The hybrid adiabatic technology used by VIRGA III systems was initially developed in Europe in response to widespread regulations aimed at preventing the spread of Legionnaires’ disease by replacing evaporative cooling towers, one of the most common breeding grounds for Legionella pneumophila.
The VIRGA III system eliminates standing water in favor of a fully closed coolant path, and the intermittent use of fresh water to augment the system’s cooling capacity only on the hottest days of the year.
The VIRGA III hybrid adiabatic system releases a fine water spray into the air prior to the air being pulled over the copper cooling tubes — lowering the air temperature and increasing the heat rejection capacity of the unit. The control system cycles individual fans as process water temperature dictates, and ultimately activates the fine spray of water when required. During the colder months, water spray activation is not required and the unit operates as a dry air cooler — eliminating sump freezing and dangerous ice buildup common with fluid coolers.