Question 17 A Heat Pump With The Cop Of 2 1 Supplies Heat At The Rate Of 135 Kj Min If A Bar Heater Was Used And The El 1 (35.66 KiB) Viewed 13 times
Question 17 A Heat Pump With The Cop Of 2 1 Supplies Heat At The Rate Of 135 Kj Min If A Bar Heater Was Used And The El 2 (39.1 KiB) Viewed 13 times
QUESTION 17 A heat pump with the COP of 2.1 supplies heat at the rate of 135 kJ/min. If a bar heater was used and the electricity cost R2.50 per kWh peak and 200 cents off-peak , how much would be saved using the heat pump for 7 days if the off-peak hours are from 22:00 hr to 6:00 hr for every day of the week. Provide the answers to 2 decimal places and insert the unit in Rands after the answer. QUESTION 22 A refrigeration system is to be used to constantly maintain a space at -15°C in an industrial cooling space. The estimated cooling rate of 87270 kJ/h when the outside temperature is 26°C. Determine the minimum power required to drive this refrigerator if analysis is based on Carnot cycle. Provide answer to 2 decimal places and insert the unit symbol in kW. insert minus in answer and use 1°C=173 K if necessary.
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