[Equest-users] SPAM Re: Repost - how to simulate a revolving door

Thu Feb 25 16:50:35 PST 2016

It seems to me there are two distinctly different sources of "infiltration" through a 
revolving door -
(1) leakage through the cracks and imperfect seals
(2) bulk air exchange when the door is used and acts like a piston bringing in 
Pi*(r2/4)*ht  volume of outdoor air and exhausting the same of indoor air.

The relative importance of the 2 depends entirely on how much the revolving door is being 
used.
It might be interesting to do some back-of-the-envelope calculations to see.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 2/25/2016 2:06 PM, Keith Swartz wrote:
>
> To estimate airflow through an opening due to wind, see the 2013 ASHRAE Handbook – 
> Fundamentals, page 16.13, equation 37. For stack effect use equation 38. For no wind and 
> no stack effect see 2014 ASHRAE Handbook – Refrigeration, page 24.5. The wind and stack 
> effect equations are in cfm while the one from the refrigeration handbook is heat load, 
> but it might still be helpful for you.
>
> Remember that the wind is not always blowing directly toward the door…unless the 
> building swings on a big weather vane so that the door always points into the wind! The 
> weather file has wind direction in addition to the speed.
>
> Keith Swartz, PE | Senior Energy Engineer
>
> *Seventhwave***
>
> 608.210.7123 seventhwave.org
>
> *From:*Nicholas.Caton at schneider-electric.com [mailto:Nicholas.Caton at schneider-electric.com]
> *Sent:* Thursday, February 25, 2016 11:18 AM
> *To:* sharadcapricious at gmail.com; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Repost - how to simulate a revolving door
>
> Apologies for not contributing sooner(I’ve been in a busy week myself), but I notice a 
> few critical points may have been missed in the discussion so far:
>
> ·The numbers 90.1 cites for window (0.4 cfm/ft2 ) and door (1.0 cfm/ft2) leakage are at 
> NFRC-400 testing conditions (75 pascals).  These represent _maximum_ permissible 
> infiltration in a closed state with head-on windspeed equivalent to 75 Pa.
>
> ·Open windows & swinging doors will infiltrate much more than closed assemblies.  The 
> real-world problem of airflow through free openings is rather complicated depending upon 
> many variables (including relative temperatures, windspeed direction vs. orientation, 
> building pressurization, stack effects, whether and where other nearby openings are 
> occurring…).
>
> ·Conservatively & for a back of envelope / sanity check with free openings, I might 
> consider CFM = hourly windspeed(fpm) x free area(ft2) on an hourly basis.
>
> ·Revolving doors by design are never “open” in the above sense – see this image from 
> Wikipedia <https://en.wikipedia.org/wiki/Revolving_door> if that isn’t immediately clear:
>
> https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTYX--sNe7YSiL32dNddNEwA70qOJEVkJ-9g2KzLDThtNopxEUvSA
>
> So the whole picture is perhaps a bit more complicated than you might have initially 
> thought, but I believe you will find eQuest is generally well-equipped to tackle all of 
> the above!
>
> ·Your weather file has windspeed data that can be used each hour for calculations
>
> ·Looking to your SPACE inputs for infiltration, you can read up on the variety of 
> options for how sophisticated you want to make your simulation.  Most options do account 
> for hourly windspeed.  In all cases, you can define an INF-SCHEDULE to account for 
> behavior like swinging doors & windows opening.
>
> ·If this is all flying a little too high in complexity for your purposes/timeframe, I 
> suggest leveraging the wizards to observe what infiltration schedules and inputs are 
> generated using a few dummy ‘shell’ models.  Note “perimeter” vs. “core” infiltration 
> schedules are commonly generated side by side and will be named accordingly.
>
> ·I’d personally prefer leveraging a custom hourly report for this sort of assessment.  
> Starting variables to spot check my expectations would include
>
> oSPACE infiltration (cfm) as calculated,
>
> olocal windspeed
>
> oZONE temperature
>
> oZONE tstat setpoint
>
> Other thoughts:
>
> ·Ultimately you are going to be making a “Yes/No” decision based on how the temperatures 
> in this space float.  Step back before getting too far into the study and make some 
> decisions regarding what would be subjectively “acceptable” comfort criteria considering 
> anticipated atrium/staircase usage, occupancy profile, & expectations specific to your 
> regional climate/locale.
>
> ·High-level assessment idea, if you don’t want to assess this “manually” via hourly 
> outputs:  You could perhaps most simply create a pair of zone temp schedules reflective 
> of maximum comfort thresholds, then leverage simulation unmet hours inform how often & 
> when you cross those lines.
>
> ·At only 2 stories effects probably won’t be extreme, but keep in the back of your mind 
> that eQuest/doe2 assumes “perfect thermal mixing” within a zone hour by hour.  If your 
> space does not have fans or other means of consistent circulation, there’s potential for 
> buoyancy/stack effects in the real world to result in different conditions on the 1^st 
> vs. 2^nd level.
>
> Probably more than you’re looking for… sorry for the wall of text!
>
> ~Nick
>
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> *Nick Caton, P.E.*
>
> Senior Energy Engineer
> Energy and Sustainability Services
> North America Operations
> Schneider Electric
>
> 	
>
> D 913.564.6361
> M 785.410.3317
> E nicholas.caton at schneider-electric.com <mailto:nicholas.caton at schneider-electric.com>
> F 913.564.6380
>
> 	
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
> United States
>
> http://10.218.104.225:8090/Images/SE.comCapsule.png 
> <http://www.schneider-electric.com/ww/en/>
>
> 	
>
> 	
>
> *Please consider the environment before printing this e-mail
>
> *From:*Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Sharad Kumar
> *Sent:* Thursday, February 25, 2016 3:04 AM
> *To:* equest-users
> *Subject:* Re: [Equest-users] Repost - how to simulate a revolving door
>
> Hi Zarah,
>
> As per my understanding you need to know the cooling load requirement of any space 
> for any time.
>
> For this one can do peak load calculations and try to find out the cooling load 
> requirement of any space at desired time.
>
> I have also referred ASHARE 90.1 and have found that the swinging door has 1 cfm / sq. 
> ft. and windows have 0.40 cfm / sq .ft as infiltration.
>
> ............................................................................................................
>
> eQUEST have the option to input the required infiltration in Internal load tab and input 
> it in as cfm /sq. ft for the space.
>
> The infiltration being input is the total infiltration in that space.
>
> You need to have proper weather file as per location, have some cooling system as per 
> project and proper infiltration as input.
>
> Then from the hourly report being derived from the File< Export File< Hourly result 
> (CSV) and have the finding in cooling end-use energy.
>
> This will help you to find out whether that space at any desired time needs the cooling 
> or not. Additionally one needs to have proper schedules.
>
> The better software to have these kind of analyses is IES-VE but eQUEST can also help.
>
> The design time is the cooling load having the most peak value of cooling energy in 
> Hourly report.If the Cooling requirement is less than 300 hours over the year then may 
> be you can ignore installing cooling system.
>
> If it is for the major part of year then you can choose to have cooling system. Also 
> have a go on the cooling plant requirement size.
>
> Hope this can be helpful.
>
> Thanks,
>
> Sharad. Kumar.
>
> Green Horizon Consulting LLP.
>
> Gurgaon.
>
> 2016-02-24 5:17 GMT+01:00 zhouzarah <zarahzhou at hotmail.com <mailto:zarahzhou at hotmail.com>>:
>
> Dear eQuesters,
>
> Sorry for the repost! I do need your help about this due to time limit. If any one can 
> give a hint, I really appreciate that!
>
> My client requires to do a thermal simulation for a two-story atrium/staircase to check 
> if the cooling system is required for it. The atrium has a revolving door, which 
> revolves once every 30 minutes, and the swing door opens for 30 minutes every 8 hours 
> for shift change. My question is how to simulate the revolving door and swing door in 
> eQuest? I noticed that ASHRAE 90.1-2010 mentioned the infiltration from these two types 
> of doors is 1.0 cfm/ft2 tested at a pressure of at least 1.57 pounds per square foot 
> (psf), but I do not quite understand what this means and how to use this number in my 
> model. If any one has an idea, please give the comments. Thank you so much!
>
> Best regards,
>
> Zarah
>
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[Equest-users] *****SPAM***** Re: Repost - how to simulate a revolving door

[Equest-users] SPAM Re: Repost - how to simulate a revolving door