1) Free cooling – Seawater temperature is below 5.5 degrees Celsius [42°F] and cooling demand low (less than 2,400kW). All cooling demands are covered by free cooling heat exchangers.2) Combined operation – Seawater temperature is between 5.5°C and 11.5°C [52.7°F]. Heat exchangers are used for pre-cooling of the cooled water, before it is fully cooled by chillers to the desired temperature.3) Chiller cooling – Seawater temperature is above 11.5°C. The seawater is too warm to be used for free cooling so absorption and compression chillers provide all cooling. Free cooling exchanges are bypassed completely.
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