Log in
Physics
1
answer
0
watching
169
views
9 Nov 2019

A Carnot freezer that runs on electricity removes heat from thefreezer compartment, which is at -10.0 C and expels it into theroom at 25.0 C.You put an ice-cube tray containing 350 g of waterat 15.0 C into the freezer.

-What is the coefficient of performance of this freezer?
-How much energy is needed to freeze this water?
-How much electrical energy must be supplied to the freezer tofreeze the water?
-How much heat does the freezer expel into the room while freezingthe ice?

Watch
1
answer
0
watching
169
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Jamar Ferry
Jamar FerryLv2
17 Aug 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

50.0 mL of water at 10.0 ºC is placed in the freezer compartment of a refrigerator with a coefficient of performance of 6.00. How much heat energy is exhausted into the room as the water is changed to ice at -15.0 ºC?

A. Consider two arbitrary heat engines. Engine A hasanefficiency of 60%. Engine B absorbs the same amount ofheat from theheat reservoir as Engine A; however, it exhauststwice as much heatto the cold reservoir as Engine A. Findthe efficiency of EngineB.


B. Consider a nonreversible heat engine that operatesbetweentemperatures Th and Tc, whereTc =1/3 Th. The engine absorbs anamount of heatQh from the heat reservoir in order to doan amount ofwork W.

1) If the engine discards an amount of heat Qc= 3/5Qh to the cold reservoir, determine the efficiencyofthis engine.

2) How much work, in terms of Qh, would beavailableto a Carnot heat engine operating between the same twotemperatures?What would the efficiency of this Carnot enginebe?



C. A freezer with a coefficient of performance of 4 isused toconvert 2kg of water to ice in one hour. The waterstarts at atemperature of 20°C, and the ice that is producedis cooled to atemperature of -5°C.

1) How much heat must be removed from the water for thisprocessto occur?

2) How much electrical energy does the freezer use duringthishour of operation?

3) How much heat is discarded into the room that housesthefreezer?

A. Consider two arbitrary heat engines. Engine A hasanefficiency of 60%. Engine B absorbs the same amount ofheat from theheat reservoir as Engine A; however, it exhauststwice as much heatto the cold reservoir as Engine A. Findthe efficiency of EngineB.


B. Consider a nonreversible heat engine that operatesbetweentemperatures Th and Tc, whereTc =1/3 Th. The engine absorbs anamount of heatQh from the heat reservoir in order to doan amount ofwork W.

1) If the engine discards an amount of heat Qc= 3/5Qh to the cold reservoir, determine the efficiencyofthis engine.

2) How much work, in terms of Qh, would beavailableto a Carnot heat engine operating between the same twotemperatures?What would the efficiency of this Carnot enginebe?


C. A freezer with a coefficient of performance of 4 isused toconvert 2kg of water to ice in one hour. The waterstarts at atemperature of 20°C, and the ice that is producedis cooled to atemperature of -5°C.

1) How much heat must be removed from the water for thisprocessto occur?

2) How much electrical energy does the freezer use duringthishour of operation?

3) How much heat is discarded into the room that housesthefreezer?

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in