Computational Fluid Dynamics (CFD) modeling is effectively coupled with the experimentaludtechnique of Digital Particle Image Velocimetry (DPIV), to study the flowfieldudcharacteristics and performance of the air curtain of a medium-temperature open verticaludrefrigerated display case used in supermarkets. A global comparison of the flowfield andudquantification of the entrained air into the case indicate that there is a considerableudamount of cold air spillage from a typical display case that is replaced by the ambientudwarm entrained air across the air curtain, lowering the energy efficiency of the case. Theudcomputational model that is developed from the marriage of CFD and DPIV techniquesudprovides a reliable simulation tool that can be used for the design optimization of airudcurtains. A correct estimate of the infiltration rate by changing different parameters in audvalidated computational simulation model will provide a feasible tool for minimizing theudspillage of the cold air, and thereby designing more energy efficient open display cases.
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