Combined heating, cooling & power handbook : technologies & by Neil Petchers

By Neil Petchers

A how-to consultant for utilizing power and environmental potency as a method to be within your means and ecocnomic, this ebook comprises photos of kit from quite a lot of brands, cutaway drawings, format schematics, functionality curves, facts tables, functionality checks in line with brands' facts, and contributions from numerous self sustaining engineering assets. it's divided into 4 major elements: concept and know-how; working surroundings; functions; and research and implementation. the writer develops an built-in method of strength and cost-efficiency undertaking improvement, matching energy construction and heating/cooling specifications to supply stable monetary returns.

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Depending on the available load or rejected energy sink of displaceable thermal energy, it is often better to consider a more thermally efficient power producing system with less heat recovery. With an unlimited sink of thermal energy requirement, power generating thermal efficiency becomes less of a consideration. A relatively inefficient power system may be considered because decreased capital costs and increased thermal energy generation efficiency compensate for decreased power output. However, if there is a limited amount of thermal energy that can be used, the emphasis shifts to more thermally efficient prime movers that produce a higher percentage of shaft power and a lower percentage of recoverable thermal energy.

3-12 Fuel-Chargeable-to-Power Comparison of Three Cogeneration Cycles. Source: Cogen Designs, Inc. EMISSIONS COMPARISON VS. NO COGENERATION OF COGENERATION APPLICATION OF COGENERATION CYCLES ONSITE VS. PURCHASED ELECTRICITY Paramount to the concept of controlling pollution, and air emissions in particular, is the understanding that, The benefits of avoided transmission and distribution losses associated with electricity purchased from a centralized 34 Copyright © 2003 by The Fairmont Press. Localized Versus Central Station Power Generation g/kWh 1300 processes, the cogeneration cycle efficiency benefits may shift the life-cycle cost advantage away from the purchased electricity option.

These advantages are due largely to a higher utilization of input energy when compared with a central electric generation plant. Potential advantages include recovery of high-grade heat (as opposed to rejection of low-grade heat by central electric generation plants) and reduction of electrical transmission and end-use device inefficiencies. Economics do not always come out in favor of a more efficient end-use. Large centralized power plants also possess several advantages over the smaller user, including economy of scale, preferential fuel cost, relatively low staffing levels, and reserve capacity.

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