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Politics : Rat's Nest - Chronicles of Collapse -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (8461)	8/20/2008 1:16:47 PM
From: Wharf Rat	Read Replies (1) \| Respond to of 24246

Should EROEI be the most important criterion our society uses to decide how it meets its energy needs? Posted by Chris Vernon on August 20, 2008 - 10:07am in The Oil Drum: Europe This is a guest post by Adam Dadeby (Adam1). Adam is currently studying towards an MSc in Renewable Energy and the Built Environment with the Centre for Alternative Technology in Wales, UK. What is EROEI? Energy returned on energy invested (EROEI or EROI) is a concept that mirrors the financial metric, return on investment (ROI). In order to make an energy gain or “profit”, energy or work must be consumed or exerted (Cleveland, C.J., 2001, p.11). The energy gain or profit often referred to as “net energy”. EROEI is usually expressed as a ratio, or occasionally as a percentage. EROEI can also be represented diagrammatically in simplified form (Fig. 1). Figure 1: EROEI (Charles Hall, Pradeep Tharakan, John Hallock, Wei Wu and Jae-Young Ko, Advances in Energy Studies Conference, Porto Venere, Italy, September 2002)2 The energy referred to in EROEI can be energy to run technology, such as liquid fuels for transport or electricity for lighting. It can however refer to energy in a form that can be taken in directly by living organisms: food. There's more… (2618 words) europe.theoildrum.com