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A vapour absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of 100 W is required at 250 K when the heat source available is at 400 K. Heat rejection occurs at 300 K. The minimum value of heat
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- 167
- 100
- 80
- 20
Correct Option: C
From question, since refrigeration effect of 100 W is required
| So, | = | |||
| Work obtained | 300 – 250 |
| Work obtained = = | = 20 W | 250 |
Now for this amount of work, heat is absorbed from reservoir 3 and rejected to sink 2.
| ∴ η = | = 1 - | = | ||||
| Q3 | 400 | 4 |
⇒ Q3 = 4W = 4 × 20 W = 80 W
