建筑围护结构热性能指标OTTV的研究与应用

Research and implementation of the thermal performance index(OTTV)of building envelope

透过建筑围护结构进入空调建筑的得热量是构成建筑空调负荷的重要组成部分,很多国家通过立法设立标准来控制建筑围护结构的热工特性以达到建筑节能的目的。围护结构总传热值(overall thermal transfer value,OTTV)是综合考虑墙体、屋顶及窗户热特性及太阳透过窗户热辐射得热的建筑围护结构性能指标。这一指标最早由美国提出,在东南亚及中国香港地区得到的一定的发展及应用并被列入国家或地区标准。中国大陆地区依然采用传热系数、窗墙比等参数控制建筑围护结构的设计。因此,本文回顾OTTV的发展与应用,以期开展OTTV在我国应用方面的研究。

Heat gained through building envelope including fenestration, exterior walls and roofs etc. is a big part of the building air conditioning load. Many countries have established standards or codes to control the thermal characteristics of building envelope for building energy saving. Overall thermal transfer value（OTTV） of building envelope is a building envelope thermal performance index integrating the thermal characteristics of exterior walls/roofs, fenestration and the solar heat gained through fenestration. This index was firstly introduced in US and then was developed and implemented in some southeast Asian countries and Hong Kong of China. In China, heat transfer coefficient, window-towall ratio etc. are still used for the design of building envelope. Reviews the development and implementation of OTTV with the aim to conduct the application study of OTTV in our country.