TITLE:
Magnetic Field Enhancement in Ammonia-Water Absorption Refrigeration Systems
AUTHORS:
Moradeyo K. Odunfa, Richard O. Fagbenle, Olanrewaju M. Oyewola, Olayinka S. Ohunakin
KEYWORDS:
Ammonia-Water Absorption Refrigeration, Magnetic Field Force, Ammonia Solution Concentration, Coefficient of Performance, Finite Difference Scheme, Numerical Solution
JOURNAL NAME:
Energy and Power Engineering,
Vol.6 No.4,
April
22,
2014
ABSTRACT: Absorption
enhancement has been considered as an effective
way of improving coefficient of performance
(COP) of refrigeration systems and magnetic enhancement is one of these
methods. A model of magnetic field enhancement in ammonia-water absorption systems
is presented in this paper. A numerical model using finite difference scheme
was developed based on the conservation equations and mass transport
relationship. Macroscopic magnetic field force was introduced in the momentum
equation. The model was validated using data obtained from the literature. Changes in the physical properties of ammonia
solution while absorbing both in the direction of falling film and across its
thickness were investigated. The magnetic field was found to have some positive
effect on the ammonia-water falling film absorption. The results indicate that
absorption performance enhancement increased with magnetic intensity. The COP
of simple ammonia solution absorption refrigeration system increased by 1.9%
and 3.6% for magnetic induction of 1.4 and 3.0 Tesla respectively.