Lecture 32 (2013). 11. Heat exchangers. 11.1 Types of heat exchangers

Lecture 32 (2013). 11. Heat exchangers. 11.1 Types of heat exchangers. Based on Chapter 11 in the textbook of Cengel and Ghajar (4th edition). Lecture presented by Prof Josua Meyer, Department of Mechanical and Aeronuatical Engineering, University of Pretoria, South Africa. E-mail: [e-mail]

[@dodjicohovi4097]

teaching is not easy I always give A+ to the teachers good job sir and keep up the good work!

[@MichaelMatusowsky2010]

I m a computer engineering student at your University. I was a little bit bored so decided to watch this lecture video. I wish most of the lecturers on campus had your lecturing style. You make everything very simple to understand even to someone who doesn't do the course.

[@Alaakanno]

Thank you for
Great Lec.
Camera man is a HERO.

[@smccool100]

Excellent class Sir Meyers! Enjoyed your delivery thoroughly!

[@malerwi98]

Thanks alot Dr.Josua. I got a chemical engineering degree before 5 years from now and by the chance i saw your lecture on CZcams, its really amazing and i loved it. Subscribed.

[@adityanugraha1103]

Thanks Prof Josua Meyer

[@faizahat6510]

thank prof.. this vedio more helpful for me... good idea simple and perfect

[@faizisafiee8131]

Thanks for the knowledge...I really appreciated that..

[@lautongkai5292]

I like your lecture, professor!

[@mangpoa64]

thanks for easy to understanding of lecture and nice-shot^^

[@dilavargoyal3628]

thanks a lot sir :) please dnt stop posting as you have viewers all over the world.. thanks for explaining so perfect

[@CharlydeBrosses]

many thanks for sharing the knowledge.

[@ahmedrabie7821]

thanks Dr for great lec (y)

[@OnthimOSObserver]

very good teacher, puts a lot of efforts in teaching

[@hiimoooo0]

Thank you so much very good explaining and teaching

[@patelnileshkumar1214]

Nice video for understanding of heat exchangers

[@mohamedel-mahdi6330]

Thanks a lot , very good lecture

[@ahsansiddiqui271]

Very easy to understand Sir. Thanks.

[@fatherinms12]

600th subscriber :) good lecture sir!!!

[@bluegrapes2010]

I love you! because you are awesome!

[@mhkhushi]

Many thnks

[@mhkhushi]

Sir ..
Plz give a lecture on finned tube condensor ..how can we design and what are the parameters keep in mind while designing finned tube condensor.

[@imranbabcockuaebabcockuae9013]

I want rotary head information ..Some peple says that's part of excheanger. that's right or not pls tell me

[@arunkumarreddy3950]

sir,in shell and tube HX we use baffles.....if baffles are used there is a chance some amount of heat get absorbed by them,which may reduce the effectiveness of HX...is its true........& if so,the baffles must be very good insulators of heat...is n't

[@UmoKhadeija]

@Abdul Jabbar he said: it doesn't have to be all like that, It can be the other way around also. [before min 02:48]

[@asher5003]

so means that, we need two temperature which hot and cold in order to use heat exchangers. is it possible to use pvc or silicon material for heat exchangers??

[@zishan619]

Hello Professor,
When you say there is a mixing in mixed type of HX, you mean there is no physical mixing but only temperature gradient curve

[@HeatTransfer]

There is no physical mixing for a mixed and unmixed heat exchanger. For unmixed the plates will force the fluid through a specific interfin spacing (channel). With mixed: the flow is free in the transverse direction.

[@Iloveufonzi]

+Josua Meyer your brain is nice

[@subhashedna2011]

Dear Sir, I like your sessions and really amazing. I just want to ask one question regarding the plate and pin heat exchangers which we are using in the air separation plant. how to calculate the heat load and surface area of such type of heat exchangers and what equations they follow while design these brazed plate aluminum heat exchangers.

[@geerrooo]

can i communicate with you and ask you about my heat transfer course

[@eddineked9808]

can you sir send me functional analysis of the heat exchanger please .

[@HeatTransfer]

Unfortunately, I do not follow what you mean with "functional analysis. I'm sorry.

[@jaleeda3657]

+Allan Martin It says in the description. Cengel

[@jabbarpower]

Sir, why the hot fluid always in the inner tube never in the outer tube ? many thanks

[@dragosm5891]

heat loss, if you put the hot fluid at the exterior your loss will be greater, and also you will need a more expensive isolating material in a bigger quantity

[@HeatTransfer]

Hot on the inside was an arbitrary choice. Could have done it the other away around also. Heat losses to the environment are negligible as good insulation materials are common practice. The "best" in terms of hot inside or outside is usually more a geometrical choice with reference to available physical tube diameters. For available tubes geometries the Reynolds numbers (and thus Nusselt numbers) will vary. And usually this is what is used to select if hot should be inside or outside.

[@subhashedna2011]

Dear Sir,
i am facing one problem in my company hydrogen compressor which is diaphragm 2 stage . there are two double pipe heat exchangers for each stage one act as internal cooler another is after cooler. 1stage outlet temp is 110 degree cent. @ pressure 25 barg and this cool to 27 degree cent which then further compress to 200 barg in second stage and hot outlet temp is 150 degree cent which again cool to 27 degree cent. and which we using to fill the hydrogen cylinder quads.Here in India in summer cooling water we are getting is at 28-30 degree cent but in this season compressor is tripping on second stage discharge temp which is set at 160 degree cent. give me suggestion how to solve this problem to avoid the tripping of this compressor . hoping a positive reply.

[@moonlight8807]

See how a plate heat exchanger works czcams.com/video/2VG0A7xX3fI/video.html