Performance of a residential heat pump operating with a non-azeotropic binary refrigerant mixture - an interim report. [R22 vs non-azeotropic binary mixture of R13B1 and R152a]
This report presents results of laboratory measurement of the performance change of a substantially unmodified residential heat pump designed for R22 when charged with a non-azeotropic, binary mixture of R13B1 and R152a. Results are presented for various sizes of fixed expansion devices. The effect of gliding temperature in the saturation zone was found to be small. The effect of composition shift by flash distillation in the accumulator was found to measurably improve low temperature heating performance. There appears to be an inherent trade-off when operating an unmodified heat pump with mixtures so as to increase capacity at lower temperatures. This trade-off is that as the evaporator pressure decreases and refrigerant begins to flood through to the accumulator and thus allowing the composition shift to occur, the subcooling on the high pressure side also decreases causing a decrease in the available latent enthalpy difference. A possible solution to this problem might be to increase the amount of initial charge. This would cause on increase in head pressures which could be a problem in the cooling mode. A possible solution to this excessive head pressure problem would be to incorporate a receiver in the system in the branch line just ahead of the expansion device for the outdoor coil. Thus, when this coil is acting as an evaporator (i.e., heating mode) the stored refrigerant would be released into the circulating system allowing for more composition shift to occur. Such a solution will be pursued as one of the items of study during the next phase of this project. 9 refs., 11 figs., 1 tab.
- Research Organization:
- National Bureau of Standards, Washington, DC (USA). Building Equipment Div.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5743762
- Report Number(s):
- CONF-841231-16; ON: DE85005245
- Resource Relation:
- Conference: DOE/ORNL heat pump conference, Washington, DC, USA, 10 Dec 1984; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR SOURCE HEAT PUMPS
COMPUTERIZED SIMULATION
WORKING FLUIDS
RESIDENTIAL BUILDINGS
CAPACITY
EFFICIENCY
NUMERICAL DATA
RELIABILITY
BUILDINGS
DATA
FLUIDS
HEAT PUMPS
INFORMATION
SIMULATION
320100* - Energy Conservation
Consumption
& Utilization- Buildings