22-1
Geothermal based electrical power production is one alternative energy source that is attracting
some attention. Cool water is pumped into the ground (several kilometers deep) where it is
heated by geothermal energy and then returned to the surface.
27-1
The Diesel cycle is usually considered to be a more efficient power plant than the spark-ignition
engine. The purpose of this problem is to compare the Otto and Diesel cycles as a function of
compression ratio. The processes occurring in a spark-igni
25-1
The supercritical carbon dioxide gas turbine cycle that you analyzed in Problem Set #24 has been
modified to use a regenerator, as shown in the figure. Neglect pressure losses in the heat
exchangers. Note that the specific heat of carbon dioxide is a
Problem 17-1
The figure illustrates a "vortex tube".
inlet
T1 = 305 K
P1 = 650 kPa
hot end
T2 = 325 K
P2 = 100 kPa
cold end
f = 0.25
P3 = 100 kPa
vortex tube
.
According to the company that makes the vortex tube, the device takes in high pressure air at
p
14-1
Equations
Problem 14-1 ME 361
$UnitSystem SI kPa K kg
$TabStops 0.2 4 in
known information
Pstm
kPa
= 11.2 [bar] 100
bar
Pressure in the separator
TH = Tsat (Steam, P = Pstm )
steam temperature in the separator
TL = ConvertTemp(C, K, 32 [C])
xin =
Problem 12-1
A horizontal piston-cylinder device encloses an ideal gas that has an initial state of 10 bar and 0.25
m3. The external force opposing the motion of the piston is reduced very slowly so that the gas
expands reversibly (i.e., without friction)
241
Supercritical carbon dioxide gas turbine cycles have been receiving a lot of attention as a
possible replacement for the Rankine cycle in both nuclear and solarpower cycles. This
problemwillanalyzetheperformanceofasupercriticalcarbondioxidecycleinaman
26-1
A four cylinder four-stroke internal combustion engine has a bore of 3.5 in and a stroke of 3.5 in.
The compression ratio of this engine is 8.4. The engine is designed to operate with an air-fuel
ratio of 17 with a fuel that has an energy content of
23-1
This problem will provide a more detailed analysis of the Rankine cycle for geothermal
heat sources considered in problem Set 22. The cycle will be modified to include one
open feedwater heater, as shown in Figure 8-18(a) of the textbook. The cycle i
27-1
The Diesel cycle is usually considered to be a more efficient power plant than the spark-ignition
engine. The purpose of this problem is to compare the Otto and Diesel cycles as a function of
compression ratio. The processes occurring in a spark-igni
28-1
A 3-ton single-stage vapor compression air-conditioning system is being developed. The design
condensing temperature is 105F and the evaporator temperature is 35F. Refrigerants R134a,
R22, ammonia, isobutane, R410A and R1233zd(E) are under considerat
Problem30
Many homes rely on electric water heaters. Consider a typical situation in which water is
availableat10Candheatedto55Cina300litertank.Thetankisequippedwithtwo4500W
heaters. Thetankiswellinsulatedsoheatlossescanbeconsideredtobenegligible. Please
Problem 4-1
A pressure cylinder having a volume of 2.5 liters constants m1 = 2.0 kg refrigerant R134a at T1 =
-20C (state 1).
a.) Sketch a T-v diagram and locate the state of the R134a on your sketch. The sketch can be
approximate, but it should clearly s
23-1
This problem will provide a more detailed analysis of the Rankine cycle for geothermal
heat sources considered in problem Set 22. The cycle will be modified to include one
open feedwater heater, as shown in Figure 8-18(a) of the textbook. The cycle i
Problem 16-1
A well-insulated piston-cylinder device is shown in the figure
gas
mg = 1 kg
cV = 620 J/kg-K
R = 410 J/kg-K
T1 = 295 K
P1 = 200 kPa
block
mb = 2 kg
cb = 390 J/kg-K
Figure 6.A-13: Piston-cylinder device with a block of metal.
The piston-cylind
2-2
The barometer shown in the figure contains mercury which has a density of 13.59 g/cm3. The local
atmospheric pressure is 100.4 kPa.
a) Determine the height L of the mercury in inches and millimeters.
b) Determine the height L if a water-based fluid is
3-1
Tabular engineering data are often needed in solving problems. In most cases, the required data
do not coincide exactly with the values provided in the table so linear interpolation between
adjacent table entries becomes necessary. Using the property
10-1
Steam enters a turbine at m 1 = 600 lbm/hr, P1 = 500 psia, and T1 = 700F with negligible
velocity. Two exit streams leave the turbine, as indicated in the figure. Stream 2 exits at P2 =
200 psia, T2 = 400F with a flow rate of m 2 = 200 lbm/hr and a v
24-1
Supercritical carbon dioxide gas turbine cycles have been receiving a lot of attention as a
possible replacement for the Rankine cycle in both nuclear and solar-power cycles. This
problem will analyze the performance of a supercritical carbon dioxide
9-1
Equations
Problem 9-1
$TabStops
0.2 3 in
Refrigerant 134a flows at steady state through a long pipe that has an inside diameter of 2.5 cm. The R134a enters as
saturated vapor at -8 C with a mass flow rate of 17 kg/min. Refrigerant vapor exits at a pre
9-2
A steam turbine is used to drive an R134a compressor and a generator at steady conditions, as
shown in the figure. The steam enters the turbine at P1 = 4MPa, T1 = 350C, m stm 0.125 kg/s and
exits at P2 = 20 kPa with a quality x2 = 0.95. The R134a ente
28-1
A 3-ton single-stage vapor compression air-conditioning system is being developed. The design
condensing temperature is 105F and the evaporator temperature is 35F. Refrigerants R134a,
R22, ammonia, isobutane, R410A and R1233zd(E) are under considerat
35-1
A cooling tower is shown in the figure with its operating conditions indicated.
air
4
water from condenser
Vw 6000 gal/hr
Tw ,in 95F
1
3
water to condenser
2
5
air
Tamb 74F
amb 0.5
Va 10,000 cfm
makeup water
Tmuw = 80F
This cooling tower is designed
Problem 14-2
Before introducing the temperature scale now known as the Kelvin scale, Kelvin suggested a
logarithmic scale in which the QH/QL = exp(H)/ exp(L) where H and L denote, respectively,
the temperatures of the hot and cold reservoirs on this scale
16-2
Equations
Problem 16-2
$UnitSystem SI K kPa kJ
m = 0.76 [kg]
mass of air
(1)
T1 = ConvertTemp(C, K, 25 [C])
initial temperature
(2)
T2 = ConvertTemp(C, K, 274 [C])
final temperature
(3)
P1 = 101.3 [kPa]
P2 = 358 [kPa]
R=
R#
MW (Air)
initial pressure
Problem Set 1
Problem 2 (use EES)
Shown in the figure below is a spring-loaded valve. When the valve is seated as shown, the spring
is compressed 0.01 m and it pushes down on a disk having a 1 cm diameter. The disk has a mass of
34 grams. One side of the
29-1
You are considering installation of the conventional vapor compression refrigeration system
shown in the figur. The system must provide cooling to a space at TC = -10F and reject heat to
ambient air at TH = 85F.
Qcond
TH
4
compressor
3
expansion valv
File:I:\WIN\Desktop\ME361 - Thermo\S16\HW Statements\s16\set2\2.EES
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EES Ver. 9.935: #100: For use only by Students and Faculty, College of Engineering University of Wisconsin - Madison
$Keyboard US
$UnitSystem SI C Pa J mass