Abstract: A power generation system having a permanent magnet generator and an electrical conversion system. The electrical conversion system can have an AC/DC converter and a DC/AC inverter. The AC/DC converter can be mounted on the permanent magnet generator within a common enclosure with the permanent magnet generator. One or more DC bus bars can transmit a DC current generated by the AC/DC converter to a second enclosure, which can have a DC/AC inverter to generate AC power.

Abstract: A refrigerating system comprises a compressor (1A, 1B, 1C), a heat rejection device (2), an expansion device (15), an evaporator (5A, 5B, 5C) and a receiver (4), capable of operating with the compressor discharge higher than the critical pressure of the refrigerant; where the flow outlet from the heat rejection device is regulated by a pressure control valve (7), the pressure downstream of the pressure control valve is regulated by a gas vent valve (8), the refrigerant flow to the evaporator is further regulated by an automatic control device (41, 52, 14) at the inlet to the evaporator, and the automatic control device being set to permit intermittent flow of liquid refrigerant to the receiver during normal operation of the system. The refrigerant may be carbon dioxide, which may operate under transcritical pressures e.g. 80 to 120 bar absolute. The receiver acts as a trap for any liquid from the evaporator and ensures that the gas flow to the compressor suction is dry.