7.18/A typical refrigeration (vapor-compression) cycle uses refrigerant 134a operating between the evaporator at a temperature of -5°C and the condenser at a temperature of 35°C. During your research you found an interesting substance that appears to have better properties than refrigerant 134a. You have measured its vapor pressure and enthalpy of vaporization to be 0.6 bar and 35 kl/mol at T= -5°C, and 4.2 bar and 30 kJ/mol at T = 35°C. For simplicity, consider the gas to behave like an %3D ideal gas. Your best estimate for a constant ideal gas heat capacity is of Cp = 110 J/mol K. The
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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