Refrigeration Cycle Moisture Issues
Moisture, typically in the form of water, is detrimental to refrigeration systems. Its primary issue arises from its phase change properties at low temperatures found within the cycle.
Mechanism of Capillary Choke
- Low Temperatures: Refrigerant pressure drops significantly across the expansion device, such as a capillary tube. This pressure drop causes a corresponding temperature decrease.
- Freezing Point: If moisture is present in the refrigerant, it can reach its freezing point ($0^\circ C$ or $32^\circ F$) in the low-temperature region of the system.
- Capillary Tube Restriction: The capillary tube has a very small internal diameter. Frozen moisture (ice) can accumulate within this narrow passage.
- Blockage Formation: This ice accumulation gradually obstructs the tube, leading to a condition known as choke.
Consequences of Choking
A choked capillary tube severely restricts or completely halts the flow of refrigerant. This prevents the system from effectively transferring heat, thus disrupting the refrigeration cycle and preventing cooling.
While other components might eventually stop working due to system failure, the immediate and direct consequence of moisture freezing in the coldest part (often the capillary tube) is the choke itself.
Similar Questions
Reversed cornot cycle is used in__________ refrigerator
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Important Questions from Refrigeration Cycles and Devices
The refrigeration plants are charged by refrigerants from the cylinder at the _____.
In actual refrigeration systems, the compressor handles vapours only. What is this process commonly referred to as?
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In a vapour compression refrigeration system, liquid to the suction heat exchanger is used to
A hermetically sealed unit implies ____.
