EBK NUMERICAL METHODS FOR ENGINEERS
7th Edition
ISBN: 9780100254145
Author: Chapra
Publisher: YUZU
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Textbook Question
Chapter 20, Problem 50P
Repeat Prob. 20.49 but fit a power curve to all the data in Table P20.49. Comment on your results.
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Project 1
100 150 200 250
20.
300
350
400
450
500
550
600
650
QIPINHFC-134a
700
200.
000124
-0.0014
0.0016
10.
Pressure-Enthalpy
0,0011
P00018
0.0020
8.
0.0013
0.0030
Diagram
100.
80.
6.
volume - 0.0040 mikg
(SI Units)
0.0060
60.
0.0080
0.010
40.
2.
0.015
0 020
20.
1.
0 030
0.8
0.040
0.6
10.
0.060
8.
0.4
0.080
temper
0.10
4.
a 02
0.15
0.20
2.
0.1
0.08
030
0.40
0.06
1.
0.8
0.60
0.04
0.6
O.80
1.0
0.4
0.02
15
20
0.2
0.01
100
150
200 250
300 350
400
450
0.1
700
500 550
600
650
Enthalpy (kJ/kg)
Refrigerant HFC-134a as the working fluid
Ideal cycle operation condition is assumed
Cycle is operated at high pressure line of 0.8 MPa
Cycle is operated at low temperature line of –10° C
- Flow rate is 0.1 kg/sec
The head of the department in the company that you are working in asked you to make use of pressure -
enthalpy chart provided for HFC-134a refrigerant
a. Estimate the reversible COP values, if the low and high medium temperature are as for
the evaporator and condenser.
Pressure (bar)…
Project 1
100
20.
150
200
250
300
350
400
450
500
550
600
650
QUPINHFC-134a
700
200.
00012
00013
0.0014
r0.0016
J00018
10.
Pressure-Enthalpy
0.0020
8.
0.0030
100.
80.
6.
Diagram
volume 0.0040 mikg
(SI Units)
0.0060
0 0080
0.010
4.
60.
40.
2.
0.015
0 020
20.
1.
0.8
0030
0.040
10.
8.
0.6
0.060
0.4
6.
0.080
010
0.2
0.15
020
2.
0.1
0.30
0.08
0.40
1.
0.8
0.06
060
0.04
0.6
O80
1.0
0.4
0.02
15
20
0.2
0.01
100
150
200
250 300
350 400
450
0.1
700
500
550
600
650
Enthalpy (kJ/kg)
Refrigerant HFC-134a as the working fluid
Ideal cycle operation condition is assumed
- Cycle is operated at high pressure line of 0.8 MPa
- Cycle is operated at low temperature line of – 10° C
- Flow rate is 0.1 kg/sec
The head of the department in the company that you are working in asked you to make use of pressure -enthalpy
chart provided for HFC-134a refrigerant
Task.1
1. Determine the Refrigeration effect (RE), heat of compression (HOC), and heat of rejection (HOR) and
their corresponding rate/power values in kW.…
Read the questions carefully and answer with complete solution
and units. Use the steam tables provided and use 4 decimal places
for solving. Final answers shown are in 2 decimal places. Draw
the T-S diagrams properly with respect to the saturation line
A steam power plant uses the ideal Reheat-Regenerative Rankine cycle where
the steam enters the high-pressure turbine at 4 MPa and 300C. It partially
expands to 600 kPa where some steam is extracted for feedwater heating while
the rest is reheated to the same temperature. After expanding again, it enters
the condenser at 10 kPa. Sketch the schematic diagram and the TS diagram
with labeled points, and solve for mass taken for feedwater heating, Qa, Qr, Wt,
Wp, Wnet, thermal efficiency, and Steam rate. Neglect the condensate pump
work.
20.01%, 2667.841,1715.52,955.97, 3.74,952.32¹,3
35.69%, 3.78-
kg
kg
kg
kg
kWh
I
Chapter 20 Solutions
EBK NUMERICAL METHODS FOR ENGINEERS
Ch. 20 - 20.1 Perform the same computation as in Sec. 20.1,...Ch. 20 - You perform experiments and determine the...Ch. 20 - 20.3 It is known that the tensile strength of a...Ch. 20 - Prob. 4PCh. 20 - 20.5 The specific volume of a superheated steam is...Ch. 20 - Prob. 6PCh. 20 - In Alzheimers disease, the number of neurons in...Ch. 20 - 20.8 The following data were taken from a stirred...Ch. 20 - Prob. 9PCh. 20 - Concentration data were taken at 15 time points...
Ch. 20 - Prob. 11PCh. 20 - The molecular weight of a polymer can be...Ch. 20 - 20.13 On average, the surface area A of human...Ch. 20 - 20.14 Determine an equation to predict metabolism...Ch. 20 - 20.15 Human blood behaves as a Newtonian fluid...Ch. 20 - 20.16 Soft tissue follows an exponential...Ch. 20 - 20.17 The thickness of the retina changes during...Ch. 20 - 20.18 The data tabulated below were generated from...Ch. 20 - The shear stresses, in kilopascals (kPa), of nine...Ch. 20 - 20.20 A transportation engineering study was...Ch. 20 - The saturation concentration of dissolved oxygen...Ch. 20 - For the data in Table P20.21, use polynomial...Ch. 20 - 20.23 Use multiple linear regression to derive a...Ch. 20 - 20.24 As compared to the models from Probs. 20.22...Ch. 20 - 20.25 In water-resources engineering, the sizing...Ch. 20 - 20.26 The concentration of total phosphorus and...Ch. 20 - 20.27 The vertical stress under the corner of a...Ch. 20 - Three disease-carrying organisms decay...Ch. 20 - 20.29 The mast of a sailboat has a cross-sectional...Ch. 20 - 20.30 Enzymatic reactions are used extensively to...Ch. 20 - 20.31 Environmental engineers dealing with the...Ch. 20 - An environmental engineer has reported the data...Ch. 20 - The following model is frequently used in...Ch. 20 - 20.34 As a member of Engineers Without Borders,...Ch. 20 - 20.35 Perform the same computations as in Sec....Ch. 20 - 20.36 You measure the voltage drop V across a...Ch. 20 - Duplicate the computation for Prob. 20.36, but use...Ch. 20 - The current in a wire is measured with great...Ch. 20 - 20.39 The following data was taken from an...Ch. 20 - It is known that the voltage drop across an...Ch. 20 - Ohms law states that the voltage drop V across an...Ch. 20 - 20.42 Repeat Prob. 20.41 but determine the...Ch. 20 - 20.43 An experiment is performed to determine the...Ch. 20 - Bessel functions often arise in advanced...Ch. 20 - 20.45 The population of a small community on the...Ch. 20 - Based on Table 20.4, use linear and quadratic...Ch. 20 - 20.47 Reproduce Sec. 20.4, but develop an equation...Ch. 20 - 20.48 Dynamic viscosity of water is related to...Ch. 20 - 20.49 Hooke’s law, which holds when a spring is...Ch. 20 - 20.50 Repeat Prob. 20.49 but fit a power curve to...Ch. 20 - The distance required to stop an automobile...Ch. 20 - An experiment is performed to define the...Ch. 20 - The acceleration due to gravity at an altitude y...Ch. 20 - The creep rate is the time rate at which strain...Ch. 20 - 20.55 It is a common practice when examining a...Ch. 20 - The relationship between stress and the shear...Ch. 20 - The velocity u of air flowing past a flat surface...Ch. 20 - 20.58 Andrade’s equation has been proposed as a...Ch. 20 - Develop equations to fit the ideal specific heats...Ch. 20 - 20.60 Temperatures are measured at various points...Ch. 20 - 20.61 The data below were obtained from a creep...
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