[Difficulty: 2]
Problem 1.32
Given:
Equation for
COP
ideal
and temperature data.
Find:
COP
ideal
,
EER
, and compare to a typical Energy Star compliant
EER
value.
Solution:
Use the COP equation.
Then use conversions from Table G.2 or other sources (e.g., www.energystar.gov) to
find the EER.
The given data is
T
L
20
273
+
(
) K
⋅
=
T
L
293 K
⋅
=
T
H
40
273
+
(
) K
⋅
=
T
H
313 K
⋅
=
The COP
Ideal
is
COP
Ideal
293
313
293
−
14.65
=
=
The EER is a similar measure to COP except the cooling rate (numerator) is in BTU/hr and the electrical input (denominator) is in W:
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 Fall '07
 Lear
 Fluid Mechanics

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