[Bldg-sim] DOAS system

[Chris Yates]

This discussion has perhaps underlined the differences in terminology  
between the US (where a significant part of development takes place)  
and the rest of the world.

For example, in the UK 90%+ of systems using an AHU are "DOAS" but I'd  
never heard of the term before dealing with E+.

Another thing we have come accross is the applcation of Fancoil  
systems appears to vary significantly between the US and EU. In Europe  
most fan coil systems are augmented by "DOAS". They can also be quite  
advanced pieces of kit with electically commutated (EC) fan motors for  
efficiency.

This is merely my observation from E+ where the Fourpipe fancoil  
object is quite dumb (i.e. Single speed fan that doesn't modulate on/ 
off with the load).

I say quite dumb... It's obviously more clever than me!

Sent from my iPhone

On 27 Mar 2010, at 09:44, "James V Dirkes II, PE" <jvd2pe at tds.net>  
wrote:

> Dear Sambhav,
>
>
>
> There is good information available from ASHRAE which you should  
> read about DOAS.
>
>
>
> A brief understanding is that certain HVAC systems, such as chilled  
> beams, VRF and water-source heat pumps, are used to remove zone  
> sensible cooling or heating loads.  They are very effective at this  
> function but do not provide outdoor air ventilation for the zones.   
> As a result, a separate HVAC system is provided for the express  
> purpose of providing ventilation air.  This is called a Dedicated  
> Outdoor Air System (DOAS).
>
>
>
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
>
>
>
> From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim- 
> bounces at lists.onebuilding.org] On Behalf Of sambhav tiwari
> Sent: Saturday, March 27, 2010 12:37 AM
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] DOAS system
>
>
>
> Hi All,
>              I would like to know what is DOAS system for what  
> purpose it is used .I have only heard about it but not used in any  
> of the projects. It wil be so nice if anyone can tell for what  
> applications it is used.
>
> Thanks
> Sambhav Tiwari.
>
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