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现行 KC-2842(RP-253)
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Control Strategies for Minimum Energy Usage 最低能耗控制策略
进行了一项实验研究,以表征雷诺数、空气湿度、空气温度和平板温度对平行流几何中垂直平板上霜生长和霜密度的影响。试验条件限于板温度10至23°F(5至12°C),空气湿度比0.00382至0.00514 lb/lba(kg/kga),雷诺数4400至32400,空气温度41至54°F(5至12°C)。在平板上的六个位置测量霜冻生长,而在两个位置测量霜冻密度。当雷诺数小于15900时,霜冻增长随雷诺数的增加而增加。 在这个雷诺数以上,霜冻增长与雷诺数无关。霜的生长强烈依赖于换热器板的温度和空气湿度。气温对霜冻生长的影响很小。建立了霜冻高度与时间、雷诺数、平板温度和空气湿度的经验关系。霜密度随时间和雷诺数的增加而增加。朝向板块前部的霜冻比朝向板块后部的霜冻密度更大。霜冻密度随空气湿度、空气温度和平板温度的变化很小。 引用:ASHRAE Transactions,1984年,第90卷,第。密苏里州堪萨斯城2A
An experimental investigation was undertaken to characterize the effect of Reynolds number, air humidity, air temperature, and plate temperature on frost growth and frost density on a vertical plate in a parallel flow geometry. Test conditions were limited to plate temperatures from 10 to 23°F (–5 to –12°C), air humidity ratios from 0.00382 to 0.00514 lb/lba (kg/kga), Reynolds numbers from 4400 to 32400, and air temperatures from 41 to 54°F (5 to 12°C). Frost growth was measured at six locations on the plate while frost density was measured at two locations.Frost growth increased with increasing Reynolds numbers for Reynolds numbers less than 15900. Above this Reynolds number, frost growth showed no dependence on the Reynolds number. Frost growth was found to be strongly dependent on the heat exchanger plate temperature and the air humidity. Air temperature had only a minor effect on frost growth. An empirical correlation relating frost height to time, Reynolds number, plate temperature, and air humidity was developed.Frost density increased with time and with Reynolds number. Frost toward the front of the plate was more dense than toward the rear. Frost density showed only small variation with air humidity, air temperature, and plate temperature.
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