In an attempt to reduce the emission of greenhouse gases, it has become even more important to optimise theenergy consumption and get most out of the fuels used. In this discussion also comes the emissions ofrefrigerants, which at some stage will participate in the formation of smog, how to minimise the leaks andwhat gases to use in the future. This is a very big topic so to narrow it down we have decided to focus onindustrial refrigeration systems placed where “waste” heat is used in a district heating system.Traditional industrial refrigeration systems was based on R-22 or R-717 as refrigerant. R-22 has anOzoneDepleting Potential (ODP) and is regulated under the Montreal Protocol and most of the alternatives are nowalso regulated under the Montreal Protocol due to their Global Warming Potential (GWP). R-717 orammonia has been the preferred refrigerant in industrial refrigeration systems all over the world for manyyears due to high efficiency and the low price of the refrigerant.Many industrial plants are originally placed outside city limits but by time the cities grow and one day theplant is surrounded by inhabited buildings. This gives problems both with the transport of products to andfrom the site but also the emissions of refrigerants can become a problem. The use of ammonia scrubbers hasbeen neglected, but in many cities, it is a requirement in any ammonia machine room to use scrubbers.
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