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A small, flexible bag contains 0.1 kg of ammonia at ?10°C
Chapter 3, Problem 236HP(choose chapter or problem)
Problem 236HP
A small, flexible bag contains 0.1 kg of ammonia at −10°C and 300 kPa. The bag material is such that the pressure inside varies linearly with the volume. The bag is left in the sun with an incident radiation of 75W, losing energy with an average 25Wto the ambient ground and air. After a while the bag is heated to 30°C, at which time the pressure is 1000 kPa. Find the work and heat transfer in the process and the elapsed time.
Questions & Answers
QUESTION:
Problem 236HP
A small, flexible bag contains 0.1 kg of ammonia at −10°C and 300 kPa. The bag material is such that the pressure inside varies linearly with the volume. The bag is left in the sun with an incident radiation of 75W, losing energy with an average 25Wto the ambient ground and air. After a while the bag is heated to 30°C, at which time the pressure is 1000 kPa. Find the work and heat transfer in the process and the elapsed time.
ANSWER:
Solution 236HP
Step 1 of 7:
A bag contains ammonia left in the Sun with incident radiation and loses energy. We are going to find the work and the heat transfer and the elapsed time.
The mass of ammonia m = 0.1 kg
The initial temperature T1 = -10°C
The initial pressure P1 = 300 kPa
The incident radiation in = 75 W
The energy lost out = 25 W
The final temperature T2 = 30°C
The final pressure P2 = 1000 kPa