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New folding type of fin tube heat exchanger in broken air conditioner

About 40. In order to determine the air Oh l newly developed surface heat exchanger heat transfer coefficient, using a method that is unstable ladder to change into fin air temperature before and after successive measure the temperature of the air through the fins, and then through the calculation you can find the air side heat transfer coefficient of the surface of a heat exchanger air side heat transfer coefficient of the equivalent stability of a free method to measure heat transfer coefficient was then calculated according to the following formula a: a = _-mouth】 - a (a + R) where: LU - wing coefficient of 0 - water side heat transfer coefficient (kW / mk) t one by one contact resistance (in.k, kW) is shown in Figure 8, the newly developed thermal exchanger finned tube heat exchanger with strip SUI to the comparison. It can be seen from Figure 8, whether a. Or a, using the new form of broken wings folded wing than the strip can be improved by about j0. In addition, newly developed heat exchanger in the dry condition of the ventilation resistance △ p strip fin heat exchanger than the low resistance I5%, but when placed vertically in the wet conditions the ventilation resistance is similar between the two, This was mainly due to water droplets under gravity more easily under-ping, but when placed in the level of development of new folding fin shape the role of the thin edge surface of the water droplets to flow more easily. Fold in the article on the wing-shaped fin height b also made out of the ventilation resistance and heat transfer. When the fin pitch sr = i. 5mm out when the height h j of the test species (see Figure l0), ie b =】. 0, mouth. 75 and】. mm of the situation. It can be seen from the graph only in the h - @. 75mm equivalent heat transfer coefficient when the fin Q decreased,[link widoczny dla zalogowanych], while that kind of height j under the same air resistance. In determining fold out wings shaped fin height h in the article should be whichever h)】, 2 is appropriate, such as when the film taken from a swollen to 1.5 h = 1.0 or】. mm is appropriate. One,[link widoczny dla zalogowanych], one by one, two plastic''* ~ I 1. Ugly face with, vIc) lII8 Alice newly developed air Rage and strip hot line to shake the vote compared to rely on face Ken pregnancy is v,, Figure 9 dry conditions and set conditions of the air side resistance of steel is hand it off Figure 10 Disconnect the selected shape on heat transfer and a high degree of interest in the impact resistance of 6. Conclusion Hitachi from Japan in L995) of folding on the development of cutting-shaped wings and a small diameter (Tram) thread tubes of finned tube heat exchanger fins and the bar than the original use of large diameter (9.53mm ) thread tubes, fin tube heat exchanger both within and outside the tube in tube heat transfer coefficient have been greatly improved. Therefore, 2 row tube evaporator, heat transfer in that the same case could be the thickness of the original Lu = 43. jmm thin base for the port 25. Omm, about 40 can be thinned. f}. Executive /. Reference i-melting I (slightly) of Heat oven operating characteristics of the Department of Mechanical Engineering, Nanjing University of Chemical Technology, Nanjing Li Qingsheng barrier desiccant each depot evil Shen Shao industry TkI. 『, A summary of this paper, the calculation of the heat pump drying hoop and analysis of heat pump drying suitcase morning drying process of experimental research, that the dry heat pump water blasting hip hoop Lian said drying air temperature and circulation of air relative humidity Genan and Genan ; single energy in the dehumidification cycle than sPC certain relative humidity of air Tianfeng an optimal drying temperature and circulation makes sPC Air Pu said most of the plow on the humidity of the smaller wind. _ Lian was a best degree of drying more pills. Heat pump technology to x. i-~ expected to dry up in recent years the development of an obvious and practical energy-saving effect of a new drying method. At present, the domestic heat pump drying technology applied more in the field of wood drying, and heat pump drying of development and research is still very little relevant literature. Conventional oven drying are electric or steam to heat the air to reduce the relative air temperature, then heat the air used to dry materials, heat the air absorbs the moisture of materials to be dried, the small back in the box,[link widoczny dla zalogowanych], and must Most of the air exhaust fan is discharged to the environment to direct out, obviously in a lot of heat in the exhaust process is lost. If you can drain the condensation of water vapor in the air to its saturation temperature below, it condenses into water and drain, and its latent heat and dry air recycling, this will greatly improve the efficiency of drying, and significant savings the energy consumption of the drying process, this can be used to dry heat pump technology. I. Working principle of heat pump drying technology is the air circulation in the oven, circulating the air - in part through the heat pump evaporator, absorbing material in the drying chamber and the discharge of water condensation precipitation outside the oven,[link widoczny dla zalogowanych], when the air contains wetlands is greatly reduced,[link widoczny dla zalogowanych], then the air flows through the condenser, the heat pump in turn in the evaporator absorbs the heat and the wet air compressor power consumption of the heat into the air circulation transmits it back together in order to enable circulation of air The temperature rose to 5O ~ 6O ℃, relative humidity

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