Question
Download Solution PDFFor ammonia refrigerating systems, the tubes of a shell and tube condenser are made of_______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Ammonia Refrigerating Systems:
- Ammonia (NH3) is commonly used in large-scale refrigeration systems due to its excellent thermodynamic properties and low cost.
- However, ammonia is also highly reactive with certain metals, which necessitates the use of specific materials in the construction of refrigeration components.
Material Selection for Condenser Tubes:
- The tubes in a shell and tube condenser for ammonia refrigerating systems are typically made of steel.
- This is because ammonia reacts with copper and its alloys, such as brass, leading to corrosion and potential system failure.
- Aluminium, while lightweight and thermally conductive, can also react with ammonia under certain conditions, making it less suitable for this application.
Important Points
When selecting materials for ammonia refrigerating systems, it is crucial to choose those that are resistant to ammonia corrosion and compatible with its chemical properties.
Additional Information
Other materials considerations in refrigerating systems:
(1) Stainless Steel:
- Stainless steel is also a good option for ammonia systems due to its excellent resistance to corrosion and mechanical strength.
(2) Plastics and Polymers:
- Some high-performance plastics and polymers can be used in certain components of ammonia refrigerating systems, provided they are chemically compatible.
(3) Galvanized Steel:
- Galvanized steel can sometimes be used, but the galvanizing layer must be carefully maintained to prevent ammonia-induced corrosion.
Last updated on May 28, 2025
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