CN102679434A - Solar phase change heat storage and capillary network radiation heating system - Google Patents

Abstract

The invention belongs to the field of application of heating ventilation air conditioning technologies, relates to an indoor thermal comfort regulating and system energy saving process and particularly relates to a solar phase change heat storage and capillary network radiation heating system. The solar phase change heat storage and capillary network radiation heating system consists of a solar heat collecting module (I), a phase change heat storage module (II), a capillary network radiation heating module (III) and other auxiliary devices, wherein the solar heat collecting module (I) includes a solar heat collector (1); the phase change heat storage module (II) includes a phase change heat storage and release device (2); the capillary network radiation heating module (III) includes a capillary network low-temperature radiation heating network (7); and other auxiliary devices comprise an auxiliary heater box (6), a heat-insulating water storage tank (8), a circulating water pump (9), a pipeline tee joint (10), a pipeline tee joint (14), a pipeline tee joint (15), a cut-off valve (3), a cut-off valve (4), a cut-off valve (5), a cut-off valve (11), a cut-off valve (12), a cut-off valve (13) and the like; and the functions of saving energy and raising the thermal comfort of an indoor environment are achieved by fully utilizing solar resources.

Description

A solar energy phase change heat storage and capillary network radiation heating system

technical field

The invention belongs to the application field of HVAC technology, and relates to indoor thermal comfort adjustment and system energy-saving process, in particular to a solar heat storage and capillary network radiation heating system.

Background technique

Energy shortage and environmental pollution are the primary problems facing human beings in the 21st century. It is considered that the only way out for future social development is to vigorously develop energy-saving and emission-reduction technologies in various fields and to seek clean and renewable energy to replace the increasingly depleted traditional fossil energy. It is one of the technical directions of key development in the medium and long-term scientific and technological development planning outline. This includes two meanings, one is to develop energy-saving technologies and systems for traditional energy sources, and the other is to search for new energy sources and make full use of renewable energy sources. Building energy consumption is an important part of the energy consumption of the whole society, and energy consumption represented by heating and air conditioning accounts for about 50% of the total energy consumption of buildings. Heating equipment not only consumes a large amount of fossil energy such as coal, natural gas, and fuel oil every year, but also produces serious environmental pollution and excessive carbon emissions. The development of building energy-saving technology is very important to reduce the energy consumption of the whole society, reduce carbon emissions and alleviate the pressure of environmental pollution. The means of developing building energy conservation also start from two aspects, one is to develop methods to reduce energy consumption (such as wall insulation, glass insulation, rational building structure, etc.), and the other is to use renewable energy to reduce the consumption of traditional fossil energy (Such as solar energy utilization, ground source heat pump, water source heat pump, air source heat pump, etc.).

The distribution of solar radiation in northern my country is very rich. Taking Xi'an as an example, Xi'an is located at the southern end of the cold region in the thermal division. The average temperature of the coldest month is 0-10°C. The heating period lasts for four months, and the energy consumption for heating accounts for 50% of the energy consumption of the entire building. The daily average total radiation during the heating period can reach 5-10MJ/m ² , and solar energy has important utilization value. However, solar energy is an unstable energy source, which is greatly affected by factors such as seasons, weather, and geography during use, especially at night, and cannot provide sufficient and continuous energy supply. At present, the biggest obstacle to large-scale thermal utilization of solar energy is that the acquisition of solar energy is subject to climatic factors, and it cannot provide stable heating around the clock. Solar heat storage technology uses the phase change heat storage of heat storage materials, which can effectively reduce the volume required for energy storage and realize the full and continuous and stable utilization of solar energy. It is a good way to solve this problem.

Capillary network radiation cooling technology has been gradually applied in high-end residential and public buildings, and will soon become one of the important methods and development directions of cooling in summer, while idle capillary network in winter will also bring many problems and greatly increase the Investment in air conditioning system. The low-temperature radiant heating technology draws on the radiant cooling technology and the floor heating technology, and uses the exposed or concealed plastic material capillary network as the radiation terminal device, relying on the capillary network to provide a large radiative heat transfer area and uniform wall temperature to achieve no blowing Comfortable heating effect. Another notable feature of the capillary network is that the flow rate of the medium in the pipeline is low, and the heat transfer temperature difference between the inlet and outlet is small, generally only 2-4°C. According to my country's heating design standards, the design temperature of indoor heating in winter is 18-20°C. Therefore, the capillary The temperature of the heating medium in the grid can be between 30-35°C, which greatly reduces the requirements for the temperature of the heating medium and provides feasibility for the utilization of low-grade energy.

In view of the above status quo, the present invention proposes a heating system design method that combines the solar heat storage system with the low-temperature radiation heating system at the end of the capillary network. energy to meet all-weather heating requirements; on the other hand, combined with the small heat transfer temperature difference in the low-temperature radiant heating of the capillary network, the energy utilization rate of the entire system is improved.

The patent "capillary network heat pump system using solar energy" (patent application number: 201010509782.3) discloses a capillary network heat pump system using solar energy, which is suitable for central air conditioning systems. The system uses the heat pump system to increase the temperature of water in winter when the climate environment is bad (28-32°C) is transported to the capillary network system, which is easily affected by the climate, and the efficiency of the heat pump unit will be affected in areas with lower ambient temperatures in the north. The patent "solar energy, heat pump and capillary network composite hot water heating and cooling device" (patent application number: 201010611919.6, utility model patent application number: 201020687271.6) discloses a solar energy, heat pump and capillary network composite hot water heating and cooling device. The hot water storage tank is used to store the energy of solar energy. When the temperature of the water tank is insufficient, the water source heat pump is used to increase the temperature of the water tank. This kind of device is sensible heat storage for the storage of solar energy. The large volume of the hot water storage tank will lead to a large system , should not be effectively promoted. The patent "Indoor Geothermal Heating Structure Using Capillary Network and Phase Change Thermal Storage Material" (patent application number: 201110190676.8) discloses an indoor geothermal heating structure using capillary network and phase change thermal storage material. The material and capillary network equipment are laid under the user's floor. The potential hazards caused by laying the phase change heat storage material under the user's floor in this structure are the damage to the user's floor caused by the thermal expansion and contraction of the heat storage material and the maintenance. inconvenient. Patent "An Integrated System of Independent New Energy Building Energy Conservation" (patent application number: 201120081136.1), patent "An energy-saving and comfortable air-conditioning system and its working method" (patent application number: 201110160980.8) and patent "water source heat pump at the end of capillary network Central Air Conditioning System" (patent application number: 201010509781.9, utility model application number: 201020564714.2) have proposed a heating method in which ground source heat pump or water source heat pump system cooperates with solar energy and capillary network system. In the night time period, the heat pump must still be turned on to supplement energy, and the system is more complicated. The patent "A New Type of Ground Source Heat Pump Capillary Roof Air Conditioning System" (patent application number: 200920350744.0) announced a new type of ground source heat pump capillary roof air conditioning system based on solution dehumidification. The system directly uses the ground source heat pump as the heat source without using solar energy This clean energy.

In order to effectively utilize solar energy, a clean energy source, and increase the thermal comfort of the indoor environment, it must be solved from the primary acquisition of energy, the intermediate storage of energy, and the end use of energy.

Contents of the invention

The present invention is designed for the effective use of clean energy such as solar energy, from the primary acquisition of energy, the intermediate storage of energy and the end use of energy. And make full use of the advantages of capillary network low-temperature radiant heating that does not require high heat source temperature, make full use of solar energy resources, realize the functions of saving energy and improving the thermal comfort of the indoor environment.

A solar phase change heat storage and capillary network radiation heating system, the system is composed of a solar heat collection module I, a phase change heat storage module II, a capillary network radiation heating module III and other auxiliary equipment. The solar heat collection module I contains a solar heat collector 1; the phase change heat storage module II contains a phase change heat storage and a phase change radiator 2; the capillary network radiation heating module III contains a capillary network low temperature radiation heating network 7. The other auxiliary equipment includes auxiliary heater box 6, heat preservation water storage tank 8, circulating water pump 9, pipeline tees 10, 14, 15, stop valves 3, 4, 5, 11, 12, 13, etc.

Under the condition of sufficient solar radiation during the day, the system can perform heating and heat storage functions. The switching status of the shut-off valves is: shut-off valves 3, 4, 12, 13 are open, shut-off valves 11, 5 are closed; auxiliary heater 6 is not opened. The specific process is: the hot water at the outlet of the solar collector 1 enters the three-way 15, all the way through the stop valve 4, enters the auxiliary heater 6, and then enters the capillary network low-temperature radiation heating network 7 for low-temperature radiation heat exchange, and then enters the heat preservation water storage tank 8 , then enter the tee 10 after passing through the circulating water pump 9, then enter the shut-off valve 12, and return to the solar heat collector 1 after flowing into the tee 14 to realize the heating function during the day. The other path passes through the cut-off valve 3 and then enters the phase-change heat storage and phase-change radiator 2 for heat storage. After the heat storage is completed, it enters the stop valve 13 and flows into the tee 14, and then returns to the solar collector 1 to realize heat storage. Function.

If heating is not required during the day, when only the heat storage function is performed, the shut-off valves 4 and 12 are closed, and other processes are the same as the above processes.

When heating at night, the shut-off valves 3, 4, 12, 13 are closed, and the shut-off valves 11, 5 are opened. The specific process is: the water from the heat preservation water storage tank 8 enters the tee 10 after passing through the circulating water pump 9, then enters the cut-off valve 11, enters the phase change heat storage and phase change radiator 2 for heat exchange and temperature rise, and then flows through the cut-off valve. The valve 5 enters the auxiliary heater 6, then enters the capillary network low-temperature radiation heating network 7 for heat exchange, and then enters the heat preservation water storage tank 8 to complete the heating function at night.

If the solar radiation condition is not good during the day and the system fails to complete sufficient heat storage, the auxiliary heater 6 is turned on during heating at night to carry out auxiliary heating and heating. Its process is the same as that of heating at night.

Wherein, the phase-change thermal storage and phase-change radiator 2 are evenly distributed in the phase-change thermal storage and phase-change radiator 2 in the way that hot water pipes and cold water pipes are arranged in a staggered manner.

The present invention utilizes the existing mature solar water heater technology, at the temperature of the existing solar heat collector, utilizes the phase change heat storage technology and the low-temperature radiation characteristics of the capillary network to realize the cascade utilization of low-grade heat sources and the secondary distribution of energy, and increase the heat utilization efficiency.

Description of drawings

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are described in further detail:

Fig. 1 is a schematic diagram of the structure of the present invention.

In the figure: 1. Solar heat collector; 2. Phase change radiator; 3, 4, 5, 11, 12, 13, globe valve; 6. Auxiliary heater; 7. Heating network; 8. Insulated water storage tank; 9. Circulating water pump; 10, 14, 15 tees.

Detailed ways

With reference to Fig. 1, principle of the present invention is:

Under the condition of sufficient solar radiation during the day, the system can perform heating and heat storage functions. The switching status of the shut-off valves is: shut-off valves 3, 4, 12, 13 are open, shut-off valves 11, 5 are closed; auxiliary heater 6 is not opened. The specific process is: the hot water at the outlet of the solar collector 1 enters the three-way 15, all the way through the stop valve 4, enters the auxiliary heater 6, and then enters the capillary network low-temperature radiation heating network 7 for low-temperature radiation heat exchange, and then enters the heat preservation water storage tank 8 , then enter the tee 10 after passing through the circulating water pump 9, then enter the shut-off valve 12, and return to the solar heat collector 1 after flowing into the tee 14 to realize the heating function during the day. The other path passes through the cut-off valve 3 and then enters the phase-change heat storage and phase-change radiator 2 for heat storage. After the heat storage is completed, it enters the stop valve 13 and flows into the tee 14, and then returns to the solar collector 1 to realize heat storage. Function.

If heating is not required during the day, when only the heat storage function is performed, the shut-off valves 4 and 12 are closed, and other processes are the same as the above processes.

When heating at night, the shut-off valves 3, 4, 12, 13 are closed, and the shut-off valves 11, 5 are opened. The specific process is: the water from the heat preservation water storage tank 8 enters the tee 10 after passing through the circulating water pump 9, then enters the cut-off valve 11, enters the phase change heat storage and phase change radiator 2 for heat exchange and temperature rise, and then flows through the cut-off valve. The valve 5 enters the auxiliary heater 6, then enters the capillary network low-temperature radiation heating network 7 for heat exchange, and then enters the heat preservation water storage tank 8 to complete the heating function at night.

If the solar radiation condition is not good during the day and the system fails to complete sufficient heat storage, the auxiliary heater 6 is turned on during heating at night to carry out auxiliary heating and heating. Its process is the same as that of heating at night.

Among them, the phase-change heat storage and phase-change heat radiator 2 are evenly distributed in the phase-change heat storage and phase-change heat radiator 2 in a way of staggered arrangement of hot water pipes and cold water pipes, in order to improve heat exchange efficiency.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the method and technical content disclosed above to make some changes or modifications to equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (2)

1. A solar phase change heat storage and capillary network radiant heating system, characterized in that: the system consists of a solar heat collection module (I), a phase change heat storage module (II), a capillary network radiant heating module (III) and other Auxiliary equipment; the solar heat collection module (I) contains a solar heat collector (1); the phase change heat storage module (II) contains a phase change heat storage and a phase change radiator (2); the capillary The network radiant heating module (III) contains a capillary network low-temperature radiant heating network (7); the other auxiliary equipment includes an auxiliary heater box (6), an insulated water storage tank (8), a circulating water pump (9), and a pipeline tee ( 10), (14), (15), globe valves (3), (4), (5), (11), (12), (13), etc.; Under the condition of sufficient solar radiation during the day, the system can perform heating and heat storage functions. The switching status of the shut-off valves is as follows: shut-off valves (3), (4), (12), and (13) are open, shut-off valves (11), (5 ) is closed; the auxiliary heater (6) is not opened; the specific process is: the hot water at the outlet of the solar collector (1) enters the tee (15), and all the way through the stop valve (4) enters the auxiliary heater (6), Then enter the capillary network low-temperature radiation heating network (7) for low-temperature radiation heat exchange, enter the thermal insulation storage tank (8), then pass through the circulating water pump (9) and enter the tee (10), then enter the stop valve (12), and flow into the three After passing through (14), it returns to the solar collector (1) to realize the heating function during the day; all the way through the shut-off valve (3), it enters the phase change heat storage and phase change radiator (2) for heat storage to complete the heat storage After heating, it enters the cut-off valve (13) and flows into the tee (14), and then returns to the solar collector (1) to realize the heat storage function; If heating is not required during the day and only heat storage is performed, the shut-off valves (4) and (12) are closed, and other processes are the same as the above processes; When heating at night, the shut-off valves (3), (4), (12), and (13) are closed, and the shut-off valves (11), (5) are opened; the specific process is: the water from the insulated water storage tank (8) is circulated The water pump (9) enters the tee (10), then enters the stop valve (11), enters the phase change heat storage and phase change heat radiator (2) for heat exchange and temperature rise, and then flows through the stop valve (5) into the auxiliary Heater (6), then enters the capillary network low-temperature radiation heating network (7) for heat exchange, and then enters the heat preservation water storage tank (8) to complete the heating function at night; If the solar radiation condition is not good during the day and the system fails to complete sufficient heat storage, the auxiliary heater (6) is turned on for auxiliary heating during night heating; the process is the same as that of night heating. 2. A solar energy phase change heat storage and capillary network radiant heating system according to claim 1, characterized in that: phase change heat storage and phase change heat radiator (2) adopt hot water pipes and cold water pipes staggered The mode is evenly distributed in the phase change heat storage and phase change radiator (2).

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