Patent ID: 6155062
Filing Date: 2000-12-05
Classification: B64D

Abstract:
A mode of operation of an air-conditioning installation of a helicopter cabin or cockpit, the helicopter being equipped with an auxiliary power unit adapted to deliver additional electrical power less than the electrical power of the main onboard alternator, which installation is of the type using cyclic compression and expansion of a coolant fluid and includes, by way of a external high-pressure unit, a storage tank for said fluid, and a motor-compressor powered by an electrical control system including a controller and an inverter for controlling the motor-compressor, the motor-compressor being associated with a condenser equipped with a fan and, by way of an internal low-pressure unit, an evaporator associated with an expansion unit, with air inlets and outlets communicating with said cabin or cockpit, which mode of operation is characterised in that it includes a start-up sequence controlled by said inverter during which the fan of the condenser is first powered up, after which the motor-compressor is powered up to start it at a low speed, after which the motor-compressor is operated under its normal conditions and as a function of the cooling requirements of the installation.