Determine temperature of flue gases, Chemistry

Assignment Help:

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:

215_flow rate.png

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).


Related Discussions:- Determine temperature of flue gases

Daniel cell, CHANGE IN EMF IN A DANIEL CELL

CHANGE IN EMF IN A DANIEL CELL

Total number of valence electron, The total number of valence electrons in ...

The total number of valence electrons in 4.2 gm N - 3   of ion is ( N A is the Avogadro's number): (1) 1.6N A                               (2) 3.2N A

Bondletgth of nitroalkanes, In nitromethane N-O bondlength is 1.21A° while...

In nitromethane N-O bondlength is 1.21A° while normal N-O bondlength is 1.36 A° and for N=O it is 1.18A°..Explain why

Water treatment, What is calgon n phosphate conditioning n which one is bet...

What is calgon n phosphate conditioning n which one is better?

Elements, which element is the largest size halogen.

which element is the largest size halogen.

Kinetic energy, How might temperature changes in the human body have an imp...

How might temperature changes in the human body have an impact on human health

Chain lengthening of aldoses or killiani-fischer synthesis, Chain Lengtheni...

Chain Lengthening of Aldoses (Killiani-Fischer synthesis) The conversion of an aldose to the next higher member includes the subsequent steps : (a) Creation of a cyanohydrin

Complexometric titrations - types of titrations, Complexometric Titrations ...

Complexometric Titrations - Types of titrations A titration, where an dissolved complex is formed at the equivalence point, is termed as complexometric titration. These types

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd