heat emissivity 中文意思是什麼

heat emissivity 解釋
熱發射率
  • heat : n 1 熱；熱力；熱度；熱量。2 體溫；發燒。3 （氣候的）高溫，暑氣。4 【冶金】熔煉的爐次；裝爐量；一...
  • emissivity : n. 發射率，輻射系數。
  1. In short, through retrieving the parameter such as surface albedo, surface temperature and surface emissivity, all the energy flux such as net radiance flux, soil heat flux and latent heat flux can be computed in sequence further, then latent heat flux which provide energy for et can be computed based on energy balance equation, finally instantaneous et and daily et can be obtained

    總之，根據地表能量平衡方程，通過計算對地表反照率、地表溫度、地表比輻射系數、歸一化植被指數等參數進行反演，進一步計算出了地表凈輻射通量，土壤熱通量和潛熱通量，最後獲得了遙感影像成像時的瞬時蒸散及當天的總蒸散量。
  2. Theoretical analysis and experimental results showed that the high emissivity coating speeds up the heat - absorption and heat release process, strengthens heat transfer by radiation and heat conduction in the regenerator, improves heat transfer efficiency and the blast temperature

    理論分析和實驗結果表明，熱風爐蓄熱體表面高發射率塗層可以提高蓄熱體的蓄熱和放熱能力，強化爐內輻射傳熱和蓄熱體的導熱，從而提高熱風溫度。
  3. The length should be added if the cost is n ' t increased and the installation is convenient, the diameter should be chose by the local weather condition and the using requirement ; the gas pressure should be not higher than 5 x 10 - 2pa and the emissivity should be less than 0. 1, the spring should be small and narrow in order to decrease the heat loss, the gas absorbed getter should not be too many as long as it can absorb the residual gas and keep the vacuum degree

    在不影響安裝和增加成本的情況下，應適當增加太陽能真空集熱管的長度;根據當地的氣候條件和使用要求來綜合考慮選擇直徑;國標規定的真空度必須達到5x10 』 zpa ，發射率小於0 . 1是合理的;彈簧卡子不要選用很寬、很大的尺寸，盡量減少接觸熱損;吸氣劑並非越多越好，只要能夠吸收殘余氣體，保證一定的真空度即可。
  4. 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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