Your cars air conditioning system is \"charged\" by adding R-134from a pressuriz

Question

Your cars air conditioning system is "charged" by adding R-134from a pressurized tank into the piping of your air conditioning system. Assume that your car AC is being charged from a tank that contains 8 kg of R-134 at 30 C with a quality of 0.05. The valve on the R-134 tank is opened allowing LIQUID R-134 to flow from the tank into the car AC system until there is only 4.25 kg of R-134 remaining in the tank. Assuming that the filling process is isothermal: Write the simplified ENERGY balance for this unsteady process. Explain all terms and list all simplifying assumptions. Start from the general Energy Balance of Eq?n 5-45 in the textbook Write the simplified MASS balance starting from Eq?n 5-43 Determine the final quality of the R-134 in the tank. Determine the total heat transferred during the process (was it TO or FROM the R-134 tank?)

Explanation / Answer

The look at the energy content of the steam in and out of the turbine and the energy content in and out of the fluid being compressed. To do a complete balance, you would need to also allow for any energy losses to cooling systems for lube oil and bearings.

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