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Re: [EnergyPlus_Support] Re: What's the best way to simulate the



I have not used the finite element combined heat and moisture object yet myself- (mostly because my models require me run finite difference algorithm- but find it interesting for areas of high humidity etc- so if you do put it to use object please let me know..

How it works is similar to the hydrothermal analysis tool WUFI- but with more options- How it works (from my understanding) is you set the algorithm  then setup materials and moisture content of the space.

Object pasted below = Heat Balance algorithm (default is conduction transfer function/200/0.1/1000) 

Algorithm CombinedHeatAndMoistureFiniteElement
Surface Temperature Upper Limit 200
Minimum Surface Convection Heat Transfer Coefficient Value 0.1
Maximum Surface Convection Heat Transfer Coefficient Value 1000

From Energy plus input output reference page 82-86

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Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
 

  






On Sun, Aug 5, 2012 at 6:28 PM, seogchano <seog-chan.oh@xxxxxx> wrote:
 

Thank you Jeremiah
BTW, is the finite element combined heat & moisture object available in current EnergyPlus version? If so, do you know where I can get any reference EnerglyPlus model using the object?
Thank you in advance



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jeremiah Crossett <jcrossett@...> wrote:
>
> impact of Mist (tiny water droplets)?
> MIME-Version: 1.0
> Content-Type: multipart/alternative;
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> Content-Type: text/plain; charset="utf-8"
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>
> You might experiment with the fininite element combined heat & moisture
> object.
>
>
> Sent from my Windows Phone
> From: seogchano
> Sent: 8/5/2012 3:40 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] What's the best way to simulate the
> impact of Mist (tiny water droplets)?
> Hello
>
> To my best understand, EnergyPlus does not provide an object or way to
> represent mist (tiny water droplets) except specifying
> "FractionLatent" of equipment objects. Am I correct?
>
> The problem in using "FractionLatent" value for simulating the impact
> of mist on heating/cooling energy consumption is caused by the fact
> that mist is different from vapor. While vapor is a gas including
> latent heat, mist is actually a liquid. It is true that both vapor and
> mist drive the zone to take more energy for heating/cooling than when
> having a dried air only.
>
> I am not still clear of how to simulate mist in EnergyPlus. Please let
> me know if you know a better way. If using "FractionLatent" for mist
> simulation is the only solution, is there a good approximation
> mathematical function to convert the mass of mist into
> "FactionLatent"?
>
> Thank you
> Seog-Chan
>
>
> --CIqjsOlusts4xfSCa6pOihqO8rTn6dcZD27eHfT
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> Content-Transfer-Encoding: quoted-printable
>
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> ent-Type"></head><body><div><div style=3D"font-family: Calibri,sans-serif; =
> font-size: 11pt;">You might experiment with the fininite element combined h=
> eat &amp; moisture object. <br><br><br>Sent from my Windows Phone<br></div>=
> </div><hr><span style=3D"font-family: Tahoma,sans-serif; font-size: 10pt; f=
> ont-weight: bold;">From: </span><span style=3D"font-family: Tahoma,sans-ser=
> if; font-size: 10pt;">seogchano</span><br><span style=3D"font-family: Tahom=
> a,sans-serif; font-size: 10pt; font-weight: bold;">Sent: </span><span style=
> =3D"font-family: Tahoma,sans-serif; font-size: 10pt;">8/5/2012 3:40 PM</spa=
> n><br><span style=3D"font-family: Tahoma,sans-serif; font-size: 10pt; font-=
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> ct: </span><span style=3D"font-family: Tahoma,sans-serif; font-size: 10pt;"=
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> =20
> =20
> <p>Hello<br>
> <br>
> To my best understand, EnergyPlus does not provide an object or way to repr=
> esent mist (tiny water droplets) except specifying &quot;FractionLatent&quo=
> t; of equipment objects. Am I correct?<br>
> <br>
> The problem in using &quot;FractionLatent&quot; value for simulating the im=
> pact of mist on heating/cooling energy consumption is caused by the fact th=
> at mist is different from vapor. While vapor is a gas including latent heat=
> , mist is actually a liquid. It is true that both vapor and mist drive the =
> zone to take more energy for heating/cooling than when having a dried air o=
> nly.<br>
> <br>
> I am not still clear of how to simulate mist in EnergyPlus. Please let me k=
> now if you know a better way. If using &quot;FractionLatent&quot; for mist =
> simulation is the only solution, is there a good approximation mathematical=
> function to convert the mass of mist into &quot;FactionLatent&quot;?<br>
> <br>
> Thank you<br>
> Seog-Chan<br>
> <br>
> </p>
>
> </div>
> =20
>
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>




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