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theown1
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Homework Statement
An air conditioner operates on 800W of power and has a performance coefficient of 2.80 with a room temperature of 21oC, and an outside temperature of 35oC.
a) Calculate the rate of heat removal for this unit.
b) calculate the rate at which heat is discharged to the outside air.
c) calculate the total entropy change in the room if the air conditioner runs for 1 hour. Calculate the total entropy change in the outside air for the same time period.
d) What is the net change in entropy for the system(room+outside air)?
Homework Equations
[tex]\Delta[/tex]Q=cm[tex]\Delta[/tex]T
I think that that is the equation of heat lost
Coefficient of performance = Qcold, input/Winput
C.o.P=Qcold,input/(Qhot,output-Qcold,input)
The Attempt at a Solution
a) I'm not sure how to find the rate of heat which is removed
b) I'm not sure either
c) I know that Entropy=Q/T, and
[tex]\Delta[/tex]S=mcln(Th/Tc)
c is the specific heat, m is mass
but I'm not sure how to find the final temperature from what's given in the problem, or the mass...
d) once I know the answer to part C, its fairly self explanatory
Can someone guide in the right direction for solving this