nrel / bestest-gsr-archive Goto Github PK

Hi, I am a freshman to energy+ and the BESTEST.
I downloaded Case 600FF and Case 900FF and ran them. I didn't change any setting. But the simulation result is quite weird to me. The zone mean air temperature even increases to 60℃ in winter. It seems unreal. Could anyone tell the possible reason? Thank you.
The red line shows the temperature of Case900FF, and the blue line is the temperature of Case600FF.

I'm making some tests with Bestest Case600 and I realized that there is a big difference between the results for the "Annual Heating Loads" tabulated in the OpenStudio_BESTEST_historical.xlsx file and the results obtained after run the simulation of the "bestest_zips" in the EP-Lauch (v.9.5).
Below there are some prints showing the difference.

EP-Lauch Results

Historical Results

I'm new at this and maybe there is some silly config that explains that, but all the checking I made in the IDF file was ineffective to understand this difference.

Fuel type is not set, which means 200W is not properly accounted in the simulation and results.

In the IDF file for the v8.8 Case 960 zip, the Zone object for the sun space is showing -2 meter for the Y Origin but it should be 0. Here is snippet from the IDF:

Zone,
SUN ZONE, !- Name
0, !- Direction of Relative North {deg}
0, !- X Origin {m}
-2, !- Y Origin {m}
0, !- Z Origin {m}

Here is how the IDF looks in SketchUp:

Interestingly, changing the Zone Y Origin to 0 seems to have no effect on the results.

According to ASHRAE Std 140-2014, section 5.3.4.3, all the CE500-series cases have their infiltration airflow based on CE300 which assumes zero infiltration. When examining the IN.IDF for each of these three cases (per BESTEST Case CE530.zip, BESTEST Case CE540.zip and BESTEST Case CE550.zip), all include the following object with infiltration airflow set to 1 m3/s.

ZoneInfiltration:DesignFlowRate,
infil_gen, !- Name
ZONE ONE, !- Zone or ZoneList Name
infil_initialization, !- Schedule Name
Flow/Zone, !- Design Flow Rate Calculation Method
1, !- Design Flow Rate {m3/s}
, !- Flow per Zone Floor Area {m3/s-m2}
, !- Flow per Exterior Surface Area {m3/s-m2}
, !- Air Changes per Hour {1/hr}
, !- Constant Term Coefficient
, !- Temperature Term Coefficient
, !- Velocity Term Coefficient
; !- Velocity Squared Term Coefficient

I could be mistaken, but thought I should bring this to your attention.

When switching to a different computer I realized that the results zip test case zip files make an otherwise light weight repository excessively large (10 GB). @Myoldmopar what do you think about storing the results in a separate repo named something like "BESTEST-GSR-bestest_zips". Then I can add it to the gitignore on this repo.