CN210399118U

CN210399118U - Novel warm braw heating system who combines solar energy

Info

Publication number: CN210399118U
Application number: CN201920689549.4U
Authority: CN
Inventors: 刘�东; 刘豪; 王杰
Original assignee: Southwest University of Science and Technology
Current assignee: Southwest University of Science and Technology
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-04-24
Anticipated expiration: 2029-05-15

Abstract

The utility model relates to a novel combine warm braw heating system of solar energy. It is characterized in that the system: circulating water preheated by the solar heat collector (1) enters the auxiliary heater (2) to be reheated, and then is sent into the heat exchanger (4) by the water pump (3) to be subjected to heat exchange and then returns to the solar heat collector to complete circulation. Air blown by the fan (5) exchanges heat with the heat exchanger (4) and then enters the air duct below the floor, part of heat of the hot air is transferred to the structural layer (7) and the phase change heat storage material (8) through the heat conducting fins (6) in the flowing process of the air duct, and the other part of heat is directly brought into the room through the air outlet (9) on the ground. The utility model discloses combined warm braw and ground heat accumulation technique, both realized preheating fast to the room, realized a large amount of storages of energy again to reach the purpose of utilizing solar energy more high-efficiently.

Description

Novel warm braw heating system who combines solar energy

Technical Field

The invention relates to a heating system, in particular to a novel solar-energy-combined warm air heating system.

Background

With the rapid development of economy in China, the living standard of people is continuously improved, the living conditions are improved, meanwhile, the building energy consumption is rapidly increased, and the proportion of the building energy consumption to the energy consumption of the whole society is about 30%, so that the tension situation of energy supply is aggravated. In building energy consumption, the energy for heating accounts for about 45 percent, and the energy-saving heat-supply device is a key field of building energy conservation. In order to reduce building energy consumption, both energy saving and source opening are needed, so related scientific researchers in China are working on expanding the application range of renewable energy sources in buildings. Solar energy is an inexhaustible clean energy and one of important energy sources which can be relied on by human beings for a long time, and the solar heat energy is utilized to supply heat to buildings so as to obtain very good energy-saving and environmental benefits, and the solar energy is always paid attention to by countries in the world for a long time. In more than ten years, the technology of large-scale utilization of solar heat supply and heating in developed countries in Europe and North America is rapidly developed, a large number of regional heat supply and heating projects utilizing solar energy are built, and corresponding technical guides and design manuals are compiled and published. Solar energy in many cold regions in China is very abundant, and in order to fully utilize the natural energy, the technical specifications of solar heating and heating engineering (GB 50495-2009) are jointly issued by the Ministry of construction and national quality supervision, inspection and quarantine of China in 3 months and 19 days in 2009 and are implemented in 8 months and 1 day in 2009.

Solar energy is an unstable heat source and can be affected by cloudy, rainy, and snowy weather. The supply of solar energy varies both quantitatively and temporally. The solar energy can be obtained only in the daytime, particularly in direct sunshine, and can be obtained only in sunny days, and the energy in life is concentrated in the morning and at night compared with the daytime. If the solar energy can be stored temporarily and recycled when necessary, the convenience of energy can be improved, and the application range can be expanded. Therefore, the invention adopts heat storage measures to transfer the solar heat in the daytime to the heating at night. If the heat supply quantity changes and exceeds the capacity of the heat storage device, or the heat supply temperature is lower than the requirement of the user terminal, an auxiliary heat source can be arranged for supplement. In winter, the heat collection efficiency and the heat collection temperature are easy to decrease compared with summer, so that a large-scale solar heat utilization system generally adopts a boiler or a heat pump as an auxiliary heat source.

At present, in the regions of northwest Sichuan, Tibet, Xinjiang and the like in China, the temperature difference between day and night is very large, the solar radiation intensity is high in the daytime, and the temperature is lower at night. In order to utilize solar energy more reasonably, researches on plateau heating are more and more. The combined solar heating mode adopted in the current stage mostly utilizes a water tank heat storage mode to meet the requirement of heating at night. For example, the public publication No. CN201910091235 provides a heating scheme using a water tank for heat storage, but during heating at night, a certain amount of traditional energy is often consumed for maintaining the water temperature in a certain interval, and power is also required for conveying circulating water, so that zero-energy-consumption heating at night cannot be really realized, and if the system is used in an alpine region, the risk of water circulation stagnation and even pipe burst caused by water freezing due to insufficient heat preservation measures also exists. Also, for example, CN201720323159 uses a water tank to store heat, and feeds hot water to a coil pipe of each room to heat in the form of hot air, but this type of heat storage heating system also has a risk of freezing water, and cannot realize zero-energy-consumption heating at night. In order to better provide a heating strategy for alpine regions, people are actively exploring a heating method for building structure heat storage to replace the traditional water tank heat storage mode. For example, publication No. CN201510524099 provides a heating strategy for wall heat storage, which utilizes a heat source to supply heat and a wall heat storage mode to heat rooms at night, and can realize zero-energy consumption heating at night. However, as paraffin is used as a phase change heat storage material for the wall, the invention often faces the technical obstacles of material sealing and the difficulty of construction in practical application, and cannot realize rapid preheating of the room.

The solar air heat collector heating system has the advantages that the solar air heat collector heating system has higher heating efficiency than a solar hot water heating system, and a lot of people also research the application of solar energy in the aspect of air preheating. For example, publication No. CN201811491947 provides a solar heating device for heating air by using solar energy and heating circulating water by the air to achieve the purpose of heating indoor space. However, the system cannot realize a heat storage function and is limited by the icing of water, and the system is difficult to apply to extremely cold regions. Publication number CN201811394630 discloses a heat storage device which utilizes a vacuum tube heat collector to heat air and then sends the air into a room and heat storage equipment, so that solar energy is effectively utilized, and a heat storage function is realized. However, the system has multiple heat exchange when the accumulated heat is utilized, so that the heat exchange efficiency is reduced, the complexity of the system is increased, the initial investment is increased, the operation of power equipment such as a fan and the like is still required in the heat taking link, zero-energy-consumption heating at night is not really realized, and in addition, because the solar energy has uncertainty of distribution in time and space, and the system does not combine the traditional energy as an auxiliary means, the system cannot achieve an ideal heating effect in a long-term rainy weather period.

Disclosure of Invention

Aiming at the problems, the invention designs a novel warm air heating system combining solar energy.

The system has the operation thought that: in daytime, circulating water preheated by the solar heat collector (1) enters the auxiliary heater (2) to be reheated, and then is sent into the heat exchanger (4) by the water pump (3) to be subjected to heat exchange and then returns to the solar heat collector to complete circulation. Air blown by the fan (5) exchanges heat with the heat exchanger (4) and then enters the air duct below the floor, part of heat of the hot air is transferred to the structural layer (7) and the phase change heat storage material (8) through the heat conducting fins (6) in the flowing process of the air duct, and the other part of heat is directly brought into the room through the air outlet (9) on the ground. At night, the operation of the whole system can be stopped, and the heat stored by the phase change heat storage material in the daytime is used for continuously heating the room. Further, if no solar energy is available for a long time (for example, in rainy days for a long time), the auxiliary heater (2) can be independently operated to bypass the solar heat collecting equipment, and the operation flow of the system is consistent with the normal condition. The invention combines the warm air and ground heat storage technologies, not only realizes the quick preheating of the room, but also realizes the mass storage of energy, thereby achieving the purpose of more efficient utilization of solar energy.

The solar heat collector is a vacuum solar heat collecting pipe or a solar heat collecting plate.

The inlet of the solar heat collector is connected with the heat exchanger through a pipeline, and the outlet of the solar heat collector is connected with the auxiliary heater through a pipeline.

And the surface of the pipeline is paved with a heat-insulating material.

Wherein, the auxiliary heater be gas hanging stove or electric water heater.

The auxiliary heater can be filled with tap water or underground water.

Wherein, the pipeline that coils in the heat exchanger inside be copper pipeline. On which copper or aluminium fins are arranged.

Wherein, the heat conducting strip is a copper sheet.

Wherein, the surface of the structural layer is provided with a bulge for supporting.

Wherein, the upper half section of the heat conducting plate is sequentially inserted into the structural layer and the phase change heat storage material from bottom to top

The invention has the advantages that: 1. the phase change heat storage material filled in the floor layer is used for storing heat in hot air in the daytime, so that the problem that solar heating cannot be performed at night is solved, complementation of solar heating and phase change heat storage heating modes is realized, timeliness of solar heating is prolonged to the maximum extent, and the purpose of zero-energy consumption heating at night can be achieved; 2. the room air is preheated by adopting a warm air downward-feeding mode, so that the problem of head and foot heating caused by the traditional fan coil heating mode is solved; 3. the system has simple structure, does not need to be provided with a large heat storage water tank or other heat storage devices, saves investment and has wide applicable range; 4. the use of circulating water pipe that significantly reduces can effectively prevent because the low temperature causes the hydrologic cycle stagnation that the water freezes and arouses, the danger that the water pipe bursts even, improves and has prolonged system life.

Drawings

Fig. 1 is a schematic elevation view of a novel solar-integrated warm air heating system according to an embodiment of the present invention.

In the figure: 1, a solar heat collector; 2 an auxiliary heater; 3, a water pump; 4, a heat exchanger; 5, a fan; 6 heat conducting fins; 7, structural layers; 8 phase change heat storage material; 9 ground air outlet.

Fig. 2 is a schematic plan view of a novel solar-integrated warm air heating system according to an embodiment of the present invention.

In the figure: 1, a solar heat collector; 2 an auxiliary heater; 3, a water pump; 4, a heat exchanger; 5, a fan; 9 ground air outlet. 10 a building support structure.

Detailed Description

The invention is further illustrated, but not limited, by the following examples and figures.

The system is a novel warm air heating system combined with solar energy and designed and invented aiming at the climate characteristics of cold climate and long low-temperature weather period in plateau areas. In daytime, circulating water preheated by the solar heat collector (1) enters the auxiliary heater (2) to be reheated, and then is sent into the heat exchanger (4) by the water pump (3) to be subjected to heat exchange and then returns to the solar heat collector to complete circulation. Air blown by the fan (5) exchanges heat with the heat exchanger (4) and then enters the air duct below the floor, part of heat of the hot air is transferred to the structural layer (7) and the phase change heat storage material (8) through the heat conducting fins (6) in the flowing process of the air duct, and the other part of heat is directly brought into the room through the air outlet (9) on the ground. At night, circulating water can be drained to prevent the water body from freezing, the operation of the whole system is stopped, and heat stored by the phase change heat storage material in the daytime is used for continuously supplying heat to rooms. Further, if no solar energy is available for a long time (for example, in rainy days for a long time), the auxiliary heater (2) can be independently operated in the daytime and the solar heat collecting equipment can be bypassed, and the operation flow of the system is consistent with the normal condition. The invention combines the warm air and ground heat storage technologies, not only realizes the quick preheating of the room, but also realizes the mass storage of energy, thereby achieving the purpose of more efficient utilization of solar energy.

Further, the circulating water may be not only tap water but also well water or underground water with a relatively high temperature.

Furthermore, if the system is used for a large building, the auxiliary heater (1) can be changed into a large boiler or a heat pump, and the inlet air can be full fresh air or partial fresh air.

Furthermore, the filling amount of the phase-change heat storage material is determined according to the room load, and the heat storage amount (45-15 ℃) of the phase-change material is 278MJ/m high-speed plantation, which is equivalent to 75-degree power consumption.

Further, if the room has a high requirement on the air preheating speed, graphene can be added into the phase change heat storage material, and the mass ratio of the paraffin to the mass ratio of 80-mesh expanded graphite to the mass ratio of graphene is as follows: 94%, 5% and 1%.

Furthermore, if the system is applied to a room space with a small space, a full-return-air mode can be adopted for heating.

Furthermore, the floor heating coil pipe can be coiled in a shape of a circle, a double-circle shape and a snake shape, and the specific coiling mode is determined by the room space characteristics.

Furthermore, if the system is applied to the regions with insufficient solar energy resources, the solar heat collector in the system can be removed, and the wall-mounted furnace or electric heating can be directly used for storing heat on the ground and preheating air in the daytime.

Furthermore, if the system is applied to the areas with low electricity price, the system can heat the room by using low-price electric heating circulating water at night and simultaneously store heat for the heat storage material, and the system does not need to consume electricity for heating when the electricity price is recovered to a high level in the daytime.

Furthermore, if the system is applied to areas which are cold in winter and hot in summer and rich in solar energy resources, such as Xinjiang, Gansu and other provinces, a heat-preservation water tank needs to be added, the water tank can be bypassed in winter to operate according to the mode applied to plateau areas, the ground heating circulation unit can be bypassed when the temperature is higher in summer, and hot water generated by solar energy can be stored in the heat-preservation water tank and used as domestic water.

Furthermore, the high latent heat composite phase change heat storage material used by the system can be applied to ground heat storage, and can also be applied to systems of wall heat storage, roof heat storage and water tank type heat storage.

The present invention will be described in detail with reference to specific examples. For example, when the system is applied to ordinary residential houses in plateau areas, if the houses are short flat houses, the solar heat collector can be arranged on the roof, the pipe sections exposed to the outside are reduced as much as possible, sufficient heat preservation measures must be carried out on the pipe sections exposed to the outside, and a small gas wall-mounted furnace or an electric water heater can be arranged indoors and connected with the solar heat collector to serve as an auxiliary heat source. The heat of the thermal circulating water in daytime is released into the air to the maximum extent through the heat exchanger, one part of warm air is used for instant heating in the underground air duct, and the other part of warm air is stored in the structural layer and the phase change heat storage material through the heat conducting sheet. And at night, the system stops running, and the heat stored by the floor heating system continues to supply heat to the indoor space. If the house is a building, the application of the system is relatively limited. But still usable for partly sunny dwellings. Compared with the main application of the system, the solar energy heat collecting system has the main difference that the heat collector needs to use a solar energy vacuum heat collecting pipe, and the heat collecting pipe can be arranged at the position of an outdoor unit of the air conditioner to replace the traditional shutter, so that the appearance is attractive, and the solar energy can be efficiently utilized.

As another example, the system is applied to a large public building in an plateau area, such as a train station hall. Because like the roofing space such as station, airport terminal building big, can install solar collector at the roofing, the solar collector in this system is preferred with selecting plate collector this moment, and auxiliary heater can use large-scale boiler or air source heat pump, and plate collector also can pin the heat in public space when the thermal-arrest, and hot water lets in the floor below, with partly heat release, another part heat storage, also can be indoor continuous high-efficient heating night under the condition that does not have energy resource consumption.

The foregoing is merely exemplary of the preferred embodiments of the present invention, and details which have not been set forth are within the ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent changes, such as changes in the proportion of the phase change heat storage material, changes in the heat collection area of the solar heat collector, etc., based on the technical teaching of the present invention are also within the protection scope of the present invention.

Claims

1. A new type of warm air heating system combined with solar energy, characterized in that the system: after the circulating water preheated by the solar collector (1) enters the auxiliary heater (2) for reheating, the water pump (3) will It is sent to the heat exchanger (4) for heat exchange and then returned to the solar collector to complete the cycle; the air blown by the fan (5) exchanges heat with the heat exchanger (4) and enters the air below the floor. In the duct, the hot air transfers part of the heat to the structural layer (7) and the phase change heat storage material (8) through the heat conducting sheet (6) during the flow of the air duct, and another part of the heat is directly passed by the air through the ground air outlet (9). ) into the room.

2 . A new type of warm air heating system combined with solar energy according to claim 1 , wherein the solar collector is a vacuum solar collector tube or a solar collector plate. 3 .

3 . The new type of warm air heating system combined with solar energy according to claim 1 , wherein the auxiliary heater is a gas wall-hung boiler or an electric water heater. 4 .

4. A new type of warm air heating system combined with solar energy according to claim 1, characterized in that, the pipes coiled inside the heat exchanger are copper pipes, and copper or aluminum fins are arranged on them. .

5 . The new type of warm air heating system combined with solar energy according to claim 1 , wherein the heat-conducting sheet is a copper sheet. 6 .

6 . The new type of solar heating combined with solar energy according to claim 1 , wherein the surface of the structural layer has protrusions for supporting. 7 .

7 . The new type of warm air heating system combined with solar energy according to claim 1 , wherein the upper half of the thermally conductive sheet is inserted into the structural layer and the phase-change heat storage material in order from bottom to top. 8 . .