文档介绍：Performance of R-438A in
R-22 Refrigeration and
Air Conditioning Systems
Dr. Charles C. Allgood1, C. Curtis Lawson2
1DuPont Fluorochemicals,
Wilmington, DE, USA
E-mail: -******@usa.
2DuPont Fluorochemicals,
Wilmington, DE, USA
E-mail : C-Curtis.******@usa.
ABSTRACT
With the accelerated phase out of R-22 underway, equipment R-438A (ANSI/ASHRAE, 2009) is a non-ozone depleting zeotropic
owners and service contractors must develop a plan for blend of HFC-32, HFC-125, HFC-134a, HC-600, and HC-601a
operating, retrofitting, or replacing their existing R-22 (// wt%, respectively) which has been
refrigeration and air conditioning systems. In many cases, formulated to provide a versatile, cost effective alternative
retrofitting the existing R-22 equipment to an alternative refrigerant to replace R-22 in existing direct expansion (DX)
refrigerant is a viable, cost effective option for the equipment refrigeration and air conditioning systems. This paper will review
owner. R-438A is a non-ozone depleting hydrofluorocarbon (HFC) properties and performance characteristics of R-438A, and report on
refrigerant blend which can be used to retrofit existing experimental results with R-438A pressor calorimeter tests,
hydrochlorofluorocarbon (HCFC) refrigerant R-22 refrigeration and system performance and oil return tests, and actu