[Equest-users] Cambridge direct fired units in warehouse space

[Bruce Easterbrook]

I have used infrared heaters in a high bay application but they were 
wall mounted closer to the floor and were used to protect the footings 
from freezing in a mothballed building.  They can be a hazard with 
forklifts running around.  Most high bays use large fans to drive the 
warm air back down and prevent or reduce stratification.  Much depends 
on the warehouse and how it is used.  Many don't have much of an 
occupant load and don't need much fresh air.  Saving heating costs means 
minimizing fresh air. Mostly you are protecting the products stored in 
the warehouse.  ASHRAE has a 30% guideline on their website for 
warehouses which gives some guidance on good design to reduce energy 
consumption.
http://www.ashrae.com/standards-research--technology/advanced-energy-design-guides
Bruce

On 09/08/2012 04:42 PM, Busman, Michael R wrote:
>
> You raise a good point, Bruce.  I forgot to add in my other email if 
> consideration had been given to closed-combustion infrared heating as 
> I was pondering the difficulties in heating high bay areas.
>
> Mike
>
> *From:*equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Bruce Easterbrook
> *Sent:* Thursday, August 09, 2012 1:35 PM
> *To:* Adam Barker
> *Cc:* 'equest-users'
> *Subject:* Re: [Equest-users] Cambridge direct fired units in 
> warehouse space
>
> You have to be careful where you use these types of heaters due to 
> IAQ.  Direct fired units dump the products of combustion into the 
> building as well as fresh air.  So you basically have CO2, CO, and 
> water, minimum going into the building with the air.  There can be 
> other nasties as well depending on how efficient the burn is.  In 
> Canada their application is very limited by law.
> Bruce Easterbrook P.Eng.
> Abode Engineering
>
> On 09/08/2012 04:07 PM, Adam Barker wrote:
>
>     Hello everyone,
>
>     I was recently asked to model the impact of Cambridge 'direct'
>     fried air handling units for a warehouse building compared to a
>     conventional MUA with supply and exhaust. Has anyone had
>     experience with these units?
>
>     They boast a very low fan power consumption (5 hp for 8565 cfm of
>     air), 92% thermal efficiency, and a temperature rise and max
>     discharge temp of 160 F.
>
>     Most of the inputs are straightforward however I am not sure I am
>     modeling the 160 F temperature rise properly.  As of now I have
>     Packaged Single Zone systems and have entered 160 F as both the
>     'zone entering max supply temp' and 'hot deck max leaving temp'.
>     Would this fully capture that temperature rise?  I ask as I am
>     getting about 150-200 unmet heating hours in these zones, even
>     though all other inputs are as per the mechanical engineer. Is
>     this significant, or likely just the difference between how eQuest
>     and the mechanical engineer size their loads? The building is a
>     cold climate (southern Ontario, Canada) LEED building, so I want
>     to make sure I am modeling as much benefit as possible.
>
>     *Adam Barker*, C.E.T., LEED AP BD+C
>
>     Sustainability Project Manager
>
>     Provident Energy Management Inc.
>
>     T: 416-736-0630 x 1874 | abarker at pemi.com <mailto:abarker at pemi.com>
>
>
>
>
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