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Re: [EnergyPlus_Support] Natural vs. mechanical ventilation - difference in heating loads



What infiltration model did you use?

The flow rate of infiltration model changes. The air changes rates is bigger. Take a look. In natural ventilation the airflow rates are bigger.

On Jan 14, 2014 2:59 PM, <farhang.tahmasebi@xxxxxxxxx> wrote:
 

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 Tahmasebi
Department of Building Physics and Building Ecology
Vienna University of Technology
Karlsplatz 13, 1040 Vienna, Austria
e-mail: farhang.tahmasebi@xxxxxxxxxxxx



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