Are there any differences is performance letting the hot fluid flow thru the inner pipe and the cold fluid thru the annulus and vice versa??
they're an economic determination for small exchangers that would desire to easily require some accepted tubes. they're additionally a sturdy determination for smaller intense tension applications. the alternative is often one in keeping with economics. there is not any rule that determines the determination technique.
Yes. If you use the hot fluid on the outside you'll have higher heat loss than it would when you use cold fluid on the outside.