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hmale · 08-08-2002, 02:56 PM

Hi Ben,

The explanation for the use of the methylene blue is right above your last post.

I have learned alot from and have been challenged by your posts and questions Ben (great job!). The question about the elbows is not silly at all and should be explained. As we all know blocks, headers, tees, elbows et al all inhibit flow to varying degrees. In designing this system I knew that I would have to use more fitttings than I would like. What I did was calculate resultant flow taking into consideration the number and nature of the blocks I was going to use, the distance the coolant must travel through the circuit, the resistance to flow relative to distance travelled, number and nature of the fittings, and the impact of the radiator design. Once I calculated the expected back pressure in terms of feet head, I plotted the results against the pump's performance curve realtive to back pressure. My findings were that the resultant flow would be in the 300-325 GPH range...more than sufficient for what I am trying to accomplish.

I did not test circuit pressure. Since the temperatures I was reading were very acceptable I did not feel that pressure was going to be problematic. If the temperatures would have been higher than anticipated I would have tested the circuit's pressure in PSI's.

Cheers!

08-08-2002, 02:56 PM	#8
hmale Cooling Savant Join Date: Aug 2001 Location: MIami, Florida Posts: 169	Hi Ben, The explanation for the use of the methylene blue is right above your last post. I have learned alot from and have been challenged by your posts and questions Ben (great job!). The question about the elbows is not silly at all and should be explained. As we all know blocks, headers, tees, elbows et al all inhibit flow to varying degrees. In designing this system I knew that I would have to use more fitttings than I would like. What I did was calculate resultant flow taking into consideration the number and nature of the blocks I was going to use, the distance the coolant must travel through the circuit, the resistance to flow relative to distance travelled, number and nature of the fittings, and the impact of the radiator design. Once I calculated the expected back pressure in terms of feet head, I plotted the results against the pump's performance curve realtive to back pressure. My findings were that the resultant flow would be in the 300-325 GPH range...more than sufficient for what I am trying to accomplish. I did not test circuit pressure. Since the temperatures I was reading were very acceptable I did not feel that pressure was going to be problematic. If the temperatures would have been higher than anticipated I would have tested the circuit's pressure in PSI's. Cheers!