|On a hot day, the freezers in a particular ice cream shop maintain an average temperature of T=-19° C while the temperature of the surroundings is Th= 26° C.
|On a hot day, the freezers in a particular ice cream shop maintain an average temperature of T=-19° C while the temperature of the surroundings is Th= 26° C.
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Transcribed Image Text:On a hot day, the freezers in a particular ice cream shop maintain an average
temperature of T.=-19° C while the temperature of the surroundings is T= 26° C.
Т. —-19° С
Th
= 26° C
TH
W
To
Calculate the maximum coefficient of performance COP for the freezers.
COPC
If the power input to the freezer is P = 3.15 kW and the freezer actually removes Q. = 11.1 × 10³ J from the ice cream each second, what is
COP =
An employee puts m= 2.95 kg of melted ice cream at To= 1.5° C into the freezer. Assuming that the ice cream freezes at T1=-1.0° C, how
long in seconds will it take for the ice cream to reach its freezing temperature? Take the specific heat capacity of the melted ice cream as c = 4,000.0 J/(kg-K).
Atj :
Assuming a latent heat of fusion of Lf= 280 kJ/kg, how long, At,, in seconds does it take to freeze the ice cream?
An = |
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