[bldg-sim] eQuest: Two speed AHU

[Graham & Megan]

Pedro,
If the low speed mode is for night cooling only (i.e. full speed during
occupied hours), then you should be able to use the night cycling keywords
(see NIGHT-CYCLE-CTRL).  I haven't applied these to a constant volume system
such as SZRH, but I believe these will allow you to simulate your problem.
I would suggest looking carefully at hourly reports to make sure the night
purge is working as you envisaged as overcooling can easily lead to an
unwanted heating load; you can play with seasonal heating setpoints to
overcome some of this ...
Regards,
Graham
----- Original Message ----- 
From: "Pedro Rodrigo" <pedromanuelrc at yahoo.es>
To: <bldg-sim at gard.com>
Sent: Wednesday, April 06, 2005 1:32 AM
Subject: [bldg-sim] eQuest: Two speed AHU


> Hi all:
> My building has a constant volume AHU with a two speed
> fan, and I'm thinking in using the low speed for night
> and the high speed for day. I'm not sure how to model
> it in eQuest.
> I've realised that the FAN-CONTROL command has an
> option for "two speed" but it's only allowed for PTAC
> system. My AHU is a two-pipe unit.
> Do you have any suggestions to model this system?
> Thanks in advance,
> Regards,
> Pedro Rodrigo
> University of Jaen, Spain
>
>
>
>
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