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A 20-ft3 tank contains ammonia at 20 lbf/in.2, 80 F. The
Chapter 4, Problem 209EUP(choose chapter or problem)
Problem 209EUP
A 20-ft3 tank contains ammonia at 20 lbf/in.2, 80 F. The tank is attached to a line flowing ammonia at 180 lbf/in.2, 140 F. The valve is opened, and mass flows in until the tank is half full of liquid, by volume at 80 F. Calculate the heat transferred from the tank during this process.
Questions & Answers
QUESTION:
Problem 209EUP
A 20-ft3 tank contains ammonia at 20 lbf/in.2, 80 F. The tank is attached to a line flowing ammonia at 180 lbf/in.2, 140 F. The valve is opened, and mass flows in until the tank is half full of liquid, by volume at 80 F. Calculate the heat transferred from the tank during this process.
ANSWER:
Solution 209EUP
Step 1 of 4:
A tank contains ammonia gas at the given condition is connected to a line flowing ammonia at the different condition. The tank is half by liquid ammonia from the line at a constant temperature. We are going to find the heat transfer in this process.
At tank:
The initial pressure of ammonia P1 = 20 lbf/in2 = 20 psia
The initial volume V1 = 20 ft3
The initial temperature T1 = 80 F = 540 R
At line:
The temperature T2 = 140 F = 600 R
The pressure P2 = 180 lbf/in2 = 180 psia
The final temperature at the tank T = 80 F (constant)
The specific heat of ammonia Cv0 = 0.392 Btu/lbm.R (F.4)