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When determining the enthalpy of a fluid, engineers do not measure this quantity directly (i.e. you...

When determining the enthalpy of a fluid, engineers do not measure this quantity directly (i.e. you cannot buy an enthalpy meter online). Instead, two independent properties are measured, and enthalpy is determined based on previously developed Equations of State, or data tables. In other words, h=f(P,T) Consider the following scenario: an engineer calculates the enthalpy of a superheated refrigerant vapor (R134a) by measuring the pressure and temperature of the fluid. The uncertainty of the pressure and temperature sensor is known. Provide the equation you would use to determine the uncertainty in enthalpy. Assume that the measured pressure is 500 kPa±10 kPa, and the temperature is 30 °C±0.5 °C. Using the tables from your Thermodynamic textbook, determine the enthalpy of the fluid in kJ/kg. Again using the tables from your Thermodynamic textbook, determine the uncertainty in the calculated enthalpy. Discuss any assumptions or approximations that you make.

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