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Posted by HeatPro on January 13, 2010 at 08:50:08:
In Reply to: Cast iron radiators in Chicago posted by Steve Silca on January 12, 2010 at 17:55:10:
You were missing the concept of how gravity works upon the water. What is required is a difference in temperature between the top and bottom of a radiator, so the warm water is at the top that cools and falls to the bottom. With no significant difference from the top of the tube in the finned radiator to the bottom, there is no gravity effect.
The system then requires that the difference in height from the top of the entire system to the boiler move the water. Another way of saying that is the other radiators have to start the flow in the finned tube. The water in the finned tube cools and the water in the rest of the system has to move it - not enough motive power for the water in the finned tube. As the other radiators are on their own two-pipe loop, they don't influence the finned tube units on their own separate loop off the mains. The finned tube units need a 006 circulator (booster) on their supply to move the water with the rest of the system.
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