[EnergyPlus_Support] Fan Electric Energy Doesn't Change After Increasing the Leaving Chilled Water Temperature Reference

["hidayah.annisanurul@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Hi Groups,

I just simulated 2 models in energyplus. 

The first model is aircooled electric chiller with reference leaving chilled water temperature 7 C. 

And the other model is the same as the first model, but with reference leaving chilled water temperature 10 C. 

I already updated both models with new EIRFPLR based on their specifications.

 

Based on simulation result, cooling/chiller electric energy for the 10 C temperature is lower than the 7 C temperature, which I think it makes sense. 

But, the problem is in fan electric energy. Both models have the same fan electric energy. I think, based on the theory, The 10 C temperature should have higher fan electric energy than the 7 C temperature. 

And I already checked the supply inlet temperature from the output:variable, 

for some zones, the supply inlet temperature in 10 C model is lower than the 7C model. (For example, at the same time and date, in 7 C model, the supply inlet temperature is 13 C, meanwhile, in 10 C model, the supply inlet temperature is only 12 C). I think it is weird because the higher leaving chilled water temperature (10 C) model can produce lower supply air inlet temperature. And of course, It will impact the fan electric energy (in this case, I use the fan:onoff for the supply fan). 

But, it doesn't happen to all zones. Some zones in 10 C leaving chilled water temperature have higher supply inlet temperature compare to the 7 C model. So, in those zones, the fan electric energy are higher as expected.  

Does anyone knows how energyplus calculate the supply inlet temperature for each timestep? And Does the cooling supply air temperature setpoint in sizing:zone also impact the supply inlet temperature for the next timestep? 

And does anyone have the same experience? or any idea? I really need any kind of help

Thanks

  

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Posted by: hidayah.annisanurul@xxxxxxxxx

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