The difference between refrigerators and chillers

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Generally, when our colleagues go out to recycle chillers, when they encounter central air conditioning systems, they assume that the refrigeration unit is simply a chiller; indeed, they all fall under the category of air conditioning and refrigeration systems. But strictly speaking, there is a big difference. They all provide cooling, but cooling does not necessarily require a water source. Let’s take a closer look at their differences now – what is a refrigeration machine? A refrigeration machine consists mainly of four key components: a refrigeration compressor, a condenser, a cooling fan (evaporator), and solenoid valves. It also includes additional components such as an oil separator, a liquid storage tank, an oil sight glass, diaphragm-type manual valves, and filters. A chiller is a refrigeration device used in industry to circulate liquid and cool it to the desired temperature, thereby improving production efficiency (also known as: chilled water unit, ice water machine, refrigerator, freezer, cooling unit). These liquids can flow through the heat exchanger to cool the air or equipment. What is a chiller? Chillers are commonly known as freezers, refrigerators, ice-water machines, chilled water machines, cooling units, etc. Due to their wide use in various industries, there are countless different names for them. Its principle of operation is that it is a multi-functional machine that removes liquid vapor through a compression or heat-absorption refrigeration cycle. Steam compression chillers consist of four main components: the compressor of the steam compression refrigeration cycle, the evaporator, the condenser, and various metering devices, which enable the use of different refrigerants. Absorption chillers use water as a refrigerant, and rely on the affinity between water and lithium bromide solution to achieve a strong cooling effect. From here, it is not difficult to see. Chillers must have a water source. Whether the water source is used as a refrigerant or a carrier, it cannot be utilized without it. Generally, the large refrigeration units used in large-scale cooling applications are mostly chiller units. This is because they require a large capacity for cooling and a large heat exchange area; therefore, cooling towers must be installed to remove heat from the system. Additionally, pipes are needed to facilitate the circulation of coolant water in order to achieve the purpose of cooling. It has the widest range of applications, including screw, piston, centrifugal, heat pump, ammonia refrigeration, lithium bromide chiller units, and more. Many small air conditioning systems, due to their short refrigerant circuits, limited cooling capacity, or lack of a water source, do not require water as a refrigerant or carrier; instead, they use R22 or R134A as refrigerants and rely on fan-coils to blow air for cooling. Representative models include heat pump units and air-cooled units. After all, chillers are also used for cooling. *We usually refer to chillers as refrigeration units. In fact, there is a clear distinction between them. I hope all our colleagues will not confuse the concepts.