Patent ID: 7061763

Claim:
A method of cooling a cabinet containing heat dissipating electronic components (PBA), comprising the steps of: circulating cooling medium in a closed fluid system to absorb heat in an evaporator in the cabinet and to transfer the absorbed heat from the cabinet and to emit said heat outside the cabinet in a condenser/heat exchanger, detecting the evaporator temperature (T 1 ) inside the cabinet to determine the heat load on the system; detecting the ambient temperature (T 3 ) and the temperature (T 2 ) in the condenser to determine the conditions of the heat transfer from the cooling medium; controlling a forced circulation of the cooling medium based on the detected heat load and conditions of heat transfer; controlling the flow of the cooling medium back to the evaporator in the cabinet based on the detected heat load and conditions of heat transfer; and controlling the activation/deactivation of a vapor compression cycle based on the detected heat load and conditions of heat transfer; thereby allowing a controlled shifting between cooling of the cabinet in different cooling modes optimized for different heat load and heat transfer conditions.