HomeMy WebLinkAboutE-Mail (HVAC systems) - 02/05/2009 Page 1 of 1
Krahn, Nicole R.
From: Paul Sobieck [psobieck @tsihvac.com]
Sent: Thursday, February 05, 2009 9:23 AM
To: Krahn, Nicole R.
Cc: Jerry Vandenbush
Subject: 230 Ohio Street- Oshkosh HVAC systems
Attachments: 230 Ohio Street Brewer Htg.pdf
Nicole
Attached are some documents on the HVAC systems for 230 Ohio Street.
Brewer Heating has addressed the problems in regards to your Nov 25 email.
Call me with any questions.
Paul Sobieck P.E.
Temperature Systems, Inc
2200 S. Ashland Ave.
Green Bay, WI 54304
920 - 491 -5232
920 - 499 -4336 fax
psobieck@ tsih va c. com
1/15/2010
February 05,2009
City of Oshkosh - Inspections
Oshkosh, WI
Attn: Nicole Krahn
RE: 230 Ohio Street- Balancing Report
Oshkosh Area Community Foundation
This letter is in reply to your email dated November 25,2008 regarding your concern on
low air flows shown in the balancing reports.
I visited the Jobsite in December of 2008 with Randy from Brewer Heating. We actually
ran into you at the jobsite that day.
Randy and I went over the problem areas.
From that field visit, I generated a report coming up with some suggestions to fix these
problems. (letter attached- Dated December 30,2008)
Brewer Heating addressed and made all the changes I suggested.
Based on my experience on a building/design similar to this one, and situations where
there is less air flow than desired, you will notice problems during the heating season.
During the Cooling season, this system is more forgiving. I am 100% confident that all
these system will perform satisfactorily during the cooling season also.
Therefore even though the airflows are a little low, I am satisfied with the performance of
all the HVAC systems in the building.
Please feel free to contac c:3 h an question ou may have.
Paul Sobieck
Temperature Systems Inc.
2200 South Ashland Ave
Green Bay, WI 54307
920 -491 -5232
December 30, 2008
Brewer Htg
Ripon, WI
RE: Bridgeview — Air balancing
Attn: Randy
Furnace System -1
Design CFM 1,600 CFM
Badger Balancing: 1,173 CFM (preliminary) 932 CFM (fmal)
It was noted that the 14 "x10" duct was installed as 14 "x10" O.D. with insulation
This duct is undersized, which may account for reduced airflow.
I would recommend:
Adding a new 12" round duct (or equivalent) takeoff running parallel with
The existing 14 "xl0" duct to serve room 114 and Cafes -111 and coor -116
This should increase airflow to these rooms
Notes 1) I noticed Badger Balancing did not list Cafe; -111 diffuser on his report.
This diffuser was listed at 200 CFM.
2) Why was Badger Balancing preliminary CFM higher than fmal CFM?
3 At time of site visit it was 5 degrees and these offices were comfortable.
It was heating fine.
Furnace System -3
Design CFM 1,200 CFM
Badger Balancing: 860 CFM (final)
It was noted that that the 8" supplies to the diffusers in room 109 were run "over" the
sprinkler lines. This resulted in the "pinching" of the 8" supplies, which may be the
reason for reduced airflow. This was also noted on the reception -127 diffuser.
I would recommend:
Rerouting the 8" supply to the diffuser in room 127
So it goes around the sprinkler.
Moving the diffusers in room 109 to allow the
8" supplies to avoid crossing the sprinkler mains.
Notes 1) At time of the site visit it was 5 degrees and room 109 was comfortable.
Vestibule 127 was cold. Brewer Heating was going to add electric heat.
2) The GC raised the ceiling 1 foot in room 109 which caused conflicts
With the Sprinkler main and HVAC ductwork.
Furnace System -4
- Design CFM 1,400 CFM * * ** NOT 1600 CFM like BADGER HAS LISTED
Badger Balancing: 1258 CFM (preliminary) 1058 CFM (final)
This furnace is located up in the furnace room. The ductwork is in the attic, therefore I
could not see the ductwork, except for the spiral ductwork that was exposed.
Conf Room Design CFM: 260 Actual CFM: 239 within 8% minus
Denise Design CFM: 130 Actual CFM: 118 within 9% minus
Break Design CFM: 120 Actual CFM: 121 within 1% plus
Andy Design CFM: 130 Actual CFM: 133 within 2% plus
Art Design CFM: 130 Actual CFM: 133 within 2% plus
Mike Design CFM: 130 Actual CFM: 139 within 6% plus
Randy Design CFM: 160 Actual CFM: 175 within 9% plus
Design CFM: 1,060 Actual CFM: 1,058 within 1% minus
Notes 1) I noticed Badger Balancing did not list 3 diffusers
Kim 100 CFM
Outside Mikes office 120 CFM
Outside Conf room 120 CFM
Total Missing: 340 CFM
2 )At time of site visit it was 5 degrees and these offices were comfortable.
It was heating fine.
3) This system is fine. Nothing needs to be done to it
Furnace System -5
Design CFM 1,600 CFM
Badger Balancing: 1246 CFM (final)
This furnace is located up in the furnace room. The ductwork is in the attic, therefore I
could not see the ductwork. The actual layout has changed from the plan according to
Randy.
Notes 1) The layout of the rooms have changed from the plan, therefore
Its hard to determine what is going on.
2) At time of site visit it was 5 degrees and these office were comfortable.
It was heating fine.
3) These are considerably short duct runs, so I am baffled to why
Design CFM's cannot be met.
I would recommend: .
Rebalancing this system. Because of the short duct run, these
Airflows should be able to be obtained.
Please look over my notes and recommendations. Once the ductwork is reconfigured,
rebalance the system and let me know how the system was affected.
Call with questions.
Paul