Cold generation systems with absorption cycles.
A review is presented on the technology, thermodynamics, applications and
economics of absorption cycles such as refrigeration, heat pumps and temperature
amplifiers; single and multistage cycles, and systems into which they are integrated
From this present situation the fundamental thermodynamics of ideal absorption
refrigeration is established for single, double and multistage cycles. An exergy analysis
is used to prove this theory. The ideal absorption cycle theory is developed to cover
absorption heat pumps, cooling with heat recovery, temperature amplifiers and hybrid
systems incorporating vapour compression and absorption machines.
Having proved absorption cycles to be comprised of Carnot cycles (direct and
reverse), this theory was then merged with Carnot driving and cooling cycles' theory
to establish a universal law of cold generation cycles. These are combinations of
driving and cooling cycles for which the main pmpose is to produce cooling from a
combustion driven cycle.
The applications and economic evaluations of real direct fired absorption chillers, cold
generation systems and the application of absorption chillers to combined heat and
power (CHP) systems are analysed. Direct fired chillers have been proved to be
economically feasible. The analysis of cold generation cycles indicated the feasibility
of certain plant configurations. For the CHP analysis, the exergy costing method was
seen to be the most appropriate one for determining the most cost effective
A review of thermoeconomics applied to an air conditioning system with absorption
and CHP is presented. Thermoeconomics was shown to be an appropriate method for
optimising systems where absorption cycles are applied.
Finally theoretical, practical and economic conclusions are presented regarding the
equivalence of vapour compression and absorption cycles.