Answer Problem 8.2 under the assumption that 8 of the 12 people doing heavy labo

Question

Answer Problem 8.2 under the assumption that 8 of the 12 people doing heavy labor and 2 foremen-maintenance personnel come to work when the others are leaving and that 3000 Watts of extra lighting are required for the night shift. A 20-ton air conditioning unit has an EER of 9.3. What is the COP of that unit? What is the kW/ton for that unit? How many kW of input power does that unit draw when it operates at full load mechanical cooling? Florida Electric Company offers financial incentives for large customers to replace their old electric motors with new, high efficiency motors. Crown Jewels Corporation, a large customer of FEC, has a 20-year-old 100 HP motor that they think is on its last legs, and they are considering replacing it. The motor has a load factor of 0.6. Their old motor is 91% efficient, and the new motor would be 95% efficient. FEC offers two different choices for incentives: either a $6/HP

Explanation / Answer

solving 8.4

we can find out input electrical power = (output cooling power in BTU/h) / EER

input power = (5 x 12000) / 9.3 = 6451.6 W = 6.45 kW.

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