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Chapter 4 EFFICIENCY OF ENERGY CONVERSION

Chapter 4 EFFICIENCY OF ENERGY CONVERSIONThe National ENERGY Strategy reflects a National commitment to greater EFFICIENCY in everyelement of ENERGY production and use. Greater ENERGY EFFICIENCY can reduce ENERGY costs toconsumers, enhance environmental quality, maintain and enhance our standard of living,increase our freedom and ENERGY security, and promote a strong economy.(National ENERGY Strategy, Executive Summary, 1991/1992)Increased ENERGY EFFICIENCY has provided the Nation with significant economic,environmental, and security benefits over the past 20 years.

The function of a gas furnace is to convert the chemical energy of the gas into heat (thermal energy), as shown in Table 4-1 and illustrated in Figure 4-3. Therefore, we have: Useful energy output = [Energy input] [Efficiency] = [1000 BTU (chemical energy)] [75ÊBTUÊ(thermalÊenergy) Ê100ÊBTUÊ(chemicalÊenergy)Ê] = 750 BTU (thermal energy)

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