Question

In: Physics

The Kwik-Freez Appliance Co wants you to design a food freezer that will keep the freezing...

The Kwik-Freez Appliance Co wants you to design a food freezer that will keep the freezing compartment at -5.00?C and will operate in a room at 20.0?C. The freezer is to make 5.80kg of ice at 0 ?C, starting with water at 20.0?C.

a) Find the least possible amount of electrical energy needed to make this ice

b) Find the smallest possible amount of heat expelled into the room.

Expert Solution

I have solved this question earlier with different figures. Please workout using yours figures. If you need any further help just PM me. If I have helped you please rate me 5 stars first (before you rate anyone else)

The Kwik-Freez Appliance Co wants you to design a food freezer that will keep the freezing compartment at -5.00?C and will operate in a room at 20.0?C. The freezer is to make 4.20kg of ice at 0 ?C, starting with water at 20.0?C.

Find the least possible amount of electrical energy needed to make this ice.

Find the smallest possible amount of heat expelled into the room.

For thesmallest amount of electrical energy:

Q_in=(4.20kg)(4190J/kg*K)(20K) +(4.20kg)(334*10³J/K)

Q_in=1.76*10⁶

Carnotcycle:

Qin / Tcold = Qout / Thot

1.76 x 10^6 / 268 = Qout / 293

Qout =

Q_out =1.92*10⁶ J (into the room)

W =Q_out - Q_in =1.92*10⁶ J -1.76*10⁶ J

W =0.16*10⁵ J (electrical energy)

genius_generous answered 6 months ago

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