1. A refrigerator is used to maintain a freezing space at 1 degree celsius by absorbing heat from the
freezing space when the environment temperature is 20 degrees celsius. The freezing space
supplies heat at a rate of 1000 kJ/s and condenser removed heat at a rate of 500kJ/s to
environment and refrigerator conumes 50kW of electric power when runnning. Is this
refrigerator powerful enough to do this job? If no, what is the minimum power consumption for
this job?
Refrigerator operating on reversible cycle consumes minimum work (or power).
please show work and steps. Thank you.
Solution
No the refrigerator is not powerful enough for the job
Since the condenser removes heat at only half the rate the freezing air supplies heat
The power of frig should be doubled so that condenser removes heat at twice the original rate =
1000 kj/s same as supplied by air
Hence power of frig should be 2* 50kW = 100kw