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Tilting a thermal store lifts its exergy efficiency by eight points
Geometry is a free variable in thermal storage. Inclining a paraffin shell-and-tube store changes the natural convection field enough to move exergy efficiency by several points.
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Sensible against latent: a packed bed puts the two storage routes side by side
Most storage comparisons are made across papers, rigs and assumptions. This one holds the hardware fixed and swaps only the medium.
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Hydrogen or ammonia from residues: an exergy and environmental comparison
Residual biomass can be turned into hydrogen or into ammonia. The two routes look similar on a mass balance and quite different on an exergy balance.
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Maize cobs in a concentric tube reactor: allothermal gasification assessed on exergy
Allothermal gasification supplies process heat from outside the bed. The exergy balance shows what that architecture buys, and what the external heat costs.
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Graphene nanoplatelet nanofluid pushes a solar collector to 85.5% exergy efficiency
A small mass fraction of graphene nanoplatelets raises both thermal and exergy efficiency, and cuts entropy generation, in a working rooftop collector.
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Graphene phase change composites: conductivity without losing the latent heat
Phase change materials store a great deal of heat and move it slowly. Graphene scaffolds attack the second problem, at some cost to the first.
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Exergy accounting: four methods, four answers, one economy
National exergy studies disagree partly because economies differ and partly because analysts count differently. This paper separates the two.
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Mexico 1971–2009: what a useful exergy series says about an energy transition
Primary energy statistics show consumption. A useful exergy series shows how much of it became work, and where the gains stopped.
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A cookstove that also makes electricity: 15% exergy efficiency from an annular thermoelectric
Cooking is one of the most exergy-destructive activities on the planet. Bolting a thermoelectric ring onto the stove recovers a fraction of the loss.
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Invasive weeds as feedstock: hydrogen-enriched producer gas, costed and exergy-audited
Invasive species are cleared at public expense. Gasifying the arisings turns a disposal cost into a gas stream — if the exergy balance holds up.
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Exergy destruction mapped across 62 cement kilns
A multi kiln study quantifies where exergy is destroyed in clinker production and identifies the largest improvement opportunities.
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