Correct option is B
In a single-stage vapor compression refrigeration cycle, the flash chamber (or flash tank) is used for subcooling the liquid refrigerant and flash gas removal. It is typically part of a system with multiple evaporators or for improving efficiency.
· The flash chamber is placed after the expansion valve. It separates the liquid and vapor refrigerant after partial expansion.
· The liquid refrigerant (subcooled) is sent to the evaporator, while the flash gas (vapor) is bypassed directly to the compressor suction.
· This reduces the mass flow rate of refrigerant through the evaporator (since only liquid enters) and thus reduces the size of the evaporator required for the same cooling capacity.
· It does not significantly increase the refrigerating effect per kg of refrigerant through the compressor, but it improves the system efficiency by avoiding flash gas in the evaporator (which would not contribute to cooling).
· It does not increase the compressor pressure ratio; in fact, it might help in some cases by preventing liquid slugging.
