Analysis and Design of Hybrid Double-Absorption Cooling Systems for Low Grade Thermal Energy Applications

Abstract

A hybrid double-absorption system using LiCL-H2 O solution as a working fluid is proposed in this paper. This system can operate at low source temperature (55–80°C), requires lower blower power than a desiccant system, and has a higher system C.O.P. A modification of this system, a double absorption-evaporation system that provides even higher C.O.P. is also proposed. Both closed and open regeneration of the working fluid are considered in the system design. Performance equations for these hybrid systems are presented. A computer code HYBRID is written to do parametric analyses for these systems under steady-state conditions. The operating range and optimum design conditions are determined through both theoretical analysis and computer simulation. It is shown that these hybrid absorption systems have definite advantages over conventional absorption and desiccant systems for low grade thermal energy applications.