Modelling of a shell-and-tube evaporator using the zeotropic mixture R-407C

This study concerns the steady state modelling of a shell-and-tube evaporat or using the zeotropic mixture R-407C. In this local type model, the contro l volumes are a function of the geometric configuration of the evaporator i n which baffles are fitted. The validation of the model has been made by co mparison between theoretical anti experimental results obtained from an exp erimental investigation with a refrigerating machine. For test conditions, the flow, pattern has been identified from a flow pattern map as being stra tified. Theoretical results show the effect of different parameters such as the saturation pressure, the inlet quality, etc. on the local variables (t emperature, slip ratio). The effect of leakage on the mixture composition h as also been investigated. (C) 2001 Elsevier Science Ltd and IIR. All right s reserved.