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Answer:
Percentage change 5.75 %.
Explanation:Given ;
Given
Pressure of condenser =0.0738 bar
Surface temperature=20°C
Now from steam table
Properties of steam at 0.0738 bar
Saturation temperature corresponding to saturation pressure =40°C
So Δh=2573.5-167.5=2406 KJ/kg
Enthalpy of condensation=2406 KJ/kg
So total heat=Sensible heat of liquid+Enthalpy of condensation
Total heat =4.2(40-20)+2406
Total heat=2,544 KJ/kg
Now film coefficient before inclusion of sensible heat
Now film coefficient after inclusion of sensible heat
=5.75 %
So Percentage change 5.75 %.
Answer:
a) Selection and control of material
b) Control of stress
c) Control of the environment
Explanation:
The measures that can be taken to control and prevent the formation of strss corrosion cracks are:
a) Selection and control of material
It deals with the selection of the best quality material that can resist the stress corrosion cracks to a high extent.
b) Control of stress
It is to control or reduce the intensity of the major stress that causes the stress corrosion cracks.
c) Control of the environment
It includes the prevention of the material from the corrosive environment by removing the component from the region or controlling the environment condition around the object.