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nature : one based on the first law of thermodynamics, and on the basis for the evaluation of various industrial processes or devices produced in achieving energy conversion and transfer process satisfactory level of the important indicators, symbols η t . The value equal to the device (or process) at the end of the energy conversion and transfer the whole process was as useful energy and energy consumption is the ratio. According to various industrial equipment, thermal efficiency η t expressions are also different : (1) thermal switch for the power plant (such as the steam turbine, combustion engines and gas turbine), η t equal to the entire process of installation in the output of useful work with the volume imported from outside the device to heat ratio; (2) the amount of power consumption was right for power quality and compression pressure will increase its industrial devices (such as compressors, etc.), η t a direct compression depleting refrigerants by the volume and power input devices from outside the ratio of total power consumption ; (3) As for the heat transfer device (such as oil, chemicals commonly used in various heat transfer equipment, etc.), η t achieve equivalent heat transfer process for the quality obtained with the actual calories consumed from outside of the total heat input to the ratio. Thermal efficiency of the concept is based on the first law of thermodynamics of energy conservation theorem on the basis of evaluation criteria, just from the perspective of the amount of energy (from the point of view of quality is 010 efficiency) to reflect the installation of energy conversion and transfer process performance merits level.
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