These include direct expansion systems that are able to operate at high return-air temperatures, suitable for the increased temperatures within which IT equipment works; chilled water systems that maximize freecooling
operation all year round and include a chilled water floor mount range and freecooling
chillers; as well as an adiabatic freecooling
chiller (Liebert AFC), which combines 3 cooling technologies (adiabatic cooling, freecooling
, and mechanical cooling) in a single unit and is capable of achieving a partial power usage effectiveness (pPUE) of 1.08.
New branch of Italian firm supplies Microgel water-cooled portable chillers with built-in heating capability (6 to 48 kw) for a temperature range of 20 to 195 E Automatic "freecooling
" when neither heating or chilling is required to modify incoming process-water temperature.
Aside from thermal storage, another method using inexpensively chilled water is freecooling
. In freecooling
, says Siebert "the cooling tower water temperature is lowered and that cold water is circulated through the chiller." This accomplishes a non-energy (no energy used) heat transfer within the vessel of the chiller which results in obtaining approximately 60 percent of the cooling capacity of the chiller without running the compressor.