Need Pressure Drop Data for SUNMAXX 20 Manifold

Whats wrong with Google?

http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GZAG_enAU459AU459&q=pressure+drop+information+for+the+SunMaxx+20+tube+manifold

http://www.altestore.com/mmsolar/Others/SunMaxx%20Technical%20Manual.pdf

http://www.google.com/url?sa=t&rct=j&q=pressure%20drop%20information%20for%20the%20sunmaxx%2020%20tube%20manifold&source=web&cd=3&cad=rja&ved=0CDIQFjAC&url=http%3A%2F%2Fsmartgreenbuild.com%2Fblog%2Fdownload%2F94%2F&ei=GG2rUanOOaqdiAf2iYDgDQ&usg=AFQjCNEUUfBtkJwPKPFnF3vepPqKCjmXxw&bvm=bv.47244034,d.aGc

this does not address the question. thanks for looking up the SunMaxx manuals. I have them. I am looking for information that is missing from the manuals. I think I said that in my first post.

I think you did but there is so much in the manual about pressure drop that it screams to me that everything is covered.

Page 21 in the second link manual for example states that for collectors in series the pressure drop is simply the various pressure drops added. If running parallel it is the one from the highest pressure drop.

it also says (page 20) to add 50% of the piping pressure loss to account for the bends in the system. Will this not mean the manifold as well?

Last but not least all the diagrams cover pressure loss of various systems. Me thinks that you need to get back to the manufacturer as they need to know if something is seriously missing in the manual.

Can you pin-point exactly where you think the manual lacks the information you need?

I looked up the information about the tube manifold and there it says you chose the length by yourself. So given that it is tube and you know the length the equation is the same as pipe pressure loss.

The simple answer is "no". Manifolds and other items such as heat exchangers have specific pressure drop info. As you indicate, a designer can work out the different Friction Head calculations from standard tables for the material and fittings. Even rusty steel is covered under standard tables.

However in this situation, a particular manufactured manifold is indicated to have pressure drop. The design manual and the installation manual tell us to take it into account by increasing flow velocities, and indicates (with conflicting rules of thumb!) limits which one should work within. They do not provide any numbers...and numbers are what I need for sizing pumps and determining "wiggle" room in the pressure drop allowances for my heat exchangers.

Providing the warnings and the rules of thumb are not enough.

I was hoping to find someone who had dealt with the matter as it cannot be a "first".

Ok, looks for me that this is a case for the manufacturer and a friendly phone call to their service line.

Sorry can't be of more help.

One other thing: If you calculate the margins up and down for flow rates and pipes and manifolds and other items in the system what is the actual difference in pressure and what impact if any will it have on the pump selection? Is it very huge?

Yup - manufacturer call. The question was posted during a Sunday morning brain-storming session. We were hoping to deal with it at the time.

And thanks for taking the time....

Will post the project when we have it built. (24x20 tube array, 64 degrees north latitude)

If your answer is not present in the manual then it 's obvious your question is stupendous which even google don't have. For this, you have to take help from some professional.

Thanks for your comment.

One of the earlier respondents forwarded a slightly different Sunmaxx manual from my own and which included the required information.

This was very appreciated at the time as we were only a week away from departure to begin construction. That is one of the high values of CR4.

The project was constructed during the summer of 2013 and ran for the first time in September.It included (4) 30 tube manifolds and (16) 20 tube manifolds arranged in 5 nodes through 2" iron pipe artery to a 5000 liter reservoir.

The information was needed at the time for pump selection and performance forecasting.

The project is located at 62 degrees north latitude - where summer daylight

hours peak at 19 (+) hours.

All the best for your project.