An Optimizing Method for Preparing Natural Refrigerant: Ammonia-water Nanofluids

作者：Yang Liu; Du Kai^*

来源：Integrated Ferroelectrics, 2013, 147(1): 24-33.

DOI：10.1080/10584587.2013.790278

• Optimizing method
• natural refrigerant
• binary nanofluids
• ammonia water
• dispersion

In order to apply the technique that nano-particles enhance the heat and mass transfer to the ammonia-water absorption refrigeration, several types of ammonia water nanofluids were prepared by two-step method. An optimizing method for preparation binary nanofluids is proposed in this paper, which is conducted by removing the well dispersed nanofluids from the suspensions with higher concentrations and regaining the required concentrations of nanofluids based on ratio of varying absorbency. The performance of the optimizing method on dispersion situation of nanofluids is evaluated by observing sedimentation and measuring the absorbency. The results show that the dispersion situation of SiC, TiN, TiO2 nanofluid mainly depends on the dispersive characteristics and hydrophilicity of nanoparticles when the PH value of basefluid is fixed and no dispersant is added. Al2O3, Fe2O3, ZnFe2O4 nanoparticles are hardly to disperse in ammonia water directly but their dispersion situations can be greatly improved by adding proper dispersants. For both binary nanofluids with and without dispersant, the dispersion stabilities are greatly improved after the optimization treatment.

• 出版日期2013-1-1
• 单位东南大学