Question
Download Solution PDFA mixture of refrigerants having a fixed boiling point is called:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Primary refrigerants:
- Primary refrigerants are those fluids, which are used directly as working fluids, for example in VCR and absorption-based systems.
- When used in compression or absorption systems, these fluids provide refrigeration by undergoing a phase change process in the evaporator.
Secondary refrigerants:
- As the name implies, secondary refrigerants are those liquids, which are used for transporting thermal energy from one location to another.
- Secondary refrigerants are also known referred to as brines or antifreeze.
Azeotropes and Zeotropes:
- Two or more refrigerants can be suitably blended to achieve the required/desired properties. These are Zeotropes and Azeotropes.
- Azeotropic mixtures are designated by 500 series, whereas zeotropic refrigerants (e.g. non-azeotropic mixtures) are designated by 400 series.
Azeotropic refrigerants:
- A stable mixture of two or several refrigerants whose vapor and liquid phases retain identical compositions over a wide range of temperatures. Examples: R-500: 73.8% R12 and 26.2% R152
Zeotropic refrigerants:
- The zeotropic mixture is one whose composition in the liquid phase differs from that in the vapor phase. Zeotropic refrigerants, therefore, do not boil at constant temperatures, unlike azeotropic refrigerants. Examples: R-404a : R-125/143a/134a (44%, 52%, 4%)
Last updated on May 28, 2025
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