[Sbse] ASHRAE Lowdown Showdown Modeling Competition

Alexandra Rempel arempel at uoregon.edu
Sun May 9 14:28:37 PDT 2021

Hi Sue,
It’s great to hear your thoughts on this! I sure hope you’re right that natural ventilation will be a prominent strategy here, supplemented by ceiling fans, of course! Passive heating and cooling have not been as popular in the past few years as one might hope, but they’re gaining ground.

And no, I’m not aware of any ASHRAE strategy for calculating air speed reductions for screens and grills. We definitely need something like that!

Intriguingly, the teams are required to choose and defend their own indoor air temperature setpoints; in the past, the adaptive comfort zone has been used sporadically, and the air speed expansion to both standard and adaptive comfort zones has not been fully exploited. I’m hoping this program is an irresistible invitation to do that this year, though!

I would love copies of all of the papers you mention; thank you so much. I’ll look at the HVLS website, as well.

Have you thought about coaching a team for this? There’s plenty of time!
Take care, and thank you again so much for your input!

Alexandra Rempel, Ph.D., M.Arch.
Assistant Professor of Environmental Design
Environmental Studies Program
University of Oregon, Eugene OR  97403

From: Susan Roaf <s.roaf at btinternet.com>
Sent: Saturday, May 8, 2021 5:33 AM
To: Alexandra Rempel <arempel at uoregon.edu>; sbse at uidaho.edu
Subject: Re: [Sbse] ASHRAE Lowdown Showdown Modeling Competition

Dear All,

In that lovely climate there will be many who will want to run their building complexes for as much of the day and year as possible using natural ventilation which is the main way to reduce heating and cooling and ventilation costs in buildings (that is obviously a no-brainer).

Question - Does ASHRAE have a standard methodology for calculating reductions in air movement due to insect screens and security grills?

Ceiling fans will also be key to genuinely low energy buildings.

This begs the question of what temperatures are inbuilt into the models use for acceptable temperatures for fan and natural ventilation use.

Fergus Nicol and I did a paper last November for the Dutch HVAC journal for acceptable temperature ranges for naturally ventilated building - I would be happy to send a copy to anyone interested.

I also have a great paper by Dick Aynsley on calculating fan power etc he did for a book I edited - I can send that too if you are interested. He was an early expert for Big Ass Fans who also have a great resource site on fan design: HVLS Design Guide (bigassfans.com)<https://urldefense.com/v3/__https:/guide.bigassfans.com/__;!!C5qS4YX3!V41rAjKP6Hk9Rq1ESdqV4dV1e9n8wW_XSG8e9PrhE-JSCmsyeAeSunkm3yED2mIrFw$>

In that climate a great idea is to use simple roof space extract fans to pull air through the building from cooler / garden type places - where planting and water etc can lower temps by up to 5C - from a shiny hot sunny equivalent space with hard reflective surfaces - if not more.

I have no doubt that such issues will dominate the submissions - or is this for high energy buildings that need energy 24/7/365 - that cant be....

Good luck with the interesting project.

Best wishes

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