Abstract
This paper presents an open reversed Brayton cycle with regeneration (ORBCR) using moist air for air conditioning
cooled by circulating water, and proves its feasibility through performance simulation. Its refrigeration depends
mainly on the sensible heat of air and the latent heat of water vapor, its performance is more efficient than a
conventional air-cycle, and the utilization of turbo-machinery makes it possible. The adoption of this cycle will make
air-conditioned room more comfortable and reduce initial cost because of the very low temperature air obtained. The
sensitivity analyses of coefficient of performance (COP) of the cycle without regeneration and the equivalent
coefficient of performance (COPE ) of the cycle with regeneration to the efficiency of compressor (ηc ) and the
efficiency of compressor (ηt ), and the results of both cycles are also given. The simulation results show that the
COPE of this system depends mainly on the temperature before turbine (T7),ηc andηt, and varies with the wet bulb
temperature of the outdoor air (Twet) . Humid air is a perfect working fluid for central air conditioning and no cost to
the user. The ORBCR is more efficient because of the use of the return air to cool water, and then to cool the air
before turbine.