[Equest-users] Modelling Heated Windows in eQuest

[David Berty]

It seems to me that the easiest manipulation would be to modify the windows U-value. You are in essence saying that all or a portion of the heat transfer of cold air in the winter would be cancelled by the coating. Then you could add a false plug load to account for the electricity consumed.

David Berty, P.E.
Baseline Energy Consulting
317.220.9272

----- Reply message -----
From: "Hari Jammulamadaka" <hari.swarup at gmail.com>
To: "John Aulbach" <jra_sac at yahoo.com>
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Modelling Heated Windows in eQuest
Date: Wed, Jul 29, 2015 10:22 PM


Hello all,

Thank you so much for the valuable input. The windows wouldn't consume more than 150W. They have some special coatings to reflect the heat off of the inner surface of the outer window, thereby keeping most of the heat within, and thus effecting having a much lower U value than passive windows (that's what the manufacturer claims). I intend to model that, and then compare that with an experimental setup to see what is really happening.

I'll look through the older treads attached to the mail, and see how baseboard heating works for my setup.

Thank you all again!

Sincerely,
Hari

On Jul 29, 2015 11:11 AM, "John Aulbach" <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>> wrote:
Hari:

Could you possibly use Baseboard heating to simulate the heated windows? Baseboards are usually under windows anyway to mitigate transmission loads. Not sure how you measure the kBtu/kW of your windows, but you can translate into the same heating capacity.

See if the offered eQuest controls for Baseboard satisfy your requirements on the windows.

BASEBOARD-CTRL
Takes a code-word that specifies the control method for baseboard heating in the zone. Defines the control method as THERMOSTATIC using HEAT-TEMP-SCH as the setpoints, or OUTDOOR-RESET to allow BASEBOARD-SCH reset control. This is a zone-level keyword for PLENUM-type zones; it allows "baseboards" to be placed in plenums and allows the simulation of outside or space temperature controlled heaters in the return air space. The plenum heater is activated based on outside air temperature and reset schedule when it is outside controlled. When it is space temperature controlled, and if the interaction with the return air does not result in a temperature above the scheduled value, the heater is turned on. In either case, the source of energy input to the heater is defined by the specified or defaulted value for BASEBOARD-SOURCE. See also BASEBOARD-CTRL, THROTTLING-RANGE and BASEBOARD-RATING. Input for this keyword is the code-word that specifies the method used for controlling the output of the baseboard heating element in the zone.

THERMOSTATIC           Baseboard heating is controlled by a thermostat located in the zone. The program assumes that the baseboards add heat as required, up to their maximum capacity, to maintain zone air temperature within the heating throttling range.If there is a heating load the baseboards are sequenced on first. If the baseboards cannot meet the entire heating load, heating from the zone's air system, if available, will then be activated.

OUTDOOR-RESET         Baseboard heating is controlled by a thermostat located outside the building. In this case the program assumes that the baseboard heating output increases linearly as the outside air temperature decreases. The linear function and the operating period are defined by SYSTEM:BASEBOARD-SCH.

John R. Aulbach, PE
Los Angeles Ca



On Wednesday, July 29, 2015 6:49 AM, Hari Jammulamadaka <hari.swarup at gmail.com<mailto:hari.swarup at gmail.com>> wrote:


Hello,

I am trying to model a building with heated windows (windows with heating elements). The windows are not meant for comfort heating of the building. Just localized heating for improving the comfort conditions in the building. I have looked all over and couldn't find a way to model them. Can someone suggest how I could go about this in eQuest?

Thank you.

Sincerely,
Hari


"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do.  So throw off the bowlines.  Sail away from the safe harbor.  Catch the trade winds in your sails.  Explore.  Dream.  Discover."  --Mark Twain

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