Question

A 84 W freezer has an EER of 10.4. How much heat is exhausted to the room in 4.2 hours?
(include units with answer)

Answer 1

Note : Energy Efficiency Rating (EER) is an efficiency rating used to know the systems performance on a cooling system

Given data :

freezer input power = 84 W

Energy Efficient rating (EER) =10.4

Heat exhausted to room in time duration = 4.2 hrs

Calculations :

Energy Efficient Rating(EER) = Cooling output (BTU/hr)/Energy input(w)

Cooling output capacity = EER*Energy input

=10.4*84  

Cooling Output capacity  = 873.6 (BTU/hr)

( note: 1 Watt = 3.412 BTU/hr )

so , 84 Watts = 84*3.412 BTU/hr

Input power = 286.608 BTU/hr

Total heat exhausted to the room in Hours = (cooling output capacity  + power input )*Hours

= (873.6+286.608)* 4.2

=(1160.208BTU/hr)*4.2 hr

=4872.873 BTU

Hence total heat exhausted to the room in 4.2 hrs = 4872.873 BTU