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�p���v��In general, it is said that the window is an element which thermal resistance is small and the rate of the heat flow through it is large in the elements of the building. Therefore, improvement of thermal performance of the window is an urgent issue from the viewpoint of the global warming prevention. The thermal performance of the window has been evaluated by laboratory test, but it is very difficult to check for all types of windows because there exists a huge combination of sizes, frames and glazings. For this reason, JIS A2102 which stipulates the calculation method based on ISO 10077 will be published in March 2011. Though the validity of this standard has been roughly confirmed for windows of normal size in Japan, we have few findings for those of smaller or larger than normal size. Thus there is concern about a possible discrepancy between measured and calculated performance of a smaller or larger size window. This project conducted the verification test to clarify the size effect and the obtained data were analyzed for reviewing the standard by the incorporation of a correction method. We mainly investigated the following two topics.
(1) Verification test of varied sizes
The thermal performance test of 12 combination cases of four types of frames (aluminum, aluminum resin compound, resin and wood) and three sizes of fixed windows (large size: 1690W�~2070H, normal size:1690W�~1370H and small size:1690W�~570H) was conducted based on JIS A4710. These results were compared with calculated results based on JIS A2102. The measured results correspond to the calculated results for normal size windows with high accuracy. However, the difference between measured and calculated results increases at smaller or larger sizes.
(2) Development of the device for measuring the distribution of the heat transfer coefficient
It is assumed to cause the size effect by the influence of the distribution of heat transfer coefficient. Because of this, we developed the device for measuring the distribution of heat transfer coefficient. This device consists of a PVC frame, an exothermic double glazing, and 40 sheets of 300mm square heat flow meters which are tiled on both surfaces of the glass. Moreover, several trial measurements were conducted to confirm that the distribution of the heat transfer coefficient can be determined by means of this device. In addition, a round robin test using this device is planned for the coming year.
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