Total Dynamic Head 1

[Mike1833]

I'm new at designing pumping systems and am currently determining the total dynamic head of a closed loop water cooling system.

Should the pump itself be included for a head loss in the total dynamic head. I'm having trouble visualizing that the pump itself will have to be included.

Also, since it is a closed system, intuitively I would not think to add elevation head. However, what about in the case of priming the pump? Wouldn't that pump need to overcome elevation head to prime a closed loop system? Thanks.

When dealing with headloss in filters, I decided to assume a dirty filter with a pressure drop of about 15psig in a 40-80 gpm application. My reasoning is that the pumps are going to need to overcome that worst case scenario. Im looking for guidance on a reasonable head loss asssumption when it comes to filters.

Your thoughts are appreciated!

 

[MJCronin]

Should the pump itself be included for a head loss in the total dynamic head ?------No, there is no infromation available on pressure drop through a pump

Wouldn't that pump need to overcome elevation head to prime a closed loop system?------ The TDH for a closed loop system is the larger of the friction pressure drop through the system and the height of the largest vertical head (It is assumed that the circulation pump will be used to "fill" the system)

When dealing with headloss in filters, I decided to assume a dirty filter with a pressure drop of about 15psig in a 40-80 gpm application ---- IMHO This may be high, Contact your filter vendor ( or contact a vendor who makes similar filters) and ask for help..... I believe that 2-4 psid may be more correct.

My opinions only....