Suited for protecting remote and mission-critical control and instrumentation equipment, active and passive cooling technologies work together to handle extreme climatic conditions. Should electrical power fail completely, the passive cooling system continues to operate indefinitely, maintaining low shelter temperatures until maintenance work can be performed. The water coolers offer an IP rating of IP65 and can be provided in versions suitable for use in hazardous areas. Hybricool operates on the refrigeration principle and has a closed-loop system with four main components: compressor, condenser, throttle and evaporator. The evaporator is a heat exchanger element that can be installed inside the water storage tank of a passive cooling system to decrease temperature.