Energy saving calculation method of air conditioning system energy saving retrofit based on similar day method

Similar day method is usually used to calculate energy saving amount of air conditioning system retrofit. It has stringent requirements on the indoor cooling load and outdoor temperature, requiring less than 3% of daily cumulative cooling load and average temperature difference before and after energy retrofit. There are multiple similar days in actual operation, and the amount in energy saving of different similar days varies greatly, sometimes there will be even not similar day, resulting many problems for energy saving calculation and hindering the development of energy industry. Presents a method of energy saving calculation based on multivariate regression analysis, verifies the correctness of this method based on measured data of multiple projects, solving the problems of having multiple similar days or no similar day in a month in calculating energy saving.