In this paper , a image processing method has been presented , with this method mean temperature of testing object can be arrived at from infrared picture and the interior temperature gradient of the test pieces in the situation of transient heat transfer can be got . unsteady - state heat transfer mechanism of wall has also been studied in this paper . on the basis of theoretical analysis and experimental study we can get such conclusions : infrared testing of energy conservation of buildings is rapider and more accurate than heat - flow meter method which is popular at present ; heat transfer mechanism in the situation of unsteady - state heat transfer has been analyzed through experiment ; the interior layers ’ temperature of the test pieces ascent in company with 本文在理論分析和試驗(yàn)研究的基礎(chǔ)上得出以下結(jié)論:本文研究的紅外檢測建筑節(jié)能的方法比目前存在的熱流計(jì)法更快速、更準(zhǔn)確;用試驗(yàn)分析了墻體在非穩(wěn)態(tài)傳熱情況下的傳熱機(jī)理;試件各層溫度隨著受熱面環(huán)境溫度的上升而上升,只是上升的程度不同,響應(yīng)時(shí)間不同,這是由于試件內(nèi)部有一個(gè)蓄熱過程;通過傳熱理論和建筑熱工計(jì)算推導(dǎo)出了非穩(wěn)態(tài)傳熱情況下的傳熱系數(shù)的計(jì)算公式;本文用matlab進(jìn)行紅外圖片的處理,進(jìn)而得到被測物的平均溫度;用數(shù)據(jù)處理軟件擬合溫度熱流。