Question-and-Answer Resource for the Building Energy Modeling Community
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Hi @soeren
Zone operative temperature is an average of the Zone mean air temperature and the Zone Mean Radiant Temperature. Since Zone Mean Radiant Temperature is a measure of the combined effect of the temperatures of the surfaces in a space, Zone Operative Temperature also gets affected by the surface temperatures. Did you take a look at the surface temperatures within the zone for these two months? The insulation levels of your envelope, outdoor air temperature, solar gains, internal gains etc. have an impact on the zone operative temperature. My guess would be that the outside air temperature difference (and also solar gains) is causing the zone operative temperature to vary for different months.
That aside, I am trying to understand the purpose of comparing the temp sensor measurements to the zone operative temperature. Are you trying to calibrate the model so that the sensor measurements match the zone operative temperature?
Raghu
