JP2002022273A - Hot water storing type hot water feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a hot water storing at a low temperature and a hot water storing at a high temperature in a rational manner in response to a certain circumstance when hot water is stored in a hot water storing tank and improve an energy saving characteristic. SOLUTION: A comparing means 20 compares a hot water feeding demand amount immediately required and specified by a hot water feeding demand-specifying means 16 with a hot water storing amount capable of being stored into a hot water storing tank at a low temperature mode. A high temperature instruction signal is outputted when the hot water feeding demand amount is larger than a hot water storing enabling amount as found in the case that hot water is fed into a bath tub, for example. A temperature set by a hot water temperature setting means 17 is set to a temperature of high temperature mode by a high temperature hot water storing control means 21 and the hot water storing is carried out under that state. With such an arrangement as above, when an amount of hot water of low temperature is not fulfilled to the hot water feeding demand amount even if the hot water is stored full in the hot water storing tank, hot water storing with the hot water of high temperature is carried out under a state of setting to the high temperature mode, a calorie stored in the hot water storing tank is increased more than that of storing of hot water of low temperature, a rate of utilization of waste heat from a thermal-electrical supplying device is improved and an energy saving characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type heat generating apparatus for driving a compressor and the like, which generates electric power and exhaust heat, such as an integrated engine and a generator or a fuel cell. Heat from a heat source such as a waste heat generator that generates waste heat, or a heat pump type heat generator itself is collected, and the hot water obtained by the heat is stored in a hot water storage tank in a state of forming a temperature stratification,
The present invention relates to a hot water storage type hot water supply system used for hot water supply for washing dishes in a bathtub, a shower, a washbasin, and a kitchen while replenishing a shortage with the heat of an auxiliary heat source such as a gas-fired boiler.

[0002]

2. Description of the Related Art When hot water is supplied into a bathtub, that is, when hot water is filled, a large amount of heat is required at a time. On the other hand, when constructing a system, it is preferable to reduce the capacity of the hot water storage tank. Therefore, in the past, in consideration of cooling with water, hot water was stored in the hot water storage tank as high as possible, the hot water was supplied into the bathtub, and the shortage was supplemented with an auxiliary heat source, requiring a large amount of hot water Hot water demand.

[0003]

However, if a large amount of hot water is required in excess of the capacity of the hot water storage tank, storing the capacity with low-temperature hot water increases the amount of heat shortage, and There is a disadvantage that the use time of the heat source is increased and the efficiency is reduced.

[0004] On the other hand, in the case of hot water supply demand other than hot water filling in a bathtub, such as hot water supply for washing dishes or washing dishes in a kitchen, the required amount of hot water is small and the amount of heat is also small. In such a case, it may be preferable to store the low-temperature hot water earlier than the high-temperature hot water in the hot water storage tank.

Further, for example, when storing hot water for the demand for hot water supply in the morning of the next day, if the hot water is stored, the temperature becomes lower than the temperature that can be used for hot water supply. There was a drawback that the efficiency was reduced due to the use of the auxiliary heat source.

[0006] The present invention has been made in view of such circumstances, and when storing hot water in a hot water storage tank,
It is an object of the present invention to rationally adopt low-temperature hot water storage and high-temperature hot water storage according to the situation, and to improve energy saving.

[0007]

The invention according to claim 1 is
In order to achieve the above-mentioned object, a circulating pipe taken out from the lower part and supplied from the upper part is attached, and a hot water storage tank for storing hot water in a state where a temperature stratification is formed, and a heat source provided in the circulating pipe for heating And a hot water supply pipe connected to an upper portion of the hot water storage tank and supplying hot water in the hot water storage tank to a hot water supply required point, and an auxiliary heat source for increasing a temperature of hot water supplied to the hot water supply required point Flow path switching means for switching between a hot water storage state in which hot water heated by the heat source is supplied in a state where a temperature stratification is formed in an upper portion of the hot water storage tank and a non-hot water storage state in which the hot water is reheated by the heat source; A hot water temperature sensor for measuring the temperature of the hot water heated by the heat source, hot water temperature setting means for setting the temperature in the low temperature mode and the temperature in the high temperature mode higher than the low temperature mode, and the hot water temperature sensor. Flow path switching control means for switching the flow path switching means from the non-hot water storage state to the hot water storage state when the measured temperature exceeds the temperature set by the hot water temperature setting means; and A hot water demand specifying means for specifying the hot water demand is compared with the latest hot water demand based on the time and the hot water demand specified by the hot water demand specifying means and the amount of hot water that can be stored in the low temperature mode in the hot water storage tank. Comparing means for outputting a high-temperature command signal when the hot water demand is greater than the hot water storage capacity,
High-temperature hot-water storage control means for storing hot water in a state where the temperature set by the hot-water temperature setting means is set to a high-temperature mode temperature in response to a high-temperature command signal from the comparing means.

In order to achieve the above object, the hot water supply type hot water supply system according to the second aspect of the present invention provides a hot water supply hot water supply system according to the first aspect of the present invention, which is specified by hot water supply demand specifying means. Means for calculating the possible amount of hot water that can be stored in the low-temperature mode in the hot water storage tank by the time of the second time, and comparing means with the latest hot water supply demand and the latest hot water demand as the possible hot water storage amount. It is configured to compare the amount.

According to a third aspect of the present invention, there is provided a hot water storage tank for storing a hot water in a state where a temperature stratification is formed by attaching a circulation pipe taken out from a lower part and supplied from an upper part to achieve the above-mentioned object. A heat source provided in the circulation pipe for heating, a hot water supply pipe connected to an upper portion of the hot water storage tank and supplying hot water in the hot water storage tank to a hot water supply required point, and hot water supplied to the hot water supply required point A hot water supply type hot water supply system including an auxiliary heat source that raises the temperature, wherein the hot water heated by the heat source is supplied in a state where a temperature stratification is formed on an upper portion of the hot water storage tank, and the hot water is reheated by the heat source. Flow path switching means for switching to a non-hot water storage state, a hot water temperature sensor for measuring the temperature of hot water after being heated by the heat source, and setting of a temperature in a low-temperature mode and a temperature in a high-temperature mode higher than the low-temperature mode. Hot water temperature setting means, and flow path switching control means for switching the flow path switching means from a non-hot water storage state to a hot water storage state when a temperature measured by the hot water temperature sensor exceeds a temperature set by the hot water temperature setting means. ,
Hot water supply demand specifying means for specifying the time and the amount of hot water demand for performing the hot water supply to the hot water required point, the scheduled hot water supply time until the time for performing the hot water supply specified by the hot water demand specifying means, and the hot water demand specifying means for specifying Comparing means for comparing the expected hot water supply amount with the scheduled hot water storage time required for storing hot water in the hot water storage tank in the high temperature mode, and outputting a low temperature command signal when the scheduled hot water storage time is longer than the scheduled hot water supply time,
Low-temperature hot water storage control means for storing hot water in a state where the temperature set by the hot water temperature setting means is set to the temperature of the low-temperature mode in response to a low-temperature command signal from the comparing means. system.

According to a fourth aspect of the present invention, there is provided a hot water storage tank for storing hot water in a state in which a temperature stratification is formed by attaching a circulation pipe taken out from a lower part and supplied from an upper part to achieve the above object. A heat source provided in the circulation pipe for heating, a hot water supply pipe connected to an upper portion of the hot water storage tank and supplying hot water in the hot water storage tank to a hot water supply required point, and hot water supplied to the hot water supply required point A hot water supply type hot water supply system including an auxiliary heat source that raises the temperature, wherein the hot water heated by the heat source is supplied in a state where a temperature stratification is formed on an upper portion of the hot water storage tank, and the hot water is reheated by the heat source. Flow path switching means for switching to a non-hot water storage state, a hot water temperature sensor for measuring the temperature of hot water after being heated by the heat source, and setting of a temperature in a low-temperature mode and a temperature in a high-temperature mode higher than the low-temperature mode. Hot water temperature setting means, and flow path switching control means for switching the flow path switching means from a non-hot water storage state to a hot water storage state when a temperature measured by the hot water temperature sensor exceeds a temperature set by the hot water temperature setting means. ,
A hot water supply demand specifying unit that specifies a time and a hot water demand amount for performing the hot water supply to the hot water needing point; and a hot water supply scheduled time until the hot water supply time that is specified by the hot water demand specification unit. An estimated hot water temperature calculating means for calculating an expected temperature of hot water in the hot water storage tank after a lapse of a scheduled hot water supply time when storing hot water, and an expected temperature calculated by the expected hot water temperature calculating means and a temperature available for hot water supply. Comparing means for outputting a high-temperature command signal when the expected temperature is lower than the hot water supply available temperature; and setting the temperature set by the hot water temperature setting means in the high-temperature mode in response to the high-temperature command signal from the comparing means. High-temperature hot-water storage control means for storing hot water in a state set to a temperature.

[0011]

According to the configuration of the hot water supply type hot water supply system according to the first aspect of the present invention, the latest hot water supply specifying means such as a reservation or a learning function based on the same time on the same day of the previous day or one week ago is specified. When the hot water demand is larger than the amount of hot water that can be stored in the low temperature mode in the hot water storage tank,
In other words, when the hot water supply demand is insufficient even when the low-temperature hot water is fully stored in the hot water storage tank, the hot water is stored in the high-temperature mode with the high-temperature mode set, and the amount of heat stored in the hot water storage tank is stored in the low-temperature hot water. Than can be increased.

Further, according to the configuration of the hot water supply type hot water supply system according to the second aspect of the present invention, even if low-temperature hot water is stored in the hot water storage tank by the time of the latest hot water supply demand, the latest hot water supply demand When the temperature is insufficient, the hot water is stored in the hot water storage tank with the high temperature mode set, and the amount of heat stored in the hot water storage tank can be increased as compared with the case of storing the hot water in the low temperature hot water. More specifically, if low-temperature hot water can be stored in a full hot water storage tank, the latest hot water supply demand can be covered, but there is no time to fill the hot water storage tank full, and it cannot be stored by the latest hot water demand. Can be dealt with in some cases.

Further, according to the configuration of the hot water supply type hot water supply system according to the third aspect of the present invention, the hot water supply demand specifying means such as a reservation or a learning function based on the same time on the same day of the previous day or one week before is specified. When the scheduled hot water supply time up to the latest time is longer than the scheduled hot water storage time required to store the latest hot water demand in the hot water storage tank in the high-temperature mode by the hot water demand specified by the hot water demand specifying means, that is, when the hot water storage tank When hot water is stored, when the hot water supply demand cannot be met, hot water can be stored with the low-temperature hot water in a state set at the low-temperature mode, and hot water can be supplied earlier than when hot water is stored in the hot-water storage tank. More specifically, for example, when hot water is stored in a hot water storage tank in a stratified state, the water taken out from the lower part of the hot water storage tank into the circulation pipe is heated by a heat source and must not be higher than the temperature set by the hot water temperature setting means. Return to the hot water storage tank through the branch pipe, and uniformly heat the lower part of the hot water storage tank, thereby raising the temperature,
When the temperature becomes higher than the temperature set by the hot water temperature setting means due to reheating of the heat source, the hot water is supplied from the upper portion of the hot water storage tank in a state where a temperature stratification is formed. However, if the set temperature is high, it takes time to exceed the set temperature, so that hot water cannot be stored in the hot water storage tank and hot water cannot be supplied. Therefore, the set temperature is lowered to store hot water in the hot water storage tank so that hot water can be supplied.

Further, according to the configuration of the hot water supply type hot water supply system of the invention according to claim 4, the hot water supply demand specifying means such as a reservation or a learning function based on the same time on the same day of the previous day or one week before is specified. In consideration of the fact that the temperature of the hot water stored in the hot water storage tank will be lowered by heat radiation by the time when hot water is supplied, the expected temperature of the hot water that will be lowered by the heat radiation when stored in the low temperature mode in the hot water storage tank is Calculates and when the predicted temperature is lower than the temperature available for hot water supply, performs hot water storage with the high temperature mode set in the high temperature mode, ensuring a higher temperature than the temperature used for hot water supply regardless of heat radiation It can be so.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram showing an embodiment of a hot-water storage type hot-water supply system according to the present invention. 1 is a cogeneration system as a heat source configured to drive a generator by a gas engine, and 2 is a hot-water storage tank. Is shown.

A circulation pipe 4 having a first pump 3 is connected to the hot water storage tank 2 from the bottom to the top. A heat exchanger 5 is provided in the circulation pipe 4, and a waste heat recovery circulation pipe 7 having a second pump 6 is connected between the heat exchanger 5 and the cogeneration system 1.

With this configuration, jacket cooling water as an exhaust heat recovery heat medium is circulated between the cogeneration system 1 and the heat exchanger 5, and water taken out from the lower part of the hot water storage tank 2 is discharged from the cogeneration system 1. , And the heated heat storage water is circulated through the circulation pipe 4 and supplied to the hot water storage tank 2 to store heat. As the exhaust heat recovery heat medium, a refrigerant such as chlorofluorocarbon or carbon dioxide may be used.

A hot water supply pipe 8 is connected to the hot water storage tank 2, and a hot water supply pipe 8 is connected to a hot tub 9, a branch hot water supply pipe 10 to a hot water supply location such as a kitchen, a washroom, and a shower. It is configured so that hot water can be taken out and supplied to various places. The hot water supply pipe 8 is provided with a gas-fired boiler 11 as an auxiliary heat source, and is configured to cope with a shortage of hot water in the hot water storage tank 2 due to an increase in hot water supply demand. The gas-fired boiler 11 may be provided between the heat exchanger 5 of the circulation pipe 4 and the hot water storage tank 2.

The branch pipe 1 extends from the heat exchanger 5 of the circulation pipe 4 to the lower part of the hot water storage tank 2 through a three-way valve 12 as a flow path switching means.
3 are connected. Thereby, the hot water that has passed through the heat exchanger 5 is supplied from the upper part of the hot water storage tank 2 in a state where a temperature stratification is formed to store the hot water, and the hot water is supplied to the branch pipe 13, and the heat exchanger 5 is supplied through the circulation pipe 4. Is switched to a non-hot water storage state in which the hot water is supplied again and reheated.

A hot water temperature sensor 14 for measuring the temperature of hot water passing through the heat exchanger 5 is provided in the circulation pipe 4 between the heat exchanger 5 and the three-way valve 12. The hot water temperature sensor 14 is connected to the microcomputer 15, and the three-way valve 11 is connected to the microcomputer 15.

Further, as shown in the block diagram of the first embodiment of FIG. In hot water supply demand specifying means 16,
The time to supply hot water to the bathtub 9, kitchen, lavatory, shower, or other hot water supply location and the hot water demand are identified by a reservation or a learning function based on the same time on the same day of the previous day or one week before. It has become.

The microcomputer 15 includes a hot water temperature setting means 17, a hot water temperature comparing means 18, and a flow path switching control means 1.
9, a comparison means 20 and a high-temperature hot-water storage control means 21 are provided. The hot water temperature setting means 17 is configured to switch the set temperature between a low temperature mode temperature (for example, 65 ° C.) and a higher temperature mode temperature (for example, 75 ° C.).

In the hot water temperature comparing means 18, the hot water setting means 17
(The temperature in the low-temperature mode or the temperature in the high-temperature mode) is compared with the temperature of the hot water that has passed through the heat exchanger 5 and measured by the hot water temperature sensor 14, and when the temperature of the hot water is higher than the set temperature, A high-temperature signal is output, and a low-temperature signal is output when the temperature of the hot water is lower than the set temperature.

The flow path switching control means 19 switches the three-way valve 12 to the hot water storage state in response to the high temperature signal from the hot water temperature comparing means 18, and stores the hot water higher than the set temperature passed through the heat exchanger 5 in the hot water storage tank 2. The three-way valve 12 is switched to a non-hot-water storage state in response to a low-temperature signal from the hot-water temperature comparison means 18, and is supplied at a temperature lower than the set temperature passed through the heat exchanger 5. Hot water is supplied to the lower part of the hot water storage tank 2 through the branch pipe 13.

In the comparison means 20, the hot water supply demand specifying means 16
The latest hot water supply demand based on the time and the hot water demand demand specified by the above is compared with the amount of hot water that can be stored in the hot water storage tank 2 in the low temperature mode, for example, when hot water is filled into the bathtub 9, A high temperature command signal is output when the hot water supply demand is larger than the hot water storage capacity.

In the high-temperature hot-water storage control means 21, the comparison means 20
In response to the high temperature command signal from the controller, the temperature set by the hot water temperature setting means 17 is set to the high temperature mode temperature, and hot water is stored in that state.

According to the first embodiment, the high temperature mode is set when the hot water supply demand is insufficient even when the low temperature hot water is stored in the hot water tank 2 as in the case of filling the bathtub 9 with hot water. Hot water is stored in the hot water storage tank 2 in this state, and the amount of heat stored in the hot water storage tank 2 is increased as compared with the case where the hot water is stored in the low temperature hot water. Here, the shortage of the hot water supply demand is compensated by operating the gas-fired boiler 11, but the hot water demand to be supplemented by the gas-fired boiler 11 is reduced, and the energy saving can be improved also in this respect.

FIG. 3 is a block diagram of the second embodiment.
The differences from the first embodiment are as follows. That is, the possible hot water storage amount calculating means 31 is added, and the possible hot water storage amount calculating means 31 calculates the possible hot water storage amount that can be stored in the hot water storage tank 2 in the low temperature mode by the latest time specified by the hot water supply demand specifying means 16. It is to be calculated.

The comparing means 21 includes a possible hot water storage amount calculating means 3.
The available hot water storage amount calculated in step 1 is input as the available hot water storage amount, and the available hot water storage amount is compared with the latest hot water supply demand. When the latest hot water supply demand is larger than the hot water storage possible, a high temperature command signal is output. It is supposed to. Other configurations and operations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

According to the second embodiment, for example, the bathtub 9
When there is a demand for hot water at a short time immediately after the completion of filling the hot water into the tank, and the hot water demand is insufficient even when the low-temperature hot water is stored in the hot water storage tank 2 until that time, the high-temperature mode is set and the high-temperature mode is set. Hot water is stored using hot water, and the amount of heat stored in the hot water storage tank 2 is increased as compared with the case where low-temperature hot water is stored, the utilization rate of the exhaust heat from the combined heat and power supply device 1 is increased, and energy saving can be improved.

Therefore, the present embodiment is superior to the first embodiment in the following points. That is, in the first embodiment, the comparing means 21
Since the latest hot water supply demand is compared with the hot water storage capacity that can be fully stored in the hot water storage tank 2, if the latest hot water demand is less than the hot water storage capacity that can be fully stored in the hot water storage tank 2, The temperature set by the temperature setting means 17 remains at the low-temperature mode temperature. Therefore, even if the most recent hot water supply demand is less than the amount that can be stored, if there is no time to fully store the low-temperature hot water in the hot water storage tank 2 as described above, the hot water runs short at the required time, In the second embodiment, occurrence of a situation such as hot water supply can be avoided in advance.

FIG. 4 is a block diagram of the third embodiment.
The differences from the first embodiment are as follows. That is, in place of the comparison means 20 and the high-temperature hot-water storage control means 21, a scheduled hot-water supply time calculation means 41, a scheduled hot-water storage time calculation means 42, a comparison means 43, and a low-temperature hot water storage control means 44 are provided.

The scheduled hot water supply time calculating means 41 calculates the scheduled hot water supply time up to the time of hot water supply based on the time specified by the hot water demand identifying means 16.

The estimated hot water storage time calculating means 42 calculates the hot water demand based on the hot water demand specified by the hot water demand specifying means 16.
The scheduled hot water storage time required for storing the hot water demand in the high temperature mode in the hot water storage tank is calculated.

The comparing means 43 compares the estimated hot water supply time calculated by the estimated hot water supply time calculating means 41 with the estimated hot water storage time calculated by the estimated hot water storage time calculating means 42, and the estimated hot water storage time is longer than the estimated hot water supply time. Sometimes, a low-temperature command signal is output.

In the low-temperature hot-water storage control means 44, the comparison means 43
The temperature set by the hot water temperature setting means 17 is set to the temperature in the low temperature mode in response to the low temperature command signal from the controller, and the hot water is stored in that state. Other configurations and operations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

According to the third embodiment, when high-temperature hot water is stored in the hot-water storage tank 2, when the hot water supply demand cannot be met, hot-water storage with low-temperature hot water is performed with the temperature set to the low-temperature mode. Hot water can be supplied faster than storing hot water in a hot water storage tank. For example, when hot water is stored in the hot water storage tank 2 in a temperature stratified state, water taken out from the lower part of the hot water storage tank 2 into the circulation pipe 4 is heated by the heat exchanger 5 and becomes higher than the temperature set by the hot water temperature setting means 17. If not, branch piping 1
3 and is uniformly heated in the lower portion of the hot water storage tank 2, thereby increasing the temperature. When the temperature becomes higher than the temperature set by the hot water temperature setting means 17, the upper portion of the hot water storage tank 2 is heated. The hot water is supplied in a state where a thermal stratification is formed. However, if the set temperature is high, it takes time to exceed the set temperature, and no hot water is stored in the hot water storage tank 2, so that hot water cannot be supplied. Therefore, the set temperature is lowered so that hot water can be stored in the hot water storage tank 2 so that hot water can be supplied.

FIG. 5 is a block diagram of the fourth embodiment.
The differences from the first embodiment are as follows. That is, the predicted hot water temperature calculating means 51 is added, and the predicted hot water temperature calculating means 51 stores the hot water at the low-temperature mode temperature based on the scheduled hot water supply time up to the time when the hot water is specified by the hot water demand specifying means 16. The expected temperature of the hot water in the hot water storage tank 2 after the elapse of the scheduled hot water supply time is calculated.

The comparing means 20 includes an expected hot water temperature calculating means 51
Is compared with the temperature that can be used for hot water supply, and outputs a high temperature command signal when the predicted temperature is lower than the hot water usable temperature (for example, 42 ° C.). Other configurations and operations are the same as those of the first embodiment, and the same reference numerals are given and the description thereof is omitted.

According to the fourth embodiment, for example, when there is a demand for hot water supply such as a shower in the morning of the next day, and when hot water is stored in the hot water storage tank 2 in the low-temperature mode, the hot water supply demand time is reached. When the temperature of the hot water is lower than the temperature used for hot water supply, the hot water is stored in the high temperature mode, and the temperature is higher than the temperature used for hot water supply regardless of heat release By securing the temperature, it can be made to have excellent usability. Further, when the temperature becomes lower than a temperature that can be used for hot water supply, it is possible to avoid using the gas-fired boiler 11 to slightly raise the temperature,
The utilization rate of the combined heat and power supply device 1 can be increased, and energy saving can be improved. On the other hand, even if hot water is stored in the hot water storage tank 2 in the low-temperature mode, regardless of heat radiation, if a temperature higher than the temperature used for hot water supply can be secured, the hot water is stored in the low-temperature mode and the drive time of the cogeneration system 1 is reduced. And running costs can be reduced.

In the above embodiment, the three-way valve 12 is switched to the non-hot water storage state in order to heat the temperature of the hot water passed through the heat exchanger 5 to a set temperature (low-temperature mode temperature or high-temperature mode temperature) or higher. The hot water that has passed through the water heater 5 is configured to be supplied to the lower portion of the hot water storage tank 2. However, in the present invention, for example, a spare tank or a circulation pipe is provided separately from the hot water storage tank 2, and the hot water is passed through the heat exchanger 5. Hot water, spare tank and heat exchanger 5
And circulate in the circulation pipe and reheat in the heat exchanger 5, and after the temperature becomes higher than the set temperature,
A configuration in which hot water that has passed through the heat exchanger 5 is stored in the hot water storage tank 2 may be used, and various heating configurations can be adopted.

According to the present invention, as the cogeneration system 1,
The present invention can be applied to a device using a fuel cell, and is not limited to the cogeneration system 1, but a waste heat generation device such as a heat pump type heat generation device configured to drive a compressor constituting a refrigerant circuit for air conditioning with a gas engine. Also, the above-described heat pump type heat generator itself or a solar panel receiving solar heat can be applied. In short, the present invention includes a heating device of a type in which the temperature rise due to heating is gradual and cannot cope with a rapid temperature rise. It can be applied to the hot water supply system to be configured, and is collectively referred to as a heat source, including the exhaust heat generator, the heat pump heat generator, and the solar panel that receives solar heat.

Further, in the hot water supply type hot water supply system of the present invention, an electric heater may be used as an auxiliary heat source instead of the gas fired boiler 11 as in the above embodiment.

[0044]

As is apparent from the above description, according to the hot water storage type hot water supply system of the first aspect of the present invention, even if low-temperature hot water is stored in a full hot water storage tank, it is possible to make a reservation, a day before or one week ago. When the hot water supply demand specified by the hot water demand specifying means such as a learning function based on the same time of the same day of the week is insufficient, the hot water is stored in the hot water storage tank with the hot water set in the high temperature mode. Since the amount of heat is increased compared to the case of storing with low-temperature hot water, the amount of heat that is insufficient for the latest hot water supply demand can be reduced as a whole,
The operation time of the auxiliary heat source for compensating for the shortage can be shortened, the utilization rate of the heat source can be increased, and the energy saving can be improved.

According to the hot water supply type hot water supply system of the second aspect of the present invention, the possible hot water storage capacity of the low-temperature hot water in the hot water storage tank up to the time of the latest hot water supply demand is defined as the hot water storage capacity, and When the hot water demand is insufficient, hot water can be stored with hot water in the high-temperature mode, and if the low-temperature hot water can be stored in the hot water tank, the hot water demand can be covered. It is possible to cope with the case where there is not enough time to fill up and it is not possible to store up to the amount of hot water demand immediately. Hot water can be satisfactorily supplied by avoiding a shortage of hot water, and the utilization rate of the heat source can be increased and energy saving can be improved as described above.

According to the hot water supply type hot water supply system of the third aspect of the present invention, if high-temperature hot water is stored in the hot water storage tank, learning based on a reservation, the same time on the same day of the previous day or one week before, etc. When the hot water demand specified by the hot water demand specifying means such as the function cannot be met, the hot water is stored with the low-temperature hot water with the temperature set to the low-temperature mode, and the hot water is stored in the hot water storage tank earlier. Since hot water can be supplied, it is possible to satisfactorily respond to the demand for hot water such as hot water for washing dishes and washing dishes in the kitchen, and to provide an excellent usability. In particular, in winter, the temperature of the water supplied to the hot water storage tank is low, and it is easy to cool down due to heat radiation, and when hot water is stored, it takes more time to supply hot water. Excellent in usability. In addition, it is possible to suppress the use of the auxiliary heat source due to prolonged time during which hot water cannot be supplied, thereby increasing the utilization rate of the heat source and improving energy saving.

Further, according to the hot water storage type hot water supply system of the invention according to claim 4, the hot water supply specified by the hot water supply specifying means such as a reservation or a learning function based on the same time on the same day of the previous day or one week ago is used. By the time you do
When the temperature of hot water stored in the low-temperature mode in the hot water storage tank becomes lower than the temperature used for hot water supply due to heat radiation,
Hot water is stored with high-temperature hot water in the high-temperature mode, and a temperature higher than the temperature used for hot water supply is ensured regardless of heat radiation. Moreover, when the temperature becomes lower than the temperature that can be used for hot water supply, the auxiliary heat source is used to slightly increase the temperature, thereby lowering the efficiency. However, according to the invention according to claim 4, Use of such an auxiliary heat source can be avoided, the utilization rate of the heat source can be increased, and energy saving can be improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a hot water supply type hot water supply system according to the present invention.

FIG. 2 is a block diagram of the first embodiment.

FIG. 3 is a block diagram of a second embodiment.

FIG. 4 is a block diagram of a third embodiment.

FIG. 5 is a block diagram of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Combined heat and power supply (heat source) 2 ... Hot water storage tank 4 ... Circulation piping 8 ... Hot water supply pipe 11 ... Gas fired boiler (auxiliary heat source) 12 ... Three-way valve (flow path switching means) 13 ... Branch piping 14 ... Hot water temperature sensor 16 ... Hot water supply demand specifying means 17 Hot water temperature setting means 19 Flow path switching control means 20 Comparison means 21 High temperature hot water storage control means 31 Possible hot water storage amount calculation means 43 Comparison means 44 Low temperature hot water storage control means 51 Expected hot water temperature calculation means

Claims (4)

[Claims] 1. A hot water storage tank provided with a circulation pipe taken out from a lower part and supplied from an upper part to store hot water in a state where a temperature stratification is formed; a heat source provided in the circulation pipe for heating; A hot-water supply type hot-water supply system comprising: a hot-water supply pipe connected to an upper portion and configured to supply hot water in the hot-water storage tank to a hot-water supply required point; and an auxiliary heat source configured to increase a temperature of hot water supplied to the hot-water supply required point, Flow path switching means for switching between a hot water storage state in which hot water heated by the heat source is supplied in a state where a temperature stratification is formed above the hot water storage tank and a non-hot water storage state in which the hot water is reheated by the heat source; A hot water temperature sensor for measuring the temperature of the hot water, a hot water temperature setting means for setting a temperature in the low temperature mode and a temperature in the high temperature mode higher than the low temperature mode, and a temperature measured by the hot water temperature sensor Flow path switching control means for switching the flow path switching means from a non-hot water storage state to a hot water storage state when the temperature exceeds a temperature set by the hot water temperature setting means; and specifying a time and a hot water supply demand for performing hot water supply to the hot water supply required point. Hot water demand specifying means, and comparing the latest hot water demand based on the time and hot water demand determined by the hot water demand specifying means with the amount of hot water that can be stored in the hot water storage tank in the low temperature mode. Means for outputting a high-temperature command signal when the temperature is larger than the hot water storage capacity; and storing the hot water in a state in which the temperature set by the hot-water temperature setting means is set to the high-temperature mode in response to the high-temperature command signal from the comparison means. And a high-temperature hot-water storage control means for performing hot water storage. 2. A hot water storage amount calculating means for calculating a possible hot water storage amount in the low temperature mode in the hot water storage tank by the latest time specified by the hot water supply demand specifying means, and a comparing means, The hot-water storage type hot-water supply system according to claim 1, wherein the hot-water supply type hot-water supply system according to claim 1, wherein the latest hot-water supply demand amount and the hot-water storage possible amount are compared with the amount as the hot-water storage amount. 3. A hot water storage tank for storing hot water in a state of forming a temperature stratification by attaching a circulation pipe taken out from a lower part and supplied from an upper part, a heat source provided in the circulation pipe for heating, and A hot-water supply type hot-water supply system comprising: a hot-water supply pipe connected to an upper portion and configured to supply hot water in the hot-water storage tank to a hot-water supply required point; and an auxiliary heat source configured to increase a temperature of hot water supplied to the hot-water supply required point, Flow path switching means for switching between a hot water storage state in which hot water heated by the heat source is supplied in a state where a temperature stratification is formed above the hot water storage tank and a non-hot water storage state in which the hot water is reheated by the heat source; A hot water temperature sensor for measuring the temperature of the hot water, a hot water temperature setting means for setting a temperature in the low temperature mode and a temperature in the high temperature mode higher than the low temperature mode, and a temperature measured by the hot water temperature sensor Flow path switching control means for switching the flow path switching means from a non-hot water storage state to a hot water storage state when the temperature exceeds a temperature set by the hot water temperature setting means; and specifying a time and a hot water supply demand for performing hot water supply to the hot water supply required point. Hot water supply demand specifying means, hot water supply scheduled time until the time of performing hot water supply specified by the hot water supply demand specifying means, and hot water demand amount specified by the hot water demand specifying means are stored in the hot water storage tank in a high temperature mode. Comparing means for outputting a low-temperature command signal when the estimated hot-water storage time is longer than the expected hot-water supply time by comparing the estimated hot-water storage time with the expected hot-water storage time. And a low-temperature hot-water storage control means for storing hot water with the set temperature set to the low-temperature mode temperature. 4. A hot water storage tank for storing hot water in a state of forming a thermal stratification by attaching a circulation pipe taken out from a lower part and supplied from an upper part, a heat source provided in the circulation pipe for heating, and A hot-water supply type hot-water supply system comprising: a hot-water supply pipe connected to an upper portion and configured to supply hot water in the hot-water storage tank to a hot-water supply required point; and an auxiliary heat source configured to increase a temperature of hot water supplied to the hot-water supply required point, Flow path switching means for switching between a hot water storage state in which hot water heated by the heat source is supplied in a state where a temperature stratification is formed above the hot water storage tank and a non-hot water storage state in which the hot water is reheated by the heat source; A hot water temperature sensor for measuring the temperature of the hot water, a hot water temperature setting means for setting a temperature in the low temperature mode and a temperature in the high temperature mode higher than the low temperature mode, and a temperature measured by the hot water temperature sensor Flow path switching control means for switching the flow path switching means from a non-hot water storage state to a hot water storage state when the temperature exceeds a temperature set by the hot water temperature setting means; and specifying a time and a hot water supply demand for performing hot water supply to the hot water supply required point. A hot water supply demand specifying means to perform hot water supply in the hot water storage tank after a lapse of the scheduled hot water supply time when the hot water is stored at a temperature in the low-temperature mode, based on the scheduled hot water supply time until the time of performing the hot water supply specified by the hot water supply demand specifying means The expected hot water temperature calculating means for calculating the expected temperature of the hot water supply, and comparing the expected temperature calculated by the expected hot water temperature calculating means with the temperature available for hot water supply, when the expected temperature is lower than the hot water supply available temperature Comparing means for outputting a high-temperature command signal; storing the temperature set by the hot water temperature setting means in the high-temperature mode in response to the high-temperature command signal from the comparing means; Hot water storage type hot-water supply system, characterized in that and a hot hot water storage control means for performing.