How to Design a Condenser

Since this is posted in the mechanical engineering section I am guessing that you mean capacitor (condenser is the old automotive name for a capacitor).

http://en.wikipedia.org/wiki/Capacitor

Although there are many other possible options

http://www.google.co.nz/search?hl=en&num=100&ei=zo9gS9bOJ4PkswPRsLiuCw&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CAYQBSgA&q=condenser&spell=1

This discussion may help.

Or are you asking about the steam condenser (heat exchanger) on the exhaust side of the low pressure turbine?

If so, then google heat exchanger institute (HEI) to learn everything you need to know in designing a condenser for a steam powerplant

Also, I would suggest that you learn how to ask questions better, if you expect quick and correct answers