Analytical characteristic equation of nanofluid loaded active double slope solar still coupled with helically coiled heat exchanger. (1st March 2017)

• Record Type: Journal Article
• Authors: Sahota, Lovedeep; Shyam, ; Tiwari, G.N.
• Is Part Of: Energy conversion and management. Volume 135(2017)
• Page Start: 308
• Page End: 326
• Publication Date: 2017-03-01
• Subjects: Active solar still -- Nanofluid -- Heat exchanger -- Thermal energy and exergy efficiency; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2016.12.078
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Active DSSS with and without operating helical HE has been studied using BF and NF. Characteristic equation has been developed for both the proposed systems. Performance of both the systems has been compared using characteristic curve. Abstract: Nanofluids are embryonic fluids and promising thermal energy carrier in solar thermal applications due to their superior thermo-physical and optical properties. In present communication, an analytical expression of the characteristic equation of two different systems viz. (A) active double slope solar still coupled with series connected partially covered N photovoltaic thermal flat plate collectors (N-PVT-FPC) and operating without helical heat exchanger; and (B) active double slope solar still coupled with series connected partially covered N-PVT-FPC and operating with helical heat exchanger has been developed. Analysis has been executed for 0.25 % concentration of CuO, Al2 O3, TiO2 -metallic nanoparticles; four number of collectors; 100 kg basin fluid (BF/NF) mass and 0.03 kg/s mass flow rate. The maximum values of instantaneous gain thermal energy efficiency ( CuO 80.18 % ; Al 2 O 3 71.67 % ; TiO 2 74.92 % ) and instantaneous loss thermal energy efficiency ( CuO 64.12 % ; Al 2 O 3 59.11 % ; TiO 2 64.77 % ) of the system (A) are found to be significantly higher in comparison the basefluid ( gain 66.81 % ;loss 52.42 % ) . The productivity of system (A) and system (B) are ( CuO 32 % ; Al 2 O 3 19.23 % ; TiO 2 6.47 % ) and ( CuO 31.49 % ; Al 2 O 3 26.4 % ; TiO 2 7.26 % ) respectively, higher in comparison to the case using basefluid (water). Moreover, thermal energy and exergy; and thermal exergy efficiency has been evaluated for both the systems.