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[EnergyPlus_Support] Natural vs. mechanical ventilation - difference in heating loads
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- Subject: [EnergyPlus_Support] Natural vs. mechanical ventilation - difference in heating loads
- From: <farhang.tahmasebi@xxxxxxxxx>
- Date: 14 Jan 2014 05:59:37 -0800
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- Delivery-date: Tue, 14 Jan 2014 06:59:46 -0700
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Hi,
Using HVACTemplate:Zone:IdealLoadsAirSystem object in EnergyPlus 8.1.0, I compared the Zone Ideal Loads Supply Air Sensible Heating Energy in 2 models:
A) With an ideal load system, with no outdoor air provided by system, and an infiltration of 0.01 m3/s
B) With an ideal load system with 0.01 m3/s outdoor air provided by system, no heat recovery, no economizer and no infiltration.
However, despite the equal amount of outdoor air provided, the Zone Ideal Loads Supply Air Sensible Heating Energy in model B is 27% lower that model A. Does it make sense?
I found out that the average amount of outdoor air that comes actually to the zone (based on the outputs) is 0.0104 m3/s in model A and 0.0102 m3/s in model B. But this difference can not explain that 27% relative deviation.
Can somebody explain this? Does it make a difference that we bring the outdoor air via windows or a mechanical system without heat recovery?
Regards,
Farhang
Univ. Ass. M.Sc. Farhang TahmasebiDepartment of Building Physics and Building EcologyVienna University of TechnologyKarlsplatz 13, 1040 Vienna, Austriae-mail: farhang.tahmasebi@xxxxxxxxxxxx
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