Economic and Exergy Analysis of TiO 2 + SiO 2 Ethylene-Glycol-Based Hybrid Nanofluid in Plate Heat Exchange System of Solar Installation

Sylwia Wciślik () and Dawid Taler
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Sylwia Wciślik: Department of Building Physics and Renewable Energy, Faculty of Environmental Engineering, Geodesy and Renewable Energy, Kielce University of Technology, Aleja Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Dawid Taler: Faculty of Environmental Engineering and Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland

Energies, 2024, vol. 17, issue 13, 1-32

Abstract: This paper concerns an economic and exergetic efficiency analysis of a plate heat exchanger placed in a solar installation with TiO 2 :SiO 2 /DI:EG nanofluid. This device separates the primary circuit—with the solar fluid—and the secondary circuit—in which domestic hot water flows (DHW). The solar fluid is TiO 2 :SiO 2 nanofluid with a concentration in the range of 0.5–1.5%vol. and T = 60 °C. Its flow is maintained at a constant level of 3 dm 3 /min. The heat-receiving medium is domestic water with an initial temperature of 30 °C. This work records a DHW flow of V ˙ D H W , i n = 3–6(12) dm 3 /min. In order to calculate the exergy efficiency of the system, first, the total exergy destruction, the entropy generation number N s , and the Bejan number Be are determined. Only for a comparable solar fluid flow, DHW V ˙ n f = V ˙ D H W 3 dm 3 /min, and concentrations of 0 and 0.5%vol. is there no significant improvement in the exergy efficiency. In other cases, the presence of nanoparticles significantly improves the heat transfer. The TiO 2 :SiO 2 /DI:EG nanofluid is even a 13 to 26% more effective working fluid than the traditional solar fluid; at Re = 329, the exergy efficiency is η e x e r g y = 37.29%, with a nanoparticle concentration of 0% and η e x e r g y (1.5%vol.) = 50.56%; with Re = 430, η e x e r g y (0%) = 57.03% and η e x e r g y (1.5%) = 65.9%.

Keywords: nanofluids; plate heat exchanger; exergy; solar installation; simple pay back time; domestic hot water (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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