RE: [EnergyPlus_Support] HAMT Model: Surface Relative Humidity more than 100%

To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Subject: RE: [EnergyPlus_Support] HAMT Model: Surface Relative Humidity more than 100%

From: "Edward G. Lyon" <eglyon@xxxxxxx>

Date: Thu, 5 Nov 2009 13:44:27 -0500

Accept-language: en-US

Acceptlanguage: en-US

Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx

Delivery-date: Thu, 05 Nov 2009 11:45:02 -0700

Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=lima; t=1257446701; bh=iycyRn+IK0rG7+9Oe9DDXE/JyaUolZLaCFZk6SPsQdQ=; h=Received:Received:Received:X-Yahoo-Newman-Id:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-IronPort-AV:X-Received:X-Received:X-Received:To:Thread-Topic:Thread-Index:Message-ID:References:In-Reply-To:Accept-Language:Content-Language:X-MS-Has-Attach:X-MS-TNEF-Correlator:acceptlanguage:X-Originating-IP:X-eGroups-Msg-Info:From:X-Yahoo-Profile:Sender:MIME-Version:Mailing-List:Delivered-To:List-Id:Precedence:List-Unsubscribe:Date:Subject:Reply-To:X-Yahoo-Newman-Property:Content-Type; b=AYmEmwi023Izbh1wNn/vAOxyvm2ZUxg3vOOxTqIsaOPFab3vkxlxBr9aZYMbAnKpsmyPYTb9RHc/7vX8m0YCU5+67MDmbNYlY/855so3bxzR4r43nAkb7FIVG8lKuBa3

Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=XAIro8Sx/V7CwP/LUmLP8mXLojplNuggbV3UM92dB4Py2Nsrm35GGcmO/zr9IKOF6k3zfM7ZiIUMR8caHCCJXwm3ti9fWnIS8UjsBbhRBxF5TS9yY3wLTD7qa9hMkbt+;

Envelope-to: linda@xxxxxxxxxxxxxx

In-reply-to: <918139.76161.qm@web24405.mail.ird.yahoo.com>

List-id: <EnergyPlus_Support.yahoogroups.com>

List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>

Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx

References: <918139.76161.qm@web24405.mail.ird.yahoo.com>

Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx

Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx

Thread-index: AcpeLoWXvywFxaXOR6OkkkBbA2Tx7gAGD2Zw

Thread-topic: [EnergyPlus_Support] HAMT Model: Surface Relative Humidity more than 100%

I’m not exactly sure how HAMT works, but it is common for other moisture migration programs to use relative humidity over 100% for calculating moisture content of the material beyond the equilibrium at 100%. It would appear that the surface you are looking at gets cold enough to condense some water from the air and actually wet the surface. I am also uncertain how HAMT handles liquid water transport. Depending on the surface material, this may be an accumulation of moisture and not a dripping event. In general, surface humidity over 80% is considered to be sufficient to support mold growth.

Ned Lyon, P.E. (MA)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
781.907.9009 fax
www.sgh.com

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Abdul Murad Zainal Abidin
Sent: Thursday, November 05, 2009 10:42 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] HAMT Model: Surface Relative Humidity more than 100%

Hello,

I am currently simulating several detailed wall constructions using HAMT algorithm. I have included surface RH in the schedules. Several output readings that I found in xEsoView revealed that certain surfaces can achieve RH more than 100%, such as 100.146%. How can this be possible?

Thank you.

Regards,

Murad

__._,_.___

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

__,_._,___