Refrigeration Systems and Compressors Quiz

The heat removed from the refrigerant by the condensing medium is equal to the heat added to the refrigerant in the evaporator plus the work done on the refrigerant by the compressor.

Industrial refrigeration systems often have multiple evaporators to handle different cooling needs. For example, a plant may have separate rooms for freezing, long-term storage, and fresh produce storage, each with its own evaporator at a different pressure.

Industrial refrigeration systems often have multiple compressors to ensure redundancy and handle varying cooling demands. This is similar to having multiple boilers in case of a failure or to meet fluctuating needs.

Booster compressors are used in some industrial refrigeration systems to achieve the low temperatures and pressures required for the coldest evaporators.

Industrial refrigeration systems often have multiple condensers for redundancy and to ensure continued operation even if one condenser fails.

Isolation and servicing valves are essential in refrigeration systems for maintenance and repair. They allow for isolating specific components, such as evaporators, condensers, receivers, and compressors, for safe access.

Emergency discharge valves are crucial safety devices in refrigeration systems. They release all the refrigerant from the system in case of an emergency, preventing potential hazards.

Refrigeration systems require safety valves and temperature limit controls for pressure and temperature regulation, ensuring safe operation and preventing dangerous situations.

A safety head is a device installed in reciprocating compressors to release trapped liquid refrigerant during compression, preventing damage caused by excessive pressure.

Safety heads are typically held in place by a strong spring. When excessive pressure builds up, the spring is overcome, allowing the liquid refrigerant to escape into the discharge line.

Rotary compressors use rotating components to compress refrigerant vapor, unlike reciprocating compressors that use piston movement.

Rotary compressors are often used in compound refrigeration systems, where they act as 'boosters' to create very low pressure for deep freeze applications.

In compound refrigeration systems, the booster compressor discharges intermediate pressure refrigerant into the suction of the main compressor. An intercooler lowers the refrigerant's density, reducing the workload of the main compressor.

Copper or copper alloys are not used in ammonia compressors because ammonia can react with them, causing damage.

Compressor bearings are essential components that allow the rotating parts to operate smoothly.

Compressor bearings must be compatible with the type of refrigerant used. For example, materials like copper are unsuitable for ammonia compressors.

A type of compressor that uses a rotating impeller to increase the velocity of the refrigerant, converting kinetic energy into potential energy, resulting in high pressure.

A compressor that uses pistons, vanes, or gears to directly compress refrigerant by reducing its volume.

A type of compressor that uses two helical rotors to compress refrigerant, suitable for medium to high-capacity refrigeration systems.

A type of compressor that uses a pair of spiral-shaped scrolls to compress refrigerant. They are known for their efficiency and quiet operation.

A component in a refrigeration system that cools down the refrigerant after it leaves the compressor, reducing its discharge temperature.

A type of compressor that operates at a lower pressure stage in a refrigeration system, often used to boost pressure and further compress the refrigerant.

The process of using a compressor to increase the pressure of a refrigerant vapor, which raises its temperature.

A component in a refrigeration system that distributes liquid ammonia to the booster compressor discharge, helping to lower refrigerant temperature.

A vessel that separates liquid refrigerant from the vapor before it enters the compressor, preventing damage to the compressor.

A liquid solution, often water-based, used to transfer heat without changing its state, commonly used to cool various processes.

A refrigeration system where refrigerant directly absorbs heat from the cooled medium, like a refrigerator where the refrigerant cools the food.

A refrigeration system that uses a secondary coolant (brine) to transfer heat to the cooling medium, like an ice rink where brine cools the ice.

A refrigeration system that uses mechanical devices like compressors to transfer heat from a cooling medium to a different location.

A type of condenser commonly used in ammonia refrigeration systems and larger air conditioning systems. It features a horizontal cylindrical shell with tubes inside, providing efficient heat transfer at a reasonable cost. Its design allows for easy cleaning, minimizing maintenance.

A condenser design that uses both air and water for cooling the refrigerant vapor. It typically involves condensing coils within a cabinet, allowing for efficient heat dissipation through evaporation.

The process of removing heat from the refrigerant vapor to convert it back into a liquid. Occurs in the condenser.

The fluid used to cool the refrigerant vapor in the condenser. Examples include water or air.

The refrigerant is cooled and its vapor changes back into liquid.

Refrigeration system component where liquid refrigerant absorbs heat from a medium to be cooled, transforming into vapor.

A type of evaporator where only enough liquid refrigerant enters to maintain the desired temperature. Liquid flows through, absorbs heat, evaporates, and exits as vapor. It contains a small amount of liquid at any time.

Evaporator where liquid refrigerant is injected into an evaporator, often in larger volumes, leading to more liquid than vapor. It can be used for large refrigeration systems or when a higher cooling capacity is needed.

A type of evaporator that combines both liquid and vapor, recirculating refrigerant to maintain desired conditions. Liquid refrigerant enters the evaporator and is distributed to various sections.

Equipment that transfers heat from one fluid to another without mixing them. One fluid gains heat, the other loses heat.

The component of a refrigeration system where refrigerant vapor releases heat to the surrounding environment, transitioning back into a liquid.

Refrigerant used in some systems that requires compressors designed for its high discharge pressure. It's often used for its environmental benefits.