Temperature mechanical energy efficiency

Figure 5. Mechanical energy efficiency as a function of roll surface temperature for high density polyethylene...

The process illustrates the use of mechanical refrigeration in its high-efficiency temperature range the maximum use of compression energy because of its high efficiency and the use of turboexpansion at a low temperature—its Carnot efficiency is best at low temperatures, especially because it permits large use of the efficient pressure effect. 

In a number of industrial processes it is beneficial to replace combustion air with oxygen-enriched air to increase the temperature and/or enhance the overall energy efficiency. Since atmospheric N2 is also a source of nitrogen oxides through the thermal NO mechanism,... 

A thermometer is based on a reversible heat engine, which operates between a boiling water bath and a heat reservoir at a lower temperature. The boiling water bath is defined to be at 373°. The temperature of the low temperature bath is determined from the efficiency with which the engine converts heat withdrawn from the boiling water bath to mechanical energy. Derive an explicit equation, Tc = /(e), from which the temperature of the low-temperature bath can be calculated. 

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