Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion
Discussion Forum : Heat Transfer, Refrigeration and Air Conditioning - Section 1 (Q.No. 5)
5.
In a refrigerating machine, heat rejected is __________ heat absorbed.
Discussion:
17 comments Page 1 of 2.
Raj said:
1 decade ago
For cooling purpose it is essential that heat rejected is more than heat absorbed.
Siva said:
1 decade ago
Heat absorbed + work done in it = heat rejected. So that's the matter.
Mohnesh said:
1 decade ago
In refrigeration heat rejected is more than heat absorbed because its function is cooling a substance so for cooling we used reverse cycle.
Ahmed said:
1 decade ago
Yes C, Because Heat absorbed + work done in it = heat rejected.
Ankit tamrkar said:
1 decade ago
Ya, the answer will be C, because, heat absorbed + work done = heat rejected.
Sagar naikar said:
1 decade ago
Yes, Work done = Heat absorbed-Heat rejected.
Sekhar said:
1 decade ago
In VCRS heat rejected from condenser to surrounding fluid (Q1) is summation of work given to the compressor (W1) and heat extracted (Q2) from the space which is to be cooled.
Q1= (W1) + (Q2).
Q1= (W1) + (Q2).
Amangpm said:
1 decade ago
For extracting heat from low temperature to high temperature. We need to input some power or work. As in case of 2nd law of thermodynamics.
We have to maintain lower temperature for cooling purpose and have to extract heat from lower temperature. And reject it to higher temperature level.
We have to maintain lower temperature for cooling purpose and have to extract heat from lower temperature. And reject it to higher temperature level.
(1)
Lucky said:
10 years ago
This is because, some mechanical work also to be done by machine to reject the absorbed heat from a lower temperature to high temperature.
(1)
Amar said:
9 years ago
Yeah! answer C is Right. Agree.
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