CN105020834A - Fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain - Google Patents
Fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain Download PDFInfo
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- CN105020834A CN105020834A CN201510473900.2A CN201510473900A CN105020834A CN 105020834 A CN105020834 A CN 105020834A CN 201510473900 A CN201510473900 A CN 201510473900A CN 105020834 A CN105020834 A CN 105020834A
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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
- F24F9/00—Use of air currents for screening, e.g. air curtains
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain. Fresh air permeation is blocked and building heating/air conditioning loads are reduced through the vertically-upward air curtain. In winter, 1, horizontal side returned air and vertical top supplied air are formed in front of an outer window on the ground, the indoor returned air siphon circulation is unblocked, and the indoor temperature uniformity is improved; 2, the circulating air volume is increased, and the supplied air/returned air temperature difference is reduced; and 3, the ground coldest returned air is heated. The condensing temperature is reduced and the heating capacity and the energy efficiency ratio of a heat pump are increased jointly. In summer, the ground coldest returned air is cooled, and returned air cooling loads are reduced. Returned air circulation is formed through the small air volume, and the air conditioning operating loads are reduced; and therefore, efficient terminal forms of heating and an air conditioning are unified.
Description
(1) technical field
The present invention relates to a kind of fluorine coil pipe driving side air draught top air-out variable air rate air curtain vertically upward.
(2) background technology
The end of existing heating, air-conditioning mainly contains following several prods form:
1, underground pipe heating: owing to passing through accumulation of heat and the heat radiation on floor, reduce condensation temperature and improve heat pump heating capacity and Energy Efficiency Ratio; But its defect is as follows: material cost and the installation cost of (1) underground pipe are higher; (2) product palpus Assembling, during the supply of material in enormous quantities, product quality is difficult to guarantee; (3) underground pipe maintenance difficult; (4) also need to set up wall indoor unit for realizing air conditioning function, thus between two kinds of ends switchover operation, this on the one hand causes freon working medium hydrops, affects product reliability; Two kinds of ends also improve product cost on the other hand.
2, split-type air conditioner, multi-connected air conditioner: for realizing the return air dehumidifying of summer air-conditioning, its indoor set is just cooled to the indoor return air of 27 DEG C in the large temperature difference mode of little air quantity 12 DEG C of below dew point; But when this used for indoor machine in winter heating time face again following predicament: (1) air-supply/return air temperature difference corresponding compared with partial circulating air quantity is larger, cause condensation temperature higher, reduce heat pump heating capacity and Energy Efficiency Ratio, be difficult to the heating application requirement independently meeting northern frore area; (2) wall indoor unit and ceiling embedded type indoor set: owing to being all from roof return air, and top air-supply, therefore return air after the thermally stratified layer of circulating-heating indoor top all the time; This just improves condensation temperature on the one hand, reduces heat pump heating capacity and Energy Efficiency Ratio; Cause lower air temperature on the low side on the other hand, reduce heating effect; (3) cabinet-type indoor set: due to bottom return air, middle part horizontal blast, therefore circulating-heating bottom return air all the time, improve heating effect.
3, radiator: can form thermal current vertically upward before exterior window, to stop Air Infiltration, to form the siphon heat cycles of room air to improve room temperature uniformity, to improve heating effect.
4, idle call cooling air curtain vertically downward: stop hot blast infiltration, reduce building air conditioning refrigeration duty; But owing to being form air curtain vertically downward, the effect therefore for heating operation is just not ideal enough.
(3) summary of the invention
The present invention seeks to want integrated heating underground pipe, cabinet-type indoor set, radiator, idle call existing various heating, the air conditioning terminal technical advantage such as cooling air curtain vertically downward, improve its weak point, the efficient Terminal device of unified heating and air-conditioning, improves heat pump heating capacity and Energy Efficiency Ratio by reducing condensation temperature; The fluorine coil pipe driving side air draught top air-out variable air rate air curtain vertically upward providing a kind of technology simple and direct, with low cost, reliable.
The present invention adopts technical scheme, namely fluorine coil pipe driving side air draught top air-out variable air rate vertically upward air curtain as shown in Figure 1, it is by 1-louvered side return air inlet; 2-screen pack; 3-fin fluorine coil pipe; 4-variable air rate blower fan; 5-flow-guiding type end face air outlet; 6-check-valves; 7-expansion valve; 7-1-filter; 8-water accumulating disc; 9-drainpipe; 10-shell; 11-silencing cotton; The compositions such as 12-humidifier, is characterized in that:
Louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, variable air rate blower fan 4, flow-guiding type end face air outlet 5, composition return air regulating loop;
The fluorine gas pipe be connected in series, fin fluorine coil pipe 3, fluorine liquid pipe and check-valves 6 thereof are connected with filter 7-1 the parallel component of expansion valve 7, and wherein the flow direction of check-valves 6 deviates from connected fin fluorine coil pipe 3, composition freon heat pump fluid loop;
Fin fluorine coil pipe 3 vertical immediately below the water accumulating disc 8 of level is set, drainpipe 9 is set bottom water accumulating disc 8, composition condensed water outlet loop;
Louvered side return air inlet 1 is arranged on shell 10 indoor, flow-guiding type end face air outlet 5 be arranged on shell 10 end face, fluorine liquid pipe and fluorine gas interface tube be arranged on shell 10 body of wall side, drainpipe 9 outlet be arranged on shell 10 bottom surface, composition shell 10 use port;
Shell 10 inwall completely pastes silencing cotton 11.
Between variable air rate blower fan 4 to flow-guiding type end face air outlet 5, humidifier 12 is set.
Screen pack 2 is PM2.5 filter screen.
Operation principle of the present invention 1 is described as follows by reference to the accompanying drawings:
1, freon condensation heating heating in winter return air: the driven compressor high pressure of heat pump cycle, overheated gaseous fluorine Leon working medium, flow through fin fluorine coil pipe 3 working medium side, after release exhaust sensible heat, condensation latent heat, excessively cold sensible heat, become high pressure, supercooled liquid freon working medium, flow out through check-valves 6, form gas-gas heat pump cycle, so that air evaporator is gathered surrounding air Lowlevel thermal energy, circulating pump is disposed in the room air of 18 DEG C to fin fluorine coil pipe 3; Variable air rate blower fan 4 drives return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, humidifier 12, flow-guiding type end face air outlet 5 with comparatively systemic circulation air quantity, the coldest 18 DEG C of return air in ground are heated to wind pushing temperature 25 DEG C also humidification in the little temperature difference mode of Wind Volume 7 DEG C, form warm air curtain vertically upward and stop Air Infiltration, reduce building and heating thermic load; Before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon heat cycles, improve room temperature uniformity; Noise is reduced when the silencing cotton 11 that shell 10 inwall completely pastes is for increasing air circulation in the winter time; By reducing condensation temperature 6 DEG C of raising heat pump heating capacities and Energy Efficiency Ratio, thus realize effective warming function in winter.
2, summer freon Evaporative Cooling Air Conditioning return air: the high pressure of kind of refrigeration cycle, supercooled liquid freon working medium, through filter 7-1 in expansion valve 7 after throttling, flow through fin fluorine coil pipe 3 working medium side, absorb 27 DEG C of room air Lowlevel thermal energies, and evaporation becomes low pressure, overheated gaseous fluorine Leon working medium, attracted by compressor and flow out, forming gas-gas kind of refrigeration cycle, room air Lowlevel thermal energy circulating pump is discharged in surrounding air to aerial condenser; Variable air rate blower fan 4 drives return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, flow-guiding type end face air outlet 5 with comparatively partial circulating air quantity, cool in the large temperature difference mode of little air quantity 14 DEG C, the coldest 26 DEG C of return air in ground of dehumidifying to wind pushing temperature 12 DEG C, both reduced return air cooling load; Simultaneously also by the infiltration of the hot blast of cooling air curtain stop vertically upward, reduce building air conditioning refrigeration duty; Before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon cool cycles, improve room temperature uniformity; The condensed water that in dehumidification process, fin fluorine coil pipe 3 outer surface is formed, then is continued to discharge shell 10 downwards by drainpipe 9 first to downstream in water accumulating disc 8 according to gravity; Thus realize high-efficiency air-condition function in summer.
3, freon evaporative cooling heating in winter return air realizes defrosting: the high pressure of kind of refrigeration cycle, supercooled liquid freon working medium, through filter 7-1 in expansion valve 7 after throttling, flow through fin fluorine coil pipe 3 working medium side, absorb 18 DEG C of room air Lowlevel thermal energies, and evaporation becomes low pressure, overheated gaseous fluorine Leon working medium, attracted by compressor and flow out, forming gas-gas kind of refrigeration cycle, with the room air Lowlevel thermal energy that fin fluorine coil pipe 3 is gathered, circulating pump is defrosting to aerial condenser; Variable air rate blower fan 4 drives return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, flow-guiding type end face air outlet 5 with comparatively systemic circulation air quantity, the coldest 18 DEG C of return air in ground are cooled to wind pushing temperature 11 DEG C, to absorb return air heat in the little temperature difference mode of Wind Volume 7 DEG C; And by the Air Infiltration of cooling air curtain stop vertically upward, reduce building and heating thermic load; Before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon cool cycles, improve room temperature uniformity; Thus realize efficient defrosting function in winter.
Compared with existing various forms of heating, air conditioning terminal product, the present invention unifies the efficient Terminal device of heating and air-conditioning, reduces heat pump condensation temperature; Its technical advantage is as follows:
(1) stop Air Infiltration winter by air curtain vertically upward, reduce building and heating thermic load; Stop that hot blast permeates summer, reduce building air conditioning refrigeration duty;
(2) pass through exterior window front formation horizontal side return air and vertical top on the ground to blow, thus with minimal flow resistance, the siphon circulation of unimpeded indoor return air, improves room temperature uniformity, by reducing condensation temperature raising heat pump heating capacity and Energy Efficiency Ratio;
(3) by increasing air circulation winter, reducing the air-supply/return air temperature difference, reducing condensation temperature and improving heat pump heating capacity and Energy Efficiency Ratio;
(4) heating the coldest return air in ground winter, improving heat pump heating capacity and Energy Efficiency Ratio by reducing condensation temperature; Cool the coldest return air in ground summer, reduce return air cooling load;
(5) the return air siphon circulation formed with little air quantity summer, avoids the most hot-air in cooling top, reduces operation of air conditioner load;
(6) unify the efficient Terminal device of heating and air-conditioning, exempt underground pipe, reduce material cost, manufacturing cost, installation cost, the maintenance cost of product, guarantee product quality; Avoid two kinds of ends to switch and cause freon hydrops, improve product reliability.
By air curtain vertically upward, the present invention stops that new wind permeates, reduce building and heating/air conditioner load; Winter is blown by formation horizontal side return air and vertical top before (1) on the ground exterior window, with the siphon circulation of the unimpeded indoor return air of minimal flow resistance, improves room temperature uniformity; (2) increase air circulation, reduce the air-supply/return air temperature difference; (3) the coldest return air in ground is heated; Common reduction condensation temperature improves heat pump heating capacity and Energy Efficiency Ratio; Cool the coldest return air in ground summer, reduce return air cooling load; The return air siphon circulation simultaneously formed with little air quantity, avoids the most hot-air in cooling top, reduces operation of air conditioner load; Unify the efficient Terminal device of heating and air-conditioning, exempt underground pipe, reduce product cost, guarantee product quality, improve product reliability.
(4) accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention.
(5) detailed description of the invention
The fluorine coil pipe driving side air draught top air-out variable air rate that the present invention proposes vertically upward air curtain embodiment as shown in Figure 1, be now described as follows, it is by the louvered side return air inlet 1 of: Opening length 1280mm, height 450mm; The PM2.5 screen pack 2 of Opening length 1280mm, height 450mm; Length 1340mm, height 600mm, thickness 35mm, 2 row diameter 6.35mm red copper pipe box ripples window high-efficiency aluminum fin fluorine coil pipe 3; Air quantity is the variable air rate blower fan 4 of 7-22m3/min, blast 90Pa; The flow-guiding type end face air outlet 5 of Opening length 1280mm, width 195mm; The check-valves 6 of interface diameter 6.35mm; The expansion valve 7 of interface diameter 6.35mm; The filter 7-1 of interface diameter 6.35mm; The water accumulating disc 8 of Opening length 1370mm, width 220mm, degree of depth 50mm; The drainpipe 9 of interface diameter 20mm; The shell 10 of length 1380mm, height 615mm, thickness 230mm; The PE silencing cotton 11 of thickness 15mm; The composition such as wet-membrane humidifier 12 grade of thickness 60mm, is characterized in that: louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, variable air rate blower fan 4, flow-guiding type end face air outlet 5, composition return air regulating loop; The fluorine gas pipe be connected in series, fin fluorine coil pipe 3, fluorine liquid pipe and check-valves 6 thereof are connected with filter 7-1 the parallel component of expansion valve 7, and wherein the flow direction of check-valves 6 deviates from connected fin fluorine coil pipe 3, composition freon heat pump fluid loop; Fin fluorine coil pipe 3 vertical immediately below the water accumulating disc 8 of level is set, drainpipe 9 is set bottom water accumulating disc 8, composition condensed water outlet loop; Louvered side return air inlet 1 is arranged on shell 10 indoor, flow-guiding type end face air outlet 5 be arranged on shell 10 end face, fluorine liquid pipe and fluorine gas interface tube be arranged on shell 10 body of wall side, drainpipe 9 outlet be arranged on shell 10 bottom surface, composition shell 10 use port; Shell 10 inwall completely pastes silencing cotton 11.Between variable air rate blower fan 4 to flow-guiding type end face air outlet 5, humidifier 12 is set.Screen pack 2 is PM2.5 filter screen.
During embodiment of the present invention heat pump cycle 1 in winter, the compressor of volume flow 5.3m3/h, drive high pressure, overheated gaseous fluorine Leon working medium, flow through fin fluorine coil pipe 3 working medium side, release exhaust sensible heat under 30 DEG C of saturation temperatures, condensation latent heat, cross in the room air of cold sensible heat to 18 DEG C, become high pressure, supercooled liquid freon working medium, flow out through check-valves 6, enter throttling in expansion valve, flow through air evaporator working medium side again, absorb-20 DEG C of surrounding air Lowlevel thermal energies and evaporate and become low pressure, overheated gaseous fluorine Leon working medium, attracted by compressor, form gas-gas heat pump cycle, variable air rate blower fan 4 is with the comparatively systemic circulation air quantity of 21.78m3/min, drive return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, humidifier 12, flow-guiding type end face air outlet 5, the coldest 18 DEG C of return air in ground are heated to wind pushing temperature 22 DEG C also humidification in the little temperature difference mode of Wind Volume 4 DEG C, form warm air curtain vertically upward and stop Air Infiltration, reduce building and heating thermic load 100W, before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon heat cycles, improve room temperature uniformity, noise is reduced to 33dB (A) when the silencing cotton 11 that indoor set shell 10 inwall completely pastes is for increasing air circulation in the winter time, heat pump heating capacity is 2.50kW, by reducing condensation temperature 3.43 DEG C, heat pump Energy Efficiency Ratio is increased to 3.43 from 3.20, improves 7.2%, compressor power input is reduced to 0.730kW from 0.781kW, economize on electricity 7.0%, variable air rate blower fan 4 input power 0.170kW, thus realize effective warming function in winter.
During heat pump cycle 2 in winter, the compressor of volume flow 5.3m3/h, drive high pressure, overheated gaseous fluorine Leon working medium, flow through fin fluorine coil pipe 3 working medium side, under 38.4 DEG C of saturation temperatures release exhaust sensible heat, condensation latent heat, cross in the room air of cold sensible heat to 18 DEG C, become high pressure, supercooled liquid freon working medium, flow out through check-valves 6, enter throttling in expansion valve, flow through air evaporator working medium side again, absorb 0 DEG C of surrounding air Lowlevel thermal energy and evaporate and become low pressure, overheated gaseous fluorine Leon working medium, being attracted by compressor, forming gas-gas heat pump cycle; Variable air rate blower fan 4 is with the comparatively systemic circulation air quantity of 21.78m3/min, drive return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, humidifier 12, flow-guiding type end face air outlet 5, the coldest 18 DEG C of return air in ground are heated to wind pushing temperature 24.81 DEG C also humidification in the little temperature difference mode of Wind Volume 6.81 DEG C, form warm air curtain vertically upward and stop Air Infiltration, reduce building and heating thermic load 100W; Before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon heat cycles, improve room temperature uniformity; Noise is reduced to 33dB (A) when the silencing cotton 11 that shell 10 inwall completely pastes is for increasing air circulation in the winter time; Heat pump heating capacity is 4.22kW, by reducing condensation temperature 5.86 DEG C, heat pump Energy Efficiency Ratio is increased to 4.20 from 3.75, improves 12.0%; Compressor power input is reduced to 1.005kW from 1.113kW, economize on electricity 10.7%; Variable air rate blower fan 4 input power 0.170kW; Thus realize effective warming function in winter.
Cooling in summer circulation time, high pressure, supercooled liquid freon working medium, through filter 7-1 in expansion valve 7 after throttling, flow through fin fluorine coil pipe 3 working medium side, 27 DEG C of room air Lowlevel thermal energies are absorbed under 2 DEG C of saturation temperatures, and evaporation becomes low pressure, overheated gaseous fluorine Leon working medium, attracted by the compressor of volume flow 5.3m3/h and be collapsed into high pressure, overheated gaseous fluorine Leon working medium, flow through aerial condenser working medium side, to be vented sensible heats, condensation latent heat to 35 DEG C of surrounding air releases, to cross cold sensible heat; Form gas-gas kind of refrigeration cycle; Variable air rate blower fan 4 is with the comparatively partial circulating air quantity of 11.7m3/min, drive return through louvered side return air inlet 1, screen pack 2, fin fluorine coil pipe 3, flow-guiding type end face air outlet 5, cool in the large temperature difference mode of little air quantity 14 DEG C, the coldest 26 DEG C of return air in ground of dehumidifying to wind pushing temperature 12 DEG C, both reduced return air cooling load 50W; Simultaneously also by the infiltration of the hot blast of cooling air curtain stop vertically upward, reduce building air conditioning refrigeration duty 125W; Before exterior window, formation horizontal side return air and vertical top are blown on the ground, with unimpeded indoor return air siphon cool cycles, improve room temperature uniformity; The condensed water that in dehumidification process, fin fluorine coil pipe 3 outer surface is formed, then is continued to discharge shell 10 downwards by drainpipe 9 first to downstream in water accumulating disc 8 according to gravity; Air conditioner refrigerating amount 4.71kW, refrigeration efficiency than 3.36, compressor power input 1.403kW, variable air rate blower fan 4 input power 0.116kW; Thus realize high-efficiency air-condition function in summer; Distance product 1m place runs noise 35dB (A), product net weight 39kg.
Claims (3)
1. a fluorine coil pipe driving side air draught top air-out variable air rate air curtain vertically upward, it is by louvered side return air inlet (1); Screen pack (2); Fin fluorine coil pipe (3); Variable air rate blower fan (4); Flow-guiding type end face air outlet (5); Check-valves (6); Expansion valve (7); Filter (7-1); Water accumulating disc (8); Drainpipe (9); Shell (10); Silencing cotton (11); The compositions such as humidifier (12); It is characterized in that: louvered side return air inlet (1), screen pack (2), fin fluorine coil pipe (3), variable air rate blower fan (4), flow-guiding type end face air outlet (5), composition return air regulating loop; The fluorine gas pipe be connected in series, fin fluorine coil pipe (3), fluorine liquid pipe and check-valves (6) thereof are connected with filter (7-1) parallel component of expansion valve (7), wherein the flow direction of check-valves (6) deviates from connected fin fluorine coil pipe (3), composition freon heat pump fluid loop; Fin fluorine coil pipe (3) vertical immediately below the water accumulating disc (8) of level is set, water accumulating disc (8) bottom arranges drainpipe (9), composition condensed water outlet loop; Louvered side return air inlet (1) is arranged on shell (10) indoor, flow-guiding type end face air outlet (5) be arranged on shell (10) end face, fluorine liquid pipe and fluorine gas interface tube be arranged on shell (10) body of wall side, drainpipe (9) outlet be arranged on shell (10) bottom surface, composition shell (10) use port; Shell (10) inwall completely pastes silencing cotton (11).
2., according to fluorine coil pipe driving side air draught top air-out variable air rate according to claim 1 air curtain vertically upward, it is characterized in that: between variable air rate blower fan (4) to flow-guiding type end face air outlet (5), humidifier (12) is set.
3. according to fluorine coil pipe driving side air draught top air-out variable air rate according to claim 1 air curtain vertically upward, it is characterized in that: screen pack 2 is PM2.5 filter screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473900.2A CN105020834A (en) | 2015-07-28 | 2015-07-28 | Fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510473900.2A CN105020834A (en) | 2015-07-28 | 2015-07-28 | Fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain |
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| CN105020834A true CN105020834A (en) | 2015-11-04 |
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| CN201510473900.2A Pending CN105020834A (en) | 2015-07-28 | 2015-07-28 | Fluorine coil pipe drive side air suction top air outflow variable air volume vertically-upward air curtain |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032830A (en) * | 2020-09-09 | 2020-12-04 | 杨晨滈 | Novel fan coil energy release method and device |
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| CN112032830A (en) * | 2020-09-09 | 2020-12-04 | 杨晨滈 | Novel fan coil energy release method and device |
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