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|Title: ||A theoretical and experimental investigation of an absorption refrigeration system for application with solar energy units|
|Authors: ||Dalichaouch, Mahieddine|
|Issue Date: ||1989 |
|Publisher: ||Newcastle University|
|Abstract: ||Application of the second law of thermodynamics to refrigeration systems
is useful in identifying the thermodynamic losses and in finding out where improvements
might be made.
Theoretical absorption refrigeration cycles are analysed using the first law-based
equations of energy balances and the second law-based concept of lost work.
A thermodynamic efficiency, defined and formulated from the lost work approach,
is used to examine a lithium bromide -water absorption cooling cycle
with hot water as the heat source and cooling water as the heat sink. The
cycle parameters are varied over applicable operating ranges in order to find
their effect on the cycle thermodynamic efficiency. To accomplish this objective
and to make a parameteric analysis for the L iBr -water absorption cycle under
steady-state conditions, two computer programmes are written. The results indicate
the system might be improved by better design. The efficiency variation
is compared to variations of coefficient of performance found in the literature.
A LiBT -water absorption refrigeration system for low hot water temperature applications
has been proposed and detailed design aspects have been considered.
Fabrication and testing of a laboratory model of the absorption refrigeration
system have been described.
As new design methodologies of solar energy applications have been developed
recently, a study of solar thermal systems for absorption refrigeration has been
presented. This includes the classification, description and modelling of solar
Types of design procedures of solar systems for absorption refrigeration are discussed
and a computer programme has been implemented which prints out the
yearly solar fraction of a solar thermal system with daily storage for supplying
heat to an absorption cooling cycle. Numerical performance tests are carried
out and the results show that the phibar-f chart design method is a simple and
convenient mean of predicting the thermal performance of solar systems.|
|Description: ||PhD Thesis|
|Appears in Collections:||School of Mechanical and Systems Engineering|
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