Research on simulation of coupled dynamic model of air conditioning system Part1: Significance and current problems of dynamic air conditioning system simulation

As for a current air-conditioning equipment design, it was given priority in the equipment capacity decision to process the maximum air-conditioning load. However, the majority of an actual air-conditioning load occupy by a low load, and are requested the air-conditioning equipment design that improves the system efficiency at a partial load. The Model-based design, which is a design development method based on simulation models, will streamline the design of optimum control that maximizes system efficiency. Dynamic air conditioning system simulation model needs to be examined since the current model cannot fully express transient characteristics. For example, the chilled water coil model is constructed by combining a dynamic HVACSIM+ TYPE602 model and a calculation method using the coefficient of the wetted surface. The calculation value and the actually measured value of temperature at the chilled water outlet were the same for the most flow rate region, but differed greatly in the low flow rate region. And those values of absolute humidity of supply air were also differed when the wetted surface was dried condition.