Thermal Unit Operations
Description
Unformatted Attachment Preview
1
CHEE 3601 Assignment 5
Question 1
You would like to use a plate heat exchanger to cool 45,000 kg/h of alcohol from 55.4àto 43î
Cooling water at 25àwill be used. The water outlet temperature should not be higher than
40î
The channels created by the plates are 0.360 m deep and 0.005 m wide, with a effective plate area of
0.319 m2.
The plates are stainless steel with a thickness 10 mm.
If your initial estimate for U is 2000 W/m2 K, what is the number of plates required? Calculate the heat
transfer coefficients for each fluid, and the overall U. Compare that to your initial estimate of U.
Question 2
A 2.5 cm OD tube is fitted with 5 cm OD annular fins spaced every 0.5 cm, from fin centre to fin centre.
The fins are an aluminum alloy (k=161 W/mK) and are of constant thickness 0.0229 cm. The external
free convection coefficient is 8.5 W/m2K/. For a tube wall temperature of 165 oC and ambient air
temperature of 27 oC, determine the heat loss per meter length of finned tube.
2
Question 3
If I want to add fins to a bare wall, how much will it increase the heat transfer from that wall?
Bare wall: h=40 W/m2K
With fins: h= 30 W/m2K
Fins are rectangular aluminum fins with a length of 50 mm, thickness of 0.5 mm and spaced equally at a
distance of 4 mm (making 250 fins/m).
a) bare wall
b) fins (example 5se numbers above)/
Purchase answer to see full
attachment
CHEE 3601 Assignment 5
Question 1
You would like to use a plate heat exchanger to cool 45,000 kg/h of alcohol from 55.4àto 43î
Cooling water at 25àwill be used. The water outlet temperature should not be higher than
40î
The channels created by the plates are 0.360 m deep and 0.005 m wide, with a effective plate area of
0.319 m2.
The plates are stainless steel with a thickness 10 mm.
If your initial estimate for U is 2000 W/m2 K, what is the number of plates required? Calculate the heat
transfer coefficients for each fluid, and the overall U. Compare that to your initial estimate of U.
Question 2
A 2.5 cm OD tube is fitted with 5 cm OD annular fins spaced every 0.5 cm, from fin centre to fin centre.
The fins are an aluminum alloy (k=161 W/mK) and are of constant thickness 0.0229 cm. The external
free convection coefficient is 8.5 W/m2K/. For a tube wall temperature of 165 oC and ambient air
temperature of 27 oC, determine the heat loss per meter length of finned tube.
2
Question 3
If I want to add fins to a bare wall, how much will it increase the heat transfer from that wall?
Bare wall: h=40 W/m2K
With fins: h= 30 W/m2K
Fins are rectangular aluminum fins with a length of 50 mm, thickness of 0.5 mm and spaced equally at a
distance of 4 mm (making 250 fins/m).
a) bare wall
b) fins (example 5se numbers above)/
Purchase answer to see full
attachment
Explanation & Answer:
3 pages
User generated content is uploaded by users for the purposes of learning and should be used following our honor code & terms of service.
Have a similar assignment? "Place an order for your assignment and have exceptional work written by our team of experts, guaranteeing you A results."
Complete the 
Complete the order payment after filling in the order form. We’ll receive your order and assign it to a writer.
The assigned writer will complete your paper and forward it to our Editing Team for review and approval.
Once approved by the editor, the completed paper will be uploaded to your account for you to download, review and approve.