Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
8th Edition
ISBN: 9781337087315
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 36, Problem 9RQ
What are higher-efficiency refrigerant blends that can be used as long-term replacements for R-22 in residential and light-commercial air-conditioning applications?
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Example (7):
Determine the heating surface area
required for the production of 2.5kg/s of
50wt% NaOH solution from 15 wt% NaOH
feed solution which entering at 100 oC to
a single effect evaporator. The steam is
available as saturated at 451.5K and the
boiling point rise (boiling point evaluation)
of 50wt% solution is 35K. the overall
heat transfer coefficient is 2000 w/m²K.
The pressure in the vapor space of the
evaporator at atmospheric pressure. The
solution has a specific heat of 4.18kJ/
kg.K. The enthalpy of vaporization under
these condition is 2257kJ/kg
Example (6):
5:48 م
An evaporator is concentrating F kg/h at
311K of a 20wt% solution of NaOH to 50wt
%. The saturated steam used for heating is
at 399.3K. The pressure in the vapor space
of the evaporator is 13.3 KPa abs. The
5:48
O
Design a speed warning system that receives on two lines, an indication of the
speed limit on the highway. There are three possible values 45, 55, or 65 MPH.
It receives from the automobile, on two other lines, an indication of the speed of
the vehicle. There are four possible values under 45, between 46 and 55,
between 56 and 65, and over 65 MPH. It produces two outputs. The first, F,
indicates whether the car is going above the speed limit. The second, G, indicates
that the car is driving at a "dangerous speed" _ defined as either over 65 MPH or
more than 10 MPH above the speed limit. The inputs are coded as follows:
Speed limit A
B
Speed
C
D
45 0
0
65
1
1
a) Complete the Truth table for the speed warning system
Inputs
Outputs
A
B
C
D
F
G
b) Write the Minterm expressions for the Output Functions.
c) Minimize the output functions
d) Implement the logic
e) Using LabView, verify the Correctness of the Speed Warning System.
Ex. The cantilever beam shown us, made ofrem steel with = 552 MPa
is
,
ut
subjected to fully reversed load. Neglect shear stress
effect, estimate wheather the beam is safe or not safe at N= lo cycles
9
The beam is machined surface and the operating temp. is 100C.
A
F
200
a=0
N
-200
N
1
L= 10cm
D
time
764
Yze.25 Gm
L
D= 1.3 cm
d = 1 cm
b= 1 cm
-momend
diagram
AA
-FL
at the root of the cantilever, the bending moment is max.
factor
Ex. Repeat Ex. in page (24), with fluctuating load as shown
below. By = 46242,041 = 552 MPa. Find the safety
(NF) using Modified -Goodman, Gerber, and soderberg criterias
F(N).
....400
time
Chapter 36 Solutions
Bundle: Refrigeration And Air Conditioning Technology, 8th + Lab Manual + Lms Integrated For Mindtap Hvac-r, 4 Terms (24 Months) Printed Access Card
Ch. 36 - True or False: Evaporative air-conditioning will...Ch. 36 - What are the advantages of using refrigerated...Ch. 36 - The four major components of an air-conditioning...Ch. 36 - Most compressors are cooled using the ___________.Ch. 36 - What advantage does a thermostatic expansion valve...Ch. 36 - What advantage does a capillary tube have over a...Ch. 36 - The ______expansion device ordinarily must use...Ch. 36 - The most popular refrigerant used in the past for...Ch. 36 - What are higher-efficiency refrigerant blends that...Ch. 36 - What refrigerant blend can be used in retrofit...
Ch. 36 - What types of heat are removed by the evaporator...Ch. 36 - The design boiling point for most evaporator coils...Ch. 36 - What are the three most common types of...Ch. 36 - The large interconnecting line between the indoor...Ch. 36 - The small interconnecting line between the indoor...Ch. 36 - The outside design temperatures in the summerin...Ch. 36 - The dew point temperature tells you how much...
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