KR20120002275A - Hot-water supply system using solar heat - Google Patents

Hot-water supply system using solar heat Download PDF

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Publication number
KR20120002275A
KR20120002275A KR1020100063074A KR20100063074A KR20120002275A KR 20120002275 A KR20120002275 A KR 20120002275A KR 1020100063074 A KR1020100063074 A KR 1020100063074A KR 20100063074 A KR20100063074 A KR 20100063074A KR 20120002275 A KR20120002275 A KR 20120002275A
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KR
South Korea
Prior art keywords
hot water
temperature
storage tank
heat storage
circulation pipe
Prior art date
Application number
KR1020100063074A
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Korean (ko)
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KR101203033B1 (en
Inventor
홍희기
Original Assignee
경희대학교 산학협력단
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Application filed by 경희대학교 산학협력단 filed Critical 경희대학교 산학협력단
Priority to KR20100063074A priority Critical patent/KR101203033B1/en
Priority to PCT/KR2011/001507 priority patent/WO2011108885A2/en
Publication of KR20120002275A publication Critical patent/KR20120002275A/en
Priority to US13/603,874 priority patent/US20130014745A1/en
Application granted granted Critical
Publication of KR101203033B1 publication Critical patent/KR101203033B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/005—Hot-water central heating systems combined with solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/08—Storage tanks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

Abstract

The present invention relates to a solar hot water system. The present invention, a collector for collecting solar heat; A collector circulation pipe connected to the collector and configured to circulate a working medium in which solar heat collected by the collector is accumulated therein; A heat storage tank in which heat exchange is performed between the working medium and water used for living; A hot water circulation pipe communicating with the heat storage tank and supplied with the water; A freeze prevention valve provided at one side of the hot water circulation pipe and selectively opened and closed to selectively flow water in the heat storage tank into the hot water circulation pipe; And a controller for controlling the operation of the freeze protection valve according to a temperature change of at least one of a temperature T 1 of a predetermined portion of the hot water circulation pipe and a water temperature T 2 of the heat storage tank to prevent freezing of the hot water circulation pipe. It is configured to include.
According to the present invention, the controller operates the freeze protection valve and the freeze protection heater appropriately in consideration of only the change in the temperature (T1) of the hot water discharge pipe or in consideration of both the change in the temperature (T1) of the hot water discharge pipe and the water temperature (T2) inside the heat storage tank. Let's do it. Therefore, it is possible to prevent freezing in the winter through a simple structure, the efficiency of the solar hot water system is improved, the configuration of the system is simplified.

Description

Hot-water supply system using solar heat}

The present invention relates to a solar hot water system, and more particularly, to a system for producing hot water using heat collected by solar heat.

Recently, as the alternative energy for petroleum resources, technologies that generate electricity using solar heat or apply hot water systems are increasing. In accordance with this trend, solar hot water systems that produce hot water using solar heat have been widely commercialized.

1 is a configuration diagram of an embodiment of a solar hot water system according to the prior art. The solar hot water system 10 includes a collector 11 in which solar heat is largely collected, a hot water circulation pipe 12 through which hot water circulates, a circulation pump C for forced circulation of hot water, and a heat storage tank 14 in which heated hot water is stored. Consists of Living water is introduced into one side of the hot water circulation pipe 12 is stored in the heat storage tank (14). The introduced living water is heated while passing through the collector 11 and stored in the heat storage tank 14 again, and the living water stored in the heat storage tank 14 flows out again through the other side of the hot water circulation pipe 12 to be used. do. In this embodiment, since the hot water is directly heated in the collector 11, the thermal efficiency is very high and the configuration thereof is very simple, so there is little possibility of failure. However, there is a problem that can not be used in the area of the temperature falling below zero because the risk of freezing of the hot water circulation pipe 12 is very large when the temperature drops sharply in the winter, it is almost not commercialized.

2 shows another embodiment of a solar hot water system according to the prior art. According to the present embodiment, the solar hot water system 20 is largely connected to the collector 21 and the collector 21, a collector circulation pipe 26 through which a working medium for transferring heat collected therein, and hot water flows. It consists of a hot water circulation pipe 28 and a heat storage tank 22 through which heat exchange between the working medium and hot water is performed. The heat storage tank 22 is composed of an outer tank 23 and an inner tank 24 located inside the outer tank 23. The outer tank 23 is in communication with the collector circulation pipe 26, the inner tank 24 is in communication with the hot water circulation pipe 28. The working medium flows to the outer tank 23, the living water flows to the inner tank 24, and heat exchange is performed. The working medium is an antifreeze is used to prevent freezing of the collector circulation pipe (26).

The hot water circulation pipe 28 is provided with a heating wire 30 surrounding the outside. The heating wire 30 is to prevent the freezing of the pipe water by freezing the living water inside the hot water circulation pipe 28 at the time when there is no use of the water for the winter. In winter, when the external temperature falls below a predetermined temperature, current flows through the heating wire 30 to heat the hot water circulation pipe 28 to prevent freezing.

However, the prior art having such a configuration has the following problems. The method of preventing the freezing of the hot water circulation pipe 28 by using the heating wire 3 has a very high power consumption in winter when the temperature continues to drop below freezing, and the heating wire is cut off during frequent operation, and its efficiency is increased. This is low and there is a problem that the maintenance cost also increases.

An object of the present invention is to solve the problems of the prior art as described above, to prevent the freezing of the heat storage tank and the hot water discharge pipe by operating the freeze protection valve and the freeze protection heater according to the temperature change of the hot water circulation pipe and the temperature of the heat storage tank. Its purpose is to.

According to a feature of the present invention for achieving the object as described above, the present invention comprises a collector for collecting solar heat; A collector circulation pipe connected to the collector and configured to circulate a working medium in which solar heat collected by the collector is accumulated therein; A heat storage tank having an outer tank communicating with the collector circulation pipe and an inner tank separated from the outer tank in the outer tank; A hot water circulation pipe communicating with the heat storage tank and supplied with water; Is provided on one side of the hot water circulation pipe temperature T1 of a predetermined portion of the hot water circulation pipe is opened and closed at a specific temperature to flow the water of the heat storage tank into the hot water circulation pipe to prevent the hot water circulation pipe is freezing. Freeze protection valve; And a controller for controlling the operation of the freeze protection valve according to a temperature change of at least one of a temperature T 1 of a predetermined portion of the hot water circulation pipe and a water temperature T 2 of the heat storage tank to prevent freezing of the hot water circulation pipe. It is configured to include.

The controller opens the freeze prevention valve when the temperature T1 of the predetermined portion of the hot water circulation pipe is T1 <Ta (1 ° C. ≤ Ta≤6 ° C.), and the temperature T1 of the predetermined part of the hot water circulation pipe. When T1> Tc (9 ° C ≤ Tc ≤ 11 ° C) can be closed the freeze protection valve.

The controller opens the freeze protection valve when the temperature T1 of the predetermined portion of the hot water circulation pipe is T1 <Ta (3 ° C. ≤ Ta≤6 ° C.), and the temperature T1 of the predetermined part of the hot water circulation pipe. And when the water temperature T2 of the heat storage tank satisfies the following conditions 1) and 2), the freeze protection valve may be closed.

- next -

1) T2> Tb, T1> Tc

2) T2 ≤ Tb, T1> T2-dT

※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃

Ta may be 4 ° C, Tb is 12 ° C, Tc is 10 ° C, and dT may be 2 ° C.

According to another feature of the invention, the present invention is a collector for collecting solar heat; A collector circulation pipe connected to the collector and configured to circulate a working medium in which solar heat collected by the collector is accumulated therein; A heat storage tank having an outer tank communicating with the collector circulation pipe and an inner tank separated from the outer tank in the outer tank; A hot water circulation pipe communicating with the heat storage tank and configured to include a hot water introduction pipe through which water is supplied to the heat storage tank, and a hot water discharge pipe through which water is discharged; A connection pipe communicating the hot water inlet pipe and the hot water discharge pipe with each other; A check valve provided in the connection pipe to selectively open and close the connection pipe; A circulation pump provided in the connection pipe and configured to circulate water along the hot water inlet pipe and the hot water discharge pipe through the connection pipe; And a controller for controlling the operation of the circulation pump according to the temperature T1 of the predetermined portion of the hot water circulation pipe and the water temperature T2 of the heat storage tank.

The controller operates the circulation pump when the temperature T1 of the predetermined portion of the hot water circulation pipe is T1 <Ta (1 ° C. ≤ Ta≤6 ° C.), and the temperature T1 of the predetermined part of the hot water circulation pipe and When the water temperature T2 of the heat storage tank satisfies the following conditions 1) and 2), the operation of the circulation pump may be stopped.

- next -

1) T2> Tb, T1> 10 ° C

2) T2 ≤ Tb, T1> T2-dT

※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃

Ta may be 2 ° C, Tb is 12 ° C, Tc is 10 ° C, and dT may be 2 ° C.

The freeze control heater is controlled by the controller, and further comprises a freeze protection heater that serves to adjust the temperature of the water of the heat storage tank, and when the water temperature (T2) of the heat storage tank is T2 <12 ℃ and operating the freeze protection heater When the water temperature T2 of the heat storage tank is T2> 14 ° C., the freeze protection heater may be stopped.

The freeze control heater, which is controlled by the controller and serves to adjust the temperature of the water in the heat storage tank, is configured, and the controller further comprises the freeze protection heater when the water temperature T2 of the heat storage tank is T2 <6 ° C. When the water temperature (T2) of the heat storage tank is T2> 8 ℃ can be stopped the freeze protection heater.

According to the present invention, in consideration of only the temperature T1 change of the hot water discharge pipe or at least one or more temperature changes of the temperature T1 of the hot water discharge pipe and the water temperature T2 inside the heat storage tank, the controller may appropriately freeze valve (or circulation). Pump) and freeze protection heater. By such an operation control, the water of a relatively high temperature inside the heat storage tank can be heated by moving inside the hot water circulation pipe.

Accordingly, the hot water circulation pipe can be prevented from freezing in the winter through a simple structure, so that the efficiency of the solar hot water system is improved, and the configuration of the system is simplified since it does not require a heating wire to control the temperature of the hot water circulation pipe separately. It works.

In addition, since the temperature of the hot water circulation pipe is controlled using hot water inside the heat storage tank, the cost for maintenance of the solar hot water system is reduced.

In addition, since the change in the water temperature (T2) in the heat storage tank as well as the hot water discharge pipe temperature (T1) during the operation of the freeze protection heater, the electricity consumption is significantly reduced, thereby reducing the maintenance cost of the hot water system.

1 is a block diagram of an embodiment of a solar hot water system according to the prior art.
2 is a block diagram of another embodiment of a solar hot water system according to the prior art.
3 is a block diagram of a preferred embodiment of the solar hot water system according to the present invention.
4 and 5 is a configuration diagram showing the flow of hot water and the working medium in the solar hot water system according to the first embodiment of the present invention.
6 and 7 is a configuration diagram showing the operation of the valve and the flow of hot water to prevent freezing in the solar hot water system according to a second embodiment of the present invention.
8 is a block diagram of a solar hot water system according to a third embodiment of the present invention.
9 and 10 are diagrams showing the operation of the solar hot water system according to the third embodiment of the present invention and the flow of hot water.

Hereinafter, the configuration of a preferred embodiment of the solar hot water system according to the present invention will be described in detail with reference to the drawings.

3 shows a preferred embodiment of the solar hot water system according to the present invention.

The solar hot water system 100 is provided with a collector 110. The collector 110 serves to effectively collect solar heat, and various types of collectors such as a vacuum tube type and a plate type may be used.

The collector 110 is connected to the collector circulation pipe 115. The collector circulation pipe 115 is a closed pipe not connected to the outside so that a part of the collector circulation pipe 115 is located inside the collector 110. The collector circulation pipe 115 acts as a passage through which the working medium to be described later flows, while the working medium flows through the collector circulation pipe 115, the portion of the collector circulation pipe 115 located in the collector 110 is formed. When passing, it absorbs the solar heat collected by the collector 110 and serves to deliver to the living water to be described later.

Although not shown, a portion of the collector circulation pipe 115 located in the collector 110 is widely distributed inside the collector 110 so that heat collected by the collector 110 can be transferred to the working medium as much as possible. It is desirable to be able to. The collector circulation pipe 115 may be wrapped with a heat insulating material to prevent heat from being transferred to the outside. In addition, although not shown, the collector circulation pipe 115 may be provided with a circulation pump so that a working medium can circulate smoothly inside the collector circulation pipe 115.

An operating medium (not shown) flows inside the collector circulation pipe 115. The working medium flows through the collector circulation pipe 115 and serves to transfer heat of the collector 110. The working medium is generally used antifreeze, which does not freeze even at relatively low temperatures.

The solar hot water system 100 is provided with a hot water circulation pipe 120. The hot water circulation pipe 120 serves as a passage through which the water used for living, namely, the living water (tap water) supplied from the tap water, moves and the temperature of the water increases in the course of flowing the hot water circulation pipe 120. In more detail, the hot water circulation pipe 120 is heat-exchanged with the working medium (by conduction) while the living water is heated.

The hot water circulation pipe 120 is connected to the water supply for supplying the living water to one side as an open pipe on both sides, the water is introduced, and the living water (hot water) is the temperature rise while passing through the hot water circulation pipe 120 It is discharged to the other side and used for living. The hot water inlet pipe 123, the side in which water is introduced into the heat storage tank 130, which will be described later in the hot water circulation pipe 120, the side in which the water is discharged inside the heat storage tank 130 will be referred to as a hot water discharge pipe (125).

The hot water discharge pipe 125 may be in a relatively high position compared to the hot water inlet pipe 123. Hot water stored in the inner tank (130a) is hot water of a higher temperature because the temperature of the hot water in a relatively high position in the inner tank (130a) is higher than the temperature of the hot water in the lower position by the stratification effect To use Since the hot water inlet pipe 123 is connected to the water supply, a separate circulation pump is not necessary.

As shown in FIG. 3, one side of the hot water discharge pipe 125 is provided with a hot water discharge pipe 125 ′. The hot water discharge pipe 125 ′ communicates with the hot water discharge pipe 125 to serve as a passage through which the water existing in the heat storage tank 130 to be described later is discharged through the hot water discharge pipe 125. Although not shown in the drawing, the hot water outlet pipe 125 ′ may be connected to a heavy water tank. The heavy water tank is a tank for storing living water and hot water discharged through the hot water discharge pipe 125 ', which is to reuse the living water discharged through the hot water discharge pipe 125'. The hot water stored in the heavy water tank may be used in a bathroom or the like as the heavy water.

The hot water discharge pipe 125 'is provided with a freeze prevention valve 125 ". The freeze prevention valve 125" serves to selectively open and close the hot water discharge pipe 125'. More specifically, the freeze protection valve 125 ″ is opened when a part of the temperature T1 of the hot water inlet pipe 123 falls below a predetermined temperature, so that the temperature is relatively high to the hot water inlet pipe 123. The water stored in the high inner tank 130a is allowed to flow in. The water flowing through the hot water inlet pipe 123 is discharged to the hot water discharge pipe 125 by its own weight and stored in a heavy water tank (not shown). Become recycled.

Water, by its nature, has a larger volume of liquid (ice) than liquid. The hot water circulation pipe 120 is always filled with water, but in the time period (night time) when no water is used, the water inside the hot water circulation pipe 120, in particular, the hot water discharge pipe 125 is placed in a standing state without flowing. . If the living water is frozen due to the temperature drop, the hot water circulation pipe 120 freezes due to volume expansion.

Therefore, when the temperature of the hot water inlet pipe 123 falls below a predetermined temperature, the water stored in the internal tank 130a having a relatively high temperature is more precisely than the hot water circulation pipe 120, The temperature is raised to prevent the hot water circulation pipe 120 from freezing.

At this time, since the temperature of the hot water discharge pipe 125 is relatively low in the portion exposed to the outside air, it is preferable to measure the temperature of the portion of the hot water discharge pipe 123 exposed to the outside air.

The opening degree of the freeze protection valve 125 " changes according to the temperature change of the hot water inlet pipe 123. That is, as the temperature of the hot water discharge pipe 125 decreases relatively much, the freeze prevention valve By increasing the opening degree of 125 ", a lot of hot water flows, thereby raising the temperature of the hot water circulation pipe 120.

When the temperature T1 of a part of the hot water inlet pipe 123 rises above a predetermined temperature, the freeze protection valve 125 ″ is closed again.

The solar hot water system 100 is provided with a heat storage tank (130). The heat storage tank 130 is a space where heat is exchanged between the working medium and the living water. The heat storage tank 130 is preferably wrapped with a heat insulating material so that heat is not released to the outside to increase the efficiency of heat exchange. The heat storage tank 130 is largely composed of an inner tank (130a) and an outer tank (130b) surrounding the inner tank (130a). As shown in FIG. 3, the inner tank 130a and the outer tank 130b are not in communication with each other, and a predetermined space is allowed to flow between the inner tank 130a and the outer tank 130b. Is formed.

The outer tank 130b is in communication with the collector circulation pipe 115, and the inner tank 130a is in communication with the hot water circulation pipe 120. The working medium flowing through the collector circulation pipe 115 transfers heat to the inner tank 130a while flowing into the outer tank 130b, and the heat transferred to the inner tank 130a is used for living water. Increase the temperature of the hot water will be. The outer tank 130b and the inner tank 130a may be formed of a material such as copper having high thermal conductivity in order to increase heat exchange efficiency. The inner tank 130a preferably has a surface area in contact with a working medium existing in the outer tank 130b so as to facilitate heat transfer.

The solar hot water system 100 may further include a freeze protection heater 135. The freeze protection heater 135 serves to control the temperature (T2) of the inner tank (130a). That is, the temperature T2 of the inner tank 130a is adjusted by applying heat according to the change of the temperature T2 of the inner tank 130a. The freeze protection heater 135 is provided with a heating wire 135 'and a portion of the heating wire 135' is located in the inner tank 130a. The freeze protection heater 135 is connected to the controller C to be described later, when the temperature of the inner tank 130a falls below a predetermined temperature, current flows to the heating wire 135 'to generate heat. The temperature of the inner tank 130a can be maintained at a constant temperature to some extent to prevent the inner tank 130a from freezing. In addition, by increasing the temperature of the hot water located in the inner tank, the temperature of the hot water discharged to the hot water circulation pipe is increased to prevent the hot water circulation pipe 120 is frozen.

The freeze protection valve 125 " and the freeze protection heater 135 are connected to a controller C. The controller C also measures the temperature of the hot water inlet pipe 123 and the inner tank 130a. The controller (C) controls the opening and closing of the freeze protection valve (125 ″) by measuring the temperature of the hot water circulation pipe (120) and the inner tank (130a). Then, the operation of the freeze protection heater 135 is controlled. The sensor S of the hot water inlet pipe 123 may be mounted at a portion of the hot water inlet pipe 123 exposed to the outside air, which is the lowest temperature portion.

Hereinafter, the controller C will control the freeze protection valve 125 ″ and the freeze protection heater 135 in order to prevent freezing in the solar hot water system according to the present invention. Each embodiment is the same as the configuration of each of the solar hot water system 100, but according to the change of the conditions of the temperature (T1, T2) the freeze prevention valve 125 "and freeze prevention heater 135 By varying the process of controlling the configuration of the solar hot water system 100 is the same. Hereinafter, the first embodiment will be described.

First Example

4 and 5 is a block diagram showing the flow of hot water and the working medium in the solar hot water system according to the first embodiment of the present invention.

According to this embodiment, the controller is more preferably when the temperature (T1) of the hot water circulation pipe 120, more specifically the hot water discharge pipe 125 is T1 <Ta (1 ℃ ≤ Ta ≤ 6 ℃) When Ta = 4 ° C opens the freeze protection valve 125 ". At this time, the range of Ta can be set according to the season and region, on average, considering the seasonal changes in the tap water It is most preferable to set it to 4 degreeC, since it is 4 degreeC minimum.

When the freeze protection valve 125 ″ is opened, the water present in the heat storage tank 130, more specifically, the internal tank inside the heat storage tank 130, passes through the hot water discharge pipe 125 and the hot water discharge pipe ( 125 ') The water present in the heat storage tank 130 is heat of relatively high temperature water passing through the hot water discharge pipe 125 and the temperature of the hot water discharge pipe 125 is increased. .

The temperature T1 of the hot water discharge pipe 125 is increased by opening the freeze protection valve 125 ″, and the temperature T1 of the hot water discharge pipe 125 is T1> Tc (9 ° C. ≦ Tc ≦ 11 C), preferably rising to Tc = 10 ° C, the controller closes the freeze protection valve 125 ", as shown in FIG. The range of the Tc is the value that can be set according to the season and region, such as Ta, considering the annual average tap water temperature, it is most preferable when Ta = 10 ℃. In addition, when the Ta value is 10 ° C. or lower, the operation of the freeze protection valve 125 ″ becomes frequent and the efficiency of the entire system decreases. When the freeze protection valve 125 ″ is closed, the inside of the heat storage tank 130 The water supply is interrupted.

As such, when the controller adjusts the freeze protection valve 125 ″, the temperature of the hot water discharge pipe 125 ′ is most preferable (when Ta = 4 ° C. and Tc = 10 ° C.). 4 ° C. <T1 <10 This is controlled to maintain this temperature because the average temperature of tap water is between 4 ℃ ~ 10 ℃.

In the most preferable case (Ta = 4 ℃, Tc = 10 ℃) temperature (T1) of the hot water discharge pipe 125 is at most 10 ℃, the temperature of the water in the heat storage tank 130 is maintained at least 10 ℃ or more You have to. Therefore, the controller operates the freeze protection heater 135 when the temperature T2 of the water in the heat storage tank 130 drops to T2 <10 ° C. When the freeze protection heater 135 is operated, the temperature T2 of the water in the heat storage tank 130 is increased. When the temperature T2 of the water in the heat storage tank 130 becomes higher than a predetermined temperature, preferably T2> 12 ° C. by the operation of the freeze protection heater 135, the freeze protection heater 135 stops operating. . As such, the controller controls the freeze prevention valve 125 ″ and the freeze prevention heater 135 to prevent freezing of the hot water circulation pipe 120 during the winter, and does not require a separate heater. Maintenance cost of the hot water system 100 is reduced.

Hereinafter, a solar hot water system 100 according to a second embodiment of the present invention will be described with reference to the drawings.

2nd Example

6 and 7 is a configuration diagram showing the operation of the valve for preventing the freeze and the flow of hot water in the solar hot water system according to the second embodiment of the present invention.

The first embodiment is not suitable for extreme fat because the operating time of the freeze protection heater 135 can be long when used in the extreme fat. Therefore, the solar hot water system according to the second embodiment suitable for use in the extreme region will be described.

According to this embodiment, the controller is more preferably when the temperature (T1) of a part of the hot water discharge pipe 125 is T1 <Ta (1 ℃ ≤ Ta ≤ 6 ℃), more preferably Ta = 4 ℃ 125 "). When the freeze protection valve 125" is opened, water existing in the heat storage tank 130, and more specifically, the internal tank inside the heat storage tank 130, opens the hot water discharge pipe 125. It is discharged into the hot water outlet pipe (125 '). The water present in the heat storage tank 130 is heat of relatively high temperature water passing through the hot water discharge pipe 125 and the temperature of the hot water discharge pipe 125 is increased.

Thereafter, when the temperature T1 of the hot water discharge pipe 125 satisfies the conditions of the following 1) and 2), the controller closes the freeze protection valve 125 ″.

- next -

1) T2> Tb, T1> Tc

2) T2 ≤ Tb, T1> T2-dT

※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃

1) When the temperature (T2) of the water in the heat storage tank 130 is T2> Tb (11 ℃ <Tb ≤ 14 ℃), the temperature of the temperature (T1) of the hot water discharge pipe 125 is T1> Tc (9 ° C ≤ Tc ≤ 11 ° C), 2) when the temperature T2 of the water in the heat storage tank 130 is T2 ≤ Tb (11 ° C <Tb ≤ 14 ° C), the temperature of the hot water discharge pipe 125 The freeze prevention valve 125 "is closed when the temperature of T1 is T1> T2-dT (1 DEG C? DT? 3 DEG C).

In the present embodiment, the temperature T1 of the hot water discharge tube 125 as well as the temperature T2 of the water in the heat storage tank 130 are adjusted to suit each other's conditions. This is because the temperature is relatively very low in the case of extreme fat, it is difficult to maintain the temperature (T2) of the water in the heat storage tank 130 above a certain temperature as in the first embodiment, and the amount of power required when using the freeze protection heater for this purpose Because it is very large. Therefore, the controller controls the freeze protection valve 125 ″ in consideration of the temperature T2 of the water in the heat storage tank 130.

Most preferably, Ta is 4 ° C, Tb is 12 ° C, Tc is 10 ° C, and dT is 2 ° C. The reason why the dT is 2 ° C is because the minimum value for preventing the malfunction of the controller is 2 ° C, and the Tb is 12 ° C in consideration of the dT value and the Tc value. In the case of Ta and Tc, the description is the same as in the case of the first embodiment.

In the most preferred case (Ta = 4 ° C, Tb = 12 ° C, Tc = 10 ° C, dT = 2 ° C), the temperature T2 of the water inside the heat storage tank 130 may open the freeze protection valve 125 ". It should be maintained at 6 ℃ or higher in order to maintain the reference temperature above 4 ℃ and to satisfy the condition of 2) above. (In condition 2), T1> T2-2 ℃, so T1 should be kept at least 6 ℃ Therefore, the controller operates the freeze protection heater 135 to raise the water temperature T2 of the heat storage tank 130 when the temperature T2 of the water in the heat storage tank 130 is T2 <6 ° C. When the temperature T2 of the water in the heat storage tank 130 is T2> 8 ° C., the operation of the freeze protection heater 135 is stopped.

According to the second embodiment as described above, in consideration of the water temperature (T2) of the heat storage tank 130 as well as the temperature (T1) of the hot water discharge pipe 125, the controller is the freeze protection valve (125 ") and the freeze wave Since the prevention heater 135 is controlled, the temperature T2 of the heat storage tank 130 in the extreme region does not have to be maintained at a temperature higher than necessary, so that the efficiency of the solar hot water system 100 is improved and maintenance costs are reduced. do.

3rd Example

Hereinafter, a solar hot water system according to a third embodiment will be described in detail with reference to the accompanying drawings.

8 is a block diagram of a solar hot water system according to a third embodiment of the present invention, Figure 9 and 10 is a block diagram showing the operation of the solar hot water system according to the third embodiment of the present invention and the flow of hot water Is shown.

The configuration of the third embodiment is the configuration of the connecting pipe 227, the check valve (cv), the circulation pump (P), the other configuration is the same bar, will be described with respect to these components.

A connection pipe 227 is provided between the hot water inlet pipe 223 and the hot water discharge pipe 225. The connection pipe 227 serves to communicate with each other of the hot water inlet pipe 223 and the hot water discharge pipe 225 is the water inside the heat storage tank 230 through the connection pipe 227 is the hot water inlet pipe ( 223 and the hot water discharge pipe 225 is circulated inside. That is, the water of the heat storage tank 230 discharged through the hot water discharge pipe 225 is introduced again into the hot water inlet pipe 223 through the connection pipe 227.

The connection pipe 227 is provided with a check valve (cv). The check valve cv serves to selectively communicate with the connection pipe 227 to allow only one flow through the connection pipe 227. More specifically, it is to selectively open and close to enable only the flow from the hot water inlet pipe 223 to the hot water discharge pipe 225, or the flow from the hot water discharge pipe 225 to the hot water inlet pipe 223. . In the present embodiment, a case in which the check valve cv is opened when water flows from the hot water discharge pipe 225 to the hot water inlet pipe 223 will be described by way of example.

The connection pipe 227 is provided with a circulation pump (P). The circulation pump (P) serves to provide power to the water flow through the connection pipe 227. In this embodiment, the circulation pump P provides power so that water flows from the hot water discharge pipe 225 to the hot water inlet pipe 223.

The circulation pump P is controlled by the controller C. Let's look at the control of the circulation pump (P) in detail.

According to this embodiment, the controller C is more preferably Ta = 2 ° C when the temperature T1 of a part of the hot water discharge pipes 225 and 225 is T1 <Ta (1 ° C <Ta <6 ° C). In this case, the circulation pump P is operated. When the circulation pump (P) is operated, the heat storage tank (230, 130), more specifically, the water present in the internal tank (230a) inside the heat storage tank 230 is the hot water discharge pipe (225, 125) and Passed through the connection pipe 227 to the hot water inlet pipe 223 is again introduced into the inner tank (230a) of the heat storage tank (230). Through such a path to increase the temperature of the hot water discharge pipe 225 and the hot water inlet pipe 223 with water of a relatively high temperature of the inner tank (230a). When the circulation pump P is operated, the check valve cv is opened so that water flows through the connection pipe 227.

Thereafter, when the temperature T1 of the hot water discharge pipe 225 satisfies the conditions of the following 1) and 2), the controller C stops the operation of the circulation pump P.

- next -

1) T2> Tb, T1> Tc

2) T2 ≤ Tb, T1> T2-dT

※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃

1) When the temperature (T2) of the water in the heat storage tank 230 is T2> Tb (11 ℃ <Tb ≤ 14 ℃), the temperature of the temperature (T1) of the hot water discharge pipe 225 is T1> Tc (9 ° C. ≦ Tc ≦ 11 ° C.), or 2) when the temperature T2 of the water in the heat storage tank 230 is T2 ≦ Tb (11 ° C. <Tb ≦ 14 ° C.), the hot water discharge pipe 225 The circulation pump P is stopped when the temperature T1 is T1> T2−dT (1 ° C. ≦ dT ≦ 3 ° C.).

When the operation of the circulation pump P is stopped, the check valve cv is closed according to the condition, so that water does not flow back through the connection pipe 227.

In this embodiment, as in the second embodiment, the temperature T1 of the hot water discharge pipes 225 and 125 as well as the temperature T2 of the water in the heat storage tank 230 are adjusted to suit each other's conditions. It was. At this time, since the amount of power for the operation of the circulation pump (P) is consumed less than when the heating wire is operated, the efficiency is better, and it is possible to obtain the same effect as preventing the freezing wave by flowing tap water in winter. It is not necessary to heat the heat storage tank 230 separately at a low temperature. However, it is also possible to use a separate freeze protection heater 235 preliminarily, and at this time, the operating conditions of the freeze protection heater 235 are the same as in the second embodiment, so a separate description will be omitted.

Most preferably, Ta is 2 ° C, Tb is 12 ° C, Tc is 10 ° C, and dT is 2 ° C. At this time, since the set values are the same as in the second embodiment, a separate description will be omitted.

According to this third embodiment, the water inside the hot water discharge pipe 225 and the hot water inlet pipe 223 allows the water in the heat storage tank 230 to circulate so that the solar hot water system 200 at a relatively low temperature. It can prevent the freezing of the wire and improve the efficiency, which will reduce the maintenance cost.

The scope of the present invention is not limited to the embodiments described above, but is defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self evident.

100: solar hot water system 110: collector
115: collector circulation pipe 120: hot water circulation pipe
123: hot water inlet pipe 125: hot water discharge pipe
125 ': Hot water outlet pipe 125 ": Freeze protection valve
130: heat storage tank 130a: inner tank
130b: external tank 135: freeze protection heater
135 ': hot wire 227: connecting valve
C: Controller S, S ': Sensor
P: Circulation pump cv: Check valve

Claims (9)

A collector that collects solar heat;
A collector circulation pipe connected to the collector and configured to circulate a working medium in which solar heat collected by the collector is accumulated therein;
A heat storage tank in which heat exchange is performed between the working medium and water used for living;
A hot water circulation pipe communicating with the heat storage tank and supplied with the water;
A freeze prevention valve provided at one side of the hot water circulation pipe and selectively opened and closed to selectively flow water in the heat storage tank into the hot water circulation pipe; And
And a controller for controlling the operation of the freeze protection valve according to a temperature change of at least one of the temperature T 1 of the predetermined portion of the hot water circulation pipe and the water temperature T 2 of the heat storage tank to prevent freezing of the hot water circulation pipe. Solar hot water system.
The method of claim 1,
The controller
When the temperature (T1) of a predetermined portion of the hot water circulation pipe is T1 <Ta (1 ℃ ≤ Ta ≤ 6 ℃), the freeze protection valve is opened, the temperature (T1) of a predetermined portion of the hot water circulation pipe is T1> Tc (9 ℃ ≤ Tc ≤ 11 ℃) solar hot water system, characterized in that for closing the freeze protection valve.

The method of claim 1,
The controller
If the temperature (T1) of a predetermined portion of the hot water circulation pipe is T1 <Ta (3 ℃ ≤ Ta ≤ 6 ℃), open the freeze protection valve,
And the freezing prevention valve is closed when the temperature (T1) of the predetermined portion of the hot water circulation pipe and the water temperature (T2) of the heat storage tank satisfy the following conditions 1) and 2).
- next -
1) T2> Tb, T1> Tc
2) T2 ≤ Tb, T1> T2-dT
※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃
The method according to claim 2 or 3,
The Ta is 4 ℃, the Tb is 12 ℃, the Tc is 10 ℃, the dT is a solar hot water system, characterized in that 2 ℃
A collector that collects solar heat;
A collector circulation pipe connected to the collector and configured to circulate a working medium in which solar heat collected by the collector is accumulated therein;
A heat storage tank in which heat exchange is performed between the working medium and water used for living;
A hot water circulation pipe communicating with the heat storage tank and configured to include a hot water inlet pipe through which water is supplied to the heat storage tank, and a hot water discharge pipe through which water is discharged;
A connection pipe communicating the hot water inlet pipe and the hot water discharge pipe with each other;
A check valve provided in the connection pipe to selectively open and close the connection pipe;
A circulation pump provided in the connection pipe and configured to circulate water along the hot water inlet pipe and the hot water discharge pipe through the connection pipe; And
And a controller for controlling the operation of the circulation pump according to a temperature change of at least one of the temperature T1 of the predetermined portion of the hot water circulation pipe and the water temperature T2 of the heat storage tank to prevent freezing of the hot water circulation pipe. Solar hot water system composed.
The method of claim 5, wherein
The controller
When the temperature (T1) of a predetermined portion of the hot water circulation pipe is T1 <Ta (1 ℃ ≤ Ta ≤ 6 ℃) to operate the circulation pump,
The solar hot water system, characterized in that the operation of the circulation pump is stopped when the temperature (T1) of the predetermined portion of the hot water circulation pipe and the water temperature (T2) of the heat storage tank satisfies the following conditions 1) and 2).
- next -
1) T2> Tb, T1> 10 ° C
2) T2 ≤ Tb, T1> T2-dT
※ 11 ℃ <Tb ≤14 ℃, 9 ℃ ≤Tc≤11 ℃, 1 ℃ ≤dT≤3 ℃
The method according to claim 6,
The Ta is 2 ℃, the Tb is 12 ℃, the Tc is 10 ℃, the dT is a solar hot water system, characterized in that 2 ℃
The method of claim 2,
It is configured by the controller, and further comprising a freeze protection heater that serves to adjust the temperature of the water of the heat storage tank,
When the water temperature (T2) of the heat storage tank is T2 <12 ℃ the freeze protection heater is operated, when the water temperature (T2) of the heat storage tank is the solar heat characterized in that to stop the freeze protection heater Hot water system.
The method according to claim 3 or 6, wherein
It is configured by the controller, and further comprising a freeze protection heater that serves to adjust the temperature of the water of the heat storage tank,
The controller operates the freeze protection heater when the water temperature T2 of the heat storage tank is T2 <6 ° C, and stops the freeze protection heater when the water temperature T2 of the heat storage tank is T2> 8 ° C. Solar hot water system.

KR20100063074A 2010-03-05 2010-06-30 Hot-water supply system using solar heat KR101203033B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR20100063074A KR101203033B1 (en) 2010-06-30 2010-06-30 Hot-water supply system using solar heat
PCT/KR2011/001507 WO2011108885A2 (en) 2010-03-05 2011-03-04 Solar water heating system
US13/603,874 US20130014745A1 (en) 2010-03-05 2012-09-05 Solar water heating system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20100063074A KR101203033B1 (en) 2010-06-30 2010-06-30 Hot-water supply system using solar heat

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102878689A (en) * 2012-09-18 2013-01-16 张太恩 Solar water heater provided with anti-freezing energy-saving air valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101376059B1 (en) * 2013-01-11 2014-04-01 경희대학교 산학협력단 Natural circulation type hot-water supply system using solar heat for local heating
KR101432041B1 (en) 2013-03-06 2014-08-21 경희대학교 산학협력단 Control method of local heating for solar hot water supply system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5129756A (en) * 1974-09-06 1976-03-13 Hitachi Ltd
CA2140202C (en) 1995-01-13 1999-01-19 Douglas Robinson Sanford Hart Method and apparatus to provide freeze protection for solar water heating systems
JP2004144382A (en) 2002-10-24 2004-05-20 Noritz Corp Water heater utilizing solar heat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102878689A (en) * 2012-09-18 2013-01-16 张太恩 Solar water heater provided with anti-freezing energy-saving air valve

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