CN2916450Y - Highly-efficient air conditioner capable of reducing mean heat-transfer temperature difference - Google Patents
Highly-efficient air conditioner capable of reducing mean heat-transfer temperature difference Download PDFInfo
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- CN2916450Y CN2916450Y CNU2006200532697U CN200620053269U CN2916450Y CN 2916450 Y CN2916450 Y CN 2916450Y CN U2006200532697 U CNU2006200532697 U CN U2006200532697U CN 200620053269 U CN200620053269 U CN 200620053269U CN 2916450 Y CN2916450 Y CN 2916450Y
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- heat transfer
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- evaporimeter
- pipe
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Abstract
The utility model discloses a high efficiency air conditioner which reduces average transfer temperature difference and has different evaporator combination types. Wherein, a light pipe is used as a front pipe at windward side, and a rifled pipe is used as a rear pipe at leeward side; or a flat sheet is used as a front fin at the windward side and a corrugated sheet is used as a rear fin at the leeward side, or a larger sheet interval for the front fin at the windward side but a smaller sheet interval for the rear fin at the leeward side. Generally, heat transfer coefficient of the rear pipe is bigger than that of the front pipe, or heat transfer area of the rear pipe is bigger than that of the front pipe, or both heat transfer coefficient and the heat transfer area are bigger than that of the front pipe. In this way, heat transfer coefficient or heat transfer area at the windward side of the evaporator is relevantly smaller, and these at the leeward side is relevantly larger, which will perfect equality of temperature difference field, reduces average heat transfer temperature difference of the evaporator and decreases irreversible loss of refrigeration cycle and improves refrigeration efficiency of the heat exchanger.
Description
Technical field
The utility model relates to a kind of air-cooled tube wing-type air-conditioner, belongs to the technical field that refrigeration plant is made.
Background technology
Refrigeration air-conditioner according to the work of steam compression type refrigeration circulation theory, comprise domestic air conditioning, business air conditioner, central air-conditioning and vehicle air conditioning etc., also comprise dehumidifier, Teat pump boiler, will comprise compressor, condenser, throttling arrangement and four basic elements of character of evaporimeter at least.The evaporimeter of refrigeration air-conditioner is the heat exchanger that cold-producing medium absorbs heat outside system.
One class air-cooled tube wing-type evaporimeter, cold-producing medium be in the inboard evaporation heat absorption of pipe, and air flows through from the pipe outside under the effect of blower fan and is cooled.In order to increase heat transfer area, pipe is outer generally to be equipped with fin (nest plate or around sheet) more, and adopts mode double or that arrange comb more.Double or to arrange the cooling grid cast identical with the sheet type more, its heat transfer coefficient is also roughly the same.Because the heat transfer temperature difference of the windward side that pipe is outer is bigger, the comb heat exchange efficiency is also higher before the evaporimeter of windward side.But temperature reduced after air passed through the preceding comb of evaporimeter, reduce with the inboard cold-producing medium heat transfer temperature difference of pipe, thereby the evaporimeter rear of tube heat exchange efficiency of intermediate layer and leeward side was very low.
Investigate this double or arrange the air-cooled tube wing-type evaporimeter of comb more, because caliber (is generally Φ 4～12mm) greatly, the pressure loss of cold-producing medium by evaporimeter the time is also less (to be generally 10～100kPa), the evaporating temperature of the cold-producing medium of one-component in whole evaporimeter changes less (being generally 0.5～3 ℃), can be similar to think that the inboard cold-producing medium evaporating temperature of pipe does not become TR.
The air intake in the pipe outside is the higher room temperature of temperature (T0), and with the inside and outside heat transfer temperature difference TF=T0-TR of pipe during the comb heat exchange before the evaporimeter of windward side, air is flowed through before the evaporimeter, and temperature is reduced to T1＜T0 behind the comb.During again with the evaporimeter rear of tube heat exchange of leeward side, also be reduced to TB=T1-TR＜TF with the outer heat transfer temperature difference of pipe in the pipe.(Q is a heat output in the formula according to thermal conduction study formula Q=KA T, K is a heat transfer coefficient, and A is a heat transfer area, and T is a heat transfer temperature difference) as can be known, if usable floor area, the dual-row evaporator that structure is identical, leeward evaporimeter rear of tube exchange capability of heat will be significantly less than the exchange capability of heat of the preceding comb of evaporimeter that facings the wind.Test and Computer simulation results all show.Advance the single channel stringing mode that discharge the back according to the cold-producing medium front row, under the standard condition of GB/T7725 defined, the heat exchange amount of comb is about 60～75% of total heat exchange amount before the evaporimeter, and the heat exchange amount of evaporimeter rear of tube is about total heat exchange amount 25～40%.Equally, for the evaporimeter of many rows comb, comb heat exchange efficiency the best before the evaporimeter, the central evaporator heat exchange efficiency reduces, and evaporimeter rear of tube heat exchange efficiency is the poorest, and the total exchange capability of heat of heat exchanger is lower.
By the non-azeotropic mixed working medium cold-producing medium, or the multi-level throttle mode can change and respectively arrange evaporating temperature in the Tube Sheet of Heat Exchanger, thereby reduces the mean temperature difference of heat exchange.But the two all requires evaporimeter by from back and preceding mode order stringing, exists when intersecting stringing then can not effectively address this problem.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of high efficiency air conditioner that reduces heat transfer temperature difference is provided, make the heat transfer coefficient of back row's leeward side of heat exchanger or heat transfer area heat transfer coefficient or heat transfer area greater than front-seat windward side, reduce the irreversible loss of evaporation process, improve the refrigerating efficiency of air-conditioner.
Collaborative theoretical according to the field in the augmentation of heat transfer, by making up different heat exchanger forms, make the heat transfer coefficient of the front-seat windward side of heat exchanger less relatively, the heat transfer coefficient of back row's leeward side is relatively large, or the heat transfer area of front-seat windward side is less relatively, the heat transfer area of back row's leeward side is relatively large, then can improve the uniformity of temperature difference field, reduce the mean temperature difference of heat exchanger, improve the heat exchange amount of back row's leeward side and in total heat exchange amount shared ratio, improve total exchange capability of heat of heat exchanger.
The technical solution of the utility model is: a kind of high efficiency air conditioner, comprise compressor, condenser, throttle part, evaporimeter, it is characterized in that: described evaporimeter and/or condenser comprise the preceding comb of being located at windward side and the rear of tube of being located at leeward side at least, the heat transfer coefficient of described rear of tube is greater than the heat transfer coefficient of preceding comb, perhaps the heat transfer area of rear of tube is greater than the heat transfer area of preceding comb, and perhaps the heat transfer coefficient of rear of tube and heat transfer area are all greater than the heat transfer coefficient and the heat transfer area of preceding comb.That is to say, evaporimeter and/or condenser by the combination of different copper pipes and fin form, are arranged the heat transfer coefficient of the heat transfer coefficient of leeward side greater than front-seat windward side thereafter, or afterwards arrange the heat transfer area of the heat transfer area of leeward side, or adopt the combination of the two greater than front-seat windward side.
Comb and rear of tube are copper pipe before described, and the heat transfer coefficient of front-seat copper pipe is less than the heat transfer coefficient of rear of tube copper pipe.That is to say that its evaporimeter and/or condenser use the combination of dissimilar copper pipes: the preceding comb of windward side uses the less copper pipe of heat transfer coefficient, and the rear of tube of leeward side uses the bigger copper pipe of heat transfer coefficient.Use the naked body copper pipe as preceding comb, rear of tube uses riffled tube.
Perhaps, the heat transfer coefficient of the described preceding set fin of comb is less than the set fin heat transfer coefficient of rear of tube.That is to say that its evaporimeter and/or condenser use the combination of different sheet shape fins: the front-seat fin of windward side uses the less sheet type of heat transfer coefficient, and back row's fin of leeward side uses the bigger sheet type of heat transfer coefficient.Use plain film as front-seat fin, rear of tube uses back row's fin to use corrugated plate or calking sheet.
Perhaps, the spacing of the described preceding set fin of comb is greater than the spacing of the set fin of rear of tube.That is to say that its evaporimeter and/or condenser use the combination of different pitch of fins: the front-seat fin of windward side uses bigger sheet spacing, and its heat transfer area is less; Back row's fin of leeward side uses less sheet spacing, and its heat transfer area is bigger.
Perhaps, its evaporimeter and/or condenser also can adopt the combination of two or more implementations of above-mentioned copper pipe or fin simultaneously.
Obviously, the high efficiency air conditioner that reduces heat transfer temperature difference provided by the utility model also can be provided with four-way change-over valve, thereby make the utility model be applied to air conditioner in its refrigeration system.The utility model can also be applied to other refrigeration air-conditioner that uses air-cooled tube wing-type heat exchanger, comprises domestic air conditioning, business air conditioner, central air-conditioning and vehicle air conditioning etc., also comprises dehumidifier, Teat pump boiler.
Compared with prior art, the heat transfer coefficient or the heat transfer area difference of the forward and backward row's heat exchanger in the high efficiency air conditioner that reduces mean temperature difference provided by the utility model, can improve the uniformity of temperature difference field, reduce the mean temperature difference of heat exchanger, reduce the irreversible loss of kind of refrigeration cycle, improved the refrigerating efficiency of air-conditioner.What specify is, the flow direction that the front and rear row of heat exchanger described in the utility model is relative air by heat exchanger, windward side is called the front row, and leeward side becomes back row, rather than the front and back on the physical significance.
Description of drawings
Below in conjunction with the drawings and the specific embodiments heat exchanger of the present utility model is further described:
Accompanying drawing 1 is for using the side view of detachable wall hanging type air conditioner indoor unit of the present utility model;
Accompanying drawing 2 is for using the side view that the utility model is used for window air conditioner;
Accompanying drawing 3 is the vertical view of Fig. 2.
The specific embodiment
Embodiment one:
As shown in Figure 1, use comprise in the air-conditioner of the present utility model by compressor, condenser, capillary, evaporimeter form the sealing refrigerating circuit, wherein compressor, condenser and capillary are installed in (not shown) in the air-conditioner outdoor unit.The grid of room air on outer cover 109, panel 110 enters indoor set and evaporimeter carries out heat exchange.Comb 103,104 is positioned at the windward side, the outside of evaporimeter rear of tube 105,106 before the evaporimeter.Comb 103,104 and evaporimeter rear of tube 105,106 all are air-cooled tube wing-type heat exchangers before the evaporimeter, are installed on the indoor set base 111, and are furnished with indoor motor 112, axial-flow fan 113.The inboard high pressure feed tube 101 of cold-producing medium inlet chamber behind capillary-compensated, being divided into two-way up and down by three-way pipe 102 enters and is positioned at the outside comb 103 and 104 before the evaporimeter of layer that facings the wind, enter the evaporimeter rear of tube 105 and 106 that is positioned at the inboard then, last two-way cold-producing medium is combined into the compressor return air mouth that a route low pressure muffler 108 returns off-premises station through threeway 107.
Comb 103,104 used copper pipes are light pipe before the evaporimeter, and its heat transfer coefficient is less; Evaporimeter rear of tube 105,106 used copper pipes are riffled tube, and its heat transfer coefficient is bigger.Comb 103,104 and evaporimeter rear of tube 105,106 can be made up of two row's evaporimeters of one before the evaporimeter, also can by two independently evaporimeter form, or form by the combination of the two.Need to prove that the position of front evaporator device rear of tube is the flow direction of inevitable corresponding cold-producing medium not, in order to make full use of the exchange capability of heat of evaporimeter, the existence that in whole evaporimeter stream, can have shunting and conflux.Different shunting modes, it can be the shunting in comb 103,104 or the evaporimeter rear of tube 105,106 before evaporimeter respectively, also can be the shunting between comb 103,104 and the evaporimeter rear of tube 105,106 before evaporimeter, promptly between double effect evaporator, exist stream to intersect.But no matter how refrigerant flow path is arranged, the heat transfer temperature difference TF that is in the copper pipe of front-seat windward side and air side is bigger, and the Coefficient K F of light pipe is less; The heat transfer temperature difference TB of the copper pipe of row windward side and air side is less after being in, and the Coefficient K B of riffled tube is bigger.Adopt the copper pipe of identical heat transfer coefficient to compare with front and rear row, this moment front and rear row the heat-transfer capability relative equilibrium of copper pipe, the temperature difference field of whole heat exchanger is comparatively even.
Result of the test shows that evaporimeter rear of tube 105,106 uses a kind of low flute profile inner screw thread copper pipe, all uses light pipe to compare with front evaporator device rear of tube, and after front and rear row used light pipe and riffled tube respectively in the present embodiment, the refrigerating capacity of air-conditioner had increased 13.2%; All use internal thread to compare with front evaporator device rear of tube, after front and rear row used light pipe and riffled tube respectively in the present embodiment, the refrigerating capacity of air-conditioner had increased 3.9%.
Embodiment two:
As accompanying drawing 2, shown in Figure 3, use window air conditioner of the present utility model and comprise that the air entry by comb 205, evaporimeter rear of tube 206 and compressor 201 before comb 202, condenser rear of tube 203, capillary 204, the evaporimeter before the exhaust outlet of compressor 201, the condenser is communicated with the refrigerating circuit that forms sealing successively.
Comb, rear of tube and the forward and backward comb of condenser all are the air-flow directions of relative and flow through evaporimeter and condenser before the evaporimeter, and certainty is corresponding with its physical location.Comb 202 is positioned at the windward side of condenser rear of tube 203 before the condenser, and comb 202 and condenser rear of tube 203 all are air-cooled tube wing-type heat exchangers before the condenser, and are furnished with back air channel 210 and aerofoil fan 211.Comb 205 is positioned at the windward side of evaporimeter rear of tube 206 before the evaporimeter, and comb 205 and evaporimeter rear of tube 206 all are air-cooled tube wing-type heat exchangers before the evaporimeter, and is furnished with primary air separating duct 208 and centrifugal fan 209.The electric system 212 that air-conditioner casing 207 is used to that the parts of above-mentioned refrigeration system are installed and is used to control the air-conditioner operation.
Comb 205 used copper pipes are light pipe before the evaporimeter, and its heat transfer coefficient is less; Evaporimeter rear of tube 206 used copper pipes are a kind of low flute profile riffled tube, and its heat transfer coefficient is bigger.Comb 205 and evaporimeter rear of tube 206 can be made up of two row's evaporimeters of one before the evaporimeter, also can by two independently evaporimeter form, or form by the combination of the two.The heat transfer temperature difference TF that is in the copper pipe of front-seat windward side and air side is bigger, and the Coefficient K F of light pipe is less; The heat transfer temperature difference TB of the copper pipe of row windward side and air side is less after being in, and the Coefficient K B of riffled tube is bigger.Adopt the copper pipe of identical heat transfer coefficient to compare with front and rear row, this moment front and rear row the heat-transfer capability relative equilibrium of copper pipe, the temperature difference field of whole heat exchanger is comparatively even.
Computer simulation results shows, evaporimeter rear of tube 206 uses a kind of low flute profile inner screw thread copper pipe, according to identical heat exchanger shunting stringing mode, under the standard condition of GB/T7725 defined, the heat exchange amount of comb reaches 56% of total heat exchange amount before the evaporimeter, and the heat exchange amount of evaporimeter rear of tube reaches total heat exchange amount 44%.When the forward and backward comb of evaporimeter all used light pipe, the heat exchange amount of comb accounted for total heat exchange amount 69% before the evaporimeter, and the heat exchange amount of evaporimeter rear of tube only accounts for 31%.Test shows, all uses light pipe, the forward and backward comb of condenser all to use the plain film of 1.8 millimeters of pitch of fins to compare with the forward and backward comb of evaporimeter, adopts the refrigerating capacity of the air-conditioner of the described technical scheme of present embodiment to increase 18.7%; With comb before and after comb before and after the evaporimeter all uses riffled tube, condenser all single bridge of 1.5 millimeters of pitch of fins sheet of charging compare, adopt the refrigerating capacity of the air-conditioner of the described technical scheme of present embodiment to increase 6.3%.
Claims (7)
1. high efficiency air conditioner, comprise compressor, condenser, throttle part, evaporimeter, it is characterized in that: described evaporimeter and/or condenser comprise the preceding comb of being located at windward side and the rear of tube of being located at leeward side at least, the heat transfer coefficient of described rear of tube is greater than the heat transfer coefficient of preceding comb, perhaps the heat transfer area of rear of tube is greater than the heat transfer area of preceding comb, and perhaps the heat transfer coefficient of rear of tube and heat transfer area are all greater than the heat transfer coefficient and the heat transfer area of preceding comb.
2. high efficiency air conditioner according to claim 1 is characterized in that: comb and rear of tube are copper pipe before described, and the heat transfer coefficient of front-seat copper pipe is less than the heat transfer coefficient of rear copper pipe.
3. high efficiency air conditioner according to claim 2 is characterized in that: comb is the naked body copper pipe before described, and rear of tube is a riffled tube.
4. according to each described high efficiency air conditioner of claim 1 to 3, it is characterized in that: the heat transfer coefficient of the set fin of comb is less than the heat transfer coefficient of the set fin of rear of tube before described.
5. high efficiency air conditioner according to claim 4 is characterized in that: described front-seat fin is a plain film, and back row's fin is corrugated plate or calking sheet.
6. according to each described high efficiency air conditioner of claim 1 to 3, it is characterized in that: the spacing of the set fin of comb is greater than the spacing of the set fin of rear of tube before described.
7. high efficiency air conditioner according to claim 4 is characterized in that: the spacing of the set fin of comb is greater than the spacing of the set fin of rear of tube before described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200532697U CN2916450Y (en) | 2006-01-05 | 2006-01-05 | Highly-efficient air conditioner capable of reducing mean heat-transfer temperature difference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200532697U CN2916450Y (en) | 2006-01-05 | 2006-01-05 | Highly-efficient air conditioner capable of reducing mean heat-transfer temperature difference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2916450Y true CN2916450Y (en) | 2007-06-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200532697U Expired - Fee Related CN2916450Y (en) | 2006-01-05 | 2006-01-05 | Highly-efficient air conditioner capable of reducing mean heat-transfer temperature difference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2916450Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403394A (en) * | 2016-11-29 | 2017-02-15 | 美的集团武汉制冷设备有限公司 | Pipe of evaporator, evaporator and air conditioner |
-
2006
- 2006-01-05 CN CNU2006200532697U patent/CN2916450Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403394A (en) * | 2016-11-29 | 2017-02-15 | 美的集团武汉制冷设备有限公司 | Pipe of evaporator, evaporator and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |