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The level of bilateral enhanced tubes in a single tube in the R134a Pool Boiling Heat Transfer Study

S-tube heat transfer coefficient of heat transfer coefficient formula Standon number (SiederandTate) a Reynolds number of the fluid: Ii} a thermal conductivity of the fluid within a hydraulic diameter of the largest 3 Conclusion In summary, the horizontal shell tube heat exchangers, the use of R134a, the following conclusions can be drawn: 1) increasing the evaporation tube the number of fins per unit length, outer wings cut roll formed after the crushing cavity density can improve their overall heat transfer performance; the same time outer wing rotary cutting crushing cavity formed shape,polo fred perry, opening size, uniformity of heat transfer on the tube has a greater impact. 2) The size of the opening in the control cavity under the premise of one-way process in improving the knurled hole on the export of uniformity knurled more favorable than the two-way, more suitable for use in mass production conditions. 3) Optimization of structural parameters of the tube can promote the improvement of heat transfer performance of tubes integrated,fred perry singapore, and the heating pipe and tube pressure drop of water to strengthen the structure parameters. 4) porous tube evaporator to strengthen bilateral research should focus on how to further improve the enhanced tube. 5) Analysis of single-tube experiments the results of the new high efficiency, energy saving, consumption of small heat exchanger design and development and reliable operation provides an important theoretical and engineering application value. Q-Tube sign that the overall heat transfer of a total based on nominal diameter of the heat transfer coefficient A. Based on the name of a nominal diameter of pipe area of △ £ a pair of logarithmic mean temperature difference (LMNT) £ an import export water temperature of a cylinder body of a refrigerant saturation temperature of a heat transfer tube of a nominal diameter of 32 within a body fluid r a physical characteristic Prandtl factor / correction coefficient of dynamic viscosity of a ‰ a mouth of the heat transfer coefficient, a saturation temperature corresponding to 6 g of a constant area of pipe based on nominal flux density of the fluid within the JD one of a hydraulic diameter of the tube on the tube velocity of the fluid of a heat exchange tube wall thermal resistance. Darcy (Darcy) friction factor. Factory = c × Re Reference Zhu Mingshan. 21 green refrigeration and air conditioning industry trends and prospects of refrigerant [J]. HVAC, 2OO0, 30 (2) :22-26. Yang Shiming, Tao Wen-Quan. f ~ - [M]. Beijing: Higher Education Press, 1998. EEWilson. Basisforrationaldesignofheattransferapparatus. TransAE ,1915,37-47. Zhu appointed crown. Principle and Calculation of heat exchanger [M]. Beijing: Tsinghua University Press, 1987. FWDittus, LMKBoelter. UnivCalif (Berkeley) PubEng, 1930,2:443. OUYANG Xin Ping and so on. Modified Wilson method in the Shell and Tube Heat Exchanger Performance Test [J]. Industrial boilers, 1999 (1) :24-26. WebbRL. Principlesofenhancedheattransfer. NewYork: J0hnWiley & Sons,fred perry, Inc ,1994,373-426 ,482-501. DarabiJ,christian louboutin shoes, SalehiM, SaeediMH, eta1. ReviewofavailablecorrelationsforpredictionofflowboilingheattransferinsmootlIandaugmentedtubes. ASHRAETrans. 1995.101:965-9r75. Nakayama, W. JHeatTransfer. 1980,102:445-450. Fujikake. US, 4216826 【P1.1980-08-12. Saier. US, 479911IP1.1979-12-25. Saier. US, 4168618 [P]. 1980-09-25. StephallK. AdvancesinEnhancedHeatTransfer. AE, 1981. Lin Zonghu. Heat transfer and its application [M]. Beijing: Mechanical Industry Press, 1987. Dong Tianlu and so on. Centrifugal,gorras ed hardy, screw chiller and its application [M]. Beijing: Mechanical Industry Press, 2003. Qian Song Wen and so on. Tube heat exchanger heat transfer technology [M]. Beijing: Chemical Industry Press. 20O2. Marto, PJ. JHeatTransfer, 1966,88,183. Just r = l correct b '! Innn' = Innnn

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