Abstract
Measurements of cooling capacity and coefficient of performance (COP) for R12, R22 and mixtures of propane and butane as refrigerants have been carried out on a test rig with a nominal capacity 45 kW at 0 deg. C evaporation temperature and 50 deg. C condensing temperature with R12 as refrigerant. Results show that the same capacity can be achieved with R22 as with R12 if the speed of the compressor with R22 is reduced to approximately 2/3 of the speed of the compressor working with R12. COP is slightly higher with R22. The discharge pipe temperature is between 15 K and 30 K higher with R22. The compression ratio is 10% higher with R22. All the measurements with mixtures have a lower COP than R12. 100% propane gives approximately 60% higher pressure, 100% iso-butane gives approximately 50% lower pressure, whereas 100% n-butane gives approximately 70% lower pressure in the evaporator and condensor then R12. For binary mixtures, a pressure between these values is obtained. The swept volume for the propane, n-butane and propane iso-butane mixtures will be between 30% less and 200% larger than the swept volume for R12. For the pure refrigerants roughly the same COP is obtained as
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Citation Formats
Hoegaard Knudsen, H J.
Substitution of R12 with R22 and with mixtures of propane and butane. Experimental investigation; Substitution af R12 med R22 samt med blandinger af propan og butan; Eksperimentel undersoegelse.
Denmark: N. p.,
1993.
Web.
Hoegaard Knudsen, H J.
Substitution of R12 with R22 and with mixtures of propane and butane. Experimental investigation; Substitution af R12 med R22 samt med blandinger af propan og butan; Eksperimentel undersoegelse.
Denmark.
Hoegaard Knudsen, H J.
1993.
"Substitution of R12 with R22 and with mixtures of propane and butane. Experimental investigation; Substitution af R12 med R22 samt med blandinger af propan og butan; Eksperimentel undersoegelse."
Denmark.
@misc{etde_10128471,
title = {Substitution of R12 with R22 and with mixtures of propane and butane. Experimental investigation; Substitution af R12 med R22 samt med blandinger af propan og butan; Eksperimentel undersoegelse}
author = {Hoegaard Knudsen, H J}
abstractNote = {Measurements of cooling capacity and coefficient of performance (COP) for R12, R22 and mixtures of propane and butane as refrigerants have been carried out on a test rig with a nominal capacity 45 kW at 0 deg. C evaporation temperature and 50 deg. C condensing temperature with R12 as refrigerant. Results show that the same capacity can be achieved with R22 as with R12 if the speed of the compressor with R22 is reduced to approximately 2/3 of the speed of the compressor working with R12. COP is slightly higher with R22. The discharge pipe temperature is between 15 K and 30 K higher with R22. The compression ratio is 10% higher with R22. All the measurements with mixtures have a lower COP than R12. 100% propane gives approximately 60% higher pressure, 100% iso-butane gives approximately 50% lower pressure, whereas 100% n-butane gives approximately 70% lower pressure in the evaporator and condensor then R12. For binary mixtures, a pressure between these values is obtained. The swept volume for the propane, n-butane and propane iso-butane mixtures will be between 30% less and 200% larger than the swept volume for R12. For the pure refrigerants roughly the same COP is obtained as with R12, whereas the mixtures give a COP up to 25% lower than with R12. For greater differences between brine and coolant temperature, a coefficient of performance up to 50% lower is found. The discharge temperature for isentropic compression for propane is approximately 3 K lower than for R12, whereas iso-butane and n-butane give a discharge temperature at isentropic compression approximately 14 K lower. For mixtures the discharge temperature at isentropic compression can be either higher or lower than for R12. (AB)}
place = {Denmark}
year = {1993}
month = {Nov}
}
title = {Substitution of R12 with R22 and with mixtures of propane and butane. Experimental investigation; Substitution af R12 med R22 samt med blandinger af propan og butan; Eksperimentel undersoegelse}
author = {Hoegaard Knudsen, H J}
abstractNote = {Measurements of cooling capacity and coefficient of performance (COP) for R12, R22 and mixtures of propane and butane as refrigerants have been carried out on a test rig with a nominal capacity 45 kW at 0 deg. C evaporation temperature and 50 deg. C condensing temperature with R12 as refrigerant. Results show that the same capacity can be achieved with R22 as with R12 if the speed of the compressor with R22 is reduced to approximately 2/3 of the speed of the compressor working with R12. COP is slightly higher with R22. The discharge pipe temperature is between 15 K and 30 K higher with R22. The compression ratio is 10% higher with R22. All the measurements with mixtures have a lower COP than R12. 100% propane gives approximately 60% higher pressure, 100% iso-butane gives approximately 50% lower pressure, whereas 100% n-butane gives approximately 70% lower pressure in the evaporator and condensor then R12. For binary mixtures, a pressure between these values is obtained. The swept volume for the propane, n-butane and propane iso-butane mixtures will be between 30% less and 200% larger than the swept volume for R12. For the pure refrigerants roughly the same COP is obtained as with R12, whereas the mixtures give a COP up to 25% lower than with R12. For greater differences between brine and coolant temperature, a coefficient of performance up to 50% lower is found. The discharge temperature for isentropic compression for propane is approximately 3 K lower than for R12, whereas iso-butane and n-butane give a discharge temperature at isentropic compression approximately 14 K lower. For mixtures the discharge temperature at isentropic compression can be either higher or lower than for R12. (AB)}
place = {Denmark}
year = {1993}
month = {Nov}
}