What is Fridge Compressor

How Does a Refrigerator Compressor Work?

To understand how a refrigerator compressor works, start by recognizing its role. It is the heart of the refrigeration cycle. The compressor is essential. It turns the refrigerant from a liquid to a low-pressure gas in the evaporator. The compressor’s job is to take low-pressure refrigerant gas. It makes it into high-pressure gas. The gas is then compressed. This increases its heat, pressure, and temperature.


The high-pressure gas moves to the condenser. There, it condenses into a liquid. This completes the cooling cycle of the refrigerator. The liquid refrigerant then passes through the expansion valve. The valve controls the flow of the refrigerant and turns it back into a low-pressure liquid. This process shows how the fridge compressor works. It is a type of refrigeration compressor. This is especially true for commercial refrigerators.

What are a refrigerator’s main components?


The compressor is the heart of the fridge. It moves the refrigerant through the system. It maintains pressure and keeps the circuit warm. It’s like a bicycle tube that pumps air to make it hot and compress the refrigerant.


Located at the back of the refrigerator, the condenser can get dusty. It cools and condenses the refrigerant gas into a liquid.


The evaporator keeps items cold in the refrigerator. It turns the liquid refrigerant into a gas through evaporation. This cools the area and is crucial for storing food.

Capillary Tube

A capillary tube is a thin piece of tubing that serves as an expansion device. It routes the liquid refrigerant and sprays it into the evaporator. The evaporator is a low-pressure environment.


The thermostat monitors the cooling process. It does this by checking the temperature and switching the compressor on and off. Its sensor detects the cold inside the refrigerator. The system ensures it turns off when it reaches the desired temperature. Then, it turns on again when heat begins to increase.

What are the types of refrigerator compressors?

Reciprocating Compressors

A reciprocating compressor operates on a piston-based combustion engine. The piston moves the refrigerant from the evaporator and pumps it. This increases its temperature and pressure. The compressed gas then flows into the condenser.

Centrifugal Compressors

A centrifugal compressor uses kinetic energy. It comes from a spinning impeller, which moves the refrigerant. The spinning impeller raises the speed and temperature of the gas. Then, it releases the gas into the condenser to continue the cooling cycle.

Rotary-Vane, Rotary-Screw, and Rotary-Scroll Compressors

Rotary-vane compressors use a rotating drive shaft and vanes. They manage suction and discharge, compressing the refrigerant. Rotary-screw compressors involve male and female rotors. They spin in opposite directions to trap and compress the refrigerant. Rotary-scroll compressors have fixed and orbiting scrolls. They create pockets to compress the refrigerant.

Top Mounted versus Bottom Mounted Compressors

Sliding Door

Top Mounted Compressor

Top-mounted compressors are for dry storage areas. They are safe from floor dust or spills. Cleaning them often and placing them in cooler environments makes them more energy-efficient. They place their components higher. This means they last longer and need fewer service calls. But, they are harder to maintain and can increase repair costs. They also release hot air that can be hazardous in areas with low ceilings. Furthermore, they are more expensive.

Top Mounted Compres

Bottom-mounted compressor

Bottom-mounted compressors are easier to access, making maintenance and cleaning simpler. They are ideal for warmer environments and have a low initial cost. But, they get dirtier more often. This is because the refrigerant runs from the bottom to the top through the back of the fridge. This can reduce some storage space.

Commercial Refrigerator

Bottom-mounted and top-mounted compressors offer great benefits for any commercial kitchen application. Be sure to pick the one that best fits your needs to maximize the benefits.

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What happens when a refrigerator compressor fails?

When a fridge compressor fails, the cooling stops. This makes the fridge warm, and it may spoil the food.

What are the uses for a refrigerator compressor?

A fridge compressor circulates refrigerant through the refrigeration system. It ensures that the fridge stays cool and at a steady temperature.

What causes a refrigerator compressor failure?

The compressor can fail because it overheats or due to electrical issues. It can also fail from a lack of maintenance or refrigerant leaks.

What is the compressor part of a refrigerator?

The compressor is the heart of the fridge’s refrigeration system. It compresses the refrigerant and enables the cooling cycle to keep the fridge cold.

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