Power consumption of a refrigerating machine is determined in... | Agrigyan

Design features of hermetically sealed refrigeration compressors:

• In a hermetic compressor, the motor and compressor are mounted on a common shaft and completely enclosed within a welded, gas-tight steel casing without external shaft seals, effectively eliminating the primary source of refrigerant leakage to the atmosphere.
• Lubrication is self-contained and simple (splash or forced internal oiling).
• Hermetic compressors are quieter due to internal spring suspension and acoustic muffling within the welded shell.
• The electric motor is internal, not external.

Refrigerant metering and liquid level controllers:

• Condensers liquefy compressed discharge vapor.
• Capillary tubes provide fixed frictional pressure drop without modulating to liquid level variations.
• float valve (specifically a low-pressure float valve in flooded evaporators) responds directly to liquid refrigerant level inside the surge drum/evaporator shell, opening to admit makeup liquid when the level drops and closing when the target flooded level is satisfied.
• Filters remove particulate debris.

Performance definitions in cooling tower thermodynamics:

• Approach of a cooling tower is the temperature difference between the cold water leaving the cooling tower ($T_{out}$) and the ambient wet-bulb temperature ($T_{wb}$):
  $$\text{Approach} = T_{out} - T_{wb}$$
• Gradient is an informal rate of temperature change.
• Lift is static pumping height.
• The Range of a cooling tower (cooling range) is defined as the temperature difference between the warm water entering the cooling tower ($T_{in}$) and the cooled water leaving the tower basin ($T_{out}$):
  $$\text{Range} = T_{in} - T_{out}$$