side surface of the stay space. Control means for controlling the circulation flow rate of the heat storage fluid in the heating circulation circuit and the heat dissipation circulation circuit;
In the heating and radiating operation in which the control means circulates the heat storage fluid in both the heating circulation circuit and the heat dissipation circulation circuit to simultaneously heat and release the heat storage fluid, the circulation flow rate of the heat storage fluid in the heat dissipation circulation circuit The thermal storage device according to any one of claims 1 to 6, wherein temperature stratification maintenance control is performed to maintain the temperature below the circulating flow rate of the thermal storage fluid in the heating circuit. A cogeneration device that generates heat and electricity, and a heat storage device that stores heat of the cogeneration device,
The heat storage device is configured as the heat storage device according to any one of claims 1 to 7, and hot water as the heat storage fluid heated by the heat and power supply device as the heating unit is used as the heat storage tank. Cogeneration system stored in

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