Release of Therm 8

[Angus Collins]

Hi,

I was wondering when the official release for Therm 8 is scheduled, the transient moisture modeling is an exciting addition?

Also can anyone request to help test this version?

[Robin Mitchell]

Angus

I plan to post THERM 8 this week as a "research" version, so that users can test it. However, I wouldn't do "real" work with it until it has been more thoroughly tested by more users. 

I will post a message on this forum when it is up on our website.

Thanks for your interest !

Robin 

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Robin Mitchell

Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory

[Speckel Support]

THERM 8 has lots of promise but is massively limited by its external boundary constraints. If it cannot account for hourly values over the year, 8760 hours, I cannot see its value in application. Indeed, a min of 5 years is needed for any hygrothermal sim, if not more. Seems to have issues with timesteps greater than 200. As such, it cannot be used against ASHRAE 160 or similar methods. It's only current application is for a couple of weeks over winter, which is not enough time to see moisture related issues.

Regards,

 

Darren O’Dea

Director and Co-Founder

Sent on the go... please 🙏 excuse any typos 🙄 or brevity.

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From: lbnl-...@googlegroups.com <lbnl-...@googlegroups.com> on behalf of Robin Mitchell <rdmit...@lbl.gov>
Sent: Wednesday, January 3, 2024 7:10:43 AM
To: Angus Collins <collins...@gmail.com>
Cc: THERM <LBNL-...@googlegroups.com>
Subject: Re: [LBNL-THERM] Release of Therm 8

 

To view this discussion on the web visit https://groups.google.com/d/msgid/LBNL-THERM/CACF39St1zzjxACXOw8MLVy4DXZ88eAZjLZ6z3CiFvT6wCqe9tA%40mail.gmail.com.

[Angus Collins]

Hi Robin,

That would be great, using it for long term hygrothermic analysis doesn't seem reasonable at this point, however would an overnight condensation analysis be relatively accurate? It may not be at a point to prove building health, however it can still be used for things like a demonstration to help convince builders to add thermal insulation to an interstitial space behind a partion wall.

Angus Collins.

[Paul Caicedo]

Hi,

I found here that it is possible to simulate a year. Is that correct?

"The default Time Step value of 3600 seconds (1 hour) used with the default value of the Number of Time Steps (8670) would result in a simulation at 1 hour intervals for a year."

Thanks,

Paul

[Speckel Support]

Angus,

 

Overnight condensation is meaningless. Ideally, the sim needs to run for at least 3 years to account for heat and moisture seasonal variations.

 

I have played with the hygrothermal sims many times and the largest impediment to testing this application is the time steps and boundary condition limitations. It appears to be a super interesting (and highly complex) project but is very limited in its current state.

 

Regards,

 

Darren O’Dea

Director and Co-Founder

 

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From: lbnl-...@googlegroups.com <lbnl-...@googlegroups.com> On Behalf Of Paul Caicedo
Sent: Sunday, July 14, 2024 2:46 PM
To: THERM <lbnl-...@googlegroups.com>
Subject: Re: [LBNL-THERM] Release of Therm 8

 

Hi,

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