Feed water heaters are used to preheat water before entering the boiler of a steam power plant by mixing cold water with steam bled from some middle stages of the turbine. The feed water heater shown in the figure is assumed steady-flow. The device is not fully insulated, and 400 kW heat is rejected to the environment at the temperature of 27°C during the process. Calculate the rate of total entropy generation for the system. States at inlets and outlet of the feed water are specified in the figure.
Theory and Design for Mechanical Measurements
Measurement is a term that refers to analyzing a manufactured component regarding the degree of accuracy for dimensions, tolerances, geometric profile, roundness, flatness, smoothness, etc. Measurement always involves comparing the manufactured component or the prototype with a standard specimen whose dimensions and other parameters are assumed to be perfect and do not undergo changes with respect to time.Precisely in mechanical engineering the branch that deals with the application of scientific principles for measurements is known as metrology. The domain of metrology in general deals with various measurements like mechanical, chemical, thermodynamic, physical, and biological measurements. In mechanical engineering, the measurements are limited to mechanical specific such as length, mass, surface profile, flatness, roundness, viscosity, heat transfer, etc.
Basic principles of engineering metrology
Metrology is described as the science of measurement, precision, and accuracy. In other words, it is a method of measurement based on units and predefined standards.
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