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

zhouzarah zarahzhou at hotmail.com
Thu Feb 25 18:27:46 PST 2016


Thank you so much, Joe, Nick, Keith, Sharad and Julien!Previously, I modeled this as increased infiltration. But your suggestions give me more hint, I need to modify the model for accuracy.
Best regards,
Zarah
To: equest-users at lists.onebuilding.org
From: yjhuang at whiteboxtechnologies.com
Date: Thu, 25 Feb 2016 16:50:35 -0800
Subject: Re: [Equest-users] *****SPAM***** Re: Repost - how to simulate a revolving door


  
    
  
  
    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 ¨C Fundamentals, page 16.13, equation
            37. For stack effect use equation 38. For no wind and no
            stack effect see 2014 ASHRAE Handbook ¨C 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 ¨C see
            this image
            from
              Wikipedia if that isn¡¯t immediately clear:
        
        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
        
          o  
              SPACE
            infiltration (cfm) as calculated,
        
          o  
              local
            windspeed
        
          o  
              ZONE
            temperature
        
          o  
              ZONE
            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 1st
            vs. 2nd 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

                  F  913.564.6380
              
              
                15200
                    Santa Fe Trail Drive

                    Suite 204

                    Lenexa, KS 66219

                    United States
              
            
            
              
                
              
              
                 
              
              
                
              
            
            
              
                *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>:
          
          
             
          
          
            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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