Thermostat & non thermostat models

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Hi, everybody,
I have modeled a building in eQuest. The existing building has no
thermostat on the baseboard units. I want to show the effect of control
valve (thermostat) fitting on the building energy consumption . Modeling
the units equipped with thermostat is Ok but I do not know how to model the
same building without a thermostat or any trick I can use?
Your help is appreciated,

Thanks,

Ali

nasiri1@gmail.com's picture
Joined: 2018-10-04
Reputation: 0

I am going to give this a heck of a try.
See the explanation below for Baseboard-SCH. This is used when?BASEBOARD-CTRL = OUTDOOR-RESET. Read how to set it up. If you want some non-control, have baseboards fully active at, say 50 DegF. They will respond to outdoor air rather than space conditions. For your space controlled baseboard (THERMOSTATIC), have full baseboards on at 0 DegF.
You might play with this a bit to see how much difference there is between the scenarios.
I find it difficult to comprehend in this day and age baseboards that just RUN.? You COULD just put a constant baseboard load into either an external electric or gas load for that.
John Aulbach, PE

BASEBOARD-SCH

Takes the U-name of a SCHEDULE (TYPE=RESET-RATIO) that defines the relationship between baseboard heat output and outside air temperature, and specifies the days of the year during which this relationship applies. This keyword applies only if BASEBOARD-CTRL = OUTDOOR-RESET. If BASEBOARD-CTRL = THERMOSTATIC, the program will use HEAT-TEMP-SCH to control the baseboards. Note that the DAY-SCHEDULE-PD keywords SUPPLY-HI and SUPPLY-LO, which usually specify temperatures, are used here to specify baseboard output as a fraction of BASEBOARD-RATING.

You must be careful to avoid shutdown of system heating capability (see HEATING-SCHEDULE) during periods when baseboard heating is desired.

Example input:

BASE-DAY-1 = DAY-SCHEDULE-PD
TYPE?????????????? = RESET-RATIO
SUPPLY-HI????????? = 1.0
SUPPLY-LO????????? = 0.0
OUTSIDE-HI???????? = 70.0
OUTSIDE-LO???????? = 0.0? ..

BASE-SCHED-1 = SCHEDULE (or SCHEDULE-PD)
TYPE?????????????? = RESET-RATIO
THRU DEC 31 (ALL)? BASE-DAY-1 ..

SYS-1 = SYSTEM
BASEBOARD-SCH= BASE-SCHED-1
....

In this example, baseboard heat is fully on for outside temperature below 0F and decreases linearly to zero when the outside temperature reaches 70F.

On Thursday, November 8, 2018, 4:24:00 PM PST, Ali via Equest-users wrote:

Hi, everybody,I have modeled a building in eQuest. The existing building has no thermostat on the baseboard units. I want to show the effect of control valve (thermostat) fitting on the building energy consumption . Modeling the units equipped with thermostat is Ok but I do not know how to model the same building without a thermostat or any trick I can use??Your help is appreciated,
Thanks,
Ali_______________________________________________
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John Aulbach's picture
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Joined: 2011-09-30
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Dear John,
Hi, Thank you very much for your extensive reply. I?m sure it will be a
great help and I will try it.

Regards,

Ali

nasiri1@gmail.com's picture
Joined: 2018-10-04
Reputation: 0