建筑围护结构传热系数现场检测装置研制

An In-situ Test Apparatus of Heat Transfer Coefficient for Building Envelope

建筑围护结构传热系数检测是建筑节能检测中的重要项目,为在现场准确测量围护结构的传热系数,将用于实验室测试围护结构传热系数的热箱法与用于现场测试的热流计法结合起来,设计并制作了现场检测围护结构传热系数的实验装置。热箱能够人为控制室内检测环境,使室内外温度差达到检测要求,弥补了热流计法只能在采暖季节测试的不足,提高了检测效率及准确度。通过对某建筑物墙体进行了现场检测,实验结果表明该现场检测装置测试时间短、准确度高。现场检测得到的传热系数比理论计算值高约55%,建议将建筑围护结构的现场检测结果和理论计算值作为评价其节能效果的综合指标。

The measurement of heat transfer coefficient of building envelope is an important project in building energy efficiency test. In order to accurate measure the heat transfer coefficient in situ, the field test experimental apparatus of heat transfer coefficient for building en- velope was designed and manufactured by combining the hat-box method and heat-flow meter method. The inside test environment can be ar- tificially controlled by the hat-box to achieve the requirement of temperature difference of each side. The drawback of heat-flow method that the in-situ test must be carry out in heating season was made up by the apparatus, thus the test efficiency and accuracy are also improved greatly. The heat transfer coefficient of a wall for a building was in-situ measured. The experimental results showed that the apparatus has the advantage of shorter testing time and higher accuracy. The in-situ test result is about 55 percent higher than theoretical value. It is rea- sonable to take field test results and theoretical values as the comprehensive index to evaluate the energy-saving effect to building envelope.