Abstract
The formation of frost causes a decrease in the heat exchanger performance because of increased thermal resistance. In this study, the performance of a refrigeration system in a refrigerator truck with frost growth was determined and the performance characteristics were analyzed considering the indoor and outdoor temperature, outdoor air velocity, and compressor rotating speed. As a result, under frost growth conditions, refrigeration capacity was decreased by 30.4% when the operating time passed by 3 hours which had a blocking ratio of 40.1%. In addition, the mass flow rate was decreased, but the pressure ratio was increased with an increase in frost thickness, leading to a decrease in the refrigeration capacity and COP. The maximum system COP was found at a compressor rotating speed of 1500 rpm: 2.30 and 1.86 for a blocking ratio of 0% and 40.1%, respectively. It gradually decreased over 1500 rpm.
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Abbreviations
- de:
-
equivalent diameter
- D:
-
diameter, m
- Dc :
-
displacement, m
- Fr:
-
Froude number
- h:
-
enthalpy, kJ/kg
- k:
-
conductivity
- \(\dot m\) :
-
flow rate, kg/s
- N:
-
compressor rotating speed, rpm
- P:
-
pressure, kPa
- Q:
-
cooling capacity, kW
- Sp :
-
piston stroke length, m
- Tf :
-
frost layer surface temperature, K
- W:
-
compressor work
- We:
-
weber number
- x:
-
quality
- Xtt :
-
martinelli parameter
- η :
-
isentropic efficiency
- ρ″:
-
″/″
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Kim, S.H., Kim, T.J., Shin, Y.C. et al. Simulation study on refrigeration performance under frost condition in a R404A refrigerator truck type. Int.J Automot. Technol. 16, 387–397 (2015). https://doi.org/10.1007/s12239-015-0040-3
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DOI: https://doi.org/10.1007/s12239-015-0040-3