REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Chapter 24, Problem 1RQ
Which is not a pressure or force acting on a TXV diaphragm?
A. Head pressure
B. Evaporator pressure
C. Spring pressure
D. Bulb pressure
Expert Solution & Answer
To determine
The type of pressure or force that does not act on a TXV diaphragm.
Answer to Problem 1RQ
The type of pressure or force that does not act on a TXV diaphragm is Head Pressure.
Explanation of Solution
TXV is a thermostatic expansion valve. It is a component which is used in a refrigeration and air conditioning cycle. It is used for the expansion of refrigerant from the condenser pressure to the evaporator pressure. It controls the amount of refrigerant that which has to be fed from condenser to evaporator. Thermal sensors are installed in this type of expansion device, which maintains a constant superheat in the evaporator.
TXV expansion valve consists of a valve body, a diaphragm, spring, needle and seat, and different types of sensors. The diaphragm which is used in this expansion valve measures the evaporator pressure. The seat in the valve body of a TXV valve is stationary. The needle has an ability to move in the diaphragm. The pressure caused by the bulb acts on the diaphragm and from the other side, its pressure is applied by the evaporator and the spring. The diaphragm moves up and down due to these pressures applied by the different components of TXV. These pressure forces regulate the valve needle at a regular time to open and close.
Therefore, Evaporator pressure, Bulb pressure, and Spring pressure are the active forces which work to move the needle in a TXV diaphragm.
Conclusion:
The pressure or force that does not act on a TXV diaphragm is Head Pressure.
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B:
Find the numerical solution for the 2D equation below and calculate the temperature values for
each grid point shown in Fig. 2 (show all steps).
(Do only one trail using following initial values and show the final matrix)
[T1]
T₂
T3
[T] 1
=
[0]
0
0
d
dx
dx)
(ka)+4(ka)
=
dy
-20xy, k = 1 + 0.3 T
ge
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: +0
العنوان
use only
Two rods fins) having same dimensions, one made orass (k = 85 Wm
K) and the mer of copper (k = 375 W/m K), having of their ends inserted
into a furna. At a section 10.5 cm a way from furnace, the temperature of
brass rod 120 Find the distance at which the ame temperature would be
reached in the per rod ? both ends are ex osed to the same environment.
ns
2.05
۲/۱
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Chapter 24 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
Ch. 24 - Which is not a pressure or force acting on a TXV...Ch. 24 - The needle and seat of a TXV are normally made of...Ch. 24 - The TXV tries to maintain a constant _____in...Ch. 24 - The four types of charges that the TXV uses to...Ch. 24 - Prob. 5RQCh. 24 - When do some TXVs require an external an external...Ch. 24 - Draw a diagram showing how an external equalizer...Ch. 24 - The TXV responds to an increased heat load by A....Ch. 24 - The three factors that determine the capacity of a...Ch. 24 - Explain why the entering liquid pressure has no...
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