DEVEL OPMENT OF AN ADVANCED AIR CONDITIONING PLANT FOR DDG‐51 CLASS SHIPS

Abstract

ABSTRACTAn advanced performance R‐114 centrifugal air conditioning plant is being developed for DDG‐51 class ships. This plant will occupy 25% less volume than comparable existing fleet units, weigh 25% less, consume 35–40% less energy and incorporate reliability improvements. The size and weight savings result from the use of advanced heat transfer surfaces i.e., corrugated nucleate boiling tubes in the evaporator and finned titanium tubes in the condenser.Energy savings are achieved with a more energy efficient thermodynamic cycle, a subcooler, a 97% efficient motor, narrowing the difference between refrigerant evaporating and condensing temperatures, and a compressor designed specifically for R‐114. This latter feature provides a broad efficient range of head and flow without the need for inefficient hot gas bypass. Reliability improvements result from the titanium condenser, sealed insulation motor and the use of an all electronic control system.The development of the unit is described, test results provided and a basis for the energy savings presented.