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Title: Alternative refrigerants and refrigeration cycles for domestic refrigerators

Abstract

This project initially focused on using nonazeotropic refrigerant mixtures (NARMs) in a two-evaporator refrigerator-freezer design using two stages of liquid refrigerant subcooling. This concept was proposed and tested in 1975. The work suggested that the concept was 20% more efficient than the conventional one-evaporator refrigerator-freezer (RF) design. After considerable planning and system modeling based on using a NARM in a Lorenz-Meutzner (L-M) RF, the program scope was broadened to include investigation of a ``dual-loop`` concept where energy savings result from exploiting the less stringent operating conditions needed to satisfy cooling, of the fresh food section. A steady-state computer model (CYCLE-Z) capable of simulating conventional, dual loop, and L-M refrigeration cycles was developed. This model was used to rank the performance of 20 ozone-safe NARMs in the L-M refrigeration cycle while key system parameters were systematically varied. The results indicated that the steady-state efficiency of the L-M design was up to 25% greater than that of a conventional cycle. This model was also used to calculate the performance of other pure refrigerants relative to that of dichlorodifluoromethane, R-12, in conventional and dual-loop RF designs. Projected efficiency gains for these cycles were more modest, ranging from 0 to 10%. Individual compressor calorimetermore » tests of nine combinations of evaporator and condenser temperatures usually used to map RF compressor performance were carried out with R-12 and two candidate L-M NARMs in several compressors. Several models of a commercially produced two-evaporator RF were obtained as test units. Two dual-loop RF designs were built and tested as part of this project.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Environmental Protection Agency, Washington, DC (United States)
OSTI Identifier:
10184084
Report Number(s):
ORNL/M-2270
ON: DE93040481
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Dec 1992
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; REFRIGERANTS; MATERIAL SUBSTITUTION; REFRIGERATORS; TESTING; FREEZERS; DESIGN; FABRICATION; AIR POLLUTION ABATEMENT; OZONE LAYER; ENERGY EFFICIENCY; COMPUTER CALCULATIONS; ORGANIC COMPOUNDS; 320302; 320107; 540120; MATERIALS; BUILDING SYSTEMS; CHEMICALS MONITORING AND TRANSPORT

Citation Formats

Sand, J.R., Rice, C.L., and Vineyard, E.A.. Alternative refrigerants and refrigeration cycles for domestic refrigerators. United States: N. p., 1992. Web. doi:10.2172/10184084.
Sand, J.R., Rice, C.L., & Vineyard, E.A.. Alternative refrigerants and refrigeration cycles for domestic refrigerators. United States. doi:10.2172/10184084.
Sand, J.R., Rice, C.L., and Vineyard, E.A.. Tue . "Alternative refrigerants and refrigeration cycles for domestic refrigerators". United States. doi:10.2172/10184084. https://www.osti.gov/servlets/purl/10184084.
@article{osti_10184084,
title = {Alternative refrigerants and refrigeration cycles for domestic refrigerators},
author = {Sand, J.R. and Rice, C.L. and Vineyard, E.A.},
abstractNote = {This project initially focused on using nonazeotropic refrigerant mixtures (NARMs) in a two-evaporator refrigerator-freezer design using two stages of liquid refrigerant subcooling. This concept was proposed and tested in 1975. The work suggested that the concept was 20% more efficient than the conventional one-evaporator refrigerator-freezer (RF) design. After considerable planning and system modeling based on using a NARM in a Lorenz-Meutzner (L-M) RF, the program scope was broadened to include investigation of a ``dual-loop`` concept where energy savings result from exploiting the less stringent operating conditions needed to satisfy cooling, of the fresh food section. A steady-state computer model (CYCLE-Z) capable of simulating conventional, dual loop, and L-M refrigeration cycles was developed. This model was used to rank the performance of 20 ozone-safe NARMs in the L-M refrigeration cycle while key system parameters were systematically varied. The results indicated that the steady-state efficiency of the L-M design was up to 25% greater than that of a conventional cycle. This model was also used to calculate the performance of other pure refrigerants relative to that of dichlorodifluoromethane, R-12, in conventional and dual-loop RF designs. Projected efficiency gains for these cycles were more modest, ranging from 0 to 10%. Individual compressor calorimeter tests of nine combinations of evaporator and condenser temperatures usually used to map RF compressor performance were carried out with R-12 and two candidate L-M NARMs in several compressors. Several models of a commercially produced two-evaporator RF were obtained as test units. Two dual-loop RF designs were built and tested as part of this project.},
doi = {10.2172/10184084},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 1992},
month = {Tue Dec 01 00:00:00 EST 1992}
}

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