[Bldg-sim] Medium-Office HVAC question

Martin Roy martin.roy at mra.qc.ca
Thu May 26 13:58:18 PDT 2011


In my experience electric reheat is the norm some 
older building, before 1970, may have hydronic 
reheat but this is the case in Quebec, Canada.

Martin


At 16:34 26/05/2011, Field, Kristin wrote:
>Content-Language: en-US
>Content-Type: multipart/related;
> 
>boundary="_004_D1168E6C4207B742BFC631BD652B1E922BFDA7817DMAILBOX1nrelg_";
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>Alex,
>
>Sorry to take a little while to respond.  You 
>are correct that the medium office reference 
>building has a gas furnace and electric 
>reheat.  We actually received some opposite 
>industry feedback from what you heard.  We heard 
>that installing gas at the terminal level (vs. 
>on the roof at the RTU for the central furnace) 
>for reheat wouldn’t be done for a building of 
>that size – that installing electric reheat 
>would be simpler and, therefore, more 
>common.  Same for hydronic reheat, especially if 
>the central heating wasn’t hydronic.  I’m 
>curious if your colleague’s answer would change 
>depending on the size of the building.
>
>This highlights one of the difficulties of 
>creating one-size-fits-all reference buildings – 
>there are a lot of different opinions out 
>there!  That said, if there is a large consensus 
>against having electric reheat in the medium 
>office, we would consider changing it whenever 
>any future modifications are 
>released.  Unfortunately, I can’t make any 
>promises about a timeline for that right now.
>
>Anyone else feel like chiming in for the most 
>appropriate system type?  For your “reference,” 
>the medium office building is three stories and about 53,000 sf total.
>
>Kristin
>
>P.S. You’re welcome, and I’m glad you’ve found 
>the reference buildings to be a valuable resource.
>
>***********************************************************************
>Kristin M. Field
>Mechanical Engineer
>Electricity, Resources, and Building Systems Integration Center
>National Renewable Energy Laboratory
>1617 Cole Blvd., MS RSF 202
>Golden, CO  80401
>303.384.7376 phone
>303.630.2055 fax
>
>From: Alex Krickx [mailto:akrickx at seriousmaterials.com]
>Sent: Tuesday, May 24, 2011 3:24 PM
>To: bldg-sim at lists.onebuilding.org
>Cc: Field, Kristin
>Subject: Medium-Office HVAC question
>
>Hello,
>
>First- thanks for the reference buildings! They are a great resource.
>
>I had a question about the HVAC system that is 
>in both the ‘Post 1980’ and ‘New 2004’ Medium 
>Office Reference building (IDFs attached). Does 
>the HVAC system have a gas hook-up for the 
>furnace (item coil:heating:gas) and then use 
>electricity for the reheat (item 
>coil:heating:electric)? I asked a colleague of 
>mine about this, and he said “You would never 
>build a job with gas available on-site and 
>electric reheat, even in the 80s”. My background 
>is more on Building Envelope and also 
>simulation/software more than it is in 
>Mechanical Systems, so I don’t know one way or 
>the other. I was hoping that you could shed some 
>light on the system that was selected.
>
>We’re hoping to use the system as a baseline to 
>investigate window retrofits, and pick the HVAC 
>system that we would most likely encounter in 
>existing buildings. Any information you can provide would be much appreciated.
>
>Thanks in advance,
>Alex Krickx
>
>Alex Krickx, LEED AP
>Building Energy Specialist
>email_sig
>
>1250 Elko Dr, Sunnyvale, CA 94089
>(t) 408.541.8124
>
>Warning: The information contained in this 
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>
>From: bldg-sim-bounces at lists.onebuilding.org 
>[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Field, Kristin
>Sent: Thursday, September 30, 2010 2:07 PM
>To: bldg-sim at lists.onebuilding.org
>Subject: [Bldg-sim] Reference Buildings v1.3_5.0 available on Website
>
>All,
>
>The U.S. DOE Commercial Reference Buildings have 
>been updated to version 1.3_5.0 and posted on the following Website:
>
><http://www1.eere.energy.gov/buildings/commercial_initiative/reference_buildings.html>http://www1.eere.energy.gov/buildings/commercial_initiative/reference_buildings.html
>
>As with the previous release, there are 3 
>vintages of 16 different building types modeled 
>in 16 U.S. climates (3 x 16 x 16 = 768).  Users can download:
>
>·         All 768 EnergyPlus 5.0 input files (.idf format)
>·         All 768 EnergyPlus table output files (.htm format)
>·         All 48 “Scorecard” spreadsheets for 
>each building type in each vintage, summarizing input and output details
>·         Zip file of the 16 TMY2 weather files used (.epw format)
>·         List of changes in models between versions 1.3_5.0 and 1.2_4.0
>·         Table of EUIs [kBtu/sf/yr] for all models in each vintage
>·         Archived versions of previous releases for above files
>
>We appreciate all the valuable feedback we’ve 
>received from users of these models.  Much of it 
>has been incorporated into the changes between versions.
>
>Regards,
>Kristin Field
>
>***********************************************************************
>Kristin M. Field
>Engineer II - Mechanical
>Electricity, Resources, and Building Systems Integration Center
>National Renewable Energy Laboratory
>1617 Cole Blvd., MS 5202
>Golden, CO  80401
>303.384.7376 phone
>303.384.7540 fax
>
>
>
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----------

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Martin Roy et associés
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J7R 1N3


Tel: 450-623-0340
Cell. 514-594-6352

www.mra.qc.ca






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