Simulation and Performance of a System Using an R-12/R-114 Refrigerant Mixture

摘要

The objective of this combined analytical and experimental study is to determine energy conservation possibilities through the use of a refrigerant mixture in a refrigerator or heat pump. The system is one with two evaporators that are operated at different temperatures levels, and the basic approach was to maintain constant refrigeration loads and temperatures throughout a series of tests wherein the composition of the refrigeration mixture was altered. The experimental measurements consisted of the determination of temperatures and pressures throughout the system, energy flow rates and compressor power, and boiling and condensing heat-transfer coefficients as the fraction of R-114 in the mixture varied from 0.0 to 0.6. In order to maintain the fixed refrigeration capacity in the two evaporator and decreased through the condenser as is expected for a refrigerant mixture. System simulation predicted an 8 percent saving in compressor power for an optimum 68 percent R-114 mixture (of R-12/R-114) in comparison to R-12 alone. The experimental results at this stage show about a 2 percent reduction in power in the range 10 to 15 percent R-114 in the mixture. (ERA citation 09:033524)