[Equest-users] 90.1 Supply Fan Energy

Carol Gardner cmg750 at gmail.com
Wed Apr 6 12:37:14 PDT 2011


Check your cfm/sf number in your systems, that would definitely cause this
if it's set too high. Also what field are you using for your OA ventilaton?

Carol

On Wed, Apr 6, 2011 at 12:22 PM, M. Shields <mshields at fstrategies.com>wrote:

> Hi all,
>
>
>
> I am in the process of breaking out the fan energy from my HVAC system per
> ASHRAE 2004 G3.1.2.1, following G3.1.2.9.  The amount of energy coming from
> my fans seems massive and I’m not sure if that is typical, or if I’ve messed
> something up.  I started by setting the temperature difference of 20 degrees
> between supply and desired temp (55/75 cooling and 90/70 for heating) and
> specified 62.1-2004 ventilation for outside air.  I then ran equest and used
> the SV-A reports to get supply CFM for each system.  From that number I then
> used Table G3.1.2.9 to get BHP for each system, which I then converted to kW
> using the formula in ASHRAE.  I then took that number and divided by CFM to
> get kw/CFM and entered this number on the system->fan tab.  When I go to the
> SV-A report the system kW is exactly what I calculated it to be, but the
> energy required for my ventilation fans is about the same as my heating and
> cooling load combined, which seems outrageous.
>
>
>
> Is this typical?  Have I entered it In the wrong way? I would think fan
> consumption would typically be a fraction of the actually heating and
> cooling energy.  Thanks for any thoughts.
>
>
>
> ____________________________
> Michael Shields
> Facility Strategies Group, LLC
>
> 1012 Market Street, Suite 307
>
> Fort Mill, SC 29708
>
> Phone: 803-493-4507
>
> Fax: 803-548-2511
> Email: mshields at fstrategies.com
>
>
>
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-- 
Carol Gardner PE
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