[Equest-users] Control of Energy Recovery System in the Baseline Building on ASHRAE 90.1-2010 Simulated

[Konstantina Kalliakoudi]

Hi Fred,

thank you for your answer.

So if I understood right ,the baseline building is with bypass of the
enthalpy wheel and with no economizer. And yes, this make sense.

Thank you

Konstantina Kalliakoudi

Konstantina Kalliakoudi
Mechanical Engineer,M.Sc.,

Στις Πέμ, 6 Φεβ 2020 στις 6:23 μ.μ., ο/η Fred Betz <fbetz at aeieng.com>
έγραψε:

> Konstantina,
>
>
>
> It’s not a contradiction as your wheel is only seeing your outdoor flow
> whereas an economizer would see more air flow.
>
>
>
> If you’re 30% outside air at 10,000 cfm you have 3,000 cfm bypassing the
> wheel. The other 7,000 cfm are being returned and never see the wheel.
>
>
>
> If you had an economizer you might get up to twice that flow rate when
> it’s 65F-75F depending on your location’s economizer requirements.
>
>
>
> Yes, it’s economizing, a little but not enough to meet the full
> requirements of an air-side economizer. The intent here is primarily to
> avoid the pressure drop of the wheel while not recovering heat.
>
>
>
> Hope that makes sense.
>
>
>
> Dig into the hourly flow rates and loads to determine that’s working
> properly as the controls can get wonky.
>
>
>
> Good luck.
>
>
>
> Fred
>
>
>
> *Fred Betz*  PhD, LEED® AP BD+C
> Building Performance
>
> *AEI* | AFFILIATED ENGINEERS, INC.
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>
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>
> *From:* Konstantina Kalliakoudi <kalliakoudi.k at gmail.com>
> *Sent:* Wednesday, February 5, 2020 3:55 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Control of Energy Recovery System in the
> Baseline Building on ASHRAE 90.1-2010 Simulated
>
>
>
> Hello to all equest -users,
>
> I am trying to model  my  Baseline building based on ASHRAE 90.1-2010.
>
> In my case:
>
> 1.       In my case based on paragraph G3.1.2.11 and in accordance with
> Section 6.5.6.1 due to the climate zone and the %outdoor air at full design
> airflow rate “my baseline building” require Heat Recovery System.
>
> 2.       Due to the climate Zone from Table G3.1.2.6A  an Economizer is
> not required.
>
> My question is about the control of the heat exchanger in the baseline
> building. In paragraph 6.5.6.1 is mentioned: “Provisions shall be made to
> bypass or control the energy recovery system to permit air economizer
> operation as required by 6.5.1.1”.
>
> The tables of 6.5.1.1, Table 6.5.1.1A and B mention about control of
> Economizer.
>
> Also is in the baseline building required an economizer required or not? I
> mean, Table G3.1.2.6A   and tables  6.5.1.1A and B seems to be in
> contradiction.
>
> I have modeled this in equest as following: What do you think;
>
> [image: image.png]
>
>
>
>
>
>
>
> [image: image.png]
>
>
>
> Thank you
>
>
>
> Konstantina Kalliakoudi
>
>
>
> Konstantina Kalliakoudi
>
> Mechanical Engineer,M.Sc.,
>
>
>
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