Question

I Review Part A A Carnot freezer that runs on electricity removes heat from the freezer compartment, which is at -10°C and expels it into the room at 25°C. You put an ice-cube tray containing 425 g of water at 12 Cinto the freezer. What is the coefficient of performance of this freezer? 90 AXPO 2 ? K- Submit Request Answer Part B How much energy is needed to freeze this water? Assume at the end of the process all the water is converted to ice at 0°C Express your answer with the appropriate units. I HA O 2 ? 1Qc) = Value Units Submit Request Answer Part How much electrical energy must be supplied to the freezer to freeze the water? Assume at the end of the process all the water is converted to ice at O'C. Express your answer with the appropriate units.

Answer 1

Freezer at -10°c Room at as c. water (ursg) at 12°c A coefficient of perfomance k = Te TH-TC = 263 998-263 = 7.514 B. The cuergy needed to freer the water de = meattmL = 0-425 X4 15x10°(12-0) + (0-:25) Y( 334 xolkg) =21369 + 141950 = 16 3319 = 163.3287033 Gi Electrical energy supplied to foreezes is, wz Qc = 163319 = 21735.3 7.514 W=2.17X104y - 5 The weat does freezer emped into som is. Qu= dctw - 163319 +2173513 = 1185x1053