Question

How much percent of Non-condensable gases are contained in steam?

(a) 0.5 – 5%

(b) 10 – 25%

(c) 75 – 85%

(d) 50%

I had been asked this question in an online quiz.

This key question is from Hydrothermal Systems topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer 1

Correct option is (a) 0.5 – 5%

Easy explanation: The steam contains 0.5 – 5% by weight of non-condensable gases which appear in the turbine exhaust. These gases consist mainly of carbon dioxide with small amounts of methane and ammonia, which are largely harmless in the quantities present.