Chapter three

Determining Energy Usage

Abstract

The cost of fuel per unit energy establishes a means to evaluate a direct comparison of conventional fuel costs versus solar energy costs. Fuel conversion equivalencies are provided in a tabular format, and sample energy equivalency examples are calculated for hardwood and wood pellets versus fuel oil and fuel oil versus electricity. Energy output is noted to be different for oil, propane, and natural gas depending upon efficiencies, usage, and cost per British Thermal Unit. Principles of heat energy are addressed relative to heating domestic water using basic mathematical relationships. Terms regarding temperature and heat are explained including examples illustrating their difference. The concept ...

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