I have a limited space in which to put a condenser ( 25 x 14.5 x 2.5 cm and i required about 650 cm^2 area. At the moment I have proposed simply using bent piping (180 degree bends to form parallel tubes - looks like a snake shape) with water flowing through it. I can get the required area but the bends at the end of the tubing are very tight so we hit manufacturing difficulties...in the order of 1 pipe diameter. Welding is an option but it is a lot of welds and going to end up quite expensive for what seems quite simple.
The constraints are the volume and the feed points which are fixed at 140 mm apart
Another idea we have had is to simply increase the bend diameter but then weld on flat metal plates at right angles to the tube to make up the lost area. This seems possible but I haven't yet got down to solving the little differential equation that pops up to check the net energy transferred.
So any ideas for a cost effective easy to implement solution or an easier reasonably accurate way to calculate the amount of energy transfered when i weld the flat plates on.
I am looking also for a text which has the minimum bending radius for pipes.