Consider the following statements;

The presence of air inside condensers

1) Remains as a non-condensable gas

2) Reduces the condensing coefficient

3) Tends to cling to the surface

4) Introduces large thermal resistance

Which of the above statements are correct?

Explanation:

• The performance of condenser gets affected badly by presence of air which will remain non condensable.
• It covers the heat transfer surfaces such as outside the surface of condenser tubes and reduces the condensing heat transfer coefficient.
• Clinging of air to surface reduces the condensing coefficient
• air imparts large thermal resistance due to its low thermal conductivity