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狗 BIRMINGHAM CITY University SECTION A (Answer ALL questions from this section) 1. A refrigerator with a COP rating of 5
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狗 BIRMINGHAM CITY University SECTION A (Answer ALL questions from this section) 1. A refrigerator with a COP rating of 5
狗 BIRMINGHAM CITY University SECTION A (Answer ALL questions from this section) 1. A refrigerator with a COP rating of 5 cools a refrigerated space requiring a peak cooling rate of 40 000 kJ/h. Determine in horsepower the size of the electrical motor needed for this refrigerator given that 1 hp = 745.7 W. 15 marks) 2. A power plant burns 1500 kg of coal each hour and produces 650 kW of power. Determine the overall thermal efficiency if 1 kg of coal produces 5 MJ of energy. 15 marks hun
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