Small-size constant-frequency water chilling unit variable water temperature control method based on chilled water return temperature optimal setting point

The invention relates to a small-size constant-frequency water chilling unit variable water temperature control method based on a chilled water return temperature optimal setting point. The small-sizeconstant-frequency water chilling unit variable water temperature control method based on the chilled water return temperature optimal setting point comprises the steps of firstly building a model ofa small-size constant-frequency water chilling unit air conditioner system, and carrying out analog simulation; collecting design parameters of a building and typical annual meteorological data of alocation, and combining the model, the design parameters and the typical annual meteorological data for calculating to obtain chilled water return maximum allowable temperature under different operating work conditions; checking and correcting the chilled water return maximum allowable temperature so as to determine the water return temperature optimal setting point and build different operating working condition data sets;