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Engineering and Tech / Fundamentals of Engineering Thermodynamics 7 / Chapter 4 / Problem 77P

Fundamentals of Engineering Thermodynamics | 7th Edition | ISBN: 9780470495902 | Authors: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey

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Energy Analysis of Control Volumes at Steady

Chapter 4, Problem 77P

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QUESTION:

Refrigerant 134a enters a heat exchanger at \(-12^{\circ} \mathrm{C}\) and a quality of 42% and exits as saturated vapor at the same temperature with a volumetric flow rate of \(0.85 \mathrm{~m}^3 / \mathrm{min}\). A separate stream of air enters at \(22^{\circ} \mathrm{C}\) with a mass flow rate of \(188 \mathrm{~kg} / \mathrm{min}\) and exits at \(17^{\circ} \mathrm{C}\). Assuming the ideal gas model for air and ignoring kinetic and potential energy effects, determine (a) the mass flow rate of the Refrigerant 134a, in \(\mathrm{kg} / \mathrm{min}\), and (b) the heat transfer between the heat exchanger and its surroundings, in \(\mathrm{kJ} / \mathrm{min\).

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QUESTION:

Refrigerant 134a enters a heat exchanger at \(-12^{\circ} \mathrm{C}\) and a quality of 42% and exits as saturated vapor at the same temperature with a volumetric flow rate of \(0.85 \mathrm{~m}^3 / \mathrm{min}\). A separate stream of air enters at \(22^{\circ} \mathrm{C}\) with a mass flow rate of \(188 \mathrm{~kg} / \mathrm{min}\) and exits at \(17^{\circ} \mathrm{C}\). Assuming the ideal gas model for air and ignoring kinetic and potential energy effects, determine (a) the mass flow rate of the Refrigerant 134a, in \(\mathrm{kg} / \mathrm{min}\), and (b) the heat transfer between the heat exchanger and its surroundings, in \(\mathrm{kJ} / \mathrm{min\).

ANSWER:

Solution 77P

Step 1 of 6

Here our aim is to determine the mass flow rate of the Refrigerant 134-a and then find out the heat transfer between the heat exchanger and its surroundings both in kJ/min.

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