Medium-temperature supermarket refrigeration conversion from CFC-12 to HCFC-22 (R-12 to R-22)
The Electric Power Research Institute (EPRI) has undertaken a project to investigate the best approach for the conversion of medium-temperature supermarket refrigeration from R-12 (CFC) to R-22 (HCFC) so that the maximum energy-savings benefit can be realized by its member utilities and their customers. Such conversions will be necessary as CFCs are phased out. In this report, two medium temperature display case circuits at the EPRI/Safeway test store were converted. Single, large semihermetic, and open-drive compressors were tested. The large semihermetic and open-drive compressors were also equipped with cylinder unloaders and variable-speed drive so that either method of capacity control could be employed. The results of the testing showed that conversion to R-22 produced energy savings and that large semihermetic compressors with re-expansion unloaders were a viable alternative to single compressors in this application. Computer model results suggested that conversion of all medium-temperature refrigeration from R-12 to R-22 would result in peak demand savings of 5.3 kw (9.3%) and annual energy savings of 37,595 kWh (10.5%). Additional savings are possible by incorporating energy-efficient features such as floating head pressure control, condenser resizing to enable it to operate at a lower temperature, and high-efficiency condenser fan motors. Guidelines and procedures for energy-efficient retrofit are outlined.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Foster-Miller Associates, Inc., Waltham, MA (United States)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 7084197
- Report Number(s):
- EPRI-TR-101265
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CHLOROFLUOROCARBONS
AIR POLLUTION ABATEMENT
COMMERCIAL BUILDINGS
ENERGY EFFICIENCY
REFRIGERANTS
MATERIAL SUBSTITUTION
HYDROCARBONS
MANAGEMENT
REFRIGERATION
REFRIGERATORS
BUILDINGS
COOLING
EFFICIENCY
FLUIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION ABATEMENT
WORKING FLUIDS
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)