A Carnot freezer takes heat from water at 0 o C inside it and rejects it to the room at a temperature of 27 o C . The latent heat of ice is 336 × 10 3   J k g - 1 . If 5kg of water at 0 o C is converted into ice at 0 o C by the freezer, then the energy consumed by the freezer is close to :

Question

A Carnot freezer takes heat from water at 0 o C inside it and rejects it to the room at a temperature of 27 o C . The latent heat of ice is 336 &#215; 10 3 &#160; J k g - 1 . If 5kg of water at 0 o C is converted into ice at 0 o C by the freezer, then the energy consumed by the freezer is close to :

Aicharya · Accepted Answer

Q= m L = 5 &#215; 336 &#215; 10 3 = Q s i n k Q s i n k Q s o u r c e = T s i n k T s o u r c e &#8756; &#160; &#160; &#160; Q s o u r c e = T s o u r c e T s i n k Q s i n k &#8756; &#160; &#160; &#160; Work done &#160; = Q s o u r c e - Q s i n k = Q s i n k T s o u r c e T s i n k - 1 = 5 &#215; 336 &#215; 10 3 300 273 - 1 = 1 .67 &#215; 10 5 &#160; J

A Carnot freezer takes heat from water at 0 o C inside it and rejects it to the room at a temperature of 27…

Solution