Evaluation of physical and thermal properties of coal combustion residue blended concrete for energy efficient building application in India

Ghosh, Avijit; Ghosh, Arup; Neogi, Subhasis

doi:10.1080/17512549.2018.1557076

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…A comprehensive analysis of previous designs and material availability yielded cement mixed with combusted charcoal (or ash) as the optimal insulator. The resulting insulation system presents a thickness of 25 mm, with a 1:2:4 Cement: Bottom Ash: Stone Aggregate Ratio, yielding a U value of 2.39 W/m 2 K [82]. In addition to providing a low cost and environmentally friendly option for thermal performance, the design includes an overextension at the bottom of the insulating layer on 4 different symmetrical locations in order to fix it to the ground and increase structural reliability.…”

Section: Reactor Designmentioning

confidence: 99%

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Caputo

Mašek

2021

Energies

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Energy access and waste management are two of the most pressing developmental and environmental issues on a global level to help mitigate the accelerating impacts of climate change. They are particularly relevant in Sub–Saharan Africa where electrification rates are significantly below global averages and rural areas are lacking a formal waste management sector. This paper explores the potential of integrating solar energy into a biomass pyrolysis unit as a potentially synergetic solution to both issues. The full design of a slow pyrolysis batch reactor targeted at biochar production, following a strict cost minimization approach, is presented in light of the relevant considerations. SPEAR is powered using a Cassegrain optics parabolic dish system, integrated into the reactor via a manual tracking system and optically optimized with a Monte-Carlo ray tracing methodology. The design approach employed has led to the development an overall cost efficient system, with the potential to achieve optical efficiencies up 72% under a 1.5° tracking error. The outputs of the system are biochar and electricity, to be used for soil amendment and energy access purposes, respectively. There is potential to pyrolyze a number of agricultural waste streams for the region, producing at least 5 kg of biochar per unit per day depending on the feedstock employed. Financial assessment of SPEAR yields a positive Net Present Value (NPV) in nearly all scenarios evaluated and a reasonable competitiveness with small scale solar for electrification objectives. Finally, SPEAR presents important positive social and environmental externalities and should be feasibly implementable in the region in the near term.

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Section: Reactor Designmentioning

confidence: 99%