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Name:
EN ES 232 Thermodynamics
Spring 2013 Midterm #1 February 22, 2013
Section 0201: Closed Book
Closed Notes
No formula sheet
Calculator is permitted
Prof. Ray Sedwick
University of Maryland, College Park
Sign below to indicat compliance with the U

ENES 232: Thermodynamics
Homework #2rev
Assigned: 9/5/16
Due: 9/13/16
Question #1 Piston-Cylinder, Work, Polytropic process
Answers (21kJ, 3bar,~11kJ, ~0.9bar , ~9kJ, ~0.6bar)
The gas inside a cylinder is confined by a piston to a volume of 100 liters. An

ENES 232: Thermodynamics
Homework #2
Assigned: 9/9/15
Due: 9/15/15
Question #1 Piston-Cylinder, Work, Polytropic process
The gas inside a cylinder is confined by a piston to a volume of 100 liters. An external force on the piston changes
the volume of gas

ENES 232: Thermodynamics
Homework #6
Assigned: 10/5/2015
Due: 10/13/15
Question #1 Nozzle Flow
A well-insulated diffuser has an inlet area of 2.0 in2 and an outlet area that is 15 times
larger than the inlet. Oxygen enters at a temperature of 440R, a pres

ENES 232: Thermodynamics
Homework #2
Assigned: 2/2/15
Due: 2/10/15
Question #1 Piston-Cylinder, work, polytropic process
The gas inside a cylinder is confined by a piston to a volume of 100 liters. An external force on the piston changes the volume of
the

ENES 232: Thermodynamics
Hines Sections: Homework #3
Assigned: 2/4/13
Due: 2/11/13
Question #1 Energy Balance
A gas is compressed in a piston-cylinder assembly from p1 = 1.5 bar to p2 = 7 bar , V2 = 0.02 m 3 in a
polytropic process for which n = 1.3 . The

ENES 232: Thermodynamics
Hines Sections: Homework #7
Assigned: 3/4/13
Due: 3/11/13
Question #1 Throttling valve + Turbine
A throttling valve is located upstream from a steam turbine, with the steady-state inlet conditions
to the valve given as 500 psi and

ENES 232: Thermodynamics
Homework #4
Assigned: 2/16/15
Due: 2/24/15
Question #1
A piston-cylinder contains oxygen gas that is initially at 77C. The gas expands, resulting in a final
temperature and pressure of 40C and 5 bar. The gas is modeled as ideal w

Thermodynamics
Refrigeration Systems
Dr. Kristen M. Hines
Refrigeration Systems
Chapter 10.1-10.5
Carnot
Carnot vs. reality
Practical Aspects
Variations and Improvements
Carnot Refrigeration Cycle
Carnot reality check
3 Departures
1.
2.
3.
Ideal
Vapor Co

Chapter 1
Getting Started
Introductory Concepts and Definitions
1
Summary
Fundamental concepts
closed system and control volume
boundary and surroundings,
property, state, process
extensive and intensive properties
equilibrium
SI and English Engineering u

Chapter 2
Energy and the
First Law of Thermodynamics
PROBLEMS
Summary
1
FRAMEWORK for SOLVING 1ST LAW PROBLEMS
Decision 1: What type of system do we have?
Tells us the form of our energy equation.
Decision 2: What type of substance do we have?
How to eval

Chapter 2
Energy and the
First Law of Thermodynamics
Summary
Demonstrate understanding of key concepts related to
energy and the first law of thermodynamics. . . including
internal, kinetic, and potential energy, work and power,
heat transfer and heat tr

Chapter 5
The Second Law of
Thermodynamics
1
Learning Outcomes
Demonstrate understanding of key
concepts related to the second law of
thermodynamics, including alternative
statements of the second law, the internally
reversible process, and the Kelvin
tem

Chapter 3
Evaluating Properties
1
Summary
Demonstrate understanding of key concepts . . .
including phase and pure substance, state principle
for simple compressible systems, p-v-T surface,
saturation temperature and saturation pressure, twophase liquid-v

Chapter 1
Getting Started
Introductory Concepts and Definitions
PROBLEMS
1
Problem-Solving Methodology
Known: Read the problem, think about it, and
identify what is known.
Find: State what is to be determined.
Schematic and Given Data: Draw a sketch of
sy

ENES232 Thermo
Write the EES code to solve the following problems
Problem #1
Put answers into
online canvas
quiz.
Problem #2
Print both the
code and results
to submit
Problem #1
Try these to make sure you
are doing it right and put
answers into Canvas

ENME382, HW 3 Solutions
Problems from Callister & Rethwisch
Theseproblemswillnotreceivepoints,butyouwillbecheckedoffforthem.
Problem 3.5
Show that the atomic packing factor for BCC is 0.68.
Solution 3.5
The atomic packing factor is defined as the ratio of

ENME 350: HW25
Due December 12, 2016 by 8:00 AM in class
Fall, 2016
1. Please go to https:/www.CourseEvalUM.umd.edu and complete the evaluation for this course.
After you are done take a screenshot and print out showing your evaluation as being complete.

Problem #1 Regeneration, Open Feedwater Heater, isentropic efficiencies
Water is the working fluid in the cycle below. Superheated vapor enters the turbine at 10MPa
and 480C. The condenser pressure is 6kPa. Steam expands through the first turbine stage to