Sunday, January 29, 2017: 8:00 AM-9:00 AM
Fundamentals and Applications
Chair:
Martin Dieryckx, Daikin Europe NV
Sponsor: Refrigeration Committee
In view of the requirement to reduce the climate impact of refrigerants, several refrigerants are proposed for use in direct expansions air-conditioning systems. There are test programs such as AREP and PRAHA to evaluate some of the solutions. The results of these tests do not always give the straight answer that we expect. How should we read these results and what parameters are most important to decide the refrigerant for the specific application. This workshop has the target to give a better insight how the next generation refrigerant can be decided for direct expansion AC equipment.
1 Study on Properties of Low GWP Refrigerants
This study explains the differences in thermo-physical and other properties of alternatives that affect performance of direct (Air cooled) AC system. Thermo-physical cycle, pressure losses, heat transfer and thermal losses are discussed. Reasonable saturation pressure of refrigerant is necessary to avoid poor energy efficiency.
2 Analysis of Test Results on Low GWP Refrigerants
Test results with new refrigerants in actual systems vary considerably leading to initial uncertainty about the relative merits of the new fluids. Factors that influence measured performance as compared to theoretical expectations are presented and their relative impact and sensitivity is discussed.