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Determine the thermal effieincy of a heat transfer process

  • Thread starter daftpunk
  • Start date
  • #1
3
0

Homework Statement


determine the thermal effieincy of a heat transfer process where the following data has been used
Input=3kW
1.7 litres of water have been heated from 313K to 375K in 2.5 minutes
specific heat capacity of water= 4.19kj/kgK

Homework Equations


Thermal efficiency= network done (W)
total heat supplied (Q)




The Attempt at a Solution


am struggling where to start only done simple tasks

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
Well you have 1.7 L of water being heated from 313 K to 375 K. So how much heat does this require? (look at the units of specific heat capacity). This will be your work done W.

In order to convert this to Watts, you will need to use the formula Power = work done/time.
 
  • #3
3
0
output=1.7*4.19*(375-313)/(2.5*60)=2.914473Kw. 2.9174473/3= 0.981 or 98.1%. Thanks alot for help could you confirm this
 
  • #4
rock.freak667
Homework Helper
6,230
31
That should be correct.
 
  • #5
3
0
thanks
 

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