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
I am looking for a circuit similar to a schmitt trigger which use a varying capacitive input and provided a varying frequency output.

Is the dividend paid on common stock taxable to shareholders? The results paid on common inventory are taxed on two stages in the U.S. First at the company stage, as a results c

7 refer(s) to the ability to convert assets to cash quickly and at a fair market price and often increase(s) as one approaches the later stages of the investment life cycle

Lifting wing FP was run at the conditions corresponding to AGARD WG07 TEST CASE 11, namely M∞ = 0.84,α= 3.06 deg. The ‘final step' values of the partially-conservative paramete

I need a project in Load impact in power flow((constant power, constant impedance, constant current, induction motor). Report from 3 articles source and simulation in powerworld s

PROPELLER OVERSPEED GOVERNORS: These devices protect against overspeed, they are separate governors to the P.C.U. and direct oil during an overspeed situation to coarsen the bl

OUTPUT CHARACTERISTICS: Figure shows a "Common Emitter" amplifier stage. Common Emitter Amplifier Stage With no base/emitter bias applied, there will be no collector

A charitable organization wants to design a special ATM machine to be used by needy people. The association supplies the needy person with a pin number to be able to use the ATM

Couplings: Because of the requirement to make maintenance tasks such as engine removal/refit, gearbox removal/refit easier, it is necessary to have a means of coupling the turb

BIPOLAR IC CONSTRUCTION: As mentioned earlier, the components that are commonly used in IC's are diodes, Transistors, resistors and capacitors.  Diffusing impurities into se