Coalescer Products for Industrial Refrigeration

Micro Fresh Filters manufacture a range of coalescers specifically designed for the industrial refrigeration industry using ammonia and other refrigerants.

Oil aerosols emitted by ammonia refrigerant compressors are under 5µm particle size and the majority are smaller than 2µm.

Other contaminants in the refrigeration system are solids consisting of rust and scale that are typically between 5µm and 0.5µm particle size. These can clog the coalescing media, shortening the life of the compressor as well as the coalescer.

The oil filter plays an important role in the operation of the coalescer by minimising the amount of solid particles circulating, thus allowing the coalescer to do it's job in removing oil aerosols.

Early coalescing filters were expensive and caused high pressure drop. New technology used in the manufacture of glass fibre and the latest studies of aerosol behaviour have led to the development of microfibre glass and graded porosity filter media giving much higher filter and coalescing efficiency. Early elements could remove particles down to 2µm, but graded porosity microfibre glass are able to remove particles as small as 0.001µm.Three Mechanisms of the coalescing process

Three mechanisms of the coalescing process
Diffusion - 0.001µm to 0.2µm Interception - 0.2µm to 2µm Direct impact - 2µm and larger


Filter Efficiency and Pressure Drop

Filter efficiency is important because it affects not only contaminant removal but also the filter life and the life of the coalescers.

Pressure drop is the first indication of the coalescer failing. It signals that the filter is becoming blinded and the flow is reduced. Flow rate, operating pressure, the volume of contamination and the type of contaminant in the stream all affect the rate of pressure loss across a coalescing filter.

When a pressure drop of between 8-10 psia is indicated the oil filter should be replaced.

Micro Fresh Filters produce a range of oil filters & coalescers specifically designed for the industrial refrigeration industry using ammonia and other refrigerants.

Refrigeration Oil Filter - Flow Restriction Graph


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Industrial Oil Filters | Strainers
 
Micro Fresh Filters [Aust] Pty Ltd.
Industrial, Diesel and Mining Filtration Products

Head Office: 69 Malcolm Road, Braeside, Victoria, Australia 3195
Mail: P.O. Box 794, Braeside, Victoria, Australia 3195
Telephone: +61 3 9587 9488 Fax: +61 3 9587 9400
Website: www.microfreshfilters.com