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meeklobraca
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Homework Statement
A piston cylinder device with a spring attached initially contains 0.02m^3 of R-134A at 50C. A valve connected to the cylinder is opened and 20kg of R-134A enters the device from a supply line at 800kPa and 80C. The spring is compressed and the piston moves up. The process stops when the pressure inside the cylinder reaches 1MPa, at a temperature of 100C and a volume of 0.6m^3.
a) The quality (x) of the R-134A in state 1?
b) Work done in this process (kJ)?
c) Amount of heat transferred to/from device (kJ)?
Homework Equations
The Attempt at a Solution
Im stuck at the quality aspect of the question. In most piston cylinder devices the volume is constant at least for a little but I think the volume is constantly changing throughout the problem. So I don't know how to get the quality with the information given.
Any help would be appreciated!