preasure and volume advice

I am building a solar water heater foor an above ground pool. This is being done on a 8ft by 16ft backboard angled at 45 degrees.16ft being the width.So the heigth at 45 degrees will be 4ft. It will be constructed from 1.5 inch black abs pipe. it will have a header pipe up the left side for intake and one on the right for output.it will have 17 1.5 inch 15 ft long pipes between the headers with reflectors behind each pipe. The total of the pipes will hold about 25 gallons of water.I have a 1 hp pump that pits out 40 gallons a minute. I need to know if the pump will be able to fill all the pipes with the 4 ft rise and still be good on preasure and volume for return to the pool . the collecter will be between the filter and pool. Any help would be apprec.

The height at 45 degrees will be 8 ft x 0.707 = 5.66 ft.

The pump will have plenty of pressure. Actually it will have excess capacity.

The problem will be that unless you have some kind of back pressure control the pipes will have so little back pressure that they may not fill unless you take the flow out of the top of the collector pipe. If you don't take the flow out of the top you will have difficulty getting the air out of the pipes.

I assume that your pump is the filter pump. You shouldn't need an extra pump.

You actually have much more flow than you need. You will get only about 0.5 degree F temperature rise through the heater.

Have you calculated the temperature rise that you will get in the pool? You can get a pretty good temperature improvement if you use one of those "solar fish" things that deposit a thin layer of cetyl alcohol on the surface to retard evaporation. That will probably make more difference than your solar heater.

You really don't need pipes and reflectors for a solar pool heater. You can trickle a thin layer of water between two sheets of plastic and collect it at the bottom to drain back to the pool. You get full effective area and much lower cost of construction. Some people put such a heater on the roof of the house. You get a lot of area at minimum cost.

heater

The smaller the pipes the better the ratio between surface area and volume and thus the greater amount of heat absorbtion. That is why commercial solar panels have a myriad of 3/8" tubes between the headers.