10th Edition

ISBN: 9781119634928

Author: Borgnakke

Publisher: WILEY

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Chapter 5, Problem 5.59P

A heat pump receives energy from a source at 80°C and delivers energy to a boiler that operates at 350kPa. The boiler input is saturated liquid water and the exit is saturated vapor, both at 350kPa. The heat pump is driven by a 2.5−MW motor and has a COP that is 60% that of a Carnot heat pump. What is the maximum mass−flow rate of water the system can deliver?

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Chapter 5, Problem 5.58P

Chapter 5, Problem 5.60P

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I need help answering parts a and b

Required information Water initially at 200 kPa and 300°C is contained in a piston-cylinder device fitted with stops. The water is allowed to cool at constant pressure until it exists as a saturated vapor and the piston rests on the stops. Then the water continues to cool until the pressure is 100 kPa. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Water 200 kPa 300°C On the T-V diagram, sketch, with respect to the saturation lines, the process curves passing through the initial, intermediate, and final states of the water. Label the T, P, and V values for end states on the process curves. Please upload your response/solution by using the controls provided below.

A piston-cylinder device contains 0.87 kg of refrigerant-134a at -10°C. The piston that is free to move has a mass of 12 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 15°C. Use data from the tables. R-134a -10°C Determine the change in the volume of the cylinder of the refrigerant-134a if the specific volume and enthalpy of R-134a at the initial state of 90.4 kPa and -10°C and at the final state of 90.4 kPa and 15°C are as follows: = 0.2418 m³/kg, h₁ = 247.77 kJ/kg 3 v2 = 0.2670 m³/kg, and h₂ = 268.18 kJ/kg The change in the volume of the cylinder is m

Chapter 5 Solutions

FUNDAMENTALS OF THERMODYNAMICS

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