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research-article

Experimental Study on the Enhancement of Mass Transfer Utilizing Fe3O4 Nanofluids

[+] Author and Article Information
Lianying Zhang

Group of the Building Energy & Sustainability Technology, Shaanxi Engineering Research Center of Building Environment and Energy, School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
zhangly@xjtu.edu.cn

Yuanyuan Liu

Group of the Building Energy & Sustainability Technology, School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
luckyyuan@stu.xjtu.edu.cn

Yuan Wang

Group of the Building Energy & Sustainability Technology, School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
wangyuan0627@stu.xjtu.edu.cn

Liwen Jin

Group of the Building Energy & Sustainability Technology, Shaanxi Engineering Research Center of Building Environment and Energy, School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
lwjin@xjtu.edu.cn

Qunli Zhang

Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, No. 1, Zhanlanguan Road, Xicheng District, Beijing, 100044, P.R. China
zhangqunli@bucea.edu.cn

Wenju Hu

Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, No. 1, Zhanlanguan Road, Xicheng District, Beijing, 100044, P.R. China
huwenju@bucea.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4037398 History: Received July 05, 2016; Revised June 29, 2017

Abstract

The absorption air-conditioning system is a low power consumption, low noise and good for balancing the electricity peak-valley system. It can be driven by low grade energy, such as solar energy and industrial exhaust heat. The nanofluids, which possess the superior thermophysical properties, exhibit a great potential in enhancing heat and mass transfer. In this paper, nanofluids of H2O/LiBr with Fe3O4 nanoparticles were introduced into absorption air conditioning system. The effects of critical parameters, such as the flow rate of H2O/LiBr nanofluids, nanoparticle size and mass fraction, on the falling film absorption were investigated. The H2O/LiBr nanofluids with Fe3O4 nanoparticle mass fractions of 0.01 wt%, 0.05 wt% and 0.1 wt%, and nanoparticle sizes of 20 nm, 50 nm and 100 nm were tested. The results imply that the vapor absorption rate could be improved by adding nanoparticles to H2O/LiBr solution. The smaller the nanoparticle size, the greater enhancement of the heat and mass transfer. The absorption enhancement ratio increases sharply at first by increasing the nanoparticle mass fraction within a range of relatively low mass fraction, and then exhibits a slow growing even reducing trends with increasing the mass fraction further. For Fe3O4 nanoparticle mass fraction of 0.05 wt% and nanoparticle size of 20 nm, the maximum mass transfer enhancement ratio is achieved about 2.28 at the flow rate of 100 L·h-1. Meanwhile, a fitting formula of mass transfer enhancement ratio for Fe3O4 nanofluids has been improved.

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