A dynamic approach for the modeling,simulation and analysis of no-frost Refrigerator(RF) is dis- cussed.In PartⅠ,the complex interactions among the components in the cooling system are analyzed in detail, based on which the modeling simplifications are proposed.Then,the mathematical models for the evaporator, cabinet and duct-fan are presented.The whole system is divided into two subsystems--refrigerant cycling system and air cycling system.In order to simplify the model,two closed-loop systems are broken into the compressor component and the evaporator component,respectively.A general distributed parameter model is employed for evaporator with homogeneous flow to simplify the two-phase evaporating flow region.The z-transfer function model is used to describe the cabinet load.Computational fluid dynamics(CFD) method is employed to obtain the pressure drop and flow rate curve of the duct-fan model.
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