Quasi-steady state model of an ice rink refrigeration system |
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Authors: | Lotfi Seghouani Nicolas Galanis |
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Affiliation: | (1) Département de Génie mécanique, Université de Sherbrooke, Sherbrooke QC, Canada |
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Abstract: | A quasi-steady model for the refrigeration system of an indoor ice rink was developed based on a combination of thermodynamic
relations, heat transfer correlations and data available in the manufacturer’s catalogue. The system includes five compressors,
rejects heat to the ambient air and uses R-22 to keep a stream of brine at a temperature of approximately −9°C. The model
has been validated by comparison with measured values and with data from the manufacturer’s catalogue. It was then used to
simulate its performance over a typical meteorological year. Results for a representative day include the number of compressors
in operation at any given moment, their power consumption, the coefficient of performance (COP) of the cycle and of the system,
as well as the heat rejected by the condensers and the corresponding mass flow rate of the cooling air. They show that the
evaporation pressure is essentially constant while the condensation pressure varies from about 1600 to 2000 kPa. The COP of
the system varies between 1.9 and 2.5. Results for the entire year show that the heat rejected during phase change is approximately
four times that due to desuperheating and demonstrates the interest of recovering heat from both processes. Finally, the model
is used to illustrate the advantages of a control strategy which limits the maximum number of simultaneously operating compressors
to four. This strategy results in a 10% decrease of the energy used by the compressor motors and a 20% decrease of the peak
power demand but increases the temperature of the brine at the exit from the chillers by approximately 0.5°C during short
periods following the ice resurfacing operations. |
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Keywords: | refrigeration system heat exchangers ice rink thermal load energy efficiency |
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