[Equest-users] design flow input vs. SV-A supply flow reporting

[Carol Gardner]

Pretty good, Nick. Thanks for summarizing your understanding of Summary
tabs. Sorry, it was a reach....

On Fri, Oct 8, 2010 at 9:55 AM, Nick Caton <ncaton at smithboucher.com> wrote:

>  First, thanks to Carol for* elevating* my understanding of elevation in
> eQuest  (see what I did there??? it’s a Friday alright)…
>
>
>
> That was always a mystery to me and I’m finding elevation is indeed the
> source of my CFM’s bumping up (not doubling though) on at least one previous
> project.
>
>
>
> That said, Paul:
>
>
>
> I’m pretty sure you can expect any entered zone-level design airflows
> (including exhaust) to potentially override or otherwise mess with system
> level airflow inputs if/when they ever sum to be larger.
>
>
>
> If you specify a system-level design airflow which is below what the loads
> require but not in conflict with any zonal inputs, eQuest appears to simply
> adjust upwards for elevation if >0, then upward to the limits of your
> entered max-flow-ratio, then follows through and spits back unmet load hours
> in the results, as you’d expect, but importantly will *not* inflate your
> system’s design CFM beyond the max-flow ratio to compensate for unmet loads
> – so it may be good to know whatever is doubling the specified CFM in your
> model is probably not related to your load inputs.
>
>
>
> Oh yeah, the system sizing ratio (found on the first tab opening any
> airside system) will inflate your airflows too if it’s above 1.0 – better
> check that.
>
>
>
> Sidenote: The fasted way I know of to check resulting airflow results is to
> be aware of the summary tab.  After a calc, highlight a system within (or
> the project at the top of) the component tree under air-side HVAC and click
> the summary tab underneath the toolbars.
>
>
>
> ~Nick
>
>
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> 25501 west valley parkway
>
> olathe ks 66061
>
> direct 913 344.0036
>
> fax 913 345.0617
>
> *Check out our new web-site @ *www.smithboucher.com* *
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Matthew W.
> Higgins
> *Sent:* Friday, October 08, 2010 10:54 AM
> *To:* Paul Diglio; Carol Gardner; cstalberg at naturalintelligence.us
>
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] design flow input vs. SV-A supply flow
> reporting
>
>
>
> Depending on your system type (VAV) I’ve found that you need to ensure your
> Min and Max flow ratios are set at 1.0 for each system, if appropriate.
> While the system sizing ratio is one thing, flow ratios are another.
>
>
>
> But maybe you’ve tried that already, I don’t know…
>
>
>
> Matthew Higgins, ASHRAE-HBDP, LEED-AP
>
> *Energy Engineer*
>
> * *
>
> *Bridgers & Paxton Consulting Engineers, Inc.*
>
> 4600-C Montgomery Blvd. NE
>
> Albuquerque, NM  87109
>
> 505-883-4111
>
> 505-888-1436  Fax
>
> mwhiggins at bpce.com
>
>
>
> *www.bpce.com*
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Paul Diglio
> *Sent:* Friday, October 08, 2010 9:06 AM
> *To:* Carol Gardner; cstalberg at naturalintelligence.us
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] design flow input vs. SV-A supply flow
> reporting
>
>
>
> Carol:
>
> I am having the same problem with airflow almost double from what I
> specified.  I tried the altitude correction and that did not help.
>
> Does the zone air flow and exhaust rate take preference over the fan flow
> parameters?
>
> Thank you,
>
> Paul Diglio
>
>
>
>
>  ------------------------------
>
> *From:* Carol Gardner <cmg750 at gmail.com>
> *To:* cstalberg at naturalintelligence.us
> *Cc:* equest-users at lists.onebuilding.org
> *Sent:* Fri, October 8, 2010 9:33:46 AM
> *Subject:* Re: [Equest-users] design flow input vs. SV-A supply flow
> reporting
>
> Not stupid at all, If you have your altitude set to anything but 0 eQUEST
> will adjust your cfm accordingly. I always go in and set it manually to
> zero. I think it reads what it is off the weather file.
>
> Carol
>
> On Fri, Oct 8, 2010 at 6:54 AM, Christian Stalberg <
> cstalberg at naturalintelligence.us> wrote:
>
> They say no question is a stupid question.
>
>
>
> Why is my zone level supply flow cfm reported value in the SV-A report
>
> higher than my overall design flow (ASSIGNED-FLOW) value? The
>
> system sizing ratio is set at 1.00 (default).
>
>
>
> Thanks in advance.
>
>
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>
>
> --
> Carol Gardner PE
>



-- 
Carol Gardner PE
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