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How does outside relative humidity affects Zone mean air Temperature?

I have 2 custom weather files one with RH always equal to 100% and another one with RH equal to 0%

Why does the zone mean air temperature varies from one weather file to another?

I noticed that without humidity the zone mean air temperature is slightly increased. Why?

ideal-loads-air-system air-temperature

asked 2015-07-12 16:02:03 -0500

updated 2020-01-20 13:42:06 -0500

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My guess would be that since ventilation and infiltration are specified as volume flow rates, the difference in specific volume of the outside air at the two RH conditions affects the mass flow rate in the ventilation/infiltration terms of the zone air heat balance. You could verify this by comparing the 'Zone Infiltration Mass Flow Rate' outputs from both models.

answered 2015-07-13 10:33:19 -0500, updated 2015-07-13 10:40:28 -0500

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