When Ammonia is used as a refrigerant in vapour compression cycle?
Correct answer: B. Steel tubes used
- A. Cu Tubing used
- B. Steel tubes used
- C. Both a & b
- D. Material does not effect by refrigerant
Explanation
Ammonia attacks copper and copper alloys, so copper tubing is unsuitable in an ammonia refrigeration system. Steel tubing is used because it resists the chemical action of ammonia under the operating conditions. Students may choose both materials because copper is common in many refrigeration systems, but that practice applies to refrigerants that do not react adversely with copper.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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