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CACAMMThe Compressed-Air Car Analysis Meta-Model (CACAMM) was developed by Felix Creutzig. The paper on this model is published in Environmental Research Letters. Use the link below to download the spreadsheet model.NEW: Version 2.0 specifies the smart fortwo and smart fortwo ed as reference cars and contains a sensitivity analysis with respect to power plant mix. Download the model (version 2.0) (1.0 MB) Contains calculations and explanations on the first sheet, output graphics on the second sheet. (Released Nov 2, 2009) Requires Microsoft Excel or work-alike. The paper
F. Creutzig, A. Papson, L. Schipper, D. Kammen (2009) Abstract. Climate change and energy security require a reduction in travel demand, a modal shift, and technological innovation in the transport sector. Through a series of press releases and demonstrations, a car using energy stored in compressed air produced by a compressor has been suggested as an environmentally friendly vehicle of the future. We analyze the thermodynamic efficiency of a compressed-air car powered by a pneumatic engine and consider the merits of compressed air versus chemical storage of potential energy. Even under highly optimistic assumptions the compressed-air car is significantly less efficient than a battery electric vehicle and produces more greenhouse gas emissions than a conventional gas-powered car if powered with a coal intensive power mix. However, a pneumatic-combustion hybrid is technologically feasible, inexpensive and could eventually compete with hybrid electric vehicles. Transport Research BoardThe poster on "Hot Deal or Hot Air - Life-cycle Analysis of Pneumatic Cars" was presented at Transport Research Board 2010 (pdf). |
Media coverageNew York Times: Study Says Air Cars Are InefficientEnvironmental Research Web: Compressed-air vehicles fail comparison Wired: Research Deflates Air Cars BNET: Air Cars Have Major Range and Emission Challenges, Says Two New Studies Slashdot: Berkeley Engineers Have Some Bad News About Air Cars The Cost of Energy: Air cars blown away The Truth about Cars: Study Validates Common Sense: Air Cars Are Hot Air UC Berkeley News: Wheels Blog: Study Says Air Cars Are Inefficient Depleted Cranium: No ****, Sherlock: Air Powered Cars are Ineffecient Cars.myloger: Air Cars Have Major Range and Emission Challenges, Says Two New Studies, BNET Auto Blog, BNET Fast Company: Study Says Compressed Air Cars Are a Pipe Dream--Focus on EVs Twitter: Air car Auto Slug: The air car is more polluting than electric cars |
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