Question

1. You need design a freezer that will keep the temperature inside a -5.0 C and will operate with a temperature inside at 5.0 C and will operate in a room with a temperature of 22.0 C. The freezer is to make 20.0 kg of ice at 0.0 C starting with water at 20.0 C. For water, the specific heat is 4190 J/kg-K, the heat of fusion is 333 kj/kg.

a. How much energy must be removed from the water to cool it from 20.0 C to 0.0 C water?

b. How much energy must be removed from the 0 C water to convert it to -5 C ice?

c. What is the maximum possible coefficient of performance of the freezer?

Answer #1

500g of water at temperature of 15°C is placed in a
freezer. The freezer has a power rating of 100W and is 80%
efficient.
1- Calculate the energy required to convert the water
into ice at a temperature of -20°C.
2- How much energy is removed every second from the air
in the freezer?
3- How long will it take the water to reach a
temperature of -20°C?
4- Explain the process that cools the air in the
freezer.
5-...

A cube of ice is taken from the freezer at -6.5 ?C and placed in
a 85-g aluminum calorimeter filled with 300 g of water at room
temperature of 20.0 ?C. The final situation is observed to be all
water at 17.0 ?C. The specific heat of ice is 2100 J/kg?C?, the
specific heat of aluminum is 900 J/kg?C?, the specific heat of
water is is 4186 J/kg?C?, the heat of fusion of water is 333 kJ/Kg.
a)What was the...

A cube of ice is taken from the freezer at -5.5 ∘C and placed in
a 85-g aluminum calorimeter filled with 300 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 16.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333 kJ/Kg.
What was the...

A cube of ice is taken from the freezer at -8.5 ∘C and placed in
a 85-g aluminum calorimeter filled with 320 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 15.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333
kJ/Kg.

A cube of ice is taken from the freezer at -9.5 ∘C and placed in
a 95-g aluminum calorimeter filled with 320 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 15.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333
kJ/Kg.
What was the...

A cube of ice is taken from the freezer at -8.5 ∘C and placed in
a 85-g aluminum calorimeter filled with 320 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 15.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333 kJ/Kg.
What was the...

A freezer has a coefficient of performance of 2.60. The freezer
is to convert 1.86 kg of water at 26.0 ∘C to 1.86 kg of ice at
-5.00 ∘C in 1 hour.
a) What amount of heat must be removed from the water at 26.0 ∘C
to convert it to ice at -5.00 ∘C ?
b) How much electrical energy is consumed by the freezer during
this hour?
c) How much wasted heat is rejected to the room in which...

a) A freezer maintains an interior temperature inside of −12.0°C
and has a coefficient of performance of 3.00. The freezer sits in a
room with a temperature of 25.0°C. The freezer is able to
completely convert 28.0 g of liquid water at 25.0°C to ice at
−12.0°C in one minute. What input power (in watts) does the freezer
require? (The specific heat of liquid water is 4.186 J/(g · °C),
the specific heat of ice is 2.090 J/(g · °C),...

A cube of ice is taken from the freezer at -6.5 ∘C and placed in
a 95-g aluminum calorimeter filled with 300 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 16.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333
kJ/Kg.
Part A What...

A cube of ice is taken from the freezer at -9.5 ?Cand placed in
a 95-g aluminum calorimeter filled with 330 g of water at room
temperature of 20.0 ?C. The final situation is observed to be all
water at 17.0 ?C. The specific heat of ice is 2100 J/kg?C?, the
specific heat of aluminum is 900 J/kg?C?, the specific heat of
water is is 4186 J/kg?C?, the heat of fusion of water is 333
kJ/Kg.
What was the mass...

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