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Re: [EnergyPlus_Support] Pump: Variable Speed - Rated pump head
So, when we speak about a fan:constantvolume pressure rise, it has the same teorical meaning I guess.
On Monday, June 9, 2014 6:47 PM, "Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Yes! (â??Head lossâ?? = pressure drop)
James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com/>www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Monday, June 09, 2014 12:41 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Pump: Variable Speed - Rated pump head
So it seems to be the the head loss along the circuit, right?
On Monday, June 9, 2014 2:16 PM, "Jim Dirkes <mailto:jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
For a pump system that has already been designed, the rated pump head is the pressure against which the pump must work at full flow
James V Dirkes II
The Building Performance Team Inc
1631 Acacia Dr. Grand Rapids MI 49504
616 450 8653
On Jun 9, 2014, at 12:31 AM, "'<mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx' <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
You need to know the hydronic pressure that you need to overcome. With a bit of study, you could do a rough spreadsheet calculation and put a safety factor on it. Or use industry standards (see ASHRAE 90.1 App. g) for estimating.
> On 07.06.2014, at 19:57, "<mailto:m.aldegheri@xxxxxxxxx>m.aldegheri@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>>
Maybe it's a banal question but, what does E+ mean with the "Rated pump head"?
>> Is it the maximum pressure which the pump can withstand?
>> So it has nothing to do with the graph head[Pa]-flow[m3/h]... right? Or better, the "pressure working condition "of the pump must be compatible with the "rated pump head".
>> I don't undestand this value for the building I'm modelling. It's a 5 storey residential building and this pump is the only pump which provides the circulation of the heating fluid. The heating system is a radiant floor heating, how should I choose a pump? I don't know the losses of hydraulic load and so the needed head.
>>
>> Thanks
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Posted by: Marco Aldegheri <m.aldegheri@xxxxxxxxx>
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