?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 沈阳中央空调工程减少室内热负荷的设计方法 - 沈阳碧然机电设备有限公司-ΧƱ-ҳ
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沈阳中央空调工程减少室内热负荷的设计方法

发布时间?015-01-06

?)遮?br />

  减少阳光直接辐射屋顶、墙、窗及透过窗户进入室内,可采用挑檐、遮阳板(篷)、镀膜玻璃等;减轻外墙、屋面吸收阳光幅射热,可采用浅色外墙饰面,将绝热层设在外墙外侧和屋顶屋面,或架空屋面?br />

  增加外遮阳对夏季冷负荷(或供冷量)减少十分明显。据中国建筑科学研究院测定,在水泥屋面刷上石灰水,夏季屋面的表面温度可降?6-19℃?br />

  ?)气?br />

  提高门窗气密性,防止缝隙进风。采用塑钢门窗不仅气密性好,而且热阻大,并可降低噪音,减少灰尘。或采用门窗密封条,提高门窗气密性。房间换气次数由 8 降到5次,建筑物的耗冷可降?%左右?br />

  因此设计中应采用密闭性良好的门窗。加设密闭条是提高门窗气密性的重要手段。根据门窗的具体情况,分别采用不同的密封条。如橡胶条、塑料条或橡塑结合的密封条?br />

  ?)绝?br />

  采用绝热材料对墙、屋顶、门窗等进行绝热,如岩棉、矿渣棉、玻璃棉、聚苯乙烯泡沫塑料、膨胀珍珠岩、加气混凝土、聚氨酯硬质泡沫塑料、PVC塑料门窗、中空玻璃等,以减少围护结构的传热系数。采用空心砌块、二层窗等,利用空气隔热,也可起到绝热作用。增设外墙及屋顶的保温层对冬、夏两季节能有利?br />

  ?)控制窗墙比


    窗墙比是窗洞口与墙的面积比值,增大这个比值不利于空调建筑节能。通过外窗的耗热量占建筑物总耗热量的35%?5%.一般规定各朝向的窗墙比不得大于下列数字:北?5%;东、西面向30%;南?5%.

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