Since NRF developed the boxcooler they used the physical principle of "up draught of warm water". The principle is based upon the mass differences of water caused by temperature differences. Water with a higher temperature has a lower specific mass then colder water. During the running of the power source, the water in the sea chest is heated by the hot engine cooling water. As a result of the reduction in specific mass, the colder water from outside will force the hot water out of the sea chest. The pressure of this system only amounts to several tenths of mbar.

Application

NRF boxcoolers can be applied in all kind of vessels such as barges, tugs, ferries, dredgers, tankers, etc. for main engines, auxiliries, air conditioning or other applications. The maximum heat that can be dissipated is unlimited. However, physical space available in the ship limits it. As the NRF boxcooler is tailor made, it always will fit into the available space.