This paper describes experimental and modelling studies on a secondary refrigerant calorimeter, slightly modified in design but with more instrumentation than a standard calorimeter, having the objective of the simultaneous determination ofaverage evaporative heat transfer coefficients and cycle COP. Results are given for two pure component refrigerants, R134a and R22, and two binary non-azeotropic mixtures of R22 and R142b in the proportions by mass 60:40 % for the first mixture and 40:60% for the second mixture over a range operating conditions.
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