[BLDG-SIM] Radiant Slabs in eQUEST and LEED

Peter Simmonds Peter.Simmonds at ibece.net
Wed Nov 21 13:39:03 PST 2007


I dont think you have modeled a radiant floor before? If so you wouldnt use your suggestions.

________________________________

From: BLDG-SIM at gard.com on behalf of Karen Walkerman
Sent: Tue 11/20/2007 5:31 AM
To: BLDG-SIM at gard.com
Cc: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Radiant Slabs in eQUEST and LEED



If four-pipe fan coils are used, with fan energy turned off (or down,
to mimic circulator energy), then fan power for ventilation air is not
included.  I have two ideas:

1.  Specify an energy recovery ventilator, with effectiveness of 0%,
and appropriate pressure drops to account for ventilation air fan
power.  I have not tried this, but it might work

2.  Use an airside system, and model radiators in the space.  Remember
to input the panel capacity at the room level!  Adjust the dT and
pressure drop to simulate the radiant floor.  Also, as mentioned
before, lower the setpoint temperature to 68F.  Depending on the
radiant floor system used, you might want to include thermal mass in
the space.  This method allows you to use whatever cooling method and
OA handling method you choose.

If anyone tries #1, let me know!

~karen~

On Nov 19, 2007 5:30 PM, Vikram Sami <VSami at lasarchitect.com> wrote:
>
>
>
> I'm doing an ECB documentation for a LEED 2.1 project using eQUEST. Around
> half of the building uses hydronic radiant floor heating. I am trying to
> model this in eQUEST.
>
> From past threads, suggestions I have come across are:
> 1. Lower the Space temperature to 68F.
> 2. Using the FPH system in eQUEST. This doesn't allow for cooling however,
> and uses no fans (we still have air supply in our building).
>
> 3. Andrew Craig suggested inputting the capacity of the radiant system as an
> internal energy source. (This is great because it allows the fans to cycle
> on/off and maintains the cooling side. It doesn't calculate heating loads on
> the radiant slab though)
>
> What I plan to do is use the FPH system and setback the thermostat to 68F in
> these spaces. This will allow me to calculate the heating energy on the
> radiant coil. I then plan to use Andrew's "internal energy source" method to
> calculate the airside system loads, and add the FPH heat load to that.
>
> Does this seem like a reasonable method to model this?
>
> Vikram Sami, LEED AP
> Direct Phone 404-253-1466 | Direct Fax 404-253-1366
>
> LORD, AECK & SARGENT ARCHITECTURE
>  1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361
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--
Karen Walkerman
Second Law Consulting

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