KR101034808B1 - Overheat protection apparatus for solar heating system - Google Patents

Abstract

The present invention relates to a solar heater for storing heat energy collected by a heat collector (25) in a heat storage tank (22) to provide heating and hot water supply: a heat medium conduit (31) (32) between the heat storage tank (22) and the heat collector (25). A bypass pipe (35) installed at the side and having a three-way valve (36) for controlling the flow path; Heat exchangers 33 and 34 respectively installed on one side of the heat medium conduits 31 and 32 and the bypass pipe 35; A controller 40 which detects a temperature change on the heat medium conduits 31 and 32 and opens and closes a flow path of the bypass pipe 35; And an absorption chiller (50) which is heated through the first heat exchanger (33) on the bypass pipe (35) and cools through the second heat exchanger (34) on the heat medium conduits (31) (32). It is characterized by comprising.

Accordingly, the present invention has the effect of optimizing the external size of the system based on the principle of the absorption chiller and minimizing the cost of installation or maintenance.

Solar, Absorption, Cooling, Overheating, Heating, Cooling

Description

Overheat protection apparatus for solar heating system {Overheat protection apparatus for solar heating system}

The present invention relates to a solar heating apparatus, and more particularly, to an apparatus for preventing overheating of a solar heating apparatus capable of minimizing the burden of installation or maintenance based on the principle of an absorption type cooler.

In general, solar heating in the renewable energy business has a severe seasonal difference in each region. Especially, winter lacks enough energy to require auxiliary heating (oil boiler, late-night electricity, gas boiler, etc.), and summer uses less energy than consumption. Overheating is a problem. Since solar heaters are installed on the rooftop, the system cannot be forcibly shut down. Therefore, there is an urgent need to solve the technology to prevent overheating in the summer enough to be a problem even in the government installation standards.

Existing overheat protection devices that have been applied or reviewed are firstly radiator system using electric motor fan, secondly forced drainage system, and thirdly using absorption air conditioner.

As an example of the first method, Korean Patent Publication No. 0786938 is provided with a heat exchange means for heating and a hot water exchange means formed with a coil-shaped double tube on the outside of the heat storage tank to maximize heat exchange efficiency and provide water from the water pipe. While preheating the heat in advance, the heat of the refrigerant is taken away to avoid the waste of heat, and to provide a heat dissipation means including a radiator and a cooling fan at the interruption of the refrigerant circulation refrigerant pipe discloses a technology for preventing overheating of the refrigerant during the summer. .

Examples directly or indirectly related to the third method include Korean Utility Model Publication No. 0230604, Korean Patent Registration Publication No. 756240, Korean Patent Application Publication No. 1992-20167, and Korean Utility Model Publication No. 431243. have.

However, according to the first method, installation costs are high and electricity consumption is continuously generated even when solar energy is not used during the summer. In the second method, installation cost is not required, but hot water is forcedly drained according to the proper temperature in the regenerator. Water charges are increased because they make or supplement the water supply. The third method is to perform cooling and overheating by solar heat source based on absorption type air conditioner. The facility is too large and there is still room for improvement.

Literature Information of the Prior Art

[Document 1] Korean Registered Patent Publication No. 0786938 “Solar Boiler”

[Patent 2] Korean Utility Model Registration No. 0167754 "Heater overheat prevention device of solar thermal system boiler"

[Reference 3] Korean Utility Model Registration No. 0230604 “Sorbent absorption air conditioner using solar heat”

Accordingly, the present invention is to fundamentally solve the conventional problems as described above, based on the principle of the absorption chiller while optimizing the external size of the system and can minimize the cost burden of installation or maintenance overheating of the solar heater The object is to provide a prevention device.

In order to achieve the above object, the present invention provides a solar heat radiator storing heat energy collected in a heat collector in a heat storage tank to provide heating and hot water supply: a three-way valve installed in a heat medium conduit between the heat storage tank and the heat collector and intermittent a flow path. Carry bypass tube; A heat exchanger installed on one side of the heat medium conduit and the bypass pipe, respectively; A controller for detecting a temperature change on the heat medium conduit and opening and closing a flow path of the bypass pipe; And an absorption chiller that is heated through a first heat exchanger on the bypass pipe and cools through a second heat exchanger on a heat medium conduit.

At this time, the controller is characterized in that to perform the control based on the temperature of the water temperature sensor of the heat storage tank and the water temperature sensor of the collector.

In addition, the absorption type chiller constitutes a circulation passage with a generator, a separator, a condenser, a vaporizer, and a receiver, and performs a cooling cycle by ammonia / water (NH3 / H2O) or lithium bromide / water (LIBR / H20). It is done.

In addition to the absorption chiller, it characterized in that the auxiliary radiator is provided on the heat medium conduit or the bypass pipe.

On the other hand, the terms or words used in the present specification and claims are not to be construed as limiting the ordinary or dictionary meanings, the inventors should use the concept of the term in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.

As described in the above configuration and operation, the present invention is based on the principle of the absorption chiller while providing the effect of optimizing the external size of the system and minimizing the cost of installation or maintenance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing a solar heating apparatus to which the present invention is applied as a whole, Figure 2 is a diagram showing the piping configuration of the overheat prevention device according to the present invention, Figure 3 is an enlarged diagram of the main piping of the device according to the present invention to be.

The present invention relates to a solar heater that stores heat energy collected by the collector 25 in the heat storage tank 22 to provide heating and hot water supply. The heat energy collected in the collector 25 and accumulated in the heat storage tank 22 through the heat medium heats the water sent from the water supply pipe 16 to the heating pipe 12 and the hot water supply pipe 14. As described above, an absorber-type air conditioner using solar heat is being developed so that the summer collector 25 does not reach an overheated state, but in the case of exchanging all the heat sources generated in the collector 25 for cooling, among the characteristics of the heat exchange system by high temperature heat, In order to prevent the heat exchange efficiency of low temperature heat and the collector 25 from reaching an overheated state, it must be forced to operate regardless of the user's intention, and the size of the scale is required to reduce economic efficiency.

According to the present invention, the bypass pipe 35 is installed in the heat medium conduits 31 and 32 between the heat storage tank 22 and the collector 25 via a three-way valve 36 to control the flow path. The water heated in the collector 25 passes through the heat medium conduit 31 on the upstream side to the heat storage tank 22, and the water cooled in the heat storage tank 22 passes through the heat medium conduit 32 on the downstream side to the collector 25. Circulated. The bypass pipe 35 is provided in the vicinity of the heat collector 25 on the heat medium conduits 31 and 32, and is electrically driven at the portion where the heat medium conduit 31 and the bypass pipe 35 on the upstream side cross each other. Install the three way valve (36). A circulation pump 38 is provided on the downstream heat medium conduit 32.

In addition, according to the present invention, heat exchangers 33 and 34 are installed on one side of the heat medium conduits 31 and 32 and the bypass pipe 35, respectively. The first heat exchanger 33 is installed at the downstream point in the bypass pipe 35, and the second heat exchanger 34 is installed in the vicinity of the collector 25 in the downstream heat medium conduit 32. The heat exchangers 33 and 34 are means for cooling the heat medium of the heat collector 25 by using a heat energy source that is connected to the absorption chiller 50 to be described later and flows through the heat medium conduits 31 and 32.

In addition, according to the present invention, a controller 40 for detecting a temperature change on the heat medium conduits 31 and 32 and opening and closing the flow path of the bypass pipe 35 is provided. The controller 40 controls the operation of the circulation pump 38 or the like in conjunction with the load of the heating pipe 12, the hot water supply pipe 14, and the water supply pipe 16.

At this time, the controller 40 performs control based on the temperature of the water temperature sensor 44 of the heat storage tank 22 and the water temperature sensor 45 of the heat collector 25. When the temperature of the collector 25 is overheated, the heat medium is circulated and cooled by the bypass pipe 35, and when the temperature of the heat storage tank 22 is lowered, the flow path of the bypass pipe 35 is cut again to perform normal operation.

In addition, according to the present invention, the absorption chiller is heated via a first heat exchanger 33 on the bypass pipe 35 and cooled through a second heat exchanger 34 on the heat medium conduits 31 and 32. 50 is provided. The absorption chiller 50 of the present invention should be miniaturized and need to be driven with no power. To this end, the absorption chiller 50 is connected to the first heat exchanger 33 for acquiring driving energy and the second heat exchanger 34 for cooling the heat medium to prevent overheating.

At this time, the absorption chiller 50 is composed of a generator 51, a separator 52, a condenser 54, a vaporizer 55, a receiver 56, the circulation passage, ammonia / water (NH3 / H2O) method Or performing a cooling cycle in a lithium bromide / water (LIBR / H20) mode. First, the generator 51 is connected to the first heat exchanger 33 to perform evaporation of the ammonia solution as a medium, and the separated water sends hydrogen gas to the vaporizer 55 through another flow path, and the separator 52 The ammonia gas and water are separated from the ammonia solution, the condenser 54 causes liquefaction of the ammonia gas, and the vaporizer 55 is connected with the second heat exchanger 34 to produce a mixed gas of ammonia and hydrogen, and the heat medium conduit Heat energy is absorbed from the heat medium of (32), and the receiver 56 performs a cycle of converting the mixed gas back into an ammonia solution. The pipe leading to the water separated in the separator 52 again branches up and down to reach the vaporizer 55 and the receiver 56, respectively. In addition, the lithium bromide / water (LIBR / H20) method also performs the same cycle of evaporation, separation, absorption, and conversion as the ammonia / water (NH 3 / H 2 O) method described above.

As described above, the diffusion type absorption cycle of the present invention is a bubble pump type driven by thermal energy, and thus there is no mechanical driving device, thereby enabling noiseless and vibrationless operation without auxiliary energy (pump or the like).

4 is an enlarged diagram of a main pipe according to the modification of FIG. 3.

As a modification of the present invention, in addition to the absorption type cooler 50, an auxiliary radiator 60 may be provided on the heat medium conduits 31 and 32 or the bypass pipe 35. The auxiliary radiator 60 is installed on the downstream heat medium conduit 32 in the drawing, but can be installed and used on the heat medium conduit 31, 32 or the bypass pipe 35. It may be a method or may be provided with a separate bypass pipe (not shown). The former method is simple in configuration, but cooling is performed unconditionally, and there is a fear of overcooling. The latter method performs cooling of the heat medium as necessary, but the configuration is complicated.

In operation, the three-way valve 36 of the bypass pipe 35 switches the flow path when the water temperature sensor 45 reaches the set value (required temperature of the absorption chiller: 90 ° C. or more) by the solar heat source. By circulating the water cooled by the cold source by the cooler 50 to the collector 25, overheating of the summer solar system can be prevented. If the water temperature sensor 44 of the heat storage tank 22 reaches a temperature below a predetermined value after a predetermined time has elapsed, it is determined that the collector 25 is overcooled and the three-way valve 36 is returned to its original state.

Such an algorithm is stored and performed by the controller 40 and may vary the reference set values of the water temperature sensors 44 and 45.

It is apparent to those skilled in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

1 is a configuration diagram showing a solar heater as a whole to which the present invention is applied,

2 is a diagram showing the piping configuration of the overheat prevention apparatus according to the present invention,

3 is an enlarged diagram of the main piping of the apparatus according to the present invention;

4 is an enlarged diagram of a main pipe according to the modification of FIG. 3.

Explanation of symbols on the main parts of the drawings

20: auxiliary boiler 22: heat storage tank

25: Heat collector 31, 32: Heat pipe

33, 34: heat exchanger 35: bypass tube

36: 3-way valve 40: controller

44, 45: water temperature sensor 50: absorption chiller

51: generator 52: separator

54: condenser 55: vaporizer

56: infusion tank 60: auxiliary radiator

Claims (4)

In a solar heater that stores the heat energy collected by the collector 25 in the heat storage tank 22 to provide heating and hot water supply: A bypass pipe (35) installed in the heat medium conduits (31) and (32) between the heat storage tank (22) and the collector (25) and having a three-way valve (36) to control the flow path; Heat exchangers 33 and 34 respectively installed on one side of the heat medium conduits 31 and 32 and the bypass pipe 35; A controller 40 which detects a temperature change on the heat medium conduits 31 and 32 and opens and closes a flow path of the bypass pipe 35; And An absorption chiller 50 that is heated through the first heat exchanger 33 on the bypass pipe 35 and cools through the second heat exchanger 34 on the heat medium conduits 31 and 32; Overheating prevention device of the solar heater, characterized in that made. The method of claim 1, The controller 40 controls overheating of the solar heater, characterized in that to perform the control based on the temperature of the water temperature sensor 44 of the heat storage tank 22 and the water temperature sensor 45 of the collector 25. The method of claim 1, The absorption chiller 50 comprises a generator 51, a separator 52, a condenser 54, a vaporizer 55, a receiver 56, and constitutes a circulation flow path, and ammonia / water (NH3 / H2O) method or lithium Overheating prevention device of the solar heater, characterized in that for performing the cooling cycle in the bromide / water (LIBR / H20) method. The method of claim 1, In addition to the absorption chiller (50), overheat prevention device for a solar heater, characterized in that it comprises an auxiliary radiator (60) on the heat medium conduit (31) (32) or the bypass pipe (35).

Images