1,722,076 research outputs found
A bright future for heritage buildings. How to promote energy efficient retrofitting measures
No full textEnergy efficient retrofitting in practice. Challenges and opportunities of three heritage buildings in Europe.
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Energie en Klimaat in de Verkiezingsprogramma's van de Nederlandse Politieke Partijen
No full textOm de klimaatdoelstellingen van Parijs te halen zal het Nederlandse klimaatbeleid moeten worden aangescherpt. Hoewel politici zich vrijwel unaniem verenigd hebben achter klimaatneutraliteit in 2050, variëren de ideeën van de afzonderlijke partijen over wat er de komende vier jaar moet gebeuren van steekhoudend, via goedbedoeld of naïef tot afhoudend, afwachtend en ontkennend. In dit essay (tevens beschikbaar in pdf) probeert Gert Jan Kramer, hoogleraar duurzame energievoorziening, de patronen te ontdekken in dit patchwork van meningen en voorstellen, en plaatst hij de huidige ambities in het licht van dertig jaar klimaatbeleid
Techno-economic assessment of micro-algae as feedstock for renewable bio-energy production
No full textThis paper determines the energy consumption ratio and overall bio-energy production costs of microalgae cultivation, harvesting and conversion to secondary energy carriers, thus helping to clarify future perspectives of micro-algae production for energy purposes. A limitation growth model is developed, which determines the productivity of micro-algae for different climate profiles. Total direct and indirect energy consumption ratios for the production of heat, fuels and electricity derived from micro-algae are calculated. Overall direct energy consumption ratio for raceway ponds is 0.06 for the optimal case, indirect energy consumption ratio for that case is 0.74. Direct energy consumption ratio in horizontal tubular systems is 0.32 for the optimal case, indirect energy consumption ratio for that case is 117. The implementation of different improvement options could reduce the indirect energy consumption ratio by fifty percent for both raceway ponds and horizontal tubular systems in the optimistic scenario. Prominent elements of the energy consumption ratios are carbon dioxide supply for raceway ponds and circulation power consumption for horizontal tubular systems. The lower end of fuel production cost calculated for raceway ponds is 136 €2010/GJ and 153 €2010/GJ for horizontal tubular systems (non-renewable gasoline and diesel is about 5–20 €/GJ). Considering possible improvement options overall bio-energy production costs could be reduced by one-fourth. Current results suggest that micro-algae cultivation is not suitable for dedicated bio-energy production in considered cultivation, harvesting and conversion options. Coproduction of bio-energy with high-value products are more viable, but is not considered in this research. 2012 Elsevier Ltd. All rights reserved
Review on techniques, tools and best practices for energy efficient retrofitting on heritage buildings
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