poor heat transfer 中文意思是什麼
poor heat transfer
解釋
熱傳遞不良-
The spacing between each sheet of glass is important - if it is too narrow, the insulation effect will be poor ; if it too wide, convection currents may encouraged, which increase heat transfer
每片玻璃之間的距離是非常重要的? ?如果間距太小，保溫隔熱性能就很差；間距太大，對流增強，熱傳遞增多。 -
The disadvantage is that the coefficient of heat transfer is iow and the utilization factor is poor and the drying time so long. moreover because of the defect of structure, it can not be in conformity with the requirements of " gmp ". in order to overcome the shortcoming, we edsigned and developed the penetrating air stream box type drier on the basis of absorbing abroad advanced technology
在傳統的水平流廂式乾燥器中，氣流只在物料表面流過，其缺點是傳熱系數低、熱利用率差、物料乾燥時間長且由於結構的缺陷，無法完全符合「 gmp 」藥品生產規范。為了克服以上缺點。 -
The bigger the diameter, the high the heat efficiency, but the weak the temperature increasing ability, length has less effect on the heat efficiency, tilt angle has less effect on the flow field and temperature field while it is larger than 30 degree, vacuum degree and emissivity have great effect on the flow field and temperature field while there is a great temperature difference between the liquid in the tube and the surroundings, the furring has less effect on the heat transfer but should be cleaned up in 3 - 5 years because of poor water quality, the higher the solar flux or the more the temperature difference between the liquid and the surrounding, the more the heat loss and the lower the heat efficiency
分析了各種因素對太陽能真空集熱管流場和溫度場的影響。直徑越大，熱效率越高，但升溫能力弱；長度對熱效率影響不大；傾斜角度大於30后，自然對流已經能夠充分進行，考慮以能夠吸收到最大太陽輻射為主；真空度和發射率對熱效率和溫度場影響很大，尤其是在介質溫度與環境溫度差異比較大時；水垢對傳熱影響較小但由於水質的問題應該被3 5年清洗一次；太陽輻射強度越大，介質溫度與環境溫度差異越大，熱損失越大，效率越低； 4
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