[Equest-users] Steam loop pumping energy

Jack Manning Jack.Manning at arup.com.au
Tue Oct 14 17:08:07 PDT 2008


Steven

I would not try and eliminate pumping power all together.
To minimise reduce pressure to a low level, apply good mech efficiency so not much heat is added to the loop by the pump.
Then at the end of the process simply do not include pumping energy in your results (i.e. working with totals, subtract the heating water pump energy from the total energy use).
These values can be taken from the sim file. Or the approach I would take is to get an hourly or monthly output file for the all parameters you wish to monitor.

Cheers
Jack

Jack Manning
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MEP - Sustainable Design

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Xavier García Casals
Sent: Wednesday, 15 October 2008 3:32 AM
To: Steven Savich
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Steam loop pumping energy

Steven,
The program will calculate one of the pump input parameters acording to the relationship between power, efficiency, head and flow. Try assigning an almost 0 kW power, and leave another parameter free (for example head) for the programe to use the formula to calculate this parameter instead of overriding the almost 0 kW power.

En/na Steven Savich ha escrit:
David,

Tried that.  The program ignores the 0 pump power input and calculates the required power, even with actual flow and head input.  PS-C report still shows pump energy consumption by the heating water loop pump.

FYI I'm using eQuest ver 3-61e.  Do later or earlier versions allow this 0 kW workaround?

Steven

Steven Savich
Systems West Engineers
411 High Street
Eugene, OR  97401-2427
(541) 342-7210
(541) 342-7220 (fax)
________________________________
From: David S Eldridge [mailto:DSE at grummanbutkus.com]
Sent: Tuesday, October 14, 2008 9:09 AM
To: 'Steven Savich'
Subject: RE: [Equest-users] Steam loop pumping energy

You can use the actual flow and head so the program doesn't crash, but enter a pump power of 0 kW.  "Magic" pump motors.

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Steven Savich
Sent: Tuesday, October 14, 2008 10:52 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Steam loop pumping energy

All,

I'm modeling a university campus building with heat provided by central plant steam boilers, providing 15# steam.  I've done this by eliminating boilers in the model and attaching a steam meter to the hot water loop.

My problem is with pumping energy.  Equest requires that a pump be attached to the hot water loop, but the actual installation has gravity return condensate.  How do I zero out the pumping energy?  I have set pump head = 0, but this gives me pages of error reports.  Any other methods?

Thanks,
Steven

Steven Savich
Systems West Engineers
411 High Street
Eugene, OR  97401-2427
(541) 342-7210
(541) 342-7220 (fax)







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