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Dev R.,Indian Institute of Technology Delhi | Abdul-Wahab S.A.,Sultan Qaboos University | Tiwari G.N.,BAG Energy Research Society
Applied Energy | Year: 2011

In this communication, an experimental study of inverted absorber solar still (IASS) and single slope solar still (SS) at different water depth and total dissolved solid (TDS) is presented. Experiments are conducted for the climatic condition of Muscat, Oman. A thermal model is also developed for the IASS and validated with experimental results. A fair agreement is found for the daytime operation of the IASS. It is observed that higher water temperature can be achieved by using the IASS in comparison to the SS. The daily yield obtained from the IASS are 6.302, 5.576 and 4.299kg/m2-day at water depths (dw) 0.01, 0.02 and 0.03m respectively. At same respective water depths, the daily yield obtained from the SS are 2.152, 1.931, 0.826kg/m2-day respectively lower than that of the IASS. It is observed that for climatic condition of Muscat, Oman, the optimum water depth for the IASS is 0.03m above which the addition of reflector under the basin does not affect its performance much more in comparison to that of the SS for sea water. The feed saline water and yielded distilled water are also compared for different TDS values, pH, and electrical conductance. On the basis of economic analysis of IASS, it is found that the annualized cost of distilled water in Indian rupees for Muscat climatic condition is Rs. 0.74, 0.66 and 0.62 (conversion factors: $ 1=Rs. 50 and 1 OMR=Rs. 120) for the life time of 15, 20 and 25years respectively. © 2010 Elsevier Ltd. Source


Atheaya D.,Indian Institute of Technology Delhi | Tiwari A.,BAG Energy Research Society | Tiwari G.N.,Indian Institute of Technology Delhi | Al-Helal I.M.,King Saud University
Applied Energy | Year: 2016

In this paper, a new design of a glazed and an unglazed inverted absorber partially covered photovoltaic thermal compound parabolic concentrator (PVT-CPC) water collector has been proposed. The performance of proposed systems has been compared with partially covered inclined and horizontal PVT-CPC water collector systems for constant mass flow rate mode. Analytical expressions for the outlet fluid temperature (Tfo1) and electrical efficiency of the proposed systems have been derived and presented. Based on the analytical thermal model, a software program has been developed in MATLAB 2010a to determine the outlet fluid temperature, electrical efficiency, thermal energy, electrical energy and overall exergy efficiency of the systems. The results showed that the glazed inverted absorber partially covered PVT-CPC water collector system exhibited higher values of instantaneous thermal efficiency. Further, the glazed inverted absorber partially covered PVT-CPC system is more suitable for higher thermal energy. However, the partially covered inclined PVT-CPC water collector is more favourable for electrical energy requirements. Further, the inverted absorber partially covered PVT-CPC system is cost effective. © 2016 Elsevier Ltd. Source


Singh S.,CMS Government Girls Polytechnic Daurala | Singh S.,Subharti University | Agrawal S.,The New School | Tiwari A.,BAG Energy Research Society | And 2 more authors.
Solar Energy | Year: 2015

The PV research community and industry has major focus on the new advancement and improvement on power efficiency of PV systems. An attempt has been made to model and optimize the parameter of hybrid single channel photovoltaic thermal (PVT) module. In this paper it has been observed that there are many parameters that affect the electrical efficiency of a hybrid single channel PVT module like thickness of the glass and tedlar, temperature of the inlet flow, and solar cell temperature. All equations for solar cell and thermal collector have been derived. By using genetic algorithms (GAs), thermal efficiency and electrical efficiency of the system may be optimized. All the parameters that are used in genetic algorithms are the parameters that could be changed, and the non changeable parameters, like solar radiation cannot be used in the algorithm. It has been observed that the GAs are very efficient technique to estimate the design parameters of hybrid single channel PVT module. © 2015 Elsevier Ltd. Source


Abdul-Wahab S.A.,Sultan Qaboos University | Al-Hinai H.,The Research Council | Dev R.,BAG Energy Research Society | Tiwari G.N.,BAG Energy Research Society
Desalination and Water Treatment | Year: 2010

In this communication, an experiment based study of an inverted absorber solar still (IASS) conducted in Muscat, Oman is presented. An IASS is an improved design of a single slope solar still with a curved reflector under the basin. This arrangement helps in more heating of the basin of a solar still from both sides (i.e. top and bottom surfaces) directly and indirectly. The reflector under the basin adds additional heat to increase temperatures of the basin, water and condensing glass cover than that of a conventional single slope solar still. Experimental results show that the productivity of an inverted absorber solar still is more than 3.5 l/m2 in duration of 12 h, i.e. 7:00 AM-7:00 PM. It is also found that IASS is not capable of holding thermal energy for long duration after 16:00. The thermal storage is lost to ambient through incased air under the basin when the amount of reflected solar radiation reduces. Hence, it is recommended to have an insulation layer under the basin to utilize thermal storage occurred during the day for the evaporation to get more yield per day. © 2010 Desalination Publications. All rights reserved. Source

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