Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids

Abstract This study presents a novel parametric investigation into the performance of a district cooling system using mono (Al2O3 and TiO2) and hybrid (Al2O3–TiO2) nanoparticles in the base fluids of water and ethylene–glycol water (EG-water) at a 20:80 ratio. The study analyses the effect of variab...

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Autores principales:	Eric C. Okonkwo, Tareq Al-Ansari
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c3b944754810419c8d28c319bfc8452c
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spelling	oai:doaj.org-article:c3b944754810419c8d28c319bfc8452c2021-12-02T19:16:46ZParametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids10.1038/s41598-021-98754-72045-2322https://doaj.org/article/c3b944754810419c8d28c319bfc8452c2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98754-7https://doaj.org/toc/2045-2322Abstract This study presents a novel parametric investigation into the performance of a district cooling system using mono (Al2O3 and TiO2) and hybrid (Al2O3–TiO2) nanoparticles in the base fluids of water and ethylene–glycol water (EG-water) at a 20:80 ratio. The study analyses the effect of variables such as secondary fluid flow rate, evaporator and inlet temperatures, nanoparticle concentration, and air flowrate on the COP, total electrical energy consumption, and design of the district cooling unit. The analysis is performed with a thermal model developed and validated using operations data obtained from the McQuay chilled water HVAC unit operating in one of the facility plants at the Education City campus. The results of the study show that the use of nanofluids increased the overall heat transfer coefficient in the system by 6.6% when using Al2O3–TiO2/water nanofluids. The use of nanofluids in the evaporator also led to an average reduction of 23.3% in the total work input to the system and improved the COP of the system by 21.8%, 20.8% and 21.6% for Al2O3–TiO2/water, Al2O3/water, and TiO2/water nanofluids, respectively. Finally, an enhancement of 21.6% in COP was recorded for Al2O3–TiO2/EG-water nanofluids at a 5% nanoparticle volume concentration.Eric C. OkonkwoTareq Al-AnsariNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-19 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eric C. Okonkwo Tareq Al-Ansari Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
description	Abstract This study presents a novel parametric investigation into the performance of a district cooling system using mono (Al2O3 and TiO2) and hybrid (Al2O3–TiO2) nanoparticles in the base fluids of water and ethylene–glycol water (EG-water) at a 20:80 ratio. The study analyses the effect of variables such as secondary fluid flow rate, evaporator and inlet temperatures, nanoparticle concentration, and air flowrate on the COP, total electrical energy consumption, and design of the district cooling unit. The analysis is performed with a thermal model developed and validated using operations data obtained from the McQuay chilled water HVAC unit operating in one of the facility plants at the Education City campus. The results of the study show that the use of nanofluids increased the overall heat transfer coefficient in the system by 6.6% when using Al2O3–TiO2/water nanofluids. The use of nanofluids in the evaporator also led to an average reduction of 23.3% in the total work input to the system and improved the COP of the system by 21.8%, 20.8% and 21.6% for Al2O3–TiO2/water, Al2O3/water, and TiO2/water nanofluids, respectively. Finally, an enhancement of 21.6% in COP was recorded for Al2O3–TiO2/EG-water nanofluids at a 5% nanoparticle volume concentration.
format	article
author	Eric C. Okonkwo Tareq Al-Ansari
author_facet	Eric C. Okonkwo Tareq Al-Ansari
author_sort	Eric C. Okonkwo
title	Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
title_short	Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
title_full	Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
title_fullStr	Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
title_full_unstemmed	Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
title_sort	parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c3b944754810419c8d28c319bfc8452c
work_keys_str_mv	AT ericcokonkwo parametricinvestigationofachilledwaterdistrictcoolingunitusingmonoandhybridnanofluids AT tareqalansari parametricinvestigationofachilledwaterdistrictcoolingunitusingmonoandhybridnanofluids
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Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids

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