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ENGG 3260 (5)

# Basic Problem_Properties_pure_substance.pdf

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School
University of Guelph
Department
Engineering
Course
ENGG 3260
Professor
Linda Gerber
Semester
Winter

Description
Properties of pure substance Problem 1: A rigid container contains saturated liquid water at 200 kPa. Find water temperature and internal energy. Show the state in a T-v diagram. Water is saturated liquid inside T Constant pressure line (P=200 kPa) the container. Therefore, it must be on the saturated liquid line as (°C) shown in the T-v diagram by a * circular symbol ( ). Tsat20.21 Constant temperature line (T=120.21°C) 3 v (m /kg) From Table A-5: Temperature: T = T sat120.21 °C Internal energy: u = u f 504.50 kJ/kg 1 Problem 2: A rigid container contains saturated vapor of water at 125 kPa. Find water temperature and internal energy. Show the state in a T-v diagram. Water is saturated liquid inside Constant pressure line (P=125 kPa) the container. Therefore, it must T be on the saturated liquid line as (°C) shown in the T-v diagram by a * circular symbol ( ). Tsat05.97 Constant temperature line (T=105.97°C) 3 v (m /kg) From Table A-5: Temperature: T = T sat105.97 °C Internal energy: u = u g 2513.0 kJ/kg 2 Problem 3: A rigid container contains water vapor at 1 MPa and 300 °C. Find internal energy of the water vapor. Show the state in a T-v diagram. Water is a vapor (unknown phase) inside the container. First identify T P =1.0 MPa the saturation temperature at (°C) given pressure (1 MPa) from * Table A5 which is 173.88 °C. Draw pressure and saturation T=300 temperature lines in the T-v diagram. Now the given T =179.88 temperature is 300°C. Draw the sat 300°C temperature line (see Figure). Now the intersection point of the 1 MPa pressure line and the 300°C temperature line will give you current state and 3 you will see this is superheated v (m /kg) water vapor. From superheated water table (TABLE A6), internal energy, u=2793.7 kJ/kg 3 Problem 4: A rigid container contains unknown phase of water at 175 kPa. Internal energy of the water in that container is measured as 2000kJ/kg. Find the phase, water temperature, and enthalpy. Show the state in a T-v diagram. Draw the constant pressure line and identify corresponding saturation T (°C) 175 kPa temperature from TABLE A-5 and
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