Building thermal process analysis with grey system method

To enable the calculations of heat transfer through envelope without complete weather information, the authors present the grey system method to analyze building thermal process. Grey relation analysis is used to select thermal disturbances with great influence for modelling. Grey models for solar radiation and outdoor air temperature are proposed. Through matrix transformation, the intervals of loads and room air temperature can be calculated. Finally, some approaches to improve the reliability are proposed. For the indefiniteness of thermal comfort, satisfactory solutions with intervals rather than precise ones with fixed points present meaningful results for the designing of thermal environment.