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A piston/cylinder arrangement contains 0.1 kg R-410a of
Chapter 3, Problem 237HP(choose chapter or problem)
Problem 237HP
A piston/cylinder arrangement contains 0.1 kg R-410a of quality x = 0.2534 at −20°C. Stops are mounted so that Vstop = 3V1; see Fig. P3.237. The system is now heated to the final temperature of 20°C. Find the work and heat transfer in the process and draw the P–v diagram.
FIGURE P3.237
Questions & Answers
QUESTION:
Problem 237HP
A piston/cylinder arrangement contains 0.1 kg R-410a of quality x = 0.2534 at −20°C. Stops are mounted so that Vstop = 3V1; see Fig. P3.237. The system is now heated to the final temperature of 20°C. Find the work and heat transfer in the process and draw the P–v diagram.
FIGURE P3.237
ANSWER:
Solution 237HP
Step 1 of 7:
A cylinder contains refrigerant R-410a with the initial quality at the given temperature. We need to find the heat transfer and the work in the process. We need to draw the P-v diagram too.
The mass of R-410a m =0.1 kg
The quality x = 0.2534
The initial temperature T1 = -20°C = 253 K
The volume (specific) at the stops Vstop = 3V1 or vstop = 3v1
The final temperature T2 = 20°C = 293 K
The gas constant R = 0.11455 kJ/kg.K (A.5)