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You may find much informative heat exchanger education at
http://www.youtube.com/watch?v=LsfRQGm4-Lc
http://www.iqsdirectory.com/heat-exchangers/
http://www.youtube.com/watch?v=a6bW8jefL_M
http://www.youtube.com/watch?v=2uUU1btDLW0
http://www.youtube.com/watch?v=jc_hL_tSFzo
http://www.youtube.com/watch?v=hilZKO-29VM
http://www.youtube.com/watch?v=JipA1cnmVZg
http://www.ehow.com/video_4973845_a-heat-exchanger-work.html
http://www.youtube.com/watch?v=4hzseCdeueY
Heat exchanger, heat exchangers by Taiwan leading manufacturer; Sunny Stone Technology Co., Ltd.