I have been at logger heads with the designers for the past two years, my system has expansion vessel, degasser and pressurisation unit, my highest point is 10 mtrs and my lowest ground level. I have 3 turbocor chillers but only use 1 as my load is approx 280kw with a total design load of 740Kw...
RossABQ thank you, I have checked and the pressurisation unit is set to 3 bar, however this does not solve the problem of why the pressure should be set so high. my chiller's are on the ground floor the primary pump takes it up to the first floor where the secondary pumps are located (20ft max)...
basically I have a closed loop chilled water system set up as a fixed primary-variable secondary, controlled via static pressure switch.
my highest point is 25ft above ground level. my understanding of hydraulics is that if I have a closed system then all I require to do is overcome the friction...
I have a new system that seems to be suffering the problem of the chillers not being able to maintain the setpoint:
equipment:
3 turbocor chillers rated 550Kw each each with a fixed primary pump set at 19 l/s
3 secondary pumps with VSD however using two N+1 controlled by static pressure sensor...
