This article aims to enhance the efficiency of Diffusion Absorption Refrigeration (DAR) systems which operate at low efficiency. This study experimentally investigates the effect of passive heat transfer enhancement by using various nanofluids as working fluids including ammonia/water couple with different rates of magnesium oxide aluminate spinel (MgOAl₂O₃) particles. The tests have been carried at the same ambient conditions to obtain reliable results. Additionally, nanofluid has been prepared and tested in two different particle concentration (1% and 2%). Adding nanoparticles to the base fluid (25% ammonia/water) can make an important positive effect in increasing heat transfer by extending surface area and heat capacity of the fluid. Experimental results showed that using nanofluid as working fluid in DAR system results in faster evaporation which decreases operation time and increases heat transfer in generator. Moreover, the DAR system containing 2% concentration of nanofluid solution led to a 37.4% increase in performance coefficient (COP) and a 44.2% increase in exergetic performance coefficient (ECOP) compared to the DAR system without nano particles.

本文旨在提高以低效率运行的扩散吸收式制冷（DAR）系统的效率。这项研究实验研究了通过使用各种纳米流体作为工作流体（包括氨/水以及不同比例的氧化镁铝酸盐尖晶石（MgOAl ₂ O ₃） 粒子。在相同的环境条件下进行测试以获得可靠的结果。另外，已经制备并以两种不同的颗粒浓度（1％和2％）测试了纳米流体。通过增加流体的表面积和热容量，将纳米颗粒添加到基础流体中（25％氨/水）可以在增加热传递方面起到重要的积极作用。实验结果表明，在DAR系统中使用纳米流体作为工作流体会导致更快的蒸发，从而减少运行时间并增加发生器中的热传递。此外，与没有纳米颗粒的DAR系统相比，包含2％浓度的纳米流体溶液的DAR系统导致性能系数（COP）增长37.4％，运动能力系数（ECOP）增长44.2％。