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How does outside relative humidity affects Zone mean air Temperature?

asked 2015-07-12 16:02:03 -0600

hugoalmeida4
85 ●1 ●1 ●5

updated 2020-01-20 13:42:06 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

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

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answered 2015-07-13 10:33:19 -0600

ericringold

10637 ●32 ●8 https://www.nrel.gov/b...

updated 2015-07-13 10:40:28 -0600

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.

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Asked: 2015-07-12 16:02:03 -0600

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Last updated: Jul 13 '15

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How does outside relative humidity affects Zone mean air Temperature? edit