[Bldg-sim] Modelling Fan coil units-Three speed motor

[Chris Yates]

Also remember fan coils may only be able to turn down to a certain point
under cooling before the diffuser/ ceiling loses the coanda effect. The
cold air detaches from the ceiling and dumps on occupants.

When designing vav fan coil systems, our engineers typically work to 60%
turn down.

Sent from my Android device. Please excuse typos, etc.
On 20 May 2014 17:40, "Aaron Smith" <asmith at mreng.ca> wrote:

> Rathna,
>
> I think you'll need to estimate the fraction of time that the fan coils
> operate at each speed then calculate an equivalent fan power and enter that
> into eQUEST.
>
> Some thermostats vary the fan speed based on how far the room temperature
> is from setpoint.  You can determine the fan coil's capacity at the 3
> airflow rates based on manufacturer literature or contact your
> representative directly then look at the fan coil unit's load in an hourly
> report to estimate the operational hours at each speed. This sounds like
> too much work for a building with multiple fan coil units though unless you
> can choose a few as representative units for the whole building.
>
> You may want to post this question on the equest-users list to see if they
> have other thoughts.
>
> Aaron
> ‎
> Aaron Smith, P.Eng
> M&R Engineering Ltd.
>
> Sent from my BlackBerry 10 smartphone on the TELUS network.
>   Original Message
> From: Rathna Shree
> Sent: Monday, May 19, 2014 03:30
> To: bldg
> Subject: [Bldg-sim] Modelling Fan coil units-Three speed motor
>
> Dear All,
>
> Fan coil units generally will have a three speed motor which can be both
> automatic or manual. Can this variable speed of the fan coil units taken
> any benefit in modelling. Only constant volume fans can be modelled for FCU
> in equest. If the benefit can be considered, how to model the same in
> equest.
>
> Regards,
> Rathnashree
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