Answer :
Final answer:
A restriction in the liquid line of a refrigeration system lowers the suction pressure and increases the superheat due to a decrease in refrigerant flow and undercooling.
Explanation:
When the liquid line in a refrigeration system is restricted, the supply of refrigerant to the metering device decreases. This leads to the effect that the suction pressure goes down and the superheat increases.
This is because the reduced refrigerant flow rate causes lower pressure at the suction side.
Simultaneously, the reduction in refrigerant causes undercooling and excessive superheating, because the remaining refrigerant in the evaporator has to absorb more heat to compensate the insufficient cooling effect.
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Final answer:
Restriction in the liquid line leads to a decrease in suction pressure due to reduced refrigerant flow, and an increase in superheat due to the remaining refrigerant absorbing more heat.
Explanation:
When the liquid line is restricted, it effectively reduces the supply of refrigerant to the metering device. As a consequence, the suction pressure decreases, this is because the compressor would be pulling on a restricted refrigerant, leading to lower pressure in the suction line. Alongside, the superheat increases. This is the result of a reduced refrigerant flow, the existing refrigerant absorbs more heat than usual before it gets back to the compressor, resulting in increased superheat.
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