Hi All friends
I have questions about how to set 90.1 baseline pumps in E+
1) The condense water pumps
90.1 G3.1.3.11 states that Each chiller shall be modeled with separate condenser water and chilled-water pumps interlocked to operate with the associated chiller.
For chilled water pumps it is easy to solved, because we could set CHW pumps in each chiller chilled water branch and of course the chilled water pump will run only the chiller run; but for condenser water pumps I face the problem that I could put cw pumps in chiller condenser water-side branch.
Does E+ requires condenser water pumps to be put only on the condenser water branch?
I think there is two way to do the setting: (1) set headed pumps in the cw supply side branch or (2) set more than one cw tower(same as chiller nos) and for each cw tower put a condenser water pump in the branch.
Which is better? Or Do you have other method?
2) Pump power
90.1requries pump power for chilled water/hot water/condenser water pumps. How to set it? In eQuest usually I use pump head & total efficiency to ensure the power/flow rate(such as 75ft&65% =22W/gpm),
But in E+ I find it difficult to do the same setting. Only motor efficiency can be input, and how about pump efficiency? Is it 78%, I find in the EngineeringReference.pdf “The motor efficiency is an input. Since we need the total efficiency to calculate the nominal power consumption we assume an impeller efficiency of 0,78 for purposes of sizing”. Does it means that the total efficiency is motor efficiency* 0.78 or we can use “Fraction of motor inefficiencies to fluid stream” to control the total efficiency? I really confused.
Many thanks!
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