For solar collectors, those cold temperatures usually come from calculations of panel stagnation temperature at night. These calculations are when the collector is, or might be, “off” and are important for freeze protection controls. Usually the loop starts to flow and the collector is not stagnate in the final result. It is better to ignore those warnings because to get rid of them you would need to run the fluid all the night long.
EnergyPlus can model ethylene glycol as the loop fluid, see the input fields called Fluid Type and User Defined Fluid Type in the PlantLoop object.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Miroslav Bratanov
Sent: Tuesday, June 26, 2012 1:56 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: GetSpecificHeatGlycol: Temperature is out of range
I get the same warnings too. They show even with the example file SolarCollectorFlatPlateWater.idf. I assume that it is because the fluid in the collector loop is water. That's why the warnings occur when the temperatures are either negative or too high (more than 100 degrees).
I am also curious if this affects the final results. The system that I model will use ethylene glycol as a heat transfer fluid for the collector loop but there is no such option in EnergyPlus.
Has anyone submitted such model for LEED? I wonder how to explain these warnings because in my model there are 581218 of them.
Thank you!
Miroslav
On 3.06.2012 12:43, FrancescoP wrote:
I have the same problem:
sometimes the temperature is too low
************* ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too low) for fluid specific heat
************* ** ~~~ ** This error occurred 58225 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=-9.894200E-003 {C} Min=-11.665963 {C}
and sometimes (actually, a lot of times...) it is too high
************* ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too high) for fluid specific heat
************* ** ~~~ ** This error occurred 3949461 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=277.409112 {C} Min=125.000118 {C}
Any suggestion?
Best Regards
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Omar Tabuyo <omartabuyo@...> wrote:
>
> Dear all,
>
> Anyone knows how i could solve this warnning? I have checked all system nodes temperature and there is not any node which temperature is upper 85ºC
>
> ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too high) for fluid specific heat **
> ** ~~~ ** ..Called From:UpdateSolarCollector Fluid name =WATER,Temperature=129.79
> ** ~~~ ** Environment=RUN PERIOD, at Simulation time=01/06 12:15 - 12:30
>
> Do this warnning modify the simulation results?
>
> What is the warnning meaning?
>
> Thanks
>
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