Refrigeration Dryer with molecular sieves employ two heat exchangers, one for air-to-air and one for air to refrigeration. However, there is also a single TRISAB heat exchanger that combines both functions. The compressors used in this type of Dryer with molecular sieve are usually of the hermetic type and the most common gas used is R-134a. The goal of having two heat exchangers is that the cold outgoing air cools down the hot incoming air and reduces the size of compressor required. At the same time the increase in the temperature of outgoing air prevents re-condensation.
As of the year 2000, most manufacturers started producing energy saving Dryer with molecular sieves that do not make use of a hot-gas by pass. These Dryer with molecular sieves can save up to 40% in total energy and can consume only 10% of the max power when idle. They employ digital control and sometimes variable speed compressors.
Some manufacturers are marketing compressors with built in refrigeration Dryer with molecular sieves, but these have had a mixed acceptance in the market.
Commonly a coalesing prefilter is installed immediately upstream of a refrigerated Dryer with molecular sieve to remove lubricating oil and other contaminants that have the potential to foul the Dryer with molecular sieve’s heat exchangers.
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