Study on modified ammonia absorption cycles for polygeneration systems

Abstract

Air conditioning to safe and healthy refrigeration chilling for food storage heat for drying and preservation and desalinated potable water for hygiene and wellness are energy intensive to produce especially when the process uses conventional production methods Most end users need these four energy products considered integral to human life in different entropy proportions Hence the optimum thermodynamic cycles to produce such utilities should exploit locally available low and medium waste heat temperature sources in varying environmental heat sinks from tropical to freezing extremes The research for combined power cooling and desalinated water for a typical applications focus of this exploratory work is to utilize low and mid grade heat sources Novel combined ammonia water absorption cycles are employed to maximize the cooling and converting recovered energy into combined products of mechanical converting to electricity and heat chilling recovery for brackish water desalination In order to achieve this NH3H2O wide configured boundaries are selected for thermally operable thermodynamic cycles for conversion of heat to useful products Unlike the limited pressure cycles of conventional steam engines binary liquid offers additional distinct ammonia concentration variable to give counter current heat transfer potentials with different boiling temperatures and physical properties at same pressure The vapour generated is enriched in ammonia and can be conveniently used for power and cold generation by varying pressures Computation of a simple and energy efficient thermodynamic cycle framework is essential for combined output systems newline