Cross Flow Heat Exchanger (mixed/mixed): Heat Transfer Examples for Mechanical Engineers

[@diyaazaghloul756]

The greatest explanation over the network

[@mikeschertzer941]

That's very kind of you. Thanks.

[@deepi4gugu]

Professor Mike, thanks for the explanation but @ 6:05 minutes, why Ch is converted into Cc? Is it error?

[@mikeschertzer941]

Good catch. Looks like there is a typo in the slide here and it should be C_h. I think I say this when narrating the slide, but have it written incorrectly on the slide. Thanks for pointing this out and sorry for the confusion.

[@deepi4gugu]

@@mikeschertzer941 Thanks for the reply and correction. However, your's video is very useful and has been well explained.

[@sk-7523]

Thanks for making this so easy. You are great!

[@mikeschertzer941]

No problem. I'm happy that you find them useful!

[@diyaazaghloul756]

Amazing video thank you

[@mikeschertzer941]

I appreciate it. Thanks.

[@abdulkareemvm5858]

Your presentation is easy to understand. Do you have a video where you solve a mixed-unmixed cross flow exchanger?

[@mikeschertzer941]

Thanks for your kind words. Check out this example: kzbin.info/www/bejne/l5eZoX57ms-DmZo

[@fathoniam8997]

Dear professor Mike. Thanks a lot for the video. could you please discuss a detail video to design/sizing an air cooled condenser/evaporator (both unmixed, crossflow, finned tube) ?

[@mikeschertzer941]

I don't think I have a separate video showing that case. But I think the big take away I tried to get students to have from these videos is the process for solving these problems. If you go through the same process described here, I think that you should be able to come up with a reasonable solution. So the path won't be exactly the same as this one, but if you watch this, and then maybe the Exhaust gas (mixed / unmixed) video, I think you should be able to piece together a good model.

[@lovetownbomber]

Hey Mike, your videos are amazing. Is there anyway we could print your slides, the two by two matrix would be perfect to have a hard hard copy of. All of your slides are full of detail, did you create them?

[@m.academie3543]

would be better if you can share the slide

[@m.academie3543]

Hello Mike thanks for sharing, is the LMTD method only valid for counter or parallel flow? or can be also use for cross-flow?

[@sumitchauhan8337]

How to select no. Of fin tubes for steam passed in it for Ms/al/ss-304 and selection of header also.

[@mikeschertzer941]

So that's a bit beyond what we're doing in a video like this. I think you start with trying to size the heat exchanger. Then, you probably have some kind of size constraints in your system. That might lead you to choose how many tubes you want. The interesting thing about heat exchanger design is that there are multiple solutions to the same problem. So you probably want to create some kind of model / solver that lets you determine the heat transfer. Then play around with variables (i.e. what is the length if I pick N tubes with D diameter?; or how many tubes would I need if I have a length L and tube diameters of D?). My understanding of header design is that you want something that gives you as close to uniform flow rates as you can get in all of your tubes (or cross sectional area)...so it's a multidimensional fluids problem.