You have a refrigeration plant that makes ice in the summer to supply grocery stores. You maintain the cold room where the ice is made at -10F, and your heat exchanger that transfers heat to the outside air operates at an average temperature of 100 F. The head of fusion fo water is -143 Btu/lbm.
If you make 100 tones of ice per month (1 month = 30 days), what is the minimum power requirement of your refrigeration unit? Give your answer in units of horsepower (Note: 1 ton = 2,000 lbm)