RE: [EnergyPlus_Support] Re: material conductivity troubleI

Since you have never looked at the result at timestep intervals, you will never solve your problem.

Monthly report should never be used for any research work, except for issuing a certificate on costing.

As none of the materials you specified are not exposed to the exterior environment, the surface propperties do not need to condsider convection or radiation processing

Under steady state condition, the heat transfer amount is proportional to the conductuctivity and temperature difference across the surface.

When the temperature is changing, the material thickness, and the propagation speed are also factors.

I would suggest that you divide one wall into two equal parts and use the two different constructions in the same simulation run.

Use the DesignDay sizing simulation and monitor the temperature values of the exteriior and interior surfaces at timestep and the interior surface convection rates of the two surfaces to the zone.

If you change the wall and floor material or construction at the same time and monitor the monthly averaged result. The day and night time behavior of the surface may be different, and you will never know whoch is doing what.

By doing a timestep reading observation, you are using the EPlus as a caculator for CTF at timestep intervales. The value will change depending on wheather the (ODT - zone AMT) is negative or positive.

The monthly average valuedo not make this observation, and therefore may not provide the correct information.

I did not run the simulation as I have not modied it for the two material and add the relavent variables to display.

Dr. Li

To: energyplus_support@xxxxxxxxxxxxxxx
From: rbmeller@xxxxxxxxxxx
Date: Sat, 3 Nov 2012 21:42:57 +0000
Subject: RE: [EnergyPlus_Support] Re: material conductivity troubleI

Pelicula means shadowing control...

Thanks again for answering my doubts. The density is diferent, sure, but "concreto celular" has lower density, which means has more air inside. So the heat transfer is lower.

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jcrossett@xxxxxxxxxxxxxxx
Date: Sat, 3 Nov 2012 14:37:41 -0700
Subject: Re: [EnergyPlus_Support] Re: material conductivity troubleI

I think you could just attach the file to the email thread-- Not to say the answer will surely be provided. Also density of the material would have an effect.

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com

On Sat, Nov 3, 2012 at 2:34 PM, ricardo_meller <rbmeller@xxxxxxxxxxx> wrote:

I´m considering everything the same for both simulations. I've already checked the same day and the surfaces temperature are still higher for "concreto celular". I´ve also already changed the property of materials to be the same, except about conductivity and density. The roughness are equal. I don´t know how to upload the file that I'm trying to run, if i did, I could upload to someone try to solve the problem. My teacher knows a lot about E+ and neither he could help me... I have a graduating work to delivery next week and it´s blocking me.

__._,_.___

Primary EnergyPlus support is found at: http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx The primary EnergyPlus web site is found at: http://www.energyplus.gov The group web site is: http://groups.yahoo.com/group/EnergyPlus_Support/ Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files. EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___