CN110332597A - Passive solar two-stage phase change heat storage heating device - Google Patents

Abstract

The invention discloses a passive solar energy dual-stage phase change heat storage heating device, which is composed of a solar heat collector (1) and a radiator (2), and the solar heat collector (1) is realized by a bracket (7) Installation, solar heat collector (1) and radiator (2) link to each other by water supply pipe (11) and return water pipe (12); It is characterized in that, the water supply pipe (11) in the upper half of described radiator (2) High melting point phase change material (9) is filled outside, and low melting point phase change material (10) is filled outside the return water pipe (12) in the lower half of the radiator (2). Compared with the prior art, the heating device of the present invention absorbs solar energy through the solar collector in the daytime, stores excess heat in the phase change material for heating, and releases heat at night to heat the room, while maintaining a constant day and night room temperature, improving Improve the utilization efficiency of solar energy, solve the problem of intermittent and unstable solar energy, and achieve the purpose of fully and comprehensively utilizing solar energy.

Description

Passive solar two-stage phase change heat storage heating device

technical field

The invention relates to a heating device, in particular to a passive solar energy heating device with two-stage phase-change energy storage.

Background technique

At present, in rural areas of our country, coal is generally used for heating in winter, which not only causes a large amount of primary energy consumption, but also has serious environmental pollution problems. Solar energy is the most common renewable and clean energy. It can be used as a heat source in heating systems, which can reduce the consumption of primary energy and is conducive to the development of low-carbon buildings and green buildings. Therefore, in order to respond to energy saving and emission reduction and realize clean heating, passive solar heating technology has great development potential.

Phase change energy storage technology has the advantages of large energy storage, small temperature fluctuation, limited indoor space occupation, and stable performance. Combining energy storage technology with solar heating is an important way to solve the intermittency and instability of solar energy. Phase change materials absorb solar radiant heat during the day, store it in the form of latent heat, and release it for building use at night, thereby increasing the temperature level at night and ensuring the reliability of heating.

When phase change energy storage technology is used in passive heating of buildings, phase change materials are often combined with enclosure structures to achieve the effect of peak shaving and valley filling and indoor temperature fluctuation, but the utilization rate of solar energy is low and the heating effect is limited .

At present, solar heating systems are divided into active and passive systems in terms of heat collection. Among them, the passive system is mostly solar-air system, which has a relatively simple structure and low investment, but the utilization efficiency of solar radiant heat is low. The heat capacity is low, and the heating capacity is limited.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a passive solar dual-stage phase-change heat storage heating device, which can maintain a stable room temperature day and night without consuming additional energy, save energy and reduce emissions, and improve solar energy utilization efficiency the goal of.

A passive solar dual-stage phase-change heat storage heating device of the present invention, the device is composed of a solar heat collector 1 and a radiator 2, the solar heat collector 1 is installed through a bracket 7, and the solar heat collector 1 and heat dissipation The device 2 is connected to the water return pipe 12 through the water supply pipe 11; the water supply pipe 11 located in the upper half of the radiator 2 is filled with a high melting point phase change material 9, and the return water pipe 12 located in the lower half of the radiator 2 is filled with low Melting point phase change material 10.

The outdoor pipes of the water supply pipe 11 and the water return pipe 12 are pasted with electric heating cables 5 and covered with insulation layers 6 .

The phase change temperature of the high-melting point phase-change material 9 is 50°C-60°C, the phase-change temperature of the low-melting point phase-change material 10 is 25°C-35°C, and the phase change material is selected from paraffin wax, fatty acid, stearic acid , sodium acetate trihydrate, palmitic acid, stearyl alcohol in one or more.

Circular fins are installed on the inner tube wall of the radiator 2 to enhance heat exchange.

A set of solar heat collectors 1 can optionally be connected to multiple radiators.

A check valve 3 is installed on the water supply pipe 11 to prevent night hot water from flowing backwards, and a shut-off valve 4 is installed on the water return pipe 12 to control the flow of water through the valve according to the indoor temperature.

Compared with the prior art, the present invention has the following advantages:

1. The device absorbs solar energy through the solar collector during the day, stores excess heat in the phase change material while heating, and releases heat at night to heat the room. While maintaining a constant room temperature day and night, it improves the utilization efficiency of solar energy and solves the problem of Solved the intermittent and unstable problems of solar energy, and achieved the purpose of fully and comprehensively utilizing solar energy;

2. Low operating cost.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a passive solar dual-stage phase-change heat storage heating device of the present invention;

Fig. 2 is the schematic diagram of radiator structure;

Reference signs:

1. Solar heat collector, 2. Radiator, 3. Check valve, 4. Globe valve, 5. Electric heating cable, 6. Insulation layer, 7. Bracket, 8. External wall, 9. High melting point phase change material , 10, low melting point phase change material, 11, water supply pipe, 12, return water pipe.

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 2, the structure of the passive solar dual-stage phase-change heat storage heating device of the present invention includes a solar heat collector 1 and a radiator 2, and the solar heat collector 1 is installed on the outer wall through a bracket 7 at a certain angle, The water supply pipe 11 located in the upper half of the radiator 2 is filled with a high melting point phase change material 9 , and the water return pipe 12 located in the lower half of the radiator 2 is filled with a low melting point phase change material 10 . The solar heat collector 1 and the radiator 2 are connected through a water supply/return pipe. The water supply pipe is equipped with a check valve 3 to prevent the hot water from flowing backward at night. The return pipe is equipped with a stop valve 4 to control the water flow according to the indoor temperature. The outdoor pipeline part of the water supply pipe and the water return pipe is pasted with an electric heating cable 5 and covered with an insulation layer 6. When the outdoor temperature is lower than 0°C, the electric heating cable 5 is turned on to prevent the pipeline from freezing.

The device does not have too many restrictions on the climate and has strong adaptability. The valve can be adjusted according to different climates to keep the indoor temperature within a certain range without being too cold or overheated. The heating effect is better in areas with sufficient solar energy.

in:

The phase transition temperature of the high melting point phase change material 9 is 50°C to 60°C, and the phase transition temperature of the low melting point phase change material 10 is 25°C to 35°C. The phase change material is selected from paraffin, fatty acid, stearic acid, three One or more of sodium acetate hydrate, palmitic acid, stearyl alcohol. According to the different temperature of the supply and return water, two phase change materials with different phase change temperatures can be used to fully collect the heat of the supply and return water and improve the utilization rate of solar energy.

The solar heat collector 1 is arranged facing south from the north, and the included angle with the horizontal plane is consistent with the latitude of the geographical location, so as to improve the heat collection efficiency of the solar heat collector.

Circular fins are arranged on the inner tube wall of the radiator 2 to enhance heat exchange.

Depending on the indoor heat load, a set of solar collectors can be connected to multiple radiators.

Working process of the present invention is as follows:

Energy storage working condition: water absorbs solar energy in the solar collector 1, the temperature rises, the volume expands, and the density decreases, so it enters the radiator 2 along the water supply pipe through the check valve 3, and first stores the heat of the high-temperature water supply at the high melting point In the phase change material 9, heating is provided to the room at the same time. After the water temperature drops, the heat of the low temperature return water is further stored in the low melting point phase change material 10, and the return water enters the solar heat collector 1 for heating.

Energy release condition: the high-melting-point phase-change material 9 first releases heat to the water flow in the pipe through heat conduction, and heats the room through heat convection and heat radiation. When the heat stored in the high-melting-point phase-change material 9 is exhausted and the water temperature drops further , the low-melting point phase-change material 10 releases heat and continues to provide heat for the room.

The check valve 3 is used to prevent the water heated by the phase change material from flowing back to the solar collector 1 due to the density, causing heat loss. The stop valve 4 is used to adjust the water flow according to the indoor temperature. Under the energy storage condition, when the room temperature rises, the valve can be gradually closed to reduce the flow rate, and when the room temperature is lowered, the valve can be gradually opened to increase the flow rate; under the energy release condition, it can be closed The valve prevents heat loss caused by heat exchange between hot water and cold water on side 1 of the solar collector.

Claims (6)

1. A passive solar dual-stage phase-change heat storage heating device, the device is made up of a solar heat collector (1) and a radiator (2), and the solar heat collector (1) is installed by a support (7), The solar heat collector (1) and the radiator (2) are connected through a water supply pipe (11) and a return pipe (12); it is characterized in that the water supply pipe (11) located at the upper half of the radiator (2) is filled The high melting point phase change material (9), the return pipe (12) located in the lower half of the radiator (2) is filled with low melting point phase change material (10). 2. A passive solar dual-stage phase-change heat storage heating device as claimed in claim 1, characterized in that, the outdoor pipeline parts of the water supply pipe (11) and the water return pipe (12) are pasted with electric heating cables ( 5), and the outer covering insulation layer (6). 3. A passive solar dual-stage phase change heat storage heating device according to claim 1, characterized in that, the phase change temperature of the high melting point phase change material (9) is 50°C-60°C, and the low The phase change temperature of the melting point phase change material (10) is 25°C to 35°C, and the phase change material is selected from one or more of paraffin wax, fatty acid, stearic acid, sodium acetate trihydrate, hexadecanoic acid, and stearyl alcohol kind. 4. A passive solar dual-stage phase-change heat storage heating device as claimed in claim 1, characterized in that circular fins are installed on the inner tube wall of the radiator (2) to enhance heat exchange. 5. A passive solar dual-stage phase-change heat storage heating device as claimed in claim 1, characterized in that a set of solar heat collectors (1) can be selectively connected to multiple radiators. 6. A passive solar dual-stage phase-change heat storage heating device as claimed in claim 1, characterized in that, the water supply pipe (11) is equipped with a check valve (3) to prevent backflow of hot water at night; A shut-off valve (4) is housed on the water return pipe (12), and the water flow situation is controlled through the valve according to the indoor temperature.