[Equest-users] Two Primary and one secondary loop for 2-pipe distribution system

Rob Hudson rdh4176 at gmail.com
Thu Dec 8 09:29:55 PST 2011

Since the two loops do not operate at the same time, it would be accurate
to model the system as a 4-pipe system, and use primary loops only.  this
will allow you to turn on/off the loops as required for seasonal changes.

Hope this helps,


On Thu, Dec 8, 2011 at 12:24 PM, Vipul Babriya <vipulbabriya at aol.com> wrote:

> Hello Everyone,
> I am modeling very large office building, which is having central plant
> with chillers and heat exchangers. The heat exchangers provide hot water to
> the 2-pipe loop via two pumps, while the chillers provide chilled water to
> 2-pipe loop via four chilled water pump. The 2-pipe distribution supplies
> chilled and hot water to the AHUs and FCUs located different zones in the
> entire facility.
> The 2- pipe distribution system have no pump. The loop operates year
> around based on heating and cooling requirement. Since, there is no pump in
> 2-pipe distribution system, it uses primary loop pumps (Chilled water pumps
> in summer and hot water pump in winter).
> Is there anyway i can model two primary loops and one secondary loop
> (2-pipe) in the eQUEST?
> Thanks,
> Vipul
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Rob Hudson
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