[Equest-users] Table 6.8.1 of ASHRAE 90.1-2007

[Billy Condor]

Thanks for your answer Bruce,


1.       Now, I know the Performance Required for the axial fan cooling tower is calculated by dividing the water flow by the fan motor nameplate power.

2.       This is still confusing for me.

Billy,

De: Bruce Easterbrook [mailto:bruce5 at bellnet.ca]
Enviado el: sábado, 26 de octubre de 2013 21:10
Para: Billy Condor; equest-users at lists.onebuilding.org
Asunto: Re: [Equest-users] Table 6.8.1 of ASHRAE 90.1-2007

Sorry about that, my reasoning was flawed, the answer was not.  Happens when you have a foot in the imperial and metric camps and you don't pay attention.
The performance of a cooling tower would be defined by the fluid flow, the delta T of the water, the water side pressure drop and the energy required to produce this effect.  The efficiency of the fan, the air flow of the fan, any other air side inefficiencies and the motor efficiency is quantified by the energy consumption of the motor.
Bruce
On 26/10/2013 12:18 PM, Bruce Easterbrook wrote:
I can't answer your whole question but the performance required units answer your question. L/s*kW, water flow rate divided by kW.
Bruce Easterbrook P.Eng.
Abode Engineering
On 25/10/2013 12:59 PM, Billy Condor wrote:
Hello everyone,
I have two specific questions about mechanical equipment performance requirements (addressed in the tables 6.8.1 of ASHRAE 90.1-2007).

1. From 6.8.1G: For axial fan cooling towers, the performance required is >= 3.23 L/s.kW. Below this table, it says this: ''Cooling tower performance is defined as the maximum flow rating of the tower divided by the fan nameplate rated motor power''. Just to confirm, the maximum flow rating refers to the water flow rate or to the air flow rate of the fan?
Where can I see this value in the equest report so that LEED reviewers can verify my information is OK?

2. I've often worked with central systems that use chillers. But for some project I see, there are condensing units and evaporative units. My question is what table do these equipment fit better: 6.8.1A, 6.8.1B or 6.8.1D? Please see attached to look at the diagrams.

Please advice,
Regards,

Billy




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