Length of pipe to cool air

[fahims]

Hello all
I want to cool down air from compressor from 140 °C to about 50 °C and use this heat to warm up around 10 l of product having Cp 0,92 kj/kgK and thermal conductivity 0,167 Kj/m.What should be the the length of the copper pipe assuming any reasonable diameter(3-10mm). Thank you for reading.
Regards
Fahims

 

[TD2K]

I suggest you pull out your heat transfer books. We're happy to help you out with specific questions but the site's purpose is not to provide free engineering service.