An open Reversed Brayton cylce with Regeneration Using Moist Air for Air Conditioning Cooled by Circulating Water

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.