A cooler is used to cool water from 30°C to 5°C. The cooler has steady- flow, and the mass flow rate of water is 1 ??/?.  The cooler emits 146.3 kW  of heat to the atmosphere. The coefficient of performance of the cooler is 2.5.  How much electrical work is required to run the cooler?  The specific heat of water is 4.18 ?? /?? ∙ ?.

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The following data for the R-12 refrigeration system as shown are as follows: Evaporator 1 0 OC 30 TOR Evaporator 2 -10OC 20 TOR Evaporator 3 -20OC 10 TOR Condenser 20OC Assume simple saturation and isentropic compression and determine the following: a) Draw the h-s diagram b) The refrigerant flow in each evaporator c) Total work of compression, WC in kW d) Heat rejected in the condenser, QR in kj/min e) Coefficient of performance