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Posts tagged “thermodynamics”

By Robert Rapier on Aug 9, 2009 with no responses

Answering Reader Questions 2009: Part 4

This marks the final installment of answers to questions recently submitted by readers. This final installment covers the impact of E10 on fuel efficiency, my general optimism (or lack thereof), algal fuel, thermodynamics and energy limitations, Accoya, and litigation. Once again, thanks to the readers who submitted questions, and thanks to those who helped answer them. Without the help I received, this might have been a 10-part series. Here are the links to the previous installments: Part 1 – Covered plasma gasification, natural gas projections, free energy, promising alternative energy technologies, and GTL Part 2 – Covered coal-to-liquids, technology hype, green gasoline, refining improvements, allocation of money toward renewables, electricity consumption, the Automotive X Prize, Big Oil, cellulosic ethanol, and… Continue»

By Robert Rapier on Jul 9, 2009 with no responses

Technical Feasibility is the Easy Part

A couple of people have now written to ask for comments on the story from Green Car Congress about the Polish CO2 to methanol scheme. Here is the story:Report: Polish Power Plant and University to Cooperate on CO2 to Methanol Trial Here is the bit I immediately focused on: Nazimek says his “artificial photosynthesis” process is based on the photocatalytic conversion of water and carbon dioxide under deep ultraviolet light. Synthesis of 1 kmole (32 kg) of CH3OH from CO2 and H2O requires 586MJ of energy, according to Nazimek’s calculations. (Methanol has a HHV of 22.7 MJ/kg, or 726 MJ/kmole). So the implication there is that you are getting more energy in the form of methanol than you put into… Continue»