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

[Busman, Michael R]

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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