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Energy and Environment, 1995

ISBN Imprimer:
1-56700-052-5

A STUDY ON THE REFRIGERANT CHARGE OF REFRIGERATOR-FREEZER

GuoLiang Ding
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

ChunLu Zhang
Department of Refrigeration & Cryogenics Engineering Shanghai Jiao Tong University

ZhiJiu Chen
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai

Résumé

The refrigerant charge is an important parameter for the thermodynamic conditions of a small-scale refrigeration appliance. This paper analyzes the relationships among the amount of refrigerant charge and other running parameters of refrigerator-freezer such as pressures and temperatures. In order to choose a proper void fraction correlation for the description of two-phase flow conditions, an experiment is done and the results show that Premoli correlation underestimates the charge and Hughmark correlation overestimates the charge for a refrigerator-freezer. As the Premoli correlation and Hughmark correlation are both complex, a simplified correlation is used in the system simulation. How to use the void fraction correlation for dynamic simulation of a refrigerator is also discussed.