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Performance enhancement of waste heat extraction from generator of a wind turbine for freshwater production via employing various nanofluids

Rostamzadeh, H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.desal.2019.114244
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. Water shortage issues are growing through the globe at higher rate than population growth. On the bright side, various methods are devised to capture energy from renewable energy or waste heat from different sectors. Among all inspected approaches, waste heat capturing through cooling process of the wind turbines' generators for desalination at small scale is paid less attention. However, in large wind farms, the scale of this dissipated thermal heat becomes appreciable which can drive several desalination units. Due to the above-pointed facts, the waste heat of a wind turbine with nominal capacity of 7358 kW and height of 24 m for desalinating seawater is inspected here, using a humidification-dehumidification (HDH) unit. Also, five nanoparticles of Cu, CuO, TiO2, Al2O3, and SiO2 with base fluid of water are used through the cooling process of the wind turbine's generator in order to produce more freshwater. The devised set-up is evaluated in terms of the first and second laws of thermodynamics for different selected nanofluids. It is found that wind turbine has the highest exergy destruction of 1125 kW, followed by heater. Also, the total exergy destruction (for all nanofluids) is calculated approximately 1387 kW. Also, among all employed nanoparticles, Cu/water mixture has the highest performance since it produces more freshwater, while SiO2/water mixture has the lowest performance. Moreover, the total energy efficiency reaches its maximum value in the range of 26.25–26.5% at wind speed of 11.5 m/s. © 2019 Elsevier B.V
  6. Keywords:
  7. Humidification-dehumidification (HDH) system ; Nanofluid ; Thermodynamic analysis ; Alumina ; Aluminum oxide ; Copper oxides ; Desalination ; Energy efficiency ; Exergy ; Humidity control ; Mixtures ; Nanoparticles ; Population statistics ; Silica ; SiO2 nanoparticles ; Thermoanalysis ; TiO2 nanoparticles ; Titanium dioxide ; Waste heat ; Wind ; Wind power ; Wind turbines ; Desalination units ; Exergy destructions ; Humidification-dehumidification ; Nanofluids ; Nominal capacities ; Performance enhancements ; Second laws of thermodynamics ; Thermo dynamic analysis ; Nanofluidics ; Experimental study ; Heat transfer ; Nanoparticle ; Pollutant removal ; Thermodynamics ; Waste treatment ; Wind turbine
  8. Source: Desalination ; Volume 478 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0011916419310239