Gray internal forecasting of loads of building hygrothermal system

This paper simply states conventional and special forecasting methods, and discusses the difference between two kinds of uncertain theories, that is, stochastic and gray system one. The uncertainty of the Building Hygrothermal System (BHS) is analyzed. BHS is regarded as a gray system. Gray prediction model, GM(1,1), is depicted. A method, Upper-Lower Limitation Lines Method (ULLLM), based on gray predicting model and gray plane is proposed. Building loads for a certain example is predicted by using the above method. By inspecting, predicting values of a certain year just fall into predicting gray interval, as completely reflects non-only principle of gray system theory, and verifies that the gray plane built by UDLLM is feasible and correct. The method is important to operation and management of air-condition equipment.