Record Display for the EPA National Library Catalog


Main Title Testing of Refrigerant Mixtures in Residential Heat Pumps.
Author Hwang, Y. ; Judge, J. F. ; Radermacher, R. ;
CORP Author Maryland Univ., College Park. Center for Environmental Energy Engineering.;Environmental Protection Agency, Research Triangle Park, NC. Air Pollution Prevention and Control Div.
Publisher Oct 95
Year Published 1995
Report Number EPA-R-819710; EPA/600/R-95/157;
Stock Number PB96-113733
Additional Subjects Refrigerants ; Heat pumps ; Environmental chemical substitutes ; Performance testing ; Mixtures ; Coefficient of performance ; Performance evaluation ; Alternatives ; Residential buildings ; Energy efficiency ; Air pollution abatement ; Ozone depletion ;
Library Call Number Additional Info Location Last
NTIS  PB96-113733 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 138p
The report gives results of an investigation of three possibilities for replacing the refrigerant HCFC-22 (Hydrochlorofluorocarbon-22) with the non-ozone-depleting new refrigerants R-407D and R-407C in residential heat pumps. The first and simplest scenario was a retrofit with no hardware modifications (drop-in). The second possibility investigated required altering the refrigerant path to attain a near-counterflow configuration in the indoor coil for the heating mode. The third and most complex possibility was optimization consisting of adjusting the refrigerant charge and expansion devices. Each modification progressively improved refrigerant performance. Study results show that the system should be optimized, rather than simply dropping in the new refrigerant, because replacing the HCFC-22 by dropping in R-407D or R-407C degrades performance.