中空玻璃(li)的安裝角(jiao)度

　　一般(ban)情況下，中(zhong)(zhong)空(kong)玻(bo)(bo)璃(li)都是垂(chui)直放(fang)置(zhi)使(shi)用，目前(qian)中(zhong)(zhong)空(kong)玻(bo)(bo)璃(li)的(de)應用范(fan)圍越(yue)來越(yue)廣(guang)泛，如果應用于(yu)溫室(shi)或斜坡屋(wu)頂時(shi)(shi)(shi)，其(qi)角(jiao)度(du)(du)將會(hui)發生改(gai)(gai)變(bian)(bian)(bian)。當角(jiao)度(du)(du)變(bian)(bian)(bian)化(hua)時(shi)(shi)(shi)，內部氣(qi)體的(de)對流狀態(tai)也會(hui)隨之(zhi)而改(gai)(gai)變(bian)(bian)(bian)，這必(bi)將影響氣(qi)體對熱(re)量的(de)傳遞(di)效果，最終導致中(zhong)(zhong)空(kong)玻(bo)(bo)璃(li)的(de)傳熱(re)系數發生變(bian)(bian)(bian)化(hua)。以常用的(de)6+12+6白玻(bo)(bo)空(kong)氣(qi)填充組合形(xing)式(shi)為(wei)(wei)例(li)，圖6-19顯(xian)示(shi)了(le)不(bu)同角(jiao)度(du)(du)的(de)中(zhong)(zhong)空(kong)玻(bo)(bo)璃(li)K值變(bian)(bian)(bian)化(hua)情況(注:受不(bu)同角(jiao)度(du)(du)范(fan)圍采用不(bu)同的(de)計算公式(shi)影響，圖中(zhong)(zhong)數據僅供分析(xi)參(can)考(kao))，常用的(de)垂(chui)直放(fang)置(zhi)(90") 狀態(tai)K值為(wei)(wei)2.70W/(m2●K),水平放(fang)置(zhi)(0°)時(shi)(shi)(shi)K值為(wei)(wei)3. 26W/(m2●K)，增加了(le)21%。所以，當中(zhong)(zhong)空(kong)玻(bo)(bo)璃(li)被水平放(fang)置(zhi)使(shi)用時(shi)(shi)(shi)，必(bi)須考(kao)慮K值變(bian)(bian)(bian)大對建筑節(jie)能(neng)效果的(de)影響。但(dan)應注意圖6-19中(zhong)(zhong)的(de)K值變(bian)(bian)(bian)化(hua)趨勢(shi)是指在(zai)室(shi)內溫度(du)(du)大于(yu)室(shi)外(wai)溫度(du)(du)的(de)環境條件(jian)下，相(xiang)反條件(jian)時(shi)(shi)(shi)變(bian)(bian)(bian)化(hua)并不(bu)明(ming)顯(xian)。