CN109084394B - Fresh air preheating device - Google Patents
Fresh air preheating device Download PDFInfo
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- CN109084394B CN109084394B CN201810961618.2A CN201810961618A CN109084394B CN 109084394 B CN109084394 B CN 109084394B CN 201810961618 A CN201810961618 A CN 201810961618A CN 109084394 B CN109084394 B CN 109084394B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000011229 interlayer Substances 0.000 claims abstract description 33
- 239000012782 phase change material Substances 0.000 claims abstract description 27
- 239000010410 layer Substances 0.000 claims abstract description 6
- 210000001503 joint Anatomy 0.000 claims abstract description 4
- 239000012188 paraffin wax Substances 0.000 claims description 27
- 238000004378 air conditioning Methods 0.000 claims description 12
- 238000005338 heat storage Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- -1 meanwhile Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
- F24F5/0021—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice using phase change material [PCM] for storage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a fresh air preheating device, which comprises a fresh air pipe, a solar flat plate heat collecting unit and a heat accumulating and releasing unit, wherein the solar flat plate heat collecting unit comprises a solar flat plate heat collector, a water supply pipe and a water return pipe, and the water supply pipe and the water return pipe are respectively connected with a water outlet and a water inlet of the solar flat plate heat collector; the heat accumulating and releasing unit comprises an air pipe and a heat exchanger, wherein the air pipe is of a double-layer pipe structure which is formed by concentric inner pipes and outer pipes and is provided with an annular interlayer, the heat exchanger is arranged in the annular interlayer, the annular interlayer is filled with phase change materials to cover the heat exchanger, and two ends of the annular interlayer are sealed to seal the phase change materials in the annular interlayer; two ends of the air pipe inner pipe are in butt joint with two sections of fresh air pipes; the water supply pipe is connected with the water inlet end of the heat exchanger, and the water return pipe is connected with the water outlet end of the heat exchanger. The device of the invention preheats fresh air by utilizing solar energy, has simple structure, stable work, energy conservation, environmental protection and low cost.
Description
Technical Field
The invention relates to a solar energy utilization and preheating device, in particular to a fresh air preheating device.
Background
Energy conservation and environmental protection are the subjects of the current world, and are closely related to human development. With the continuous decrease of fossil energy sources of the earth, the development and utilization of new energy sources have become the focus of worldwide attention. Solar energy is a clean and sustainable resource, so that many countries begin to utilize solar energy resources to generate electricity, heat, cool, preheat fresh air and the like, thereby relieving energy crisis and protecting environment.
The cold water is heated by the solar energy through the flat plate collector and is directly used for preheating fresh air, and although energy is saved, the solar energy has instability in different times and weather for the area with barren solar energy, and the received radiation amount is small, so the characteristic can limit the use of the solar energy in an air conditioning system. Therefore, in order to ensure the normal operation of the air conditioning system in winter, an electric heater is often adopted or a fresh air unit is used for heating fresh air, and the outdoor temperature is low, so that the energy consumption of the fresh air is seriously increased, and the risk of freezing a heat exchange coil is also caused.
The electric heater is a device for heating air by passing current through a resistance wire to generate heat, and is divided into a bare wire type and a tube type. The electric heater has the advantages of compact structure, uniform heating, stable heat, convenient control and the like. However, the electric heater utilizes high-grade energy to heat outdoor air, which is unfavorable for energy conservation and is only suitable for a part of air conditioning units and small-sized air conditioning systems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the fresh air preheating device which has the advantages of simple structure, stable work, low cost and energy conservation.
The technical scheme of the invention is realized as follows:
the fresh air preheating device comprises a fresh air pipe, a solar flat plate heat collecting unit and a heat accumulating and releasing unit, wherein the solar flat plate heat collecting unit comprises a solar flat plate heat collector, a water supply pipe and a water return pipe, and the water supply pipe and the water return pipe are respectively connected with a water outlet and a water inlet of the solar flat plate heat collector; the heat accumulating and releasing unit comprises an air pipe and a heat exchanger, wherein the air pipe is of a double-layer pipe structure which is formed by concentric inner pipes and outer pipes and is provided with an annular interlayer, the heat exchanger is arranged in the annular interlayer, the annular interlayer is filled with phase change materials to cover the heat exchanger, and two ends of the annular interlayer are sealed to seal the phase change materials in the annular interlayer; the two ends of the inner pipe of the air pipe are in butt joint with the two sections of fresh air pipes so that fresh air entering through one section of fresh air pipe enters into the other section of fresh air pipe after being preheated by the air pipe and finally enters into an air conditioning system; the water supply pipe is connected with the water inlet end of the heat exchanger, and the water return pipe is connected with the water outlet end of the heat exchanger.
Further, the heat exchanger is a spiral coil type heat exchanger and is arranged in the annular interlayer in a mode of being sleeved on the outer wall of the inner tube, so that liquid in the heat exchanger and the phase change material can exchange heat uniformly and fully.
Further, the cross section of any part of the inner surface and the outer surface of the inner tube is of a sawtooth structure, and the convex teeth of the sawtooth structure at any part of the inner surface correspond to tooth grooves between two convex teeth of the sawtooth structure of the outer surface, so that the phase change material is convenient to fill the convex teeth, and the heat exchange area with fresh air is increased.
Further, a pipeline with a cross-shaped cross section is arranged in the inner cavity of the inner pipe along the length direction, the length of the cross-shaped pipeline is consistent with that of the inner pipe, the front end and the rear end of the cross-shaped pipeline are both closed, four sides corresponding to the cross-shaped vertexes of the cross-shaped pipeline are connected with the inner pipe and are communicated with the annular interlayer, and phase change materials can conveniently enter the cross-shaped pipeline to enlarge the heat exchange area with fresh air.
Further, the outer surface of the outer tube of the heat accumulating and releasing unit and two ends of the annular interlayer are coated with heat insulation materials, so that heat in the heat accumulating and releasing unit is prevented from being dissipated outwards.
Further, the phase change material is paraffin.
Further, the solar flat plate collector is a square flat plate, a water inlet is arranged at one corner of the lower end of the solar flat plate collector and is connected with the water return pipe, and a water outlet is arranged at the opposite corner of the upper end of the solar flat plate collector and is connected with the water supply pipe.
Further, electric gate valves are arranged on the water return pipe and the water supply pipe and used for controlling the flow of water in the pipeline.
Further, the switch of the electric gate valve is controlled by a temperature sensor arranged in the annular interlayer and used for sensing the temperature of the phase change material, and when the temperature sensor detects that the temperature of the phase change material is higher than the set temperature, the electric gate valve is closed, and heat accumulation is completed.
And when the electric gate valve is in a closed state, the water return pump is powered off to stop working.
Compared with the prior art, the invention has the following beneficial effects:
1. the air pipe of the heat storage and release unit of the device is of a double-layer pipe structure, and compared with other structures, the heat exchange area of fresh air and phase change materials is larger; the cross section of the inner surface and the outer surface of the inner pipe are of sawtooth structures, the convex teeth of the sawtooth structures at any positions of the inner surface correspond to tooth grooves between two convex teeth of the outer surface sawtooth structures, meanwhile, a cross-shaped pipeline is arranged in the inner cavity of the inner pipe along the length direction, the length of the cross-shaped pipeline is consistent with that of the inner pipe, the front end and the rear end of the cross-shaped pipeline are all closed, four sides corresponding to the cross-shaped vertexes of the cross-shaped pipeline are connected with the inner pipe and are communicated with the annular interlayer, phase change materials are filled in the convex teeth and the cross-shaped pipeline, when outdoor fresh air is in contact with the inner surface of the air pipe, the heat exchange area of the fresh air and the phase change materials is further increased, the heat exchange efficiency is improved, and the effect of fully preheating the fresh air is achieved.
2. The invention takes paraffin with the melting point of about 20 ℃ as the phase change material, and the paraffin is a low-temperature phase change material, and the low-temperature phase change material has the advantages of high phase change latent heat, no supercooling and precipitation phenomenon, small phase change temperature and phase change latent heat change after heat absorption for many times, no toxicity, low price and the like. In winter in the area of solar energy impoverishment, the solar energy received is little and unstable, and the cold water can only be heated to 40 ℃ at most by utilizing the solar energy, so that the paraffin with low melting point is selected for heat storage in order to fully utilize the low-temperature hot water, and the purpose of stably preheating fresh air is achieved through the heat release of the paraffin.
3. The heat exchanger of the device is a spiral coil type heat exchanger, and the heat exchanger can be used for uniformly and fully exchanging heat between liquid in the heat exchanger and paraffin, so that the overall heat exchange efficiency between the paraffin and water is improved, and heat is fully stored in the paraffin.
4. The outer surface of the outer tube of the air pipe and the two ends of the annular interlayer are coated with heat insulation materials, so that heat in the heat storage and release unit is prevented from being dissipated outwards.
5. The device adopts solar energy as heat collecting energy, is clean, environment-friendly and sustainable, has no regional limitation, can be used even in solar barren areas, and has wide application region.
Drawings
Fig. 1-the main construction of the device according to the invention is schematically shown.
FIG. 2 is a schematic diagram of a low temperature phase change thermal storage and release unit according to the present invention.
FIG. 3-a schematic cross-sectional view of a low temperature phase change thermal storage and release unit of the present invention.
Wherein 1-fresh air; 2-a new air pipe; 3-a low temperature phase change heat storage and release unit; 4-solar flat plate collector; 5-a water supply pipe; 6-a water return pipe; 7-an electric gate valve on the water return pipe; 8-an electric gate valve on the water supply pipe; 9-an inner tube; 10-an outer tube; 11-spiral coil type heat exchanger; 12-paraffin; 13-a water return pump; 14-convex teeth; 15-cross-shaped pipeline.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1, 2 and 3, a fresh air preheating device comprises two sections of fresh air pipes 2, a low-temperature phase-change heat accumulating and releasing unit 3, a solar flat-plate heat collector 4, a water supply pipe 5 and a water return pipe 6, wherein the water supply pipe 5 and the water return pipe 6 are respectively connected with a water outlet and a water inlet of the solar flat-plate heat collector 4; the low-temperature phase-change heat storage and release unit 3 comprises an air pipe and a spiral coil pipe heat exchanger 11, wherein the air pipe is of a double-layer pipe structure with an annular interlayer, the double-layer pipe structure is formed by an inner pipe 9 and an outer pipe 10 which are concentric, the spiral coil pipe heat exchanger 11 is arranged in the annular interlayer, paraffin 12 is filled in the annular interlayer to cover the spiral coil pipe heat exchanger 11, and two ends of the annular interlayer are sealed to seal phase-change materials in the annular interlayer; two ends of the air pipe inner pipe 9 are in butt joint with the two sections of fresh air pipes 2 so that fresh air 1 entering through one section of fresh air pipe 2 enters the other section of fresh air pipe 2 after being preheated by an air pipe and finally enters an air conditioning system; the water supply pipe 5 is connected with the water inlet end of the spiral coil pipe type heat exchanger 11, and the water return pipe 6 is connected with the water outlet end of the spiral coil pipe type heat exchanger 11.
The spiral coil type heat exchanger 11 is arranged in the annular interlayer in a mode of being sleeved on the outer wall of the inner tube 9, so that the liquid in the heat exchanger can exchange heat with the paraffin 12 uniformly and fully,
the solar flat plate collector 4 is a square flat plate, a water inlet is arranged at one corner of the lower end of the solar flat plate collector 4 and is connected with the water return pipe 6, and a water outlet is arranged at the opposite corner of the upper end of the solar flat plate collector 4 and is connected with the water supply pipe 5.
The return pipe 6 and the water supply pipe 5 are respectively provided with a return pipe electric gate valve 7 and a water supply pipe electric gate valve 8, when paraffin 12 is completely melted, a temperature sensor arranged in the low-temperature phase-change heat storage and release unit 3 is used for detecting the temperature of the paraffin 12, when the temperature is higher than a preset value (the preset value can ensure that the paraffin is completely melted), the return pipe electric gate valves 7 and 8 are closed, meanwhile, a return pump 13 arranged on the return pipe 6 is powered off to stop working, water in a pipeline stops flowing, and a fresh air preheating device completes heat storage.
In order to increase the preheating area contacted with the fresh air 1 entering the fresh air pipe 2, the cross section of any position of the inner surface and the outer surface of the inner pipe 9 of the low-temperature phase-change heat accumulating and releasing unit 3 is of a sawtooth structure, the convex teeth 14 of the sawtooth structure at any position of the inner surface correspond to tooth grooves between the two convex teeth 14 of the sawtooth structure of the outer surface, and the phase-change material is filled in the tooth grooves of the outer surface of the inner pipe. Meanwhile, a pipeline with a cross-shaped cross section is arranged in the inner cavity of the inner pipe 9 along the length direction, the length of the cross-shaped pipeline 15 is consistent with that of the inner pipe 9, the front end and the rear end of the cross-shaped pipeline are both closed, the cross-shaped pipeline 15 is connected with the inner pipe 9 through four sides corresponding to the cross-shaped vertexes and is communicated with the annular interlayer, and paraffin enters the cross-shaped pipeline to exchange heat with fresh air. And in order to prevent heat in the heat accumulating and releasing unit 3 from being dissipated outwards, the outer surface of the outer tube 10 of the heat accumulating and releasing unit 3 and two ends of the annular interlayer are coated with heat insulating materials. The inner tube 9 is made of copper sheet with better heat conductivity, and the outer tube 10 is made of PVC sheet.
In order to prevent the long-term use and loss of the circulating water for heat exchange in the fresh air preheating device, a water inlet pipe and a switch for controlling water inlet are further arranged on the water return pipe 6, so that the circulating water can be conveniently supplemented in real time.
When the sun is sufficient, the solar flat plate collector 4 absorbs enough, the circulating hot water cannot timely exchange heat with the paraffin 12, the generated gas can cause the air pressure in the circulating system to rise, and a safety air valve is arranged on the water supply pipe for exhausting in consideration of safety.
For a better understanding of the device according to the invention, the working principle of the device according to the invention will now be described in detail:
when the weather is clear, the air conditioning system is in a stop running state, the electric gate valve is started, solar energy is absorbed by the solar flat plate collector, cold water is heated to hot water, the hot water flows into the spiral coil type heat exchanger through the water supply pipe to exchange heat with paraffin, the paraffin absorbs heat of the hot water and melts into liquid, the heat is stored in the paraffin, and the temperature of the hot water is reduced to cold water and flows into the solar flat plate collector through the water return pipe. The whole process is repeatedly circulated until the paraffin is completely melted, at the moment, the electric gate valve is closed when the sensor detects that the liquid paraffin reaches a certain temperature, the water pump is powered off to stop working, water in the whole pipeline stops flowing, and heat accumulation is completed.
When the indoor temperature is reduced during the night or overcast and rainy days in winter, the air conditioning system is started to supply heat to the indoor, and at the moment, the outdoor fresh air is preheated because the outdoor temperature is too low. At this time, paraffin exchanges heat with outdoor fresh air flowing into the inner pipe from the fresh air pipe, paraffin releases heat and solidifies, stored heat is transferred to the outdoor fresh air through the inner pipe, the convex teeth arranged on the inner surface layer of the inner pipe and the cross-shaped pipeline, the preheating fresh air is achieved, and then the preheating fresh air is discharged from the fresh air pipe and enters an air conditioning system to finally supply heat to the indoor.
When solar radiation exists outdoors in daytime, solar energy is stored in paraffin again, so that fresh air can be preheated at night or in overcast and rainy days.
When the weather is clear, if the indoor and outdoor temperatures are low, the air conditioning system can be started to supply heat to the indoor and preheat the outdoor fresh air. At the moment, the electric gate valve is opened, solar energy is absorbed by the solar energy flat plate collector, cold water is heated into hot water, the hot water flows into the spiral coil type heat exchanger through the water supply pipe to exchange heat with paraffin, meanwhile, paraffin exchanges heat with outdoor fresh air flowing into the inner pipe from the new air pipe, heat of the paraffin is transferred to the outdoor fresh air through the convex teeth and the cross-shaped pipeline arranged on the inner surface layer of the inner pipe and the inner surface layer of the inner pipe, the fresh air is preheated, and then the preheated fresh air is discharged from the new air pipe to enter the air conditioning system to supply heat indoors.
The device is particularly suitable for winter in solar energy barren areas, and the device utilizes solar energy to preheat fresh air, has the advantages of simple structure, stable work, energy conservation, environmental protection, low cost, wide application area and obvious economic and social benefits.
Finally, it should be noted that the above-mentioned examples of the present invention are only illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. Not all embodiments are exhaustive. Obvious changes and modifications which are extended by the technical proposal of the invention are still within the protection scope of the invention.
Claims (9)
1. The fresh air preheating device comprises a fresh air pipe, a solar flat plate heat collecting unit and a heat accumulating and releasing unit, and is characterized in that the solar flat plate heat collecting unit comprises a solar flat plate heat collector, a water supply pipe and a water return pipe, and the water supply pipe and the water return pipe are respectively connected with a water outlet and a water inlet of the solar flat plate heat collector; the heat accumulating and releasing unit comprises an air pipe and a heat exchanger, wherein the air pipe is of a double-layer pipe structure which is formed by concentric inner pipes and outer pipes and is provided with an annular interlayer, the heat exchanger is arranged in the annular interlayer, the annular interlayer is filled with phase change materials to cover the heat exchanger, and two ends of the annular interlayer are sealed to seal the phase change materials in the annular interlayer; the two ends of the inner pipe of the air pipe are in butt joint with the two sections of fresh air pipes so that fresh air entering through one section of fresh air pipe enters into the other section of fresh air pipe after being preheated by the air pipe and finally enters into an air conditioning system; the water supply pipe is connected with the water inlet end of the heat exchanger, and the water return pipe is connected with the water outlet end of the heat exchanger;
the melting point of the phase change material is 20 ℃, a pipeline with a cross-shaped cross section is arranged in the inner cavity of the inner pipe along the length direction, the length of the cross-shaped pipeline is consistent with that of the inner pipe, the front end and the rear end of the cross-shaped pipeline are both closed, the cross-shaped pipeline is connected with the inner pipe through four sides corresponding to the cross-shaped vertexes and is communicated with the annular interlayer, and the phase change material can conveniently enter the cross-shaped pipeline to enlarge the heat exchange area with fresh air.
2. The fresh air preheating device according to claim 1, wherein the heat exchanger is a spiral coil type heat exchanger, and is arranged in the annular interlayer in a manner of being sleeved on the outer wall of the inner tube, so that the liquid in the heat exchanger and the phase change material can exchange heat uniformly and fully.
3. The fresh air preheating device according to claim 1, wherein the cross section of any part of the inner surface and the outer surface of the inner tube is of a sawtooth structure, and the convex teeth of the sawtooth structure at any part of the inner surface correspond to tooth grooves between two convex teeth of the sawtooth structure on the outer surface, so that the phase change material is convenient to fill the convex teeth, and the heat exchange area with fresh air is increased.
4. The fresh air preheating device according to claim 1, wherein the outer surface of the outer tube of the heat storage and release unit and two ends of the annular interlayer are coated with heat insulation materials, so that heat in the heat storage and release unit is prevented from being dissipated outwards.
5. The fresh air preheating device according to claim 1, wherein the phase change material is paraffin.
6. The fresh air preheating device according to claim 1, wherein the solar flat-plate collector is a square flat plate, a water inlet is arranged at one corner of the lower end of the solar flat-plate collector and is connected with the water return pipe, and a water outlet is arranged at the opposite corner of the upper end of the solar flat-plate collector and is connected with the water supply pipe.
7. A fresh air preheating device according to claim 1 or 6, wherein the return pipe and the water supply pipe are provided with electric gate valves for controlling the flow of water in the pipes.
8. The fresh air preheating device according to claim 7, wherein the switch of the electric gate valve is controlled by a temperature sensor arranged in the annular interlayer for sensing the temperature of the phase change material, and when the temperature sensor detects that the temperature of the phase change material is higher than the set temperature, the electric gate valve is closed, and the heat storage is completed.
9. The fresh air preheating device according to claim 7, wherein a water return pump is arranged on the water return pipe and used for lifting the low-temperature water pump after heat exchange of the heat exchanger to the solar flat plate collector for heating, and when the electric gate valve is in a closed state, the water return pump is powered off to stop working.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810961618.2A CN109084394B (en) | 2018-08-22 | 2018-08-22 | Fresh air preheating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810961618.2A CN109084394B (en) | 2018-08-22 | 2018-08-22 | Fresh air preheating device |
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| Publication Number | Publication Date |
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| CN109084394A CN109084394A (en) | 2018-12-25 |
| CN109084394B true CN109084394B (en) | 2023-11-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109894286B (en) * | 2019-02-21 | 2019-12-24 | 中国矿业大学 | Particle mineral dry separation system based on solar energy and heat storage |
| CN111649416B (en) * | 2020-05-20 | 2021-11-02 | 扬州大学 | Cold and hot preliminary treatment phase change energy storage new trend system |
| CN113669783A (en) * | 2021-08-31 | 2021-11-19 | 东莞理工学院 | Novel phase change heat storage unit and design method thereof |
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