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Different refrigeration systems use different refrigerants based on their scale and efficiency requirements. Option A (CFC) is incorrect — CFC (chlorofluorocarbon), also known as Freon, is used in DOMESTIC (household) refrigerators and small air conditioners. CFC is being phased out globally because it depletes the ozone layer. Option B (Ammonia NH₃) is CORRECT — the image states: बड़े शीतगृह संयंत्रों में प्रशीतक के रूप में अमोनिया का उपयोग करते हैं. Ammonia has excellent thermodynamic properties for large-scale refrigeration: very high latent heat of vaporization, low boiling point (-33°C at atmospheric pressure), and high coefficient of performance (COP). It is used in industrial cold storage, ice plants, food processing facilities, and large refrigeration systems. Option C (Nitrogen gas) is incorrect — liquid nitrogen is used for ultra-cold freezing (cryogenic applications like quick-freezing food, medical applications) but not as a standard refrigerant in cold storage refrigeration cycles. Option D (Carbon dioxide) is incorrect — CO₂ has been used historically as a refrigerant (R-744) and is making a comeback in some modern systems, but the standard answer for large cold storage in Indian competitive exams is Ammonia.
FAQ
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
