CN103528394B - Arc-shaped sealing type finned tube radiator - Google Patents
Arc-shaped sealing type finned tube radiator Download PDFInfo
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- CN103528394B CN103528394B CN201310454770.9A CN201310454770A CN103528394B CN 103528394 B CN103528394 B CN 103528394B CN 201310454770 A CN201310454770 A CN 201310454770A CN 103528394 B CN103528394 B CN 103528394B
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Abstract
The invention provides an arc-shaped sealing type finned tube radiator. The arc-shaped sealing type finned tube radiator comprises an upper integrated pipe, a lower integrated pipe and a fin pipe connecting the upper integrated pipe and the lower integrated pipe. The fin pipe comprises a circular base pipe, a first fin, a second fin, a third fin and a fourth fin. A first connecting sheet is arranged between the first fin and the second fin, a second connecting sheet is arranged between the third fin and the fourth fin, and the first connecting sheet and the second connecting sheet are arc-shaped metal plates. The structure of the fin pipe is optimized, the heat exchanging efficiency of the fin pipe is maximized to save energy, and the purposes of protecting the environment and saving the energy are achieved.
Description
Technical field
The invention belongs to field of heat exchangers, relate in particular to a kind of heating circular arc type closed finned tube radiator.
Background technology
The terminal device of Home Heating, thermal source is generally city central heating, self-built boiler room, community, Domestic wall stove etc., by heat conduction, radiation, convection current, heat is dispelled the heat out, allows the temperature in room get a promotion.
In radiator; be suitable for widely at present finned tubular radiator; can expand area of dissipation by fin; strengthen heat transfer effect; but the setting of the fansink-type of finned tube and finned tube parameter is the quality of influencer's radiating effect all; and at present in the situation that of energy crisis; urgent need will be saved the energy; meet social sustainable development; therefore need to develop a kind of new finned tube, need the structure of finned tube to be optimized simultaneously, make it reach heat exchange efficiency and maximize; to save the energy, reach the object of environmental protection and energy saving.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new circular arc type closed finned tube radiator.
To achieve these goals, technical scheme of the present invention is as follows: a kind of circular arc type closed finned tube radiator, comprise the finned tube of upper header, lower collector pipe and connection upper header and lower collector pipe, described finned tube comprises circular base tube and the first fin, the second fin, the extended line that the first fin and the second fin are arranged on outside and the first fin and second fin of base tube intersects at the central axis of the base tube at the place, the center of circle of base tube, and the first fin and the second fin are along by the first level crossing picture symmetry of base tube central axis; Described finned tube comprises the 3rd fin and the 4th fin, described the 3rd fin, the 4th fin along the second plane respectively with the first fin and the second fin mirror image symmetry, described the second plane is vertical with the first plane and through the central axis of base tube; Between described the first fin and the second fin, the first brace is set, between described the 3rd fin and the 4th fin, the second brace is set, the first brace and the second brace are circular arc type metallic plate; The 3rd fin of the first fin, the second fin and adjacent fins pipe and the 4th fin form space; The central axis at place, the center of circle of described circular arc type metallic plate and the central axes of base tube; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other; The first fin of adjacent base tube is parallel to each other.
Angle between described the first fin and the second fin is A, and the length of the first fin and the second fin is L, and the outer radius of base tube is R, the fin height H along base tube on axially, and above-mentioned four relation meets following formula:
Sin(A/2)=a*(L/R)
2+b*(L/R)+c
H/ (R*10)=e*Sin (A/2)
2wherein, A unit is angle to-f*Sin (A/2)+h, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<R<1200mm,
A, b, c, e, f, h are coefficient, and the scope of a is 0.04-0.042, and the scope of b is 0.266-0.28, and the scope of c is 0.36-0.37, and the scope of e is 21-23, and the scope of f is 44-45, and h is 23-25.
The optimum of parameter is: a is that 0.0412, b is that 0.02715, c is that 0.03628, e is that 22, f is that 44.37, h is 23.86.
As one preferably, the distance between adjacent base tube central axis is S=d*(L+R) * sin (A/2), wherein d is 1.1-1.2.
The optimum results of d is 1.118.
The material of described base tube and fin is aluminium alloy, and the mass percent of the component of described aluminium alloy is as follows: 3.0%Cu, and 1.9%Mg, 1.6%Ag, 0.6%Mn, 0.25%Zr, 0.3%Ce, 0.23%Ti, 0.38%Si, all the other are Al.
The pipe inside of described base tube arranges anticorrosive coat, and the outside of base tube is coated with coating rubbing-layer, and the thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively.
Described radiator also comprises control system, and according to indoor temperature, control enters the flow velocity of water in radiator to described control system.
Described control system comprises: temperature sensor, flow controller and central controller, and flow controller control enters the flow velocity of radiator, described temperature sensor is used for measuring indoor temperature, in the time that indoor temperature reaches the first temperature, central controller controls flow controller reaches the first flow velocity, in the time that indoor temperature reaches the second temperature higher than the first temperature, central controller controls flow controller reaches the second flow velocity lower than the first flow velocity, in the time that indoor temperature reaches the 3rd temperature higher than the second temperature, central controller controls flow controller reaches the 3rd flow velocity lower than the second flow velocity, in the time that indoor temperature reaches the 4th temperature higher than the 3rd temperature, central controller controls flow controller reaches the 4th flow velocity lower than the 3rd flow velocity, in the time that indoor temperature reaches the 5th temperature higher than the 4th temperature, central controller cuts out flow controller, stops water to enter radiator.
Described anticorrosive coat is grouped into by following one-tenth:
Zinc flake 8.3%, aluminium oxide is 8%, and boric acid is 7.3%, and acrylic acid is 0.7%, and wetting dispersing agent is 0.4%, and thickener is 0.15%, and defoamer is 0.23%, the water of surplus.
Described wetting dispersing agent is the SA-20 in peregal series, and described thickener is selected hydroxyethylcellulose; Described defoamer is selected tributyl phosphate.
In the axial direction of base tube, there is no fin near the part of upper header and lower collector pipe.
Base tube is greater than the length that there is no fin part near upper fin near the length of the part that there is no fin of the part of lower collector pipe.
Compared with prior art, solar water appliance of the present invention has following advantage:
1) the invention provides a kind of new finned tube, and because the extension line of fin and the central axes of base tube of finned tube, thereby make heat transfer effect reach best.
2) the present invention is by test of many times, designed the fin of different tube diameters, differing heights, angle and tested, thereby obtained an optimum fin optimum results, and verified by test, thereby proved the accuracy of result.
3) reasonable distribution of the mass percent of the component by aluminium alloy, improves high-fire resistance and the high-termal conductivity of finned tube.
4) thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively, ensures that the expansion rate of each layer is identical in logical hot water, ensures to prevent from each layer combine closely coming off.
5) by control system, automatically control the flow velocity of the water that enters radiator, keep room temperature to reach a stable numerical value.
6) by there is no fin near the part of upper header and lower collector pipe in the axial direction of base tube, the air that has ensured base tube bottom can carry out in the space of finned tube smoothly, reached good suction effect, also can ensure simultaneously air technology to top convection current, increase the effect of heat convection.
7) be greater than the length that there is no fin part near upper fin by base tube near the length of the part that there is no fin of the part of lower collector pipe, can increase convection effects.
Brief description of the drawings
Fig. 1 is the schematic diagram of radiator of the present invention;
Fig. 2 is the cross sectional representation of finned tube;
Fig. 3 is the schematic diagram of radiator control system;
Fig. 4 is the schematic diagram that Fig. 3 sees from left side.
Reference numeral is as follows:
1 upper header, does not have the part of fin, 3 lower collector pipe in 2 base tubes, 4 finned tubes, 5 base tubes, 6 water the first fins, 7 gaps, 8 first braces, 9 second fins, 10 the 4th fins, 11 the 3rd fins, 12 second braces, 13 central controllers, 14 flow controllers, 15 temperature sensors, 16 temperature sensors, 17 radiators
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
, if there is no specified otherwise, relate to formula herein, "/" represents division, and "×", " * " represent multiplication.
A kind of circular arc type closed finned tube radiator 17, comprise upper header 1, lower collector pipe 3 and be connected upper header 1 and the finned tube 4 of lower collector pipe 3, described finned tube 4 comprises circular base tube 5 and the first fin 6, the second fin 9, the extended line that the first fin 6 and the second fin 9 are arranged on outside and the first fin 6 and second fin 9 of base tube 5 intersects at the central axis of the base tube at the place, the center of circle of base tube 5, and the first fin 6 and the second fin 9 are along by the first plane B mirror image symmetry of base tube central axis; Described finned tube comprises the 3rd fin 11 and the 4th fin 10, described the 3rd fin 11, the 4th fin 10 along the second plane C respectively with the first fin 6 and the second fin 9 mirror image symmetries, described the second plane C is vertical with the first plane B and through the central axis of base tube 5; Between described the first fin 6 and the second fin 9, the first brace 8 is set, it is circular arc type metallic plate that the second brace 12, the first braces 8 and the second brace 12 are set between described the 3rd fin 11 and the 4th fin 10; The central axes of the central axis of described circular arc type metallic plate and base tube 5; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other.
Preferably, the first fin of adjacent base tube is parallel to each other, represents that the second fin of adjacent base tube is also parallel to each other, and in like manner, the 3rd fin, the 4th fin are also parallel to each other.This feature shows that finned tube arranges according to equidirectional.
It should be explained that, as shown in Figure 2, the central axis of base tube is exactly the line that the set of the centre point on the cross section of base tube 5 forms, and the central axis of circular arc type metallic plate is exactly the line that the set of the centre point of circular arc type metallic plate on cross section forms.The central axes of the central axis of described circular arc type metallic plate and base tube 5 just refers to that, on cross section, circular arc type metallic plate and base tube are concentric circles.
Preferably, the size of all finned tubes is all identical.
By above-mentioned setting, make to form a gap 7 between fin and brace, in heat convection, gap 7 has just formed a kind of chimney effect, can strengthen heat exchange.
The 3rd fin of the first fin, the second fin and adjacent fins pipe and the 4th fin form space, and this space forms certain space, can form chimney effect, adds strong convection, augmentation of heat transfer.
Angle between described the first fin 6 and the second fin 9 is A, and the length of the first fin 6 and the second fin 9 is L, and the outer radius of base tube is R, and certainly, because mirror image symmetry, the length of the 3rd fin 11 and the 4th fin 10 is also L naturally.But find in practice, if in heat transfer process. fin angle is too small, can hinder heat exchange, because the words that fin angle is too small, cause the first fin, the distance of the second fin is too near, temperature boundary layer starts in the direction along with base tube height to overlap in closed area, gas temperature approaches tube wall temperature and moves closer to hot saturated, flow resistance increases, finally worsen on the contrary heat exchange, the advantage of outer fin is brought into play not out, same reason, along with the constantly increase of angle, make brace originally nearer apart from the distance of base tube, make equally temperature boundary layer in closed area, in the direction along with base tube height, start to overlap, gas temperature approaches tube wall temperature and moves closer to hot saturated, flow resistance increases, finally worsen on the contrary heat exchange, therefore angle has an optimum value.
For finned length, if oversize, even because the heat of base tube could arrive in time the end of fin or be effective also not obvious, if too short, expand heat exchange area too little, cannot reach a good heat transfer effect, therefore the height of fin also has an optimum value.
For the distance between two finned tubes, if first distance is too near or completely close, between the brace of two finned tubes, the space of distance (referring to Fig. 1) is too little, air cannot enter the space forming between finned tube by the gap between fin, heat exchange now can only rely on from radiator bottom and enter air, cannot reach good heat convection effect, same reason, if the distance is too far, the the one the second the 3 4th fins of finned tube cannot form the space of effective chimney effect, thereby cause heat transfer effect variation, therefore also need a suitable numerical value for the distance between two finned tubes.
As shown in Figure 4, the base tube 5 of height H on axial along to(for) fin, also need to have a suitable numerical value, if fin height is too high, on the top of fin, because boundary layer starts in the direction along with base tube height to overlap in closed area, cause the deterioration of heat exchange, in like manner, highly too low, heat exchange is not given full play to, thereby affects heat transfer effect.
Therefore, the present invention is the size relationship of the finned tube of the best radiator that sums up of the test data of the radiator by multiple different sizes.Because finned tube also has included angle A, these three variablees of finned length L, fin height H, therefore, introduce two characteristic sin (A/2), L/R, H/R, R is the radius of base tube here, heat dissipation capacity maximum from heat transfer effect, has calculated nearly 200 kinds of forms.Described size relationship is as follows:
Angle between described the first fin and the second fin is A, and the length of the first fin and the second fin is L, and the outer radius of base tube is R, the fin height H along base tube on axially, and above-mentioned four relation meets following formula:
Sin(A/2)=a×(L/R)
2+b×(L/R)+c
H/ (R × 10)=e × Sin (A/2)
2wherein, A unit is angle to-f × Sin (A/2)+h, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<R<1200mm,
A, b, c, e, f, h are coefficient, and the scope of a is 0.04-0.042, and the scope of b is 0.266-0.28, and the scope of c is 0.36-0.37, and the scope of e is 21-23, and the scope of f is 44-45, and h is 23-25.
By testing after result of calculation, by the numerical value of computation bound and median, the result of gained matches with formula substantially again, and error is substantially in 4%, and maximum relative error is no more than 6%, and mean error is 2%.；
The optimum of coefficient optimization is: a is that 0.0412, b is that 0.02715, c is that 0.03628, e is that 22, f is that 44.37, h is 23.86.
Preferably, the distance between adjacent base tube central axis is S=d × (L+R) × sin (A/2), and wherein d is 1.1-1.2.
As shown in Figure 2, the distance between adjacent base tube central axis is exactly the distance between two base tube centers of circle on cross section.
The optimum results of d is 1.118.
The material of base tube and fin is aluminium alloy, and the mass percent of the component of described aluminium alloy is as follows: 3.0%Cu, and 1.9%Mg, 1.6%Ag, 0.6%Mn, 0.25%Zr, 0.3%Ce, 0.23%Ti, 0.38%Si, all the other are Al.
The manufacture method of aluminium alloy is: adopt vacuum metallurgy melting, argon for protecting pouring becomes circle base, through 600 DEG C of homogenising processing, at 400 DEG C, adopts and is hot extruded into bar, and then after 580 DEG C of solution hardening, carry out artificial aging processing at 200 DEG C.Thermal conductivity factor is for being greater than 250W/ (m*k).
Base tube and fin can be integrally manufactured, also can split manufacture, and base tube and fin can be also different materials, and for example base tube is above-mentioned aluminium alloy, and fin can adopt other alloys, and wherein other alloy compositions are as follows:
The following Ni 30% of mass percent; Cr 20%; Al 6%; C 0.03%; B 0.016%; Co 2%; Ti 3%; Nb 0.1%; La 0.2%; Ce0.2%; Fe surplus.
The manufacture method of alloy is: become ingot by the composition smelting and pouring according to electrothermal alloy in vaccum sensitive stove, then at 1200 DEG C-900 DEG C, alloy pig forge hot is become to bar, be rolled into dish material at 1200 DEG C-900 DEG C, then become the silk material of different size in room temperature cold-drawn.
After tested, above-mentioned alloy has very high thermal conductivity factor.
The pipe inside of described base tube 5 arranges anticorrosive coat, and the outside of base tube is coated with coating rubbing-layer, and the thermal coefficient of expansion of anticorrosive coat, base tube and wearing layer increases successively.Why so arranging is because in the process of heat supply, the anticorrosive coat of the inside of finned tube is first heated, first expand, then be outwards the second layer, the 3rd layer of expanded by heating successively, therefore from inside to outside three layers of expansion number of times increase successively and can ensure that expansion rate is consistent substantially, ensure each layer of compactness and the stability connecting.
As shown in Figure 3, described radiator also comprises control system, and according to indoor temperature, control enters the flow velocity of water in radiator to described control system.
Described control system comprises: temperature sensor (not illustrating in Fig. 3), flow controller 14 and central controller 13, and flow controller 14 is controlled the flow velocity of the water that enters radiator, described temperature sensor is used for measuring indoor temperature, when indoor temperature is during lower than the first temperature, flow controller is all opened, in the time that indoor temperature reaches the first temperature, central controller controls flow controller reaches the first flow velocity, the first flow velocity will be lower than the flow velocity of all opening, in the time that indoor temperature reaches the second temperature higher than the first temperature, central controller controls flow velocity reaches the second flow velocity lower than the first flow speed controller, in the time that indoor temperature reaches the 3rd temperature higher than the second temperature, central controller controls flow controller reaches the 3rd flow velocity lower than the second flow velocity, in the time that indoor temperature reaches the 4th temperature higher than the 3rd temperature, central controller controls flow controller reaches the 4th flow velocity lower than the 3rd flow velocity, in the time that indoor temperature reaches the 5th temperature higher than the 4th temperature, central controller cuts out flow controller, stops water to enter radiator.
The 5th temperature is exactly for very high temperature, and for example more than 25 degree, the first temperature is exactly lower temperature, for example, below 15 degree.By above-mentioned setting, can be according to the more heat of temperature control radiator, reach the effect of saving the energy, especially next step will develop according to heat charging, therefore will inevitably receive an acclaim.
In addition, can set temperature sensor 15,16 be used for measuring the temperature of water that enters and go out radiator.
Described control system can be a single-chip microcomputer, and control panel can be set, and control panel is arranged on top or the bottom of radiator, also can be arranged on the pipeline that enters radiator.
Described anticorrosive coat is to generate by applying anticorrosive paint, and anticorrosive paint is grouped into by following one-tenth: zinc flake 8.3%, and aluminium oxide is 8%, boric acid is 7.3%, and acrylic acid is 0.7%, and wetting dispersing agent is 0.4%, thickener is 0.15%, and defoamer is 0.23%, the water of surplus.
A method of preparing above-mentioned water-based anticorrosive paint, the method is implemented according to following steps,
A, press coating gross mass percentage, take respectively a certain amount of water, 0.4% wetting dispersing agent and 0.23% defoamer, then admixed together, fully stir to make it to dissolve and make coating mixed liquor A 1, to adding 8.3% the flake metal powder that accounts for coating gross mass in mixed liquor A 1, stir and make coating mixed liquor A 2 again;
B, press coating gross mass percentage, take 7.3% boric acid, composition mixed liquor, joins in 20%～40% water and fully dissolves and make inorganic acid mixed liquid B 1, then to
In mixed liquid B 1, add 8% oxidate powder, be stirred to without precipitation and make inorganic acid mixed liquid B 2;
C, press coating gross mass percentage, take 0.7% acrylic acid, join in 5%～15% water, stir and make reducing agent mixed liquor C;
D, press coating gross mass percentage, take 0.15% thickener hydroxyethylcellulose, join in 2.5%～15% water, be stirred to and dissolve be translucent shape and gel-free and occur stopping stirring making thickener mixed liquor D;
E, the inorganic acid mixed liquid B 2 of preparation is joined in coating mixed liquor A 2, then add 1/5～1/2 of reducing agent mixed liquor C amount of preparation, add while stirring thickener mixed liquor D, add again the water of surplus, continue to stir 30～90 minutes, until coating mixed liquor uniformity without agglomerated particle, finally adds remaining reducing agent mixed liquor C again, stir again 10～40 minutes, to obtain final product.
This kind of coating is applied over finned tube surface by spraying, brushing, dip-coating, dries 10～60 minutes for 80 ± 10 DEG C, and 280 ± 40 DEG C of curing sintering 30～60 minutes, form good anti-corrosion coating.
Described wetting dispersing agent is the SA-20 in peregal series, and described thickener is selected hydroxyethylcellulose; Described defoamer is selected tributyl phosphate.
As shown in Figure 1, in the axial direction of base tube 5, there is no fin near the part of upper header and lower collector pipe.The air that can ensure like this bottom can enter in the space forming between fin, out from air top, strengthens convection effects simultaneously.
As shown in Figure 4, base tube 5 is greater than the length that there is no fin part near upper fin near the length of the part that there is no fin of the part of lower collector pipe.Main can ensure entering of more air because be that bottom air surface density is large, upper air density is little, and air more easily rises, and therefore can keep air to enter and go out finned tube amount and substantially be consistent.
Preferably, bottom do not have the length of the part of fin account for base tube 5 length 5%, top do not have the length of the part of fin account for base tube 5 length 3%.
The inwall of base tube 5 can arrange fin, for example, straight fins or helical fin can be set, and the height of described fin can be along with increasing gradually in the mobile direction of fluid, the highest fin height be minimum 1.05-1.1 doubly.Main cause is the direction mobile along with fluid, the temperature of fluid declines gradually, and its heat transfer effect is reduced gradually, by the height that increases inner fins, difference is set, heat exchange on can enhance fluid flow direction, thus heat transfer effect is consistent on the whole along fluid flow direction.
Although the present invention discloses as above with preferred embodiment, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (2)
1. a circular arc type closed finned tube radiator, comprise the finned tube of upper header, lower collector pipe and connection upper header and lower collector pipe, described finned tube comprises circular base tube and the first fin, the second fin, the extended line that the first fin and the second fin are arranged on outside and the first fin and second fin of base tube intersects at the central axis of the base tube at the place, the center of circle of base tube, and the first fin and the second fin are along by the first level crossing picture symmetry of base tube central axis; Described finned tube comprises the 3rd fin and the 4th fin, described the 3rd fin, the 4th fin along the second plane respectively with the first fin and the second fin mirror image symmetry, described the second plane is vertical with the first plane and through the central axis of base tube; Between described the first fin and the second fin, the first brace is set, between described the 3rd fin and the 4th fin, the second brace is set, the first brace and the second brace are circular arc type metallic plate; The 3rd fin of the first fin, the second fin and adjacent fins pipe and the 4th fin form space; The central axis at place, the center of circle of described circular arc type metallic plate and the central axes of base tube; Described base tube is straight tube, and the central axis of described adjacent base tube is parallel to each other;
It is characterized in that: the angle between described the first fin and the second fin is A, the length of the first fin and the second fin is L, and the outer radius of base tube is R, the fin height H along base tube on axially, and above-mentioned four relation meets following formula:
Sin(A/2)=a×(L/R)
2+b×(L/R)+c
H/(R×10)=e×Sin(A/2)
2-f×Sin(A/2)+h；
Wherein, A unit is angle, 60 ° of <A<110 °,
L is of a size of mm, 12mm<L<80mm,
The unit of R is mm, 10mm<R<80mm,
The unit of H is mm, 800mm<H<1200mm,
A, b, c, e, f, h are coefficient, and the scope of a is 0.04-0.042, and the scope of b is 0.266-0.28, and the scope of c is 0.36-0.37, and the scope of e is 21-23, and the scope of f is 44-45, and h is 23-25.
2.circular arc type closed finned tube radiator according to claim 1, is characterized in that: wherein a is that 0.0412, b is that 0.02715, c is that 0.03628, e is that 22, f is that 44.37, h is 23.86.
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| CN201310454770.9A CN103528394B (en) | 2013-09-27 | 2013-09-27 | Arc-shaped sealing type finned tube radiator |
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| CN201310454770.9A CN103528394B (en) | 2013-09-27 | 2013-09-27 | Arc-shaped sealing type finned tube radiator |
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| CN201310507085.8A Division CN103542735B (en) | 2013-09-27 | 2013-09-27 | Enclosed arc finned tube radiator with partial smooth tubes |
| CN201310508491.6A Division CN103542736B (en) | 2013-09-27 | 2013-09-27 | Inner-fin arc-shaped closed-type finned pipe radiator |
| CN201310514446.1A Division CN103512391B (en) | 2013-09-27 | 2013-09-27 | Arc-shaped enclosed finned tube |
| CN201310506940.3A Division CN103542734B (en) | 2013-09-27 | 2013-09-27 | Enclosed arc finned tube radiator of different alloys |
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| CN103528394B true CN103528394B (en) | 2014-07-23 |
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| CN103925627B (en) * | 2014-04-02 | 2016-05-25 | 荣启华 | A kind of heating system |
| CN103939978B (en) * | 2014-04-02 | 2016-08-17 | 烟台民望机电技术有限公司 | A kind of therrmodynamic system automatically controlling heat supply |
| CN108458621B (en) * | 2018-04-03 | 2019-09-20 | 珠海格力电器股份有限公司 | Fin, heat exchanger and air conditioner |
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| JP3811123B2 (en) * | 2002-12-10 | 2006-08-16 | 松下電器産業株式会社 | Double tube heat exchanger |
| WO2010089957A1 (en) * | 2009-02-05 | 2010-08-12 | パナソニック株式会社 | Heat exchanger |
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