ASHRAE 90.1 Navigator - Chilled water loops

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luanaepb
VE Graduate
VE Graduate
Posts: 57
Joined: Wed Oct 12, 2011 10:35 pm

ASHRAE 90.1 Navigator - Chilled water loops

Post by luanaepb »

Hello,

I just want to confirm one information related to the chiller water pumps in the chilled water loops.

The Specific pump power that I should enter there is the power consumed by the motor that feeds the pump, divided by the water flow, is this correct?

Regards,

Luana
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johannesG
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Joined: Wed Jun 20, 2012 7:36 am

Re: ASHRAE 90.1 Navigator - Chilled water loops

Post by johannesG »

yes, this should be correct. however I'm not completely convinced how the water side is modeled in IES - I regularly estimate higher pump energy consumption than the modeling results.
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geshen516
VE Student
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Posts: 40
Joined: Mon Oct 06, 2008 1:17 pm

Re: ASHRAE 90.1 Navigator - Chilled water loops

Post by geshen516 »

johannesG wrote:yes, this should be correct. however I'm not completely convinced how the water side is modeled in IES - I regularly estimate higher pump energy consumption than the modeling results.
agree
most researcher would think just follow a cubic law will be ok.
In the real case, pump will never follow cubic law and will only incooperate with fluid network. Pity currently no software can simulate fluid hydro and thermal together with plant and room load calc.
However, by manually change the pump curve, we can get a more reasonable prediction.
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