JP4043437B2 - Distributed hot water storage system for hot water storage tank and distributed hot water storage unit used therefor - Google Patents

Description

  The present invention relates to a hot water supply system in which hot water is distributed to hot water supply places in a household and hot water supply to hot water facilities in each room of a hotel or the like from a concentrated heat source in an economical and convenient manner and a hot water supply system in which the hot water is distributed. The present invention relates to a distributed hot water storage unit.

Conventionally, a hot water supply method using a return pipe has been widely used in business applications such as hotels in order to supply hot water without a waiting time to a hot water supply demand end dispersed from a concentrated heat source. However, for home use, the return pipe is rarely used because it has a large heat dissipation loss from the pipe and is not economical.
Instead, for home use, a small hot water storage tank with a heat source is installed under the bathroom vanity or sink, and the hot water waiting time is eliminated by connecting a short distance to the hot water tap with a hot water supply pipe. Some have been tried. The following documents relate to those conventional examples.

A. First Conventional Example A hot water supply apparatus is configured so that hot water heated by a hot water heater is temporarily stored in a hot water storage tank, and then heated or heated using a heat pipe, and then discharged from a hot water tap through a temperature control valve (patent) Reference 1).

B. Second Conventional Example A hot water supply apparatus is configured by connecting a faucet to a hot water storage tank heated by a gas or an electric heat source via a hot water discharge pipe. The hot water storage tank and the hot water discharge pipe are connected via the bypass pipe. Based on the specific gravity difference between the hot water discharge pipe and the bypass pipe, the hot water in the bypass pipe is returned to the hot water storage tank, and the hot water temperature in the hot water discharge pipe is increased. It is comprised so that it may keep near the preset temperature in a hot water storage tank (refer patent document 2).
Japanese Utility Model Publication No. 64-1350 JP-A-11-190557

  However, in the above-described first and second conventional examples, although the hot water property can be ensured, the hot water storage tank (hot water storage tank) has a separate heat source, so that the running cost of the electric heat source is high, the gas heat source However, there were problems in initial cost and workability for installing exhaust pipes and gas pipes.

As another conventional example, there is a return pipe hot water supply system including a heat source machine and a concentrated hot water storage tank as shown in the overall schematic configuration diagram of FIG.
In this conventional example, a heat source 01 and a hot water storage tank 02 are connected via a return pipe 04 and a hot water supply pipe 05 provided with a first circulation pump 03, and hot water heated by the heat source 01 is supplied to the hot water storage tank 02. It is configured to supply and store.

A hot water supply pipe 06 is connected to the hot water storage tank 02, and short branch pipes 07a, 08a, 09a provided with three hot water taps 07, 08, 09 as hot water supply demand ends are connected in series to the hot water supply pipe 06. ing. The end of the hot water supply piping 06 and the hot water storage tank 02 are connected via a hot water supply return piping 013 provided with a check valve 010, a constant flow valve 011 and a second circulation pump 012.
With the above configuration, even when there is no hot water supply, hot water is always supplied from the hot water supply pipe 06 to the hot water return pipe 013 so that the hot water in the hot water supply pipe 06 is kept at an appropriate temperature, and hot water can be immediately supplied from the hot water taps 07, 08, 09. It has become.

However, in the hot water supply piping 06, it is necessary to construct a pipe having a diameter considering the possibility of simultaneous discharge from the three hot water taps 07, 08, 09, and the hot water in the hot water supply piping 06 is heated to a high temperature. Therefore, it is necessary to constantly circulate a relatively large flow rate of hot water in order to maintain the flow rate. For this reason, there has been a problem in that the heat dissipation loss from the hot water supply piping 06 and the hot water return piping 013 becomes large, and the pump power for circulation becomes an amount that cannot be ignored. Furthermore, it is necessary to install a large-capacity concentrated hot water storage tank, and there remains a problem in installability.
On the other hand, when installing hot water storage tanks with heat sources for each of the hot water taps 07, 08, 09, the equipment costs, fuel piping costs, and exhaust pipe construction costs for installing the heat sources in each hot water tank are expensive. Alternatively, there is a problem in that, if these are used as an electric heat source in order to make them cheaper, the electricity charge becomes high.

  This invention is made in view of said point, Comprising: The invention which concerns on Claim 1 makes it possible to aim at energy saving while providing the hot-water supply system which is excellent in instant hot water property cheaply. The purpose of the invention according to claim 2 is to enable further energy saving without impairing the hot water property, and the invention according to claim 3 suppresses heat radiation from the hot water return pipe. In order to save energy, the invention according to claim 4 is able to satisfactorily fill hot water in a hot water storage tank while avoiding a decrease in hot water supply temperature. Therefore, the invention according to claim 5 is capable of avoiding a decrease in the hot water temperature and providing a good hot water supply regardless of the pressure change in the hot water supply piping accompanying the hot water coming from the hot water supply demand end. The invention according to claim 6 aims to make the configuration for mixed water supply inexpensive, and the invention according to claim 7 is a hot water tank distributed installation type according to the invention according to claim 2. The purpose of the invention is to make it possible to easily construct a hot water supply system, and the invention according to claim 8 is to make it possible to easily construct the hot water tank distributed installation type hot water supply system of the invention according to claim 3, The invention according to claim 9 is to make it possible to easily construct the hot water tank distributed installation type hot water supply system of the invention according to claim 4.

In order to achieve the above-described object, the hot water tank distributed installation type hot water supply system of the invention according to claim 1
A hot water supply pipe connected to a heat source is connected to a hot water storage tank and a plurality of hot water supply demand ends that are intermittently used and distributed, and hot water output from the heat source is supplied to the hot water storage tank. A hot water supply system configured to store hot water stored in the hot water storage tank so as to be supplied to the hot water supply demand end,
The hot water storage tank is connected to the hot water supply outlet pipe at a position immediately upstream of each of the hot water supply demand ends, a hot water return pipe for circulation during hot water storage is connected to the hot water storage tank, and a hot water supply pipe is connected to the hot water return pipe. By connecting and applying pressure from the lower part of the hot water storage tank at the time of hot water supply, the hot water supply demand end can be configured to supply hot water.
Here, the hot water demand end is a hot water tap provided in a bathroom, a bathroom vanity, a kitchen, etc., for example, when a plurality of hot water taps are provided close to each other such as for a bathtub and for a shower. Is called a single hot water demand end with a plurality of hot water taps.

(Action / Effect)
According to the structure of the hot water storage tank distributed installation type hot water supply system of the invention according to claim 1, at the time of hot water supply, the hot water storage tank at the position immediately upstream of the hot water supply demand end is provided by applying the water supply pressure from the water supply pipe as the pressure for hot water supply. Hot water can be supplied from.
Therefore, the hot water stored in the hot water storage tank immediately upstream of the hot water supply demand end can be supplied without a hot water waiting time without providing a hot water storage tank equipped with a heat source, and so-called instant hot water properties are excellent.
Moreover, even when hot water supply demand occurs at multiple hot water supply demand ends, it can be covered by hot water supply from a hot water storage tank immediately upstream from the hot water supply demand end, and it is not necessary to provide a large-capacity heat source, and a large concentration There is no need to install a hot water tank, and system construction costs can be reduced as much as possible.
In addition, since the diameter of the hot water supply piping can be reduced to a small diameter without allowing for the simultaneous use of multiple hot water supply demand ends, the cost required for piping materials can be reduced and the heat radiation from the hot water supply piping is reduced. Can save energy. That is, since the heat radiation from the pipe is proportional to the surface area of the pipe, for example, if the diameter can be halved, the heat radiation amount can be halved and energy saving can be achieved.
Furthermore, when hot water is stored in the hot water storage tank from the heat source, room temperature water in the lower part of the hot water tank flows through the hot water supply return pipe, and high temperature hot water does not flow in the hot water return pipe, so there is almost no heat dissipation from the hot water return pipe. Energy saving.
In addition, since hot water is supplied from the end of hot water supply using the water supply pressure from the water supply pipe, it is not necessary to add a pumping device such as a pump for hot water supply or to increase the capacity, thereby reducing costs and failure. be able to.

In order to achieve the above-described object, the invention according to claim 2
The hot water storage tank distributed installation type hot water supply system according to claim 1,
The hot water supply return pipe is configured to include a flow control mechanism that restricts the flow rate from the hot water storage tank to the hot water supply return pipe and does not limit the flow from the water supply pipe to the hot water storage tank.

(Action / Effect)
According to the configuration of the hot water tank distributed installation type hot water supply system of the invention according to claim 2, by restricting the flow rate to the water supply pipe side during hot water storage from the heat source to the hot water storage tank, Hot water can be supplied so that it can be filled simultaneously in a state corresponding to the capacity, while when hot water is supplied from the end of hot water supply, pressure for hot water supply from the water supply pipe can be quickly applied without limitation. .
Therefore, when hot water is supplied from the end of hot water supply, water is passed through at a low pressure loss to quickly apply pressure for hot water supply. In addition to preventing the tank from being generated, it is possible to suppress high-temperature hot water flowing from the hot water storage tank to the hot water supply return pipe and dissipate heat unnecessarily, and further energy saving can be achieved without impairing the hot water property.

In order to achieve the above-described object, the invention according to claim 3
The hot water storage tank distributed installation type hot water supply system according to claim 1,
Hot water amount detecting means for detecting the amount of hot water stored in the hot water tank;
Flow rate control means for controlling the flow rate of hot water flowing into the hot water storage tank;
A flow rate reduction control mechanism that suppresses the flow rate of hot water flowing into the hot water storage tank to a set flow rate that is smaller than that during normal hot water storage when the hot water amount detection means detects storage of a hot water amount of a predetermined amount or more. To do.
The set flow rate may be reduced to zero for a short time. However, in order to maintain the hot water temperature in the hot water outgoing pipe, it is desirable to keep a minute flow rate sufficient to compensate for heat dissipation loss.

(Action / Effect)
According to the configuration of the hot water tank distributed installation type hot water supply system of the invention according to claim 3, when hot water is filled in the hot water tank, this is detected by the hot water amount detecting means, and the hot water flow rate to the hot water tank Can be reduced.
Therefore, after the hot water tank is filled with hot water, the hot water supply to the hot water tank already filled with hot water can be suppressed, and the reduced amount of hot water can be directed to the hot water tank not yet filled with hot water. Therefore, hot water can be stored efficiently, and at the same time, the flow rate of hot water flowing through the hot water return pipe is reduced, so that heat radiation from the hot water return pipe can be suppressed and energy saving can be achieved.

In order to achieve the above-described object, the invention according to claim 4
The hot water storage tank distributed installation type hot water supply system according to claim 1,
Hot water detection means attached to each hot water supply demand end for detecting hot water from the hot water supply demand end;
A shut-off mechanism attached to each hot water storage tank to block outflow of water from the hot water storage tank to the hot water supply demand end;
No hot water detection means for detecting that the hot water stored in the hot water tank attached to each hot water tank is gone,
When any hot water detection means detects hot water, the hot water is sent from the hot water tank by opening the shut-off mechanism in the vicinity or immediately including the upstream, and while the shut-off mechanism is open, When the hot water detecting means detects that no hot water is in the hot water storage tank, the hot water storage tank is configured to include a hot water tank control mechanism that operates a shut-off mechanism of the hot water tank.
Here, the hot water tank control mechanism includes a communication device that exchanges data between the detection means and the shut-off mechanism.

(Action / Effect)
According to the configuration of the hot water storage tank distributed installation type hot water supply system according to the fourth aspect of the invention, the shut-off mechanism is opened or opened while hot water is present in the hot water storage tank as hot water is detected at the hot water supply demand end. The hot water can be discharged from the hot water supply demand end while maintaining the state.
If hot water is no longer stored in any of the hot water storage tanks, the shut-off mechanism is actuated, and normal temperature water supply that has passed through the hot water storage tanks can be mixed into the hot water supply piping, and the hot water supply temperature can be prevented from decreasing.
In addition, when none of the hot water detection means detects hot water, the shut-off mechanism is opened, hot water is allowed to flow into the hot water storage tank, and hot water is stored.
Therefore, while hot water can be satisfactorily filled in the hot water storage tank, after the stored hot water is exhausted, normal temperature water is prevented from mixing into the hot water supply piping due to the supply of hot water pressure, and the hot water temperature is reduced. It is possible to maintain a predetermined temperature and to supply hot water well.

In order to achieve the above-described object, the invention according to claim 5
In the hot water storage tank distributed installation type hot water supply system according to any one of claims 1, 2, 3, and 4,
In the hot water supply return pipe, a constant flow mechanism that makes the flow rate constant or a pressure regulation mechanism that makes the differential pressure between the inlet and outlet of the heat source constant between the connection point of the water supply pipe and the heat source To do.

(Action / Effect)
According to the structure of the hot water storage tank distributed installation type hot water supply system of the invention according to claim 5, even when there is hot water from the hot water supply demand end and the pressure in the hot water supply piping is lower than the water supply pipe, the constant flow mechanism The flow rate can be maintained at a constant value, or the pressure difference between the inlet and outlet of the heat source can be made constant by a pressure regulating mechanism. Thereby, irrespective of the presence or absence of hot water, the hot water supply circulation temperature can be maintained constant, and the stable hot water supply temperature can be maintained.
Therefore, regardless of the presence or absence of hot water from the hot water supply demand end, it is possible to avoid fluctuations in the temperature of the hot water output from the heat source due to an increase in the flow rate of the water flowing through the heat source due to a pressure drop in the hot water supply piping. The hot water supply temperature can be kept constant and hot water can be supplied satisfactorily.

In order to achieve the above object, the invention according to claim 6 provides:
In the hot water storage tank distributed installation type hot water supply system according to any one of claims 1, 2, 3, 4, and 5,
A mixed water supply pipe is connected across the hot water supply return pipe and the hot water supply demand end.

(Action / Effect)
According to the configuration of the hot water tank distributed installation type hot water supply system of the invention according to claim 6, mixed hot water supply is used at the time of hot water supply using a configuration in which the pressure for hot water supply by the water supply pressure from the water supply pipe is applied through the hot water supply return pipe. Water can be supplied to the hot water demand end through a pipe.
Therefore, since the hot water supply return pipe can be used for mixed water supply, the structure of the water supply pipe system for adjusting the hot water supply temperature can be simplified, and the structure for mixed water supply can be made inexpensive.

In order to achieve the above object, the invention according to claim 7 provides:
A distributed installation type hot water storage tank unit used in the hot water storage tank distributed installation type hot water supply system according to claim 2,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, a water supply connection port connected to the hot water return pipe is provided on the other end side, and flows between the hot water supply connection port and the water supply connection port. A control mechanism is attached and configured.

(Action / Effect)
According to the configuration of the distributed installation type hot water storage tank unit of the invention according to claim 7, the hot water supply connection port is connected to the hot water supply outgoing pipe, and the water supply connection port is connected to the hot water supply return pipe. It is possible to construct a hot water storage system in which hot water storage tanks are distributed.
Therefore, the hot water tank distributed installation type hot water supply system of the invention according to claim 2 can be easily constructed.

In order to achieve the above object, the invention according to claim 8 provides:
A distributed hot water storage tank unit used in the hot water storage tank distributed hot water supply system according to claim 3,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, a water supply connection port connected to the hot water return pipe is provided on the other end side, and hot water is provided between the hot water supply connection port and the water supply connection port. An amount detection unit, a flow rate control unit, and a flow rate reduction control mechanism are provided.

(Action / Effect)
According to the configuration of the dispersion-installed hot water storage tank unit of the invention according to claim 8, the hot water connection port is connected to the hot water supply piping, and the water supply connection port is connected to the hot water return piping. It is possible to construct a hot water storage system in which hot water storage tanks are distributed.
Therefore, the hot water tank distributed installation type hot water supply system of the invention according to claim 3 can be easily constructed.

In order to achieve the above object, the invention according to claim 9 provides:
A distributed hot water storage tank unit used in the hot water storage tank distributed hot water supply system according to claim 4,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, and a water supply connection port connected to the hot water return pipe is provided on the other end side, and is cut off between the hot water supply connection port and the water supply connection port. A mechanism, no hot water detection means, and a signal from the hot water detection means, and when the hot water detection means detects hot water, the hot water is sent out from the hot water storage tank by opening the shut-off mechanism; and When the shut-off mechanism is opened, when the hot water detecting means detects that no hot water is in the hot water storage tank, a hot water storage tank control mechanism for operating the shut-off mechanism is provided.

(Action / Effect)
According to the configuration of the dispersion-installed hot water storage tank unit of the invention according to claim 9, the hot water connection port is connected to the hot water supply piping, and the water supply connection port is connected to the hot water return piping. It is possible to construct a hot water storage system in which hot water storage tanks are distributed.
Therefore, the hot water tank distributed installation type hot water supply system of the invention according to claim 4 can be easily constructed.

According to the structure of the hot water storage tank distributed installation type hot water supply system of the invention according to claim 1, at the time of hot water supply, the hot water storage tank at the position immediately upstream of the hot water supply demand end is provided by applying the water supply pressure from the water supply pipe as the pressure for hot water supply. Hot water can be supplied from.
Therefore, the hot water stored in the hot water storage tank immediately upstream of the hot water supply demand end can be supplied without a hot water waiting time without providing a hot water storage tank equipped with a heat source, and so-called instant hot water properties are excellent.
Moreover, even if hot water supply demand occurs at multiple hot water supply demand ends, it can be covered by hot water supply from a hot water storage tank immediately upstream of the hot water supply demand end, and it is not necessary to provide a large-capacity heat source, and a large concentration There is no need to install a hot water tank, and system construction costs can be reduced as much as possible.
In addition, the diameter of the hot water supply piping can be reduced to a small diameter without considering the simultaneous use of multiple hot water supply demand ends, so the cost required for piping materials can be reduced and heat dissipation from the hot water supply piping is reduced. Can save energy. That is, since the heat radiation from the pipe is proportional to the surface area of the pipe, for example, if the diameter can be halved, the heat radiation amount can be halved and energy saving can be achieved.
Furthermore, when hot water is stored in the hot water storage tank from the heat source, room temperature water in the lower part of the hot water tank flows through the hot water supply return pipe, and high temperature hot water does not flow in the hot water return pipe, so there is almost no heat dissipation from the hot water return pipe. Energy saving.
In addition, since hot water is supplied from the end of the hot water supply using the water supply pressure from the water supply pipe, it is not necessary to add a pumping device such as a pump for hot water supply or to increase the capacity, thereby reducing costs and failure. be able to.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall schematic configuration diagram showing Example 1 of a hot water storage tank distributed installation type hot water supply system according to the present invention in a hot water storage state, FIG. 2 is an overall schematic configuration diagram showing a hot water supply state, and FIG. A hot-water supply pipe 2 is connected to the hot-water supply pipe 2, and a plurality of hot-water taps 3 serving as hot-water supply demand ends, which are used intermittently and provided in a distributed manner, are connected via the branch pipe 4. .

  Hot water taps 3... At the upstream positions of the hot water supply pipes 2, the upper part of the hot water storage tank 5 is connected to the hot water supply pipe 2 through the high temperature side connection pipe 6, and the hot water supply return pipe 7 for circulating hot water is provided at the lower part of the hot water storage tank 5. It is connected via a low temperature side connection pipe 8.

A hot water supply return pipe 7 is connected to a water supply pipe 9 connected to the heat source 1. The 1st thermometer 10 which measures the temperature of the hot water which comes out of the heat source 1 is provided in the exit location from the heat source 1 of the hot water supply going-out pipe 2. In the water supply pipe 9, a pressure regulating valve 11 as a constant flow rate mechanism for making the flow rate constant and a pump 12 capable of controlling the number of revolutions are provided between a connection point of the hot water supply return pipe 7 and the heat source 1.
The first thermometer 10 and the pump 12 are connected via a controller (not shown), and the temperature measured by the first thermometer 10 becomes a set temperature (set at about 60 to 90 ° C.). Thus, the rotational speed of the pump is controlled, and hot water at a set temperature is supplied in parallel to all the hot water storage tanks 5 while being stored in a state where heat is stored by temperature stratification.

The low temperature side connecting pipe 8 is provided with a first check valve 13 that allows only the flow toward the hot water tank 5, and the first constant flow valve so as to be in parallel with the first check valve 13. 14 is provided to restrict the flow rate from the hot water storage tank 5 to the hot water supply pipe 9 side, and flow so as not to limit the flow from the hot water supply pipe 9 to the hot water storage tank 5 side. A control mechanism 16 is configured.
The three first constant flow valves 14 are set so that their total set flow rate becomes equal to the discharge flow rate in the steady state of the pump 12. Since the flow rate of the pump 12 varies depending on the rotational speed control, it is desirable to provide a bypass flow path by a bypass pipe so as to absorb the excess flow rate.

  With the above configuration, when hot water is stored, as shown in FIG. 1, the first check valve 14 flows through the first constant flow valve 14 and stores in a state where heat is stored by temperature stratification. The supply water pressure from the water supply pipe 9 is applied through the valve 13 with less resistance as the pressure for hot water supply, so that hot water can be immediately supplied from the hot water storage tank 5 closest to the hot water tap 3 where hot water has come out, that is, excellent in hot water characteristics. It has become. At this time, hot water can be supplied to the hot-water tap 3 not only from the closest hot water storage tank 5 but also from the heat source 1 and other hot water storage tanks 5 from three directions. Therefore, the pipe diameter of the hot water supply pipe 2 can be reduced, the cost can be reduced, and the heat radiation can be reduced by reducing the surface area, thereby saving energy. In addition, when the hot water in the hot water storage tank 5 immediately upstream runs out, the water from the hot water storage tank 5 is mixed into the hot water supply piping 2, but hot water from the heat source 1 and other hot water storage tanks 5 can be supplied. The temperature drop of the hot water supplied to the stopper 3 can be suppressed and hot water close to the minimum necessary temperature (for example, 45 ° C.) can be secured.

In addition, after the hot water tank 5 is filled with warm water, the heating by the heat source 1 is temporarily stopped or the heating capacity is reduced as the temperature of the water returning from the hot water supply return pipe 7 to the heat source 1 increases. In addition, energy saving can be achieved.
Further, after that, the rotation speed of the pump 12 is decreased, and a small amount of hot water is circulated to prevent a decrease in hot water temperature due to heat dissipation in the hot water supply going-out pipe 2 and the hot water supply return pipe 7, while saving energy. It is designed to have excellent hot water properties.

  In the figure, reference numeral 17 denotes a mixed water supply pipe used when the hot water tap 3 is a hot and cold water mixing tap. The mixed water supply pipe 17 is connected across the hot water supply return pipe 7 and the hot water tap 3, and the hot water supply return pipe 7 is connected. Utilizing this, the hot water tap 3 can be supplied with water for temperature adjustment.

  FIG. 3 is an overall schematic configuration diagram showing a second embodiment of the hot water tank distributed installation type hot water supply system of the present invention in a state of hot water storage, and the differences from the first embodiment are as follows.

  That is, in addition to the first check valve 13 and the first bypass pipe 15 having the first constant flow valve 14 interposed in the low temperature side connection pipe 8, the first check valve 13 and the first check valve 13. The second bypass pipe 22 having the first on-off valve 21 is connected so as to be in parallel with each of the constant flow valves 14 and the setting is made to flow through the low temperature side connection pipe 8 when storing hot water for heat storage. First temperature detection means (for example, thermistor, thermocouple, bimetal, etc.) 23 is provided as hot water amount detection means for detecting the temperature of hot water and detecting the amount of hot water stored in the hot water tank 5.

  The first on-off valve 21 and the first temperature detecting means 23 are connected to a controller (not shown), and when the first temperature detecting means 23 does not detect hot water at a set temperature during hot water storage, the first on-off valve 21 is opened, the first on-off valve 21 is closed when the first temperature detecting means 23 detects the hot water at the set temperature, the amount of hot water flowing into the hot water tank 5 is increased during hot water storage, and hot water is stored in the hot water tank 5. The flow rate reduction control mechanism 24 is configured to reduce the amount of hot water as it is filled and increase the amount of hot water supplied to other hot water tanks 5 so that hot water can be quickly stored in all the hot water tanks 5. Other configurations are the same as those of the first embodiment, and the description thereof is omitted by assigning the same reference numerals. The first check valve 13, the first constant flow valve 14, and the first on-off valve 21 are configured and referred to as flow control means.

  FIG. 4 is an overall schematic configuration diagram showing a third embodiment of the hot water tank distributed installation type hot water supply system of the present invention in a hot water storage state, and FIG. 5 is an overall schematic configuration shown in a state where the hot water is discharged from the nearest hot water storage tank. FIG. 6 and FIG. 6 are overall schematic configuration diagrams showing a state in which the closest hot water storage tank is empty and the hot water is discharged from another hot water storage tank. The differences from the first embodiment are as follows.

  That is, each branch pipe 4 is provided with a flow switch 31 as hot water detection means for detecting hot water from the hot water tap 3. As the hot water detection means, various configurations such as a configuration in which a hot water tap 3 is detected to be opened using a pressure switch or a flow rate sensor can be employed.

Further, no hot water detecting means (for example, a thermistor, for detecting that the hot water stored in the hot water storage tank 5 has disappeared by detecting that the temperature of the hot water flowing through the high temperature side connecting pipe 6 has become low. (Thermocouple, bimetal, etc.) 32 is provided.
Further, in the low temperature side connection pipe 8, instead of the flow control mechanism 16, a second temperature detection means (for example, a thermistor) that detects hot water at a set temperature that flows in the low temperature side connection pipe 8 during hot water storage for heat storage. , A thermometer, a thermocouple, etc.) 33 and a second on-off valve 34 as a shut-off mechanism for shutting off the outflow of water from the hot water tank 5 to the hot water tap 3.

  The end of the hot water supply piping 2 and the start of the hot water return piping 7 are connected via a third bypass piping 35, and the third bypass piping 35 is connected from the hot water supply piping 2 to the hot water return piping 7. A second check valve 36 and a second constant flow valve 37 that allow only the flow of hot water are interposed, and even when all the hot water tanks 5 are filled with hot water, a small amount is placed on the hot water supply return pipe 7 side. This is configured to prevent the temperature of the hot water in the hot water supply piping 2 from decreasing.

A flow switch 31, no hot water detection means 32 and second temperature detection means 33 are connected to a controller (not shown), and a second on-off valve 34 is connected to the controller.
When the controller receives a signal from the flow switch 31 and any one of the flow switches 31 detects hot water, the second on-off valve 34 for the hot water storage tank 5 immediately upstream thereof and the second hot water tank 5 for the adjacent hot water storage tank 5 are used. 2 open / close valves 34 or all of the second open / close valves 34 to send hot water from the hot water storage tank 5, and any non-hot water detecting means 32 is open while the second open / close valve 34 is open. The hot water storage tank control mechanism is configured to operate and close the second on-off valve 34 of the hot water storage tank 5 when it is detected that the hot water has disappeared in the hot water storage tank 5.
During hot water storage, the second on-off valve 34 is opened, and the second on-off valve 34 of the hot water storage tank 5 is operated and closed as the second temperature detecting means 33 detects hot water in the hot water storage state. It is configured. Other configurations are the same as those of the first embodiment, and the description is omitted by giving the same reference numerals.

With the above configuration, when all the flow switches 31 have not detected hot water and there is no hot water, and the second temperature detecting means 33 has not detected the temperature of the hot water, the second on-off valve 34 is opened, As shown in FIG. 4, the hot water from the heat source 1 is supplied to the hot water tank 5 so that the hot water can be stored.
Also, when one flow switch 31 detects the hot water and there is hot water, as shown in FIG. 5, all the second on-off valves 34 are opened, and in addition to the hot water from the hot water storage tank 5 immediately upstream, Hot water from the heat source 1 and hot water from all other hot water storage tanks 5 are supplied to the hot-water tap 3 that has detected the hot water supply to supply hot water immediately.
Thereafter, when any hot water detection means 32 detects that no hot water is present in the hot water storage tank 5 while the second on-off valve 34 is open, as shown in FIG. The second on-off valve 34 is operated and closed, and the other hot water from the hot water storage tank 5 and the hot water from the heat source 1 are continuously supplied.

FIG. 7 is an overall schematic configuration diagram showing a specific example, in which a hot-water tap 3 for a bathtub and a hot-water tap 3 for a shower are provided in the bathroom B, and are shared with each other at locations close to the hot-water tap 3 In addition, a hot water storage tank 5 having a relatively large capacity is installed, a hot water tap 3 is provided in each of the bathroom vanity W and the kitchen K, and a small capacity hot water storage tank 5 is installed in a location close to each of the hot water taps 3. ing.
A heat source 1 is installed near a hot water storage tank 5 having a relatively large capacity. The heat source 1 and each hot water storage tank 5 are connected to each other via a hot water supply pipe 2 and a hot water return pipe 7, and the hot water supply pipe 2 Each hot water tap 3 is connected via a branch pipe 4. Each hot water tap 3 and the hot water return pipe 7 are connected via a mixed water supply pipe 17.

FIG. 8 is an overall schematic configuration diagram showing an embodiment of a distributed installation type hot water tank unit according to the present invention.
(A) of FIG. 8 shows the dispersion | distribution installation type hot water storage tank unit U1 used for the hot water storage tank dispersion | distribution installation type hot water supply system of Example 1, and the hot water supply connection port connected to the hot water supply piping 2 at the front-end | tip of the high temperature side connection piping 6 is shown. On the other hand, a water supply connection port 42 connected to the hot water supply return pipe 7 is provided at the tip of the low temperature side connection pipe 8.
In the low temperature side connection pipe 8, a flow control mechanism 16 including a first check valve 13, a first constant flow valve 14, and a first bypass pipe 15 is provided.
The same applies to the hot water tank 5 having different sizes.

  With this configuration, the flow control mechanism 16 is connected between the hot water supply return pipe 2 and the hot water supply return pipe 7 by connecting the hot water supply connection port 41 to the hot water supply return pipe 2 and connecting the water supply connection port 42 to the hot water supply return pipe 7. Can be incorporated, and the hot water storage tank distributed installation type hot water supply system of the first embodiment can be easily constructed.

(B) of FIG. 8 shows the dispersion | distribution installation type hot water storage tank unit U2 used for the hot water storage tank dispersion | distribution installation type hot water supply system of Example 2, and the hot water supply connection port connected to the hot water supply discharge pipe 2 at the front-end | tip of the high temperature side connection piping 6 is shown. On the other hand, a water supply connection port 52 connected to the hot water supply return pipe 7 is provided at the tip of the low temperature side connection pipe 8.
In the low temperature side connection pipe 8, the first check valve 13, the first constant flow valve 14, the first bypass pipe 15, the first on-off valve 21, the second bypass pipe 22, and the first temperature detection means. 23, a flow rate reduction control mechanism 24 is provided.
The same applies to the hot water tank 5 having different sizes.

  With this configuration, by connecting the hot water supply connection port 51 to the hot water supply return pipe 2 and connecting the water supply connection port 52 to the hot water supply return pipe 7, a flow rate reduction control mechanism is provided between the hot water supply return pipe 2 and the hot water supply return pipe 7. The distributed installation type hot water tank unit U2 provided with 24 can be incorporated, and the hot water storage tank distributed installation type hot water supply system of the second embodiment can be easily constructed.

(C) of FIG. 8 shows the dispersion | distribution installation type hot water storage tank unit U3 used for the hot water storage tank dispersion | distribution installation type hot water supply system of Example 3, and the hot water supply connection port connected to the hot water supply outgoing pipe 2 at the front-end | tip of the high temperature side connection piping 6 is shown. On the other hand, a water supply connection port 62 connected to the hot water supply return pipe 7 is provided at the tip of the low temperature side connection pipe 8.
The high temperature side connection pipe 6 is provided with no hot water detection means 32, while the low temperature side connection pipe 8 is provided with second temperature detection means 33 and a second on-off valve 34.
The same applies to the hot water tank 5 having different sizes.

  With this configuration, the hot water supply connection port 61 is connected to the hot water supply return pipe 2, and the water supply connection port 62 is connected to the hot water supply return pipe 7, so that no hot water detection means is provided between the hot water supply return pipe 2 and the hot water supply return pipe 7. The distributed installation type hot water storage tank unit U3 provided with 32, the second temperature detection means 33, and the second on-off valve 34 can be incorporated, and the hot water storage tank distributed installation type hot water supply system of the third embodiment can be easily constructed.

Moreover, although not shown in figure, with respect to the dispersion | distribution installation type hot water storage tank unit U3 used for the hot water storage tank dispersion | distribution installation type hot water supply system of this Example 3, these plural and the following controllers are provided, and a dispersion | distribution installation type hot water storage is provided. You may set it as a tank unit group.
That is, as a controller, signal line connection terminals for three or more flow switches 31, no hot water detection means 32, and second temperature detection means 33 are provided.
When the controller receives a signal from the flow switch 31 and any one of the flow switches 31 detects hot water, the second on-off valve 34 for the hot water tank 5 immediately upstream thereof and the hot water tank 5 in the vicinity thereof. The second on-off valve 34 or all of the second on-off valves 34 are opened to supply hot water from the hot water storage tank 5, and any hot water detection means during the opening of the second on-off valve 34 When the hot water tank 32 detects that hot water has run out, the hot water tank control mechanism is set so that the second on-off valve 34 of the hot water tank 5 is closed by operating.
With such a distributed installation type hot water storage tank unit group, it is possible to more easily construct the hot water storage tank distributed installation type hot water supply system of Example 3 simply by performing pipe connection and wiring connection.

Although the first and second constant flow valves 14 and 37 can be replaced with simple throttle valves or pressure regulating valves, it is desirable to use constant flow valves in order to set the flow rate.
Further, in the above-described embodiment, in order to store heat in a state where temperature stratification is performed, the hot water circulation flow rate is adjusted by controlling the rotational speed of the pump 12, and the outlet temperature of the hot water from the heat source 1 (the first temperature) The temperature detected by the thermometer 10) is set to the set temperature, but the hot water circulation flow rate is reduced by the rotational speed control of the pump 12 or the valve throttle control, etc., and a bypass is provided to circulate the bypass passage. The temperature may be adjusted while the temperature is increased, or the temperature may be adjusted by rising control such as increasing the heating capacity of the heat source device.

  The hot water storage tank 5 in the above-described embodiment may be installed using a useless space under a sink or under a wash bowl in the case of home use. Moreover, in the case of a detached house, you may use under the floor. For this reason, compared with the conventional case where a large-capacity hot water storage tank is installed on the heat source 1 side, there is an advantage that the installation is excellent.

  In the second embodiment, since the hot water is allowed to flow without decreasing the flow rate until the hot water tank 5 is filled with the hot water and the flow rate is decreased after the hot water is filled, the first temperature detecting means 23 is used. The first on-off valve 21 and the first constant flow valve 14 are used, but instead of them, a valve (thermo valve) that closes at a set temperature or higher can also be used.

  As the heat source 1, exhaust heat from a gas engine of a cogeneration system, a hot water boiler, a heat pump, or the like can be used.

  As this invention, you may comprise so that the small hot water tank for stabilizing a warm water temperature near the heat source 1 may be provided. For example, when exhaust heat from a gas engine or the like of a cogeneration system is used as a heat source 1 and is operated mainly by electric power demand, the heating output from the heat source 1 varies due to fluctuations in the amount of exhaust heat. The temperature of hot water fluctuates. This is because the fluctuation of the heating output is absorbed by mixing with the hot water in the hot water tank to stabilize the hot water temperature.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole schematic block diagram which shows Example 1 which concerns on the hot water storage tank dispersion | distribution installation type hot water supply system of this invention in the state at the time of hot water storage. It is a whole schematic block diagram which shows Example 1 in the state at the time of hot-water supply. It is a whole schematic block diagram which shows Example 2 which concerns on the hot water storage tank dispersion | distribution installation type hot water supply system of this invention in the state at the time of hot water storage. It is a whole schematic block diagram which shows Example 3 which concerns on the hot water storage tank dispersion | distribution installation type hot water supply system of this invention in the state at the time of hot water storage. It is a whole schematic block diagram which shows Example 3 in the state which has taken out hot water from the nearest hot water storage tank. It is a whole schematic block diagram which shows Example 3 in the state from which the nearest hot water storage tank is empty and is discharged from another hot water storage tank. It is a whole schematic block diagram which shows a specific example. It is a whole schematic block diagram which shows the Example of the dispersion | distribution installation type hot water storage tank unit which concerns on this invention. It is a whole schematic block diagram which shows a prior art example.

Explanation of symbols

1 ... Heat source
2 ... Hot water supply piping
3 ... Hot water tap (end of hot water demand)
5 ... Hot water tank
7 ... Hot water supply return piping
DESCRIPTION OF SYMBOLS 9 ... Water supply pipe 16 ... Flow control mechanism 17 ... Mixed water supply pipe 21 ... 1st on-off valve 23 ... 1st temperature detection means (warm water amount detection means)
24 ... Flow rate reduction control mechanism 31 ... Flow switch (hot water detection means)
32 ... No hot water detection means 33 ... Second temperature detection means 34 ... Second on-off valve (shut-off mechanism)

Claims (9)

A hot water supply pipe connected to a heat source is connected to a hot water storage tank and a plurality of hot water supply demand ends that are intermittently used and distributed, and hot water output from the heat source is supplied to the hot water storage tank. A hot water supply system configured to store hot water stored in the hot water storage tank so as to be supplied to the hot water supply demand end,
The hot water storage tank is connected to the hot water supply outlet pipe at a position immediately upstream of each of the hot water supply demand ends, a hot water return pipe for circulation during hot water storage is connected to the hot water storage tank, and a hot water supply pipe is connected to the hot water return pipe. A hot water storage tank distributed installation type hot water supply system that is configured to be connected to the hot water supply demand end by applying pressure from the lower part of the hot water storage tank during hot water supply. The hot water storage tank distributed installation type hot water supply system according to claim 1,
The hot water supply return pipe has a hot water tank distributed installation that is equipped with a flow control mechanism that restricts the flow rate from the hot water tank to the hot water return pipe side and does not restrict the flow from the water supply pipe to the hot water tank side. Type hot water supply system. The hot water storage tank distributed installation type hot water supply system according to claim 1,
Hot water amount detecting means for detecting the amount of hot water stored in the hot water tank;
Flow rate control means for controlling the flow rate of hot water flowing into the hot water storage tank;
A flow rate reduction control mechanism that suppresses the flow rate of hot water flowing into the hot water storage tank to a set flow rate that is smaller than that during normal hot water storage when the hot water amount detection means detects storage of a hot water amount of a predetermined amount or more;
Hot water storage system with hot water tanks distributed. The hot water storage tank distributed installation type hot water supply system according to claim 1,
Hot water detection means attached to each hot water supply demand end for detecting hot water from the hot water supply demand end;
A shut-off mechanism attached to each hot water storage tank to block outflow of water from the hot water storage tank to the hot water supply demand end;
No hot water detection means for detecting that the hot water stored in the hot water tank attached to each hot water tank is gone,
When any hot water detection means detects hot water, the hot water is sent from the hot water tank by opening the shut-off mechanism in the vicinity or immediately including the upstream, and while the shut-off mechanism is open, When the hot water detection means detects that no hot water is in the hot water tank, a hot water tank control mechanism that operates a shut-off mechanism of the hot water tank,
Hot water storage system with hot water tanks distributed. In the hot water storage tank distributed installation type hot water supply system according to any one of claims 1, 2, 3, and 4,
In the hot water supply return pipe, a constant flow mechanism that makes the flow rate constant or a pressure regulation mechanism that makes the differential pressure between the inlet and outlet of the heat source constant is interposed between the connection point with the water supply pipe and the heat source. Hot water storage system with distributed hot water storage tanks. In the hot water storage tank distributed installation type hot water supply system according to any one of claims 1, 2, 3, 4, and 5,
A hot water storage system in which hot water supply pipes are connected across a hot water supply return pipe and a hot water supply demand end. A distributed installation type hot water storage tank unit used in the hot water storage tank distributed installation type hot water supply system according to claim 2,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, a water supply connection port connected to the hot water return pipe is provided on the other end side, and flows between the hot water supply connection port and the water supply connection port. A distributed hot water storage tank unit having a control mechanism attached thereto. A distributed hot water storage tank unit used in the hot water storage tank distributed hot water supply system according to claim 3,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, a water supply connection port connected to the hot water return pipe is provided on the other end side, and hot water is provided between the hot water supply connection port and the water supply connection port. A distributed installation type hot water storage tank unit comprising a volume detection unit, a flow rate control unit, and a flow rate reduction control mechanism. A distributed hot water storage tank unit used in the hot water storage tank distributed hot water supply system according to claim 4,
A hot water supply connection port connected to the hot water supply outlet pipe is provided on one end side of the hot water storage tank, and a water supply connection port connected to the hot water return pipe is provided on the other end side, and is cut off between the hot water supply connection port and the water supply connection port. A mechanism, no hot water detection means, and a signal from the hot water detection means, and when the hot water detection means detects hot water, the hot water is sent out from the hot water storage tank by opening the shut-off mechanism; and A hot water tank limiting control mechanism for operating the shut-off mechanism when the no-hot water detecting means detects that hot water has run out in the hot water tank while the shut-off mechanism is open is provided. Distributed water storage tank unit.

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