The Influence of Tio2 Nanoparticles and Libr on the Exergy Efficiency of Ammonia Absorption Refrigeration System under Different Working Temperatures

Abstract

The addition of TiO 2 nanoparticles and LiBr can increase the coefficient of performance(COP) of the ammonia water absorption, but the exergy efficiency has not been investigated. Therefore, this paper studied the influence of TiO 2 nanoparticles and LiBr on the exergy efficiency under different working temperatures. The results show that the addition of TiO 2 nanoparticles or LiBr can improve the ECOP of the ammonia-water absorption refrigeration system. There is optimal T gen , T eva for the NH 3 -H 2 O-LiBr-TiO 2 working fluid, which is 110℃, -13℃. In comparison, the ECOP decreases with the T cw increases. The maximum value of ECOP in this paper is 0.266 when the T eva , T gen , and T cw are -13℃, 110℃, and 28℃. Generally, applying NH 3 -H 2 O -LiBr -TiO 2 nanofluid working fluid can efficiently improve the ECOP of the absorption refrigeration system.