Heat transfer, engineering, Other Engineering

A heat recovery device involves transferring energy from hot flue gases passing counter currently through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm, respectively, and is connected by eight struts to an insulated outer tube of 60 mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m K). Consider the situation for which water and flue gases enter the device at 300 K and 800 K, respectively. The flue gases may be assumed to have properties of air. The mass flow rate of water is 0.2 kg/s. The mass flow rate of flue gases at 1.0 kg/s. If the desired outlet temperature of the pressurized water is 350 K, determine:

i) The outlet temperature of flue gases
ii) The heat transfer coefficient at the water side
iii) The heat transfer coefficient at the air side
iv) The overall heat transfer coefficient based on the inside perimeter (Ui)
v) The required length of this heat recovery device
Hints: 1) The struts can be treated as rectangular fins with an adiabatic tip.
2) Assume a uniform heat transfer coefficient on the flue gas-side (ho).
Posted Date: 3/28/2012 7:29:10 PM | Location : United States







Related Discussions:- Heat transfer, engineering, Assignment Help, Ask Question on Heat transfer, engineering, Get Answer, Expert's Help, Heat transfer, engineering Discussions

Write discussion on Heat transfer, engineering
Your posts are moderated
Related Questions

the speed of an object at the end of 4 succesive seconds is 2o,25,3o and 35 m/sec respectvly, what is the acceleration of this object?

Hi there, I''ve sent an email to you guys about Telecommunication Networks assignment and I haven''t yet received any reply. Pleases let me know if you have received it. Thank yo

Dear Sir, Please answer the follwing question . Specs: Filteration Capacity 18000 LPH , Tested pressure 6Kg/Sq.cm, Vertical MS pressure Sand filter(flat ends 6mm thick & di

Analysis of truste,2D truss analysis using method of joint(cantilever & simply support)?


USE OF MULTICYLINDER ENGINE If, in a multi cylinder engine, power strokes are staggered, the limitation of flywheel can be overcome to a large extent. Torque diagram for 2 cyli

routing sheet for rh shaft

A steak which is 2.5cm thick is cooking in a frying pan which has a 4mm thick base. The electric element used to heat the pan is turned to a level such that the bottom surface of t

can u help me with a reliabilty assignment