Recirculating Cooler: how does it work?

Chillers are used in many Laboratories for a wide variety of important purposes, from improving the precision of experiments to enhancing the safety of laboratory personnel. They are a versatile piece of equipment with many uses and important benefits. Depending on the needs of the laboratory, different types of chiller can be used. In this article, we’ll focus on recirculating chillers.

What is a recirculating chiller?

A recirculating chiller is a type of closed, high-efficiency cooling system used in external cooling applications. These cooling systems are ideal for laboratory applications requiring continuous use. Its main function is to remove mechanical or electrical heat, operating on the principle that the temperature of an object or system is controlled by the flow of heat in or out. Most recirculating coolers can operate at temperatures ranging from -25°C to 130°C.

The chiller is generally used to provide constant low-temperature conditions for inspections, chemical, biological and physical experiments that need to be carried out at low temperatures, mainly used in medicine, food processing, the chemical industry and teaching in universities and colleges. .research institutes.

How does a recirculating cooler work?

A recirculating cooler works by incorporating high-pressure refrigerant circulation to speed up the process of removing heat from an object. These systems consist of four main components: a compressor, a condenser, a thermostatic expansion valve and an evaporator.

The cooling process begins when a refrigerant gas is pumped into the compressor and transformed into a high-temperature, high-pressure gas. The gas then travels to the condenser, where ambient air or water takes the heat from the refrigerant and condenses it from gas to liquid.

In its liquid state, the refrigerant passes through the thermostatic expansion valve, where the pressure and temperature drop, causing the fluid to evaporate and turn into a gas. When it returns to its gaseous state, the refrigerant is returned to the compressor and the process begins again. Because this is a continuous service, recirculating chillers waste neither coolant nor water throughout the process. It’s important to note that this process may vary slightly depending on whether the recirculating chiller has an air or water-cooled condenser.

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