I have reviewed previous posts and couldn't find anything quite the same as this, but feel free to direct me to previous post or let me know if it is better suited in different forum.
Background: Was hired to design life test lab HVAC and chilled water systems for motor manufacturer. Owner has swimming pools in test facility with 30 pumps/motors per pool around perimeter pulling water straight out and back into pool (in closed room/chamber). Pool water is to be pumped through heat exchanger with chilled water to maintain 70 deg F pool water. Pumps are assumed to all be nominal 5hp. Space is to be maintained at 75deg F and 50-60% rh. Chiller will provide chilled water to pool water heat exchanger and air handler to condition the space (w/ chilled water coil). Owner's opinion and past experiences with their tests and equipment stated that approx 1/3 of rated hp will to to water as heat and only motor inefficiency will be rejected to space. They do not feel all hp of motor needs to be accounted for.
Question(s): Assuming 30 motors/pumps at 5hp each (pump and motor in conditioned space), what is heat rejected to pool water and what is heat rejected to space? Following ASHRAE calcs with driven equipment in space, total power (motor + inefficiency of motor) must be accounted for and all rejected to pool or space. Does the friction of the water in the pool from the pumps really all convert to heat? (conservation of energy) I'm assuming ineffiency of motor goes to space, and inefficiency of pump mostly goes to water (say 90/10 or 80/20 split), but does the remaining energy of the pumped water transfer to heat within the pool? Any tips on how to convey this to an owner so they understand and buy off on it?
Final thought: Other half of lab is similar but instead of driving pumps the motors drive fans all contained in test chamber/room. Does this behave the same way with the fans? (energy of moving air within room all converts to heat)
Sorry for the long post. Long time follower, first time 'poster'.
Thanks in advance