# ظروري الجواب قبل يوم السبت ارجوكم محتاجه مساعده جدا جدا جدا

#### rooooroooo

##### عضو جديد
A vaporiser is required to evaporate 10,000 kg/h of a process fluid, at 6 bar (Tsat =
57o
C). The liquid is fed to the vaporiser at 20°C. The plant has a spare kettle reboiler available
with the following specification; U-tube bundle, 50 tubes, mean length 4.8 m, end to end.
Carbon steel tubes, inside diameter 25 mm, outside diameter 30 mm, square pitch 45 mm.
Steam at 1.7 bara will be used for heating.
Check if this reboiler would be suitable for the duty specified. Only check the thermal design.
You may take it that the shell will handle the vapour rate.
Take the physical properties of the process fluid as:
liquid: density 535 kg/m3
, specific heat = 2.6 kJ/kgK, thermal conductivity = 0.094 W/mK ,
viscosity 0.12 = mN m-2
s, surface tension 0.85 N/m, heat of vaporization = 322 kJ/kg.
Vapour density 14.4 kg/m3
.

هذا السؤال احتاج الاجابه

وايضا سؤال ثاني
Design an air cooler to cool 30,000 kg/h of diesel oil from 120o
C to 50o
C. The heist
ambient temperature that is exceeded for 40h/year on an average is 40o
C.
Physical properties of diesel oil over the temperature range of interest can be taken as
Petroleum fraction property Petroleum fraction property
Cp (kJ/kgK)
k (W/mK)
 (mNm-2
s)
 (kg/m
3
)
2.1
0.135
1.2
800

شكرا لكم مقدما عيوني