PASCO ET-8782 Energy Transfer– Thermoelectric - Manual (Page 38)

Energy Transfer –Thermoelectric Teachers’ Notes–Coefficient of Performance
38 ®
Reversible Heat Pump
This sample data is in the file “Coeff of Performance Data Heat Pump”.
6)
7) If you used a simple resistor to heat the block with the same amount of work, the maximum
heat transferred to the block would be W = 48.4 J.
8) The peltier represents the heat pump, the cold block represents the outside air, and the hot
block represents the interior of the building.
9) The coefficient of performance must be greater than 1 in order for the heat pump to be more
efficient than a simple heater. A simple heater supplied with 100 J of electrical energy would
transfer 100 J of heat to the building. A heat pump with k = 2 supplied with 100 J of electrical
energy would transfer 200 J to the building.
Q
hot
= kW
k
116.6 J
48.4 J
----------------- 2.41 = =