The simulation of a LiBr-H2O absorber using a porous fiber
for the heat and mass transfer between the liquid solution and the
refrigerant vapour is considered. Heat and mass transfer
processes are modeled by means of selected correlations and data
gathered from the open literature. For the case considered in this
study, the absorber channels are 5 cm length. We evaluate the
ratio between the volume of the absorber and the cooling
capacity in a complete chiller, producing a reduction in size in
the order of 1.5 times the usual values found in falling film
absorption using conventional shell and tubes heat exchangers.
The simulated membrane absorber is integrated in a single
effect lithium bromide–water absorption chiller which
performance is evaluated. The variable parameters are the
external driving temperatures: final temperature in the desorber,
the cooling temperature of the external fluid in the absorber and
the condenser and the evaporating temperature.
The coefficient of performance (COP) obtained varies from
0.5 to 0.8 for cooling duties ranging between 4 W and 7 W. The
chiller response to different circulated solution mass flow rates
is also presented.
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .