张明星

曹小林

欧阳琴

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29   32008 6   54Journal of RefrigerationVol.29,No.3June. 20080253 4339 2008 03 0054 04            410083      5%   TU831.4; U270.38+3                                                      AMechanism of Enhancing Heat Transfer Performance of Automobile Air conditioner Evaporator Plating with Hydrophilic FilmCao Xiaolin   Zhang Mingxing   Ouyang QinSchool of Energy Science and Engineering, Central South University, Changsha, 410083, ChinaAbstract  The heat transfer process of automobile air-conditioner evaporators with/without hydrophilic film was analyzed. It is suggested that hydrophilic  lm can affect the heat transfer performance of automobile air-conditioner evaporators from three aspects, i.e., effective heat transfer area, heat transfer coefficient and temperature difference. Effective heat transfer area coefficient was proposed and measured experimentally. A mathematical model was established to simulate the heat transfer processes of both the evaporator plating with hydrophilic  lm and the one without hydrophilic  lm, and the model was veri ed by experiments. The results show that the heat transfer coef cient decreases but effective heat transfer area and temperature difference increase, and thus the total heat transferred increases by 5% for the evaporator plating with hydrophilic  lm.Keywords  Engineering thermophysics; Heat transfer performance; Hydrophilic  lm; Automotive air conditioner2007 7 20[1] 1~2 [2] L.S. Fletcher[3]1  1.1  15529   32008 6Vol.29,No.3June. 2008a                       ba without hydrophilic fi lm         b with hydrophilic fi lm1  Fig.1  Diagram of water bridge and water  lm on evaporator plating1.2  1AhAf  20.82~0.86 0.842  Fig.2  The distribution of condensation water bridge on evaporator without hydrophilic  lm  12  2.1  2h uq dAr v lx =12.2  3At Af Ta Tw1  4[2]5jN N ColburnumaxCp Pr[4]678iw LeWa Ws,min29   32008 6   56Journal of RefrigerationVol.29,No.3June. 2008Ts,min 2Chi Chuan Wang[2]5[2]9 Dh 10Amin A0 L 2.3  11Ta1Ta212p12   13K A13Ta2 3  /36%[5]3  /Fig.3  Comparison of airside heat transfer coef cient with/without hydrophilic  lm4  /Fig.4  Comparison of model to experiment data of heat transfer with/without hydrophilic  lm4 /6%3%5% Mimaki[6]2%~3%5729   32008 6Vol.29,No.3June. 20084  1/2320% 6%5%[1]  . [J]. , 1997, 7 : 151 154. Pang xin, Gan Weiping, Ji Dongyin. Anti corrosive and hydrophilic coatings on aluminum fin materials for air conditioner[J]. 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Mechanism of Enhancing Heat Transfer Performance of Automobile Air-conditioner Evaporator Plating with Hydrophilic Film

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Mechanism of Enhancing Heat Transfer Performance of Automobile Air-conditioner Evaporator Plating with Hydrophilic Film

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