reply
Krow, Thank you for time and patience, I am not a plumber, but a DIY guy with an engineering degree but no experience so I am not familiar with all the terms but I understand theoretical fluid dynamics and flows. And I am having problems finding a plumber who understands this as well.
My system currently has 2 pipes. See attached and here is a explanation I found:
Two Pipe Direct Return Hydronic Loop
The Two Pipe Direct Return Loop utilizes more pipe than the one pipe series loop but all radiators and baseboards receive the same temperature of water therefore it is more even heat than in all the radiators and/or baseboards than the one pipe series loop. Another advantage of two pipe direct return loop over the one pipe series loop is that it can be zoned. Zoning gives you more control over where and when you want heat and this can save you money on the cost of heating. As with many hydronic loop systems the two pipe direct return needs balancing valves. The near boiler piping may need to be modified to prevent large delta T between supply and return.
Additionally I have added an attachment. Please note my modification to the original picture. My modification depicts the fact that all the smaller radiators have a shorter path returning to the boiler therefore receive a greater flow of hot water. The longer baseboard has the greatest internal flow resistance and therefore the least amount of hot water is pumping through it.
On your assumptions.
1. It is not a new baseboard, but we have been there 5 years and the room has always been colder.
2. We do have a circulating pump.
3. We have an automatic fill valve.
4. Currently there are no monoflow tees.
5. Thanks for your suggestions on the force bleeding with a hose tap. That is interesting, However, I just want to cut the pipes once. Do you think the force bleed will work better then then adding the monoflow tee?