One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________?
Correct answer: C. 2263
- A. 40732
- B. 2676
- C. 2263
- D. 540
Explanation
At about 98°C, the latent heat of vaporisation of water is approximately 2.26 × 10³ kJ/kg. Hence the latent heat of condensation is about 2263 kJ/kg, not the much smaller sensible heat associated with the 2°C cooling.
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