Research On The Inspection Error Caused By Environmental Conditions For Heat Flow Meter Method

The energy conservation in building is a long-term national policy. For energy conservation inspection and evaluations, the overseas focuses on process control. Our country has also made some standards for process control. But, it is necessary to do in-situ energy efficiency inspection for building, especially for the enclosure as it is complicated. Furthermore, it plays an important role in analyzing the real energy consumption of the building and reflecting the problems in the period of construction.This dissertation researching on the Heat Flow Meter method which is used in in-situ thermal performance inspection of building enclosure, compiles a program to calculate the unsteady heat transfer model. In allusion to the result, it analyzes the influence of the inspection method, which is caused by the index of thermal inertia, the solar radiation, the wind speed and the temperature difference between indoor and outdoor.The results show that:1. The heat flow meter put on the internal surface can reduce the testing errors caused by the index of thermal inertia. But the relative error is as large as 30%, which can be reduced to smaller than 5% after modification.2. Taking the inspection on the northward wall can't eliminate the errors caused by the solar radiation. The relative error is 18.7%～58.3%, which can be reduced to about 5% after modification.3. The results which are obtained when the wind speed is a little big should be modified, for minimizing the influence of the wind speed.4. The temperature difference between indoor and outdoor should be at 15～ 20℃. When the temperature difference control is difficult, the error correction is feasible. And the relative error can be reduced from about 30% to nearly 2%.