A tank contains R134a initially at 3 degrees Celsius with a quality of 0.25. the pressure is held constant by nitrogen gas acting against a flexible bladder as shown. The valve is opened between the tank and a supply line carrying R134a at 975kPa, 118 degrees Celsius. The pressure regulator allows the pressure in the tank to remain constant as the bladder expands. The valve between the line and the tank closed at the instant when it contains 20kg of R134a with a quality of 0.95. if the entropy generation amounts to 1.025 kj/k, determine: Initial mass of r134a in the tank (kg) Heat transferred (kj) Is heat absorbed or released in the process Show mass, energy and entropy balance equations when starting Initial state, state at inlet, final state H1,s1,h2,s2
A tank contains R134a initially at 3 degrees Celsius with a quality of 0.25. the pressure is held constant by nitrogen gas acting against a flexible bladder as shown. The valve is opened between the tank and a supply line carrying R134a at 975kPa, 118 degrees Celsius. The pressure regulator allows the pressure in the tank to remain constant as the bladder expands. The valve between the line and the tank closed at the instant when it contains 20kg of R134a with a quality of 0.95. if the entropy generation amounts to 1.025 kj/k, determine: Initial mass of r134a in the tank (kg) Heat transferred (kj) Is heat absorbed or released in the process Show mass, energy and entropy balance equations when starting Initial state, state at inlet, final state H1,s1,h2,s2
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter3: Refrigeration And Refrigerants
Section: Chapter Questions
Problem 31RQ: Define a near-azeotropic refrigerant blend, and give twoexamples.
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A tank contains R134a initially at 3 degrees Celsius with a quality of 0.25. the pressure is held constant by nitrogen gas acting against a flexible bladder as shown. The valve is opened between the tank and a supply line carrying R134a at 975kPa, 118 degrees Celsius. The pressure regulator allows the pressure in the tank to remain constant as the bladder expands. The valve between the line and the tank closed at the instant when it contains 20kg of R134a with a quality of 0.95. if the entropy generation amounts to 1.025 kj/k, determine:
- Initial mass of r134a in the tank (kg)
- Heat transferred (kj)
- Is heat absorbed or released in the process
- Show mass, energy and entropy balance equations when starting
- Initial state, state at inlet, final state
- H1,s1,h2,s2
Transcribed Image Text:Pressure-regulating
valve
Nitrogen supply
N2
Flexible bladder
Refrigerant 134a
Tank
Line
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