From ocuk forums:
Quote:
Originally posted by Cathar
It does matter. Radiators in air-flow series have two drawbacks:
1) They offer 4x the air-flow resistance of radiators in air-flow parallel mode
2) The second radiator is getting air that's warmed up by the first radiator
I crunched the math on a number of scenarios. Unless you start getting some beefy fans onto the job, you can actually get worse temperatures with radiators in air-flow series because the fans can't push as much air through, and the second radiator's efficiency is sorely affected by the first radiator's exhaust air.
Air-flow series is just bad news. You may get slightly better performance than a single radiator with good (read noisy) fans, but I wouldn't expect any more than a 20% drop in water temperatures over a single radiator, and that's a best-case scenario.
You really, really, really want your radiators in air-flow parallel.
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Therefore, I've done this:
Should be better now.