‘If you’re going to spend time with me you must realise that I joke a lot. Now what is the problem?’ ‘Well I find the way that heat transfer is calculated rather odd. There seems to be no rigorous theory and a lot depends on fudges like Log mean Temperature Difference and general heat transfer coefficient correlations. It seems too approximate.’ ‘Don’t worry about it,’ I replied. ‘For most systems its perfectly sufficient to design a suitable exchanger on that basis. When you allow for fouling, which itself is difficult to estimate, there is already a lot of uncertainty. Also don’t forget that heat exchanger manufacturers tend to use standard bundle sizes and configurations so all you need to do is make sure your design isn’t undersized. The control system will ensure it works.’ Throughout my little lecture Sylvia listened with a rapt expression, nodding as her understanding increased. ‘The real time where things get tricky is with non-Newtonian fluids or condensation with. We had set out around nine that late-September morning, me in the front of the rented canoe, my husband Brian commanding ship from the stern. Our good friends, Tom and Amanda were paddling along beside us in their own fiberglass 16-footer. We had just gone past the point of land where the last cottages were, when our lunch destination came into view about a mile and half down the lake -- a small island near the far shore.Mandy announced that she wasn't about to waste the last chance to touch up her tan. She laid her paddle across the gunwales and whipped off her sweatshirt. Our canoe slowed at the same time as my husband paused to admire her naked breasts. They were impressive -- smaller than mine but well preserved for a lady in her mid-thirties. Tom didn't seem to mind his wife's display other than to complain he wasn't getting much of a view. I looked back questioningly at Brian and when I saw a smile on his face I decided to go for it. I had unzipped my jacket in the warm weather.
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