CHILLERS REFRIGERANTS
at night when ambient temperatures are lower. Further efficiencies are also possible – see the tables on page 48.
Plant-room applications Most applications to date have been for external air-cooled chillers or external containerised plant rooms. However, various regulations and rules3 permit plant-room applications designed as Zone 2 special machinery rooms to accommodate HC chillers. Where the entire system is located in a special machinery room, HC refrigerants are permitted without
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restricted refrigerant charge size. Machinery rooms using flammable refrigerants must be designed to prevent the ignition of a refrigerant and air mixture. Construction should consist of fire- and vapour-proof walls. There should be an open area within an external wall to allow the refrigerant to migrate out, and to ensure that there is insufficient containment for a dangerous overpressure to develop in the event of ignition. The opening should consist of floor-to-
ceiling louvres with projected area typically greater than 62% of the area of the wall.
June 2012 CIBSE Journal 43
The energy efficiency of chiller systems can be maximised through a combination of factors
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