Assembly type double-row-pipe phase change heat storage heating tail end device

Abstract

The invention relates to a heating terminal device, and belongs to the technical field of heating devices. According to the technical scheme, the assembly type double-row-pipe phase change heat storage heating terminal device comprises row pipes arranged in the vertical direction of a wall face, the row pipes are wrapped by heat preservation materials, the number of the row pipes is two, and the row pipes are spirally arranged side by side in a circuitous mode. The phase change heat storage material, the insulating layer, the heat preservation coating, the heat preservation shell, the outer wall and the outer wall heat preservation layer are sequentially arranged on the side, close to the outdoor space, of the heat preservation material from inside to outside. According to the heating terminal device, heat is provided for the indoor space in the daytime, meanwhile, the phase change heat storage material can store the heat, and the stored heat is released when the temperature is low at night, so that the indoor temperature is increased, the energy consumption requirement in building operation is met, and meanwhile the purposes of energy conservation and emission reduction can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heating devices, and in particular relates to an assembled double-row-tube phase-change heat storage heating terminal device. Background Art

[0002] The issue of energy consumption has attracted people's attention. The "China Building Energy Consumption Research Report (2020)" points out that the energy consumption of the whole construction process includes three major parts: energy consumption in the building materials production stage, energy consumption in the building construction stage and energy consumption in the building operation stage. In 2018, the total energy consumption of the whole construction process in the country was 2.147 billion tons of standard coal, accounting for 46.5% of the total national energy consumption. The energy consumption in the building operation stage was 1 billion tons of standard coal, and this part of energy consumption accounted for 21.7% of the total national energy consumption. It can be seen from the above data that building energy consumption accounts for a large proportion of the overall energy consumption. Reducing building energy consumption can effectively reduce my country's overall energy consumption.

[0003] In the operation stage of buildings, not only is the energy consumption large, but also the energy demand is diverse, the energy density is high, the energy demand peak-valley difference is large, the load utilization hours are high, and the energy cost is high. In recent years, with the promotion of the concept of clean energy use and the development of renewable energy generation technology, the number of distributed generation units connected to the building energy system has increased day by day. However, common renewable energy generation such as photovoltaic power generation and wind power generation has very obvious disadvantages, that is, most of them are non-dispatchable power generation units, the power generation is easily affected by the weather, and has strong intermittent and random fluctuations, which are difficult to match with the load demand. In this case, heat storage technology, especially phase change heat storage technology, as a new green and efficient technical means, has attracted more and more attention. Phase change heat storage materials refer to materials that can exchange heat with the external environment and store or release heat during the phase change of materials. They have the advantages of high heat storage density, stable phase change temperature, easy process control, and low cost. In recent years, they have been widely used in the field of building energy conservation. According to different application backgrounds, the characteristics of different energy sources should be fully considered, and the use of different energy sources should be reasonably planned to form a multi-energy complementary building energy system, which can not only meet the energy consumption demand in building operation but also effectively improve the energy saving effect of buildings. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides an assembled double-row tube phase change thermal storage heating terminal device, which effectively meets the energy consumption requirements in building operation and can effectively improve the energy-saving effect of the building.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] Provided is an assembled double-row pipe phase-change thermal storage heating terminal device, comprising rows of pipes arranged in a vertical direction along a wall surface, wherein the rows of pipes are wrapped by a thermal insulation material.

[0007] Furthermore, there are two row pipes, which are arranged side by side.

[0008] Furthermore, a phase change heat storage material is provided on the side of the thermal insulation material close to the outdoors.

[0009] Furthermore, the phase change thermal storage material is provided with an insulating layer, a thermal insulation coating, a thermal insulation shell, an outer wall and an outer wall thermal insulation layer in sequence from the inside to the outside on the side close to the outdoors.

[0010] Furthermore, the thermal insulation layer is a polyethylene foam thermal insulation layer.

[0011] Furthermore, the drain pipe is connected to a water tank, and the water tank is connected to the drain pipe through a circulation pump.

[0012] Furthermore, the water tank is connected to a heating device, and the heating device can be heated by solar energy, wind energy or gas.

[0013] Furthermore, the arrangement of the pipes is in a spiral zigzag arrangement.

[0014] Furthermore, the phase change thermal storage material is paraffin.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The assembled double-row tube phase-change heat storage heating terminal device of the present invention uses clean energy such as solar energy as a heat source. Under the action of the control system, the double-row tube phase-change heat storage is used to heat the indoor space of the building. It effectively balances the fluctuation of indoor temperature by using energy such as solar energy, improves the thermal comfort of the indoor environment, and the entire heating process is completely independent of fossil energy, with a long heating time and low operating cost.

[0017] 2. The assembled double-row pipe phase-change thermal storage heating terminal device in the example of the present invention adopts a double-row pipe thermal storage structure, and the supply and return water temperatures of the two pipes remain consistent. When the auxiliary heat source is sufficient, the pipes on both sides are arranged side by side, and the supply and return water temperatures remain consistent. The outer pipes close to the room mainly radiate heat to the room, and the inner pipes close to the outside store heat in the phase-change thermal storage material. At the same horizontal position, the two rows of pipes have the same temperature, and the outer pipes can reduce the radiation of the inner pipes to the outside when storing heat, thereby improving the thermal storage efficiency;

[0018] 3. The assembled double-row tube phase-change heat storage heating terminal device of the present invention can store the heat supplied by the discontinuous heat source by setting the phase-change heat storage wall. When the heat source supply is reduced or disconnected, the stored heat can be used to supplement and achieve the purpose of continuous supply. The use of phase-change heat storage can store more heat under a certain volume. For example, the heat absorbed after melting 1kg of ice can increase the temperature of the same mass of water, and 80 times the heat will be consumed for every 1°C increase. If "low-cost electricity" is used to store heat in areas with peak and valley electricity prices, operating costs can be saved and economic benefits can be improved. At the same time, if the heat source comes from clean energy, such as solar energy, wind energy, etc., energy can be greatly saved.

[0019] 4. The assembled double-row-tube phase-change heat storage heating terminal device of the present invention is provided with an assembled heat storage wall, which is convenient for installation and maintenance. Since the heat storage wall is installed on the inner side of the outer wall, it can reduce the heat load of the room and achieve energy saving effect.

[0020] 5. The assembled double-row-tube phase-change thermal storage heating terminal device of the present invention adopts a spiral circuitous pipe layout, and its temperature distribution is uniform, with little overall fluctuation, and the near side of the water supply is slightly larger than the far side. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a perspective structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the circuitous pipe arrangement structure of the present invention; Figure 4 This is a schematic diagram of the spiral pipe arrangement structure of the present invention; Figure 5 This is a schematic diagram of the spiral winding pipe arrangement structure of the present invention; Figure 6 This is a schematic diagram of the temperature distribution of the insulation layer after simulation using ANSYS Fluent software; Figure 7 This is a schematic diagram of the temperature distribution of the phase change material layer after simulation using ANSYS Fluent software; Figure 8 This is a schematic diagram of the temperature distribution at the horizontal interface of the double-row pipe water inlet using ANSYS Fluent software.

[0023] In the figure: 1 - external wall insulation layer 2 - external wall 3 - insulation pipe shell 4 - insulation coating 5 - insulation layer 6 - phase change thermal storage material 7 - polyethylene foam insulation layer 8 - pipes 9 - plastering layer. DETAILED DESCRIPTION

[0025] 1. The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0026] 2. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] 3. For the condition of periodic supply of heat source, heat storage is often used to solve the heat supply during the time when there is no heat source supply, and phase change heat storage wall is one of them. This embodiment illustrates the selection of a phase change heat storage wall and a unique pipe layout method-double-row pipe layout, which aims to solve the related problems of heat storage walls under multi-energy complementarity. The multi-energy complementary distributed energy system refers to a "regional energy Internet" system that can accommodate multiple energy resource inputs and has multiple output functions and transportation forms. It is not a simple superposition of multiple energy sources, but a comprehensive and complementary utilization of different energy grades at the system height, and a comprehensive arrangement of the coordination relationship and conversion between various energies to achieve the most reasonable energy utilization effect and benefit. Therefore, the purpose of multi-energy complementarity is to adopt multiple energy sources to complement each other according to different resource conditions and energy users, so as to alleviate the contradiction between energy supply and demand, reasonably protect natural resources, and promote a virtuous cycle of the ecological environment.

[0028] 4. Such as Figure 1 As shown, this embodiment provides an assembled double-row pipe phase-change thermal storage heating terminal device, which is a double-row pipe phase-change thermal storage wall composed of pipes 8 and thermal insulation material 7. It includes two pipes 8 arranged in the vertical direction of the wall, the two pipes 8 are arranged side by side, and the water supply and return temperatures are kept consistent, and the pipes 8 are wrapped by thermal insulation material 7.

[0029] 5. The phase change thermal storage material 6 is provided with an insulating layer 5, a thermal insulation coating 4, a thermal insulation shell 3, an outer wall 2 and an outer wall thermal insulation layer 1 in sequence from the inside to the outside. The row pipe 8 is connected to a water tank, which is connected to the row pipe 8 through a circulation pump. The water tank is connected to a heating device, which is heated by solar energy, wind energy, gas and other heating methods. The heating device transmits the heated heat source to the water tank, and the water tank transmits heat through the circulation pump and the double row pipe 8.

[0030] 6. A double-row pipe 8 heat storage structure is adopted, and the supply and return water temperatures of the two pipes are kept consistent. When the auxiliary heat source is supplied in sufficient quantity, the row pipes 8 on both sides are arranged side by side, and the supply and return water temperatures are kept consistent. The outer row pipe close to the room mainly radiates heat to the room, and the inner row pipe stores heat in the phase change heat storage material 6. At the same horizontal position, the two rows of pipes have the same temperature, and the outer row pipe can reduce the radiation of the inner row pipe to the outside when storing heat, thereby improving the heat storage efficiency. When the auxiliary heat source stops supplying, in order to reduce heat loss, the inner row pipe cuts off the hot water supply, and only supplies hot water to the outer row pipe. At the same time, this can reduce the heat storage of the phase change heat storage material 6 when supplementing heat at night. Considering the indoor construction conditions, the heat storage wall should be set as an assembled type for easy installation and maintenance. Since the heat storage wall is installed on the inner side of the exterior wall 2, it can reduce the heat load of the room by itself and achieve energy-saving effects.

[0031] 7. In this embodiment, the energy storage process of paraffin wax with solar energy as the auxiliary heat source as the phase change heat storage material is as follows: the solar heating system includes a collector. When the collector receives heat energy, it is transmitted to the paraffin wax, and then continuous heating is performed. The heating time is about 5 hours. During this process, the paraffin wax is continuously melted and heat energy is accumulated. After entering the night, the internal solar collector will interrupt the heating and cut off the loop of heat exchange with the outdoor solar energy. At this time, the paraffin wax begins to release the heat accumulated during the day to the room to achieve the heating effect. Generally, the indoor temperature is maintained at 27°C. In the later heat dissipation stage, the paraffin wax will begin to solidify. When the sun rises again the next day, the paraffin wax will begin to reheat, thus continuously circulating this process.

[0032] 8. Further, this embodiment analyzes the arrangement of the pipes in the double-row phase-change thermal storage wall. Figure 3 As shown in the figure, for the circuitous pipe layout, the temperature distribution shows that the temperature is high near the water supply side, while the temperature gradually decreases away from the water supply side, and the temperature gradient is large; Figure 4 As shown in the figure, for the spiral pipe layout, the temperature fluctuates violently at the nearest and farthest ends of the water supply, showing a sudden change between the highest and lowest temperatures, but the temperature in the center of the pipe layout is relatively stable; Figure 5 As shown, for the spiral circuitous pipe arrangement, the temperature distribution is uniform, the overall fluctuation is not large, and the near side of the water supply is slightly larger than the far side. Due to people's yearning for a better life, when doing interior decoration, more and more attention is paid to aesthetics, so the water supply pipe and the return pipe should be laid along the wall, and the distance from the wall should meet the requirements of relevant specifications. In the thermal storage wall, the supply and return water can be set on the lower side, which is convenient for connection with the main pipeline, and the temperature close to the ground is relatively higher, which neutralizes the heat transfer from the ground and makes the room very comfortable; the maximum effective working height of the human body is no more than two meters, so the maximum height of the drainage pipe 8 should be set at about two meters.

[0033] 9. The purpose of the heat storage wall is to store excess heat in the phase change heat storage material 6. The phase change heat storage wall in the present invention uses an inorganic phase change heat storage material paraffin. In order to store heat more effectively, the heating temperature should be uniform, so the spiral circuitous pipe arrangement is preferred. The uniform radiation temperature can also make the human body feel more comfortable.

[0034] 10. The thickness of the phase change thermal storage material was further calculated:

[0035] 11. Assumptions: Take the gas wall-mounted boiler as the main heat source, solar energy as the auxiliary heat source, the building structure (exterior wall length 8743cm, width 5994cm, four rooms indoors), exterior wall height 4m, phase change thermal storage material filling height 2m, thermal storage wall installation area 10m² as an example:

[0036] 12. The average daily heat supply of each 4m² solar auxiliary heat source is 23MJ. The building is equipped with a 16m² solar collector panel, which provides hot water at a temperature that meets the heat storage requirements. The heat storage time is 10 hours a day, and the rest of the time is consumed. The heat storage wall bears 50% of the heat storage. The melting point of paraffin is 47~64 °C, the density is 900kg / m³, and the melting heat is 163.2J·g –1 The total heat load of the building is 1000w, assuming the average load during the day is 500w and the average load at night is 1500w.

[0037] 13. Calories required for 10 hours during the day: Q1=500×3600×10=18MJ;

[0038] 14. Calories required for 14 hours at night: Q2=1500×3600×14=75.6MJ;

[0039] 15. The heat provided by solar panels during the day is: Q t =23×4=92MJ;

[0040] 16. Therefore, the gas wall-mounted boiler can be turned off during the day, and can store up to 92-18=74MJ of heat. The heat storage wall needs to store 74×50%=37MJ of heat;

[0041] 17. The volume of phase change thermal storage material required is: ;

[0042] 18.The thickness of thermal storage wall is: ;

[0043] 19. Obviously, this thickness cannot realize double-row pipe arrangement, so the width of the thermal storage wall should be reduced. Assuming that the installation area of ​​the thermal storage wall is 2m², the thickness of the thermal storage wall is: ;

[0044] 20. Therefore, for this building with four rooms, an area of ​​0.5m 2 (Total area of ​​the four rooms is 2m 2 ), that is, an assembled thermal storage wall with a length of 0.25m, a height of 2m and a thickness of 126mm.

[0045] 21. The ANSYS Fluent software was used to simulate and analyze the assembled double-row tube phase change thermal storage heating terminal device of the present invention. The model is as follows: Figure 2 Assume that the water supply temperature of the solar heat source is 60°C, the water inlet velocity is 0.8m / s, the convection heat transfer coefficient between the insulation layer and the room is 10m / s, and the external radiation heat transfer coefficient is 0.92.

[0046] 22. By simulating the temperature cloud diagram under different h1 lengths, it is concluded that when the double-row tube center distance h1=30mm, the present invention works best. The temperature cloud diagram simulated by ANSYS is as follows: Figure 6~Figure 8 shown.

[0047] 23. In steady state, if Figure 6 As shown, the maximum temperature of the insulation layer close to the indoor side is about 58.42°C, and the minimum temperature is about 33.96°C, which meets the requirement of providing heat to the indoor space.

[0048] 24. In steady state, take the center of the pipe inlet as the reference point to make a horizontal section. The temperature distribution at the phase change material layer is as follows: Figure 7 As shown, the highest temperature is about 53.28°C and the lowest temperature is about 45.74°C, reaching the melting temperature of the phase change material paraffin. The phase change material layer absorbs heat and stores heat.

[0049] 25. In steady state, take the center of the pipe inlet as the reference point to make a horizontal section. The temperature distribution at the insulation layer is as follows: Figure 8 As shown, the highest temperature is about 60℃, the lowest temperature is about 39.32℃, and the temperature distribution is the best.

[0050] 26. Further verification calculations were performed:

[0051] 27. Since the wall heats the indoor air by radiation heat exchange and convection heat exchange, of which radiation heat exchange accounts for a larger proportion, the wall area can be verified by the radiant heat of the radiator.

[0052] 28. Assume that the wall surface temperature is 50°C and the indoor temperature is 18°C. The radiation heat transfer is: Q = 5.67 × 0.92 × 0.252 × (323^ 4 -291^ 4 )×10^ (-6) =4881.7w>1000w.

[0053] 29. In summary, the application of thermal storage walls can reduce the building load, while the phase change thermal storage wall can store more heat; the application of double-row tube thermal storage can make the thermal storage efficiency more efficient, and can efficiently utilize and store heat when the heat source supply cycle is switched.

[0054] 30. For areas with abundant solar energy, it is calculated that for 50m 2 Buildings with solar panels up to 16m 2 , the application of this system can even directly reduce the use of the main heat source. Since the heat provided by solar energy during the day is greater than the daytime load, other heat sources may be needed to supplement the heat only at night, which may be more economical for places with peak and valley electricity prices. However, the initial investment of this system is higher than that of general heating systems, and it is necessary to comprehensively consider the auxiliary heat source to determine whether the investment recovery period is reasonable.

[0055] 31. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An assembled double-row tube phase change thermal storage heating terminal device, characterized in that: The utility model comprises a row of pipes arranged along the vertical direction of the wall surface, wherein the row of pipes are wrapped by a heat-insulating material.

2. The assembled double-row tube phase-change thermal storage heating terminal device according to claim 1 is characterized in that: There are two row pipes, which are arranged side by side.

3. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 1 is characterized in that: A phase-change heat storage material is arranged on one side of the pipe close to the outside of the room.

4. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 3 is characterized in that: The side of the phase-change heat storage material close to the outdoors is provided with an insulation layer, a thermal insulation coating, a thermal insulation shell, an outer wall and an outer wall thermal insulation layer in sequence from the inside to the outside.

5. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 1 is characterized in that: The thermal insulation material is a polyethylene foam thermal insulation layer.

6. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 2 is characterized in that: The drain pipe is connected to a water tank, and the water tank is communicated with the drain pipe through a circulation pump.

7. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 6 is characterized in that: The water tank is connected with a heating device, and the heating device is heated by solar energy, wind energy or gas.

8. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 2 is characterized in that: The pipe arrangement method is a spiral zigzag pipe arrangement method.

9. The assembled double-row-tube phase-change thermal storage heating terminal device according to claim 3 is characterized in that: The phase change heat storage material is paraffin.

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