CN103759566A - Method for designing corrugated fin heat exchanger for frequency conversion CO2 heat-pump water heater - Google Patents
Method for designing corrugated fin heat exchanger for frequency conversion CO2 heat-pump water heater Download PDFInfo
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- CN103759566A CN103759566A CN201310749785.8A CN201310749785A CN103759566A CN 103759566 A CN103759566 A CN 103759566A CN 201310749785 A CN201310749785 A CN 201310749785A CN 103759566 A CN103759566 A CN 103759566A
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Abstract
The invention discloses a method for designing a corrugated fin heat exchanger for a frequency conversion CO2 heat-pump water heater. The method aims to achieve optimum performance in design of the frequency conversion CO2 heat-pump water heater. Fins of the heat exchanger of the water heater are corrugated, a central tube of the water heater is oval, the ratio of the short axis to the long axis is 0.6-0.8, the distances between the fins are (0.1-0.25) mm, and the thicknesses of the fins are (0.2-0.3) mm. Relevant parameters of the fins and the selected central tube are appropriate, the optimum water heater enhancement heat exchange performance can be achieved, and the method can be widely applied to the field of heat exchanger design.
Description
[technical field]
The present invention relates to a kind of method for designing of heat exchanger, particularly a kind of frequency conversion CO
2heat pump water heater heat exchanger.
[background technology]
Frequency conversion CO
2the approach of Teat pump boiler enhanced heat exchange performance is mainly divided into two kinds: (1) changes the object that fin shape reaches enhanced heat exchange, common are corrugated fin, slitted fin, louvered fin etc.; (2) shape that changes pipe reaches the object of enhanced heat exchange, and conventional have elliptical tube, multi-channel flat pipe, a bellows tube etc.With respect to plain fin, corrugated fin can well enhanced heat exchange, but has also increased greatly drag losses simultaneously.Elliptical tube has better fluid interchange characteristic than pipe, and the pipe that the heat exchange property of elliptical tube compares has strengthened approximately 13%.In recent years, along with the increase to low energy consumption heat exchanger demand, elliptical tube is applied gradually in industrial heat exchange device, but at frequency conversion CO
2teat pump boiler field is also in the exploratory stage at present, and it is best how the design of its fin shape and tube shape reaches, and industry, still in the exploratory stage, does not also find a kind of method for designing of the best at present.
[summary of the invention]
The invention is intended to address the above problem.By to fin shape and central tube shape enhanced heat exchange scheme experiment Analysis, a kind of best frequency conversion CO is proposed
2the method for designing of Teat pump boiler corrugated fin heat exchanger.
Technical scheme of the present invention is as follows:
A kind of frequency conversion CO
2the method for designing of Teat pump boiler corrugated fin heat exchanger, its heat exchanger fin 2 is shaped as corrugated, and its central tube is oval, it is characterized in that, and the minor axis of described oval central tube 1 is 0.6 – 0.8 with the ratio of major axis.
Described frequency conversion CO
2the method for designing of Teat pump boiler corrugated fin heat exchanger, is characterized in that, the spacing of described fin is (0.1-0.25) mm, and fin thickness is (0.2-0.3) mm.
Described frequency conversion CO
2the method for designing of Teat pump boiler corrugated fin heat exchanger, is characterized in that, the transverse pipe spacing between described oval central tube is (20-30) mm, and has identical equivalent diameter and the narrowest identical circulation of air area of section with pipe.
Beneficial effect of the present invention is, because the relevant parameter of selected central tube and fin is proper, can obtain best water heater enhanced heat exchange performance.
[Figure of description]
Fig. 1 corrugated fin heat exchange of heat pipe schematic diagram;
Fig. 2 elliptical tube corrugated fin zoning schematic diagram;
Fig. 3 Nu is with the variation of Re;
Fig. 4 air exit temp is with the variation of Re;
Fig. 5 heat exchange amount is with the variation of Re;
Fig. 6 Nu is with the variation to heart rate;
Fig. 7 f is with the variation to heart rate;
Fig. 8 Nu is with the variation of spacing of fin;
Fig. 9 f is with the variation of spacing of fin;
Figure 10 Nu is with the variation of fin thickness;
Figure 11 resistance f is with the variation of fin thickness;
Figure 12 Nu is with the variation of transverse pipe spacing;
Figure 13 resistance f is with the variation of transverse pipe spacing;
The Nu contrast of the different tube section shape of Figure 14 heat exchanger;
The f contrast of the different tube section shape of Figure 15 heat exchanger;
The Re contrast of the different tube section shape of Figure 16 heat exchanger.
[specific embodiment]
As depicted in figs. 1 and 2, the minor axis of oval central tube 1 and the external diameter of pipe are isometric, and other parameters are as follows:
The ratio of elliptical tube minor axis and major axis be shown in 0.6(Fig. 6, Fig. 7 experiment except);
Pipe row is 2;
Pipe external diameter is 10.55mm;
Transverse pipe spacing is in 25.0mm(Figure 12 except embodiment);
Longitudinal pipe spacing dzj=21.65mm;
Fin thickness is in 0.2mm(Figure 10 except embodiment);
Ripple inclination angle a=17.44 °;
Wavelength l=10.825mm;
The long lac=43.3mm of air-flow direction fin;
Elliptical tube minor axis la=10.55mm.
1, the heat exchange of elliptical tube and pipe corrugated fin heat exchanger and drag characteristic contrast
As shown in Figure 3, along with Re (Reynolds number) increases, the heat exchange property of pipe and elliptical tube has all obtained strengthening, and the heat exchange property of elliptical tube is always higher than the heat exchange property of pipe, and Re is higher, and the heat exchange property strengthening of elliptical tube is more.Because the tube-surface of elliptical tube is long-pending larger than pipe, the wake zone after pipe is less than pipe, and inner velocity ratio pipe is high, makes within the scope of calculated Re, and the heat exchange property of oval tube heat exchanger reaches as high as 30% than the strengthening of pipe heat exchange property.
The relativity of elliptical tube and pipe corrugated fin heat exchanger air exit temp and total heat exchange amount, seeing that Fig. 4, Fig. 5 can see with Re increases, the outlet temperature of the heat exchanger of two kinds of tube shapes all reduces, and the outlet temperature of oval tube heat exchanger is always high than pipe, illustrate that air is larger through the temperature rise of oval tube heat exchanger, heat transfer effect is better than pipe.The Changing Pattern reaction of outlet temperature, in heat exchange amount, increases with Re, and the heat exchange amount of two kinds of heat exchangers is all increasing, and the heat exchange amount of elliptical tube is always all high than the heat exchange amount of pipe, and Re is larger, and both difference are also just larger.
2, elliptical tube is to the impact of heart rate heat exchanging and resistance performance
Under the condition of Re=1000, heat exchange and the resistance performance of the oval tube heat exchanger of subtend heart rate in the excursion of 0.6-1.0 have carried out analog study.Oval minor axis length remains constant, shown in the following Fig. 6 of result, Fig. 7.
Along with the increase to heart rate, minor axis length moves closer in major axis, and elliptical tube changes to pipe, and the heat exchange property of heat exchanger reduces gradually.Owing to being subject to the restriction of physical model physical dimension, to heart rate minimum, can only get 0.6, and in this excursion, find that the best is to heart rate, but the variation tendency of figure, can reason out the best is 0.6-0.8 to heart rate.
To heart rate on the impact of drag characteristic as shown in Figure 7, in less to heart rate, f is with the increase to heart rate, fast-descending, and then, along with the increase to heart rate, downward trend slows down gradually.Along with the increase to heart rate, the shape of elliptical tube is more and more close to pipe, so the heat exchange of oval tube heat exchanger and resistance performance are also more and more close to pipe heat exchanger.
3, the impact of spacing of fin on oval tube heat exchanger heat exchange and resistance performance
Spacing of fin is on shown in the following Fig. 8 of impact, Fig. 9 of the Average heat transfer of elliptical tube corrugated fin heat exchanger and resistance performance.Spacing of fin excursion from 0.05 to 0.4 based on elliptical tube minor axis length, gets Re=1000, and corresponding speed of incoming flow is 0.927m/s.
Nu(nusselt number) with the variation relation of spacing of fin, referring to Fig. 8.When spacing of fin is during in 0.1 left and right, Nu reaches maximum, and along with spacing of fin is away from this optimum value, Nu declines gradually, and when spacing of fin is greater than 0.25, spacing of fin reduces gradually on the impact of Nu, substantially negligible.On the impact of f as shown in Figure 9, along with the increase of spacing of fin, resistance f dullness reduces spacing of fin, and in spacing of fin hour, the speed reducing is very fast, but when spacing of fin is greater than 0.25, spacing of fin further increases and almost no longer f exerted an influence.Thus, the optimum value of spacing of fin is (0.1-0.25) mm.
4, the impact of fin thickness on oval tube heat exchanger heat exchange and resistance performance
Fetching Flow Velocity is 0.928m/s, and result of calculation as shown in Figure 10, Figure 11.As shown in figure 10, Nu increases with fin thickness, but the trend increasing is more and more slow.It is mainly because fin thickness increases that Nu increases, and ventilation area is narrowed down, and air velocity increase causes.Resistance f increases along with the increase of fin thickness, as shown in figure 11, because air velocity, import blockage effect and outlet bulking effect all increase with fin thickness, makes f more and more steeper with the variation tendency of fin thickness.Experiment shows, best fin thickness is (0.2-0.3) mm.
5, transverse pipe spacing is on the heat exchange of elliptical tube corrugated fin heat exchanger and the impact of resistance performance
Nu along with the Changing Pattern of transverse pipe spacing as shown in figure 12.Transverse pipe spacing changes to 30.0mm from 10.0mm, other geometric parameters and identical above, and air speed of incoming flow is 0.927m/s.Along with the increase of transverse pipe spacing, the narrowest area of section of air side and air come the ratio of flow area also to increase, and air reduces at the flow velocity of narrow section.Along with transverse pipe spacing increases, the disturbance that elliptical tube causes for flowing is more and more less, and the temperature of fin surface is more and more lower, and worse and worse, therefore, Nu increases and reduces gradually with transverse pipe spacing the heat transfer effect of computing unit.When transverse pipe spacing is greater than after 30, more further increase tube pitch, will almost no longer affect heat exchange property.Figure 13 has represented the variation relation between f and transverse pipe spacing, and along with transverse pipe spacing increases, pipe is more and more less to the disturbance resistance of air, and f reduces gradually.
6, the corrugated fin heat exchanger of different tube section shapes flows and heat transfer characteristic comparison
Use 5 kinds of heat exchanger structure experiments, its difference is only that tube section shape is different, and other geometric parameters are in full accord.A heat exchanger is pipe, radius 5.3mm; The oval heat exchanger major and minor axis of B radius is 3.91:6.52; The oval heat exchanger major and minor axis of C radius is 4.11:6.85; The oval heat exchanger major and minor axis of D radius is 4.51:7.52; The oval heat exchanger major and minor axis of E radius is 5.11:8.52.
As shown in figure 14, elliptical tube shape more meets aerodynamic principle, the recirculation zone of elliptical tube pipe tail is reduced than pipe is obvious, and the heat exchange area of elliptical tube is also large than pipe.Therefore, the heat exchange property of 4 kinds of elliptical tubes is all good than pipe.Than pipe heat exchanger A, the heat exchange property of elliptical tube B has on average strengthened 12.3%, and the heat exchange property of elliptical tube C has strengthened 14.6%, and elliptical tube D has strengthened 17.0%, and elliptical tube E has strengthened 16.9%.The enhanced heat exchange performance of visible elliptical tube D and E is best, is then C and B successively.
As shown in figure 15, because elliptical tube profile more meets aerodynamic principle, make air flow through the pressure drop ratio pipe of elliptical tube little, therefore, except oval tube heat exchanger E, the f of other several oval tube heat exchangers is little than pipe.The f of elliptical tube E is higher than pipe, is mainly because less than pipe and other elliptical tubes at this oval tube heat exchanger inner air flow area of section, cause the mobile speed of its inner air and droop loss larger than other several heat exchangers, thereby f is also high than other heat exchangers.Than pipe A, the f of elliptical tube B, C, D has on average reduced respectively 23.9%, 20.7% and 17.0%, and the f of elliptical tube E has on average increased by 7.1%.For drag reduction, the effect of elliptical tube B is best, be then C and D successively, and elliptical tube E does not reach the effect of drag reduction, and its drag losses is more taller than pipe.
As shown in figure 16, with respect to pipe heat exchanger A, the comprehensive heat exchange property of oval tube heat exchanger B, C, D and E has been strengthened respectively 44.0%-52.9%, 40.7%-51.0%, 37.3%-47.6% and 5.6%-14.5%.From the combination property of enhanced heat exchange and energy-conservation drag reduction, consider, the performance of elliptical tube corrugated fin heat exchanger B with pipe with same circumference is best, is then the oval tube heat exchanger in same pipe area of section (C), same pipe equivalent diameter (D), the narrowest identical circulation of air cross section (E) successively.
Claims (3)
1. a frequency conversion CO
2the method for designing of Teat pump boiler corrugated fin heat exchanger, its heat exchanger fin (2) is shaped as corrugated, and its central tube (1) is oval, it is characterized in that, and the minor axis of described oval central tube (1) is 0.6 – 0.8 with the ratio of major axis.
2. a kind of frequency conversion CO as claimed in claim 1
2the method for designing of Teat pump boiler corrugated fin heat exchanger, is characterized in that, the spacing of described fin (2) is (0.1-0.25) mm, and fin thickness is (0.2-0.3) mm.
3. a kind of frequency conversion CO as claimed in claim 1 or 2
2the method for designing of Teat pump boiler corrugated fin heat exchanger, is characterized in that, the transverse pipe spacing between described oval central tube (1) is (20-30) mm, and has identical equivalent diameter and the narrowest identical circulation of air area of section with pipe.
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| CN201310749785.8A CN103759566A (en) | 2013-12-30 | 2013-12-30 | Method for designing corrugated fin heat exchanger for frequency conversion CO2 heat-pump water heater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015324A1 (en) * | 2014-08-01 | 2016-02-04 | 王良璧 | Streamline wavy fin for finned tube heat exchanger |
| CN110849176A (en) * | 2019-10-22 | 2020-02-28 | 邳州市蓝天节能建材有限公司 | Waste heat recovery device applied to heating system of civil building |
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2013
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| CN2089607U (en) * | 1990-05-28 | 1991-11-27 | 秦彪 | Wing of series sheet radiator |
| CN1158980A (en) * | 1995-01-23 | 1997-09-10 | Lg电子株式会社 | Fin tube heat exchanger |
| US20020088611A1 (en) * | 2001-01-05 | 2002-07-11 | Hde Metallwerk Gmbh | Heat exchanger for liquid and gaseous media |
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| 陶于兵: "CO_2家用空调系统实验研究及换热器强化换热数值模拟", 《中国博士学位论文全文数据库 工程科技II辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016015324A1 (en) * | 2014-08-01 | 2016-02-04 | 王良璧 | Streamline wavy fin for finned tube heat exchanger |
| US10982912B2 (en) | 2014-08-01 | 2021-04-20 | Liangbi WANG | Streamlined wavy fin for finned tube heat exchanger |
| CN110849176A (en) * | 2019-10-22 | 2020-02-28 | 邳州市蓝天节能建材有限公司 | Waste heat recovery device applied to heating system of civil building |
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Application publication date: 20140430 |