Modeling humid air condensation in waste natural gas-powered atmospheric water harvesting systems

被引：31

作者：

Ozkan, Onur ^{[1
]}

Wikramanayake, Enakshi D. ^{[1
]}

Bahadur, Vaibhav ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA

来源：

APPLIED THERMAL ENGINEERING | 2017年 / 118卷

关键词：

Condensation; Heat exchanger; Refrigeration; Atmospheric water harvesting; Flaring; Natural gas; HEAT-TRANSFER; DROPWISE; SURFACES; DESIGN; VAPOR; STEAM; FOG;

D O I：

10.1016/j.applthermaleng.2017.02.096

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

4% of the natural gas produced globally is flared at oilfields due to the absence of gas handling infrastructure and unfavorable economics. Recent work has proposed the utilization of this excess gas for atmospheric water harvesting (AWH) for oilfield operations, wherein gas-powered refrigeration cycles generate the cooling capacity for large scale dehumidification, via condensation. This work develops an indepth, comprehensive, analytical modeling framework to predict the water condensation in waste gas-powered AWH systems. Firstly, gas powered refrigeration systems are analyzed to identify key system parameters and considerations. Secondly, an analytical model is developed to capture the complex heat and mass transfer phenomena associated with condensation of humid air in a fin and tube heat exchanger. This involves using heat and mass transfer relations to estimate the dehumidification process line. The model can predict the water condensation rate as a function of the gas flow rate, ambient weather and the refrigeration system utilized. The model is used to predict flared gas-based water harvests in the Eagle Ford (Texas) and Bakken (North Dakota) Shale oilfields, which account for the majority of US flaring. Results indicate that 1 cubic meter of natural gas can condense 23 and 0.65 gallons water (on an annual average basis) in Texas and North Dakota, respectively. The weather-dependent condensation rates range from 3 to 10 (Texas) and 0 to 0.8 (North Dakota) gallons/day/square meter of condenser area. Overall, flared gas-based AWH can utilize 77% and 40% of the excess gas in Texas and North Dakota, respectively. This work analyzes various aspects of humid air condensation and evaluates the sensitivity of the condensation rate to key engineering parameters. Overall, this work develops the foundational modeling tool to predict the performance of all types of humid air condensation systems. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：224 / 232

页数：9

共 29 条

[1] Hydrophobic surfaces for control and enhancement of water phase transitions [J].

Alizadeh, Azar ;

Bahadur, Vaibhav ;

Kulkarni, Ambarish ;

Yamada, Masako ;

Ruud, James A. .

MRS BULLETIN, 2013, 38 (05) :407-411

[2] Three-Dimensional Hierarchical Structures for Fog Harvesting [J].

Andrews, H. G. ;

Eccles, E. A. ;

Schofield, W. C. E. ;

Badyal, J. P. S. .

LANGMUIR, 2011, 27 (07) :3798-3802

[3]

[Anonymous], 2016, R D MAGAZINE

[4]

[Anonymous], 2016, ASME MECH ENG MA MAR

[5] Flare gas recovery for algal protein production [J].

Beal, Colin M. ;

Davidson, F. Todd ;

Webber, Michael E. ;

Quinn, Jason C. .

ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS, 2016, 20 :142-152

[6] Condensation from pure steam and steam-air mixtures on integral-fin tubes in a bank [J].

Briggs, A ;

Sabaratnam, S .

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2005, 127 (06) :571-580

[7] The effect of relative humidity on dropwise condensation dynamics [J].

Castillo, Julian E. ;

Weibel, Justin A. ;

Garimella, Suresh V. .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2015, 80 :759-766

[8]

Cermak J., 2013, ASHRAE J APR

[9]

Dusty H., 2014, FLAMES US SHALE BOOM

[10]

Freyman M., 2014, Hydraulic Fracturing Water Stress: Water Demand by the Numbers

← 1 2 3 →