Absorption refrigeration is carried out by using a binary solution composed of two substances as a working medium. These two substances have different boiling points at the same pressure, wherein the high boiling component is called an absorbent and the low boiling component is called a refrigerant. There are two commonly used absorbent-refrigerant combinations: one is lithium bromide-water, which is usually suitable for large central air conditioners, and the other is water-ammonia, which is usually suitable for small air conditioners.
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