CHEG 2313
Thermo I HW#3
Spring 2011
Due Wednesday, February 9, 2011 in class. 1. In snowy weather, the driver of a car going 30 mph slides down a 200 ft hill and then up a 225 ft. hill. Assuming that the driver never puts his foot on the gas or brake peda
Name: _ CHEG 2313 Short Answer: 1. Which thermodynamic property is the best measure of the molecular activity of a substance: (2 pt) a. enthalpy b. internal energy c. external energy d. none of the above 2. Energy is added in the amount of 50 kJ in a heat
CHEG 2313
Thermo I HW#6
Spring 2011
Due Wednesday, March 9, 2011 by 5pm. 1. A process produces power by expanding 1.3 kg/s of steam from 500C and 3.5 MPa to 250C and 3000 kPa. A breakdown in insulation around the process allows a heat loss of 30 kJ per kg
Example 3.1 A 0.5 kg rock is getting ready to fall over a cliff that is 100m in height. Determine the potential energy of the rock.
Example 3.2 A 0.5 kg rock falls over a 100 m cliff. Just before rock strikes the water at the m base of the cliff, its cent
Name: _ CHEG 2313 Short Answer: 1. There are two masses of the same solid, incompressible material with a constant specific heat. Mass A is 2 kg with Temperature A of 200C. Mass B is 1 kg with Temperature B of 400C. If both masses are cooled to 0C, which
Name: _ CHEG 2313 Short Answer: 1. True or False: Entropy is a measure of randomness or disorder. (2 pt) 2. True or False: When a thermodynamic system has undergone a cyclic process, the system and the surroundings must have returned to their initial stat
Name: _ CHEG 2313 Thermo I Exam 2 Takehome Spring 2011
This is an opportunity to earn an additional 25/25 points for Thermo I Exam 2. The attached problem is due by the beginning of class Friday, March 18th. I certify that the work on the attached pages i
Name: _ CHEG 2313 Thermo I Exam III Spring 2010
1. What is meant by the term thermodynamic state variable? Give three examples. (5 pts) 2. The diagram below represents two different processes [A] and [B]. Based on the diagram below select the most appropr
Thermodynamics I Exam 2 Equation Sheet Entropy equation:
K . . Rate of change: dS = M k S k + Q + S gen dt k =1 T .
Q Integrated: S 2 S1 = k M k S k dt + dt + S gen T t1 t1
.
t2
t2
.
Special Cases (ideal gas, constant heat capacities): T V S 2 S 1 = CVIG
Thermodynamics I Exam 3 Equation Sheet Efficiency: Heat engine: =
W QH
Carnot heat engine: =
W TH TC = QH TH
WActual WRe versible WRe versible Fluid flow engine with work done on the system: = WActual Fluid flow engine with work done by the system: =
1. (30 pts) Two real engines are operating as a cycle in series as shown below. Engine #1 takes in 1200 W of heat rejects 750 W of heat to Engine #2 at 300C. Engine #2 operates at an efficiency equal to 60% of the Carnot efficiency and has an outlet tempe
CHEG 2313
Thermo I HW#9
Spring 2011
Due Wednesday, April 13, 2011 in class. 1. A power plant using an ideal Rankine power generation cycle operates a boiler at a pressure of 500 bar with an outlet temperature of 800C. The condenser produces saturated liqu
CHEG 2313
Thermo I HW#9
Spring 2011
Due Wednesday, April 13, 2011 in class. 1. A power plant using an ideal Rankine power generation cycle operates a boiler at a pressure of 500 bar with an outlet temperature of 800C. The condenser produces saturated liqu
Name: _ CHEG 2313 Short answer: 1. Determine the derivative of the following using the chain rule of differentiation: A(V,S,N) (6 pts) V 2. Write out the triple product rule for the following: S (6 pts) H Thermo I Exam II Fall 2010
3. For each of the foll
Name: _ CHEG 2313 Thermo I Exam I Example 2
1. A gas is contained in a sealed, frictionless, pistoncylinder arrangement, where the piston mass and the atmospheric pressure above the piston remain constant. The gas is heated and expands in the cylinder. I

sometimes molar form of energy balance more convenient . . 2 K . 2 d H + m + gh + Q + W U + Nm + gh = N k 2 2 dt k =1 k H = molar enthalpy m = molecular weight


can often simplify energy balance by assuming changes in potential and kinetic energy < c
True/False Quiz
02/16/2011
Lab I Drill
1. Memorandum type reports are primarily used for internal communication within a company. (T) 2. Wrap around safety eyewear is acceptable. (T) 3. Neatness counts in recording lab notebook data. (T) 4. Memorandum rep
Ch. 1 equations Force: F = ma Pressure: P = F A Pabs = Pgauge + Patm Mw + M p Ap g T ( F ) + 459.67 1.8
Gauge pressure: Pg =
Temperature: conversions T ( R ) = T ( F ) + 459.67 Ideal gas law: PV = nRT Ch. 2 equations Mass balances: K . dM =Mk dt k =1 M (t
Ch. 4 equation sheet Entropy equation:
K . . Rate of change: dS = M k S k + Q + S gen dt k =1 T .
Q Integrated: S 2 S1 = k M k S k dt + dt + S gen T t1 t1
.
t2
t2
.
Special Cases (ideal gas, constant heat capacities): T V S 2 S 1 = CVIG ln 2 + R ln 2 T V
Ch. 3 equations Spring (Hookes law):
F = kx
EP =
12 kx 2
Work: Electrical shaft work: WS = EI Expansion / compression work: W = PdV Energy Balance: Rate of change: . . 2 K . 2 d + gh = M k H + + gh + Q + W U + M dt 2 2 k =1 k
. . 2 K . 2 d + gh = N k H +
Thermodynamics I Exam 1 Equation Sheet Definitions:
H = U + PV
For Ideal Gases: PV = nRT Pressure Gauge: Mw + M p Pg = g A Spring (Hookes law): F = kx Work: Electrical shaft work: WS = EI Expansion / compression work: W = P
.
EP =
12 kx 2
dV dt
Mass balan
Thermodynamics I Exam 2 Equation Sheet Entropy equation:
K . . Rate of change: dS = M k S k + Q + S gen dt k =1 T .
Q Integrated: S 2 S1 = k M k S k dt + dt + S gen T t1 t1
.
t2
t2
.
Special Cases (ideal gas, constant heat capacities): T V S 2 S 1 = CVIG
CHEG 2313
Thermo I HW#1
Spring 2011
Due Wednesday, January 26 at beginning of class. Unit conversions: 1. Convert 1 tablespoons mL to . (2 pts) sennight hr N to bar . (2 pts) cm 2
2. Convert 5
3. Which is faster: 60 miles per hour or 60 meters per second?
CHEG 2313
Thermo I HW#2
Spring 2011
Due Wednesday, February 4 at beginning of class. 1. A 100,000 kg holding tank is being used to collect excess solvents that are then send on to a distillation tower to be separated. Toluene flows in at a steady rate of
CHEG 2313
Thermo I HW#3
Spring 2011
Due Wednesday, February 9, 2011 in class. 1. In snowy weather, the driver of a car going 30 mph slides down a 200 ft hill and then up a 225 ft. hill. Assuming that the driver never puts his foot on the gas or brake peda
CHEG 2313
Thermo I HW#4
Spring 2011
Due Wednesday, February 23, 2011 in class.
2 1. In class, we discussed that generally M k H k > M k + gh because the enthalpy 2 k change is often more sizeable than the height and velocity changes of the fluid. Compare
CHEG 2313
Thermo I HW#5
Spring 2011
Due Wednesday, March 2, 2011 in class. 1. Water is to be heated from a pipeline temperature of 15C to 85C using superheated steam at 550C and 3 MPa in a steadystate process to produce 15 kg/s of heated water. The heati
CHEG 2313
Thermo I HW#6
Spring 2011
Due Wednesday, March 9, 2011 by 5pm. 1. A process produces power by expanding 1.3 kg/s of steam from 500C and 3.5 MPa to 250C and 3000 kPa. A breakdown in insulation around the process allows a heat loss of 30 kJ per kg
CHEG 2313
Thermo I HW#7
Spring 2011
Due Wednesday, March 30, 2011 in class. 1. A cyclical engine receives 550 kJ of heat from a reservoir at 800 K, delivers 225 kJ of work, and rejects 325 kJ of heat to a reservoir at 175 K. Does this engine violate the e
CHEG 2313
Thermo I HW#8
Spring 2011
Due Wednesday, April 6, 2011 in class. 1. One mole of an ideal gas at initial conditions T1 = 148C and V1 = 1 m3 undergoes an expansion to 2 kPa and 2 m3, followed by isothermal expansion to 1 kPa, followed a compressio