Natural Ventilation: LEED Energy modeling

Sadaf Alam

LEEDuser Basic Member

0 thumbs up

July 19, 2019

Dear all,

We have an office building which is predominantly cooled by natural ventilation. Natural ventilation is being controlled by the operable windows through BMS. We are doing the thermal simulation in IES-VE. We have gone through the previous discussions from LEED USER and have checked the " LEED advance modelling guide". However we have the following queries;

1) In Baseline , the system will be modeled according to Appendix G. ie. the office areas (which are natural ventilated) have mechanical cooling ?

2) How do we model the proposed natural ventilation strategy for LEED and ensure unmet load hours criteria is adhered to ?

Thanking you all in advance.

Looking forward to the replies

Best Regards

Sadaf

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Sadaf Alam

LEEDuser Basic Member

0 thumbs up

Fri, 07/26/2019 - 08:32

Hello All, I am just following up my last query. It would be much appreciated , if any one of you can answer (based on their experience) my queries mentioned above. Looking forward to the replies. Best Regards Sadaf

Tyler Thumma

7Group

LEEDuser Expert

65 thumbs up

Thu, 09/12/2019 - 20:32

I recommend reading through LEED Interpretation 1734 and Appendix D of the Advanced Energy Modeling for LEED Technical Manual. 1. Yes the Baseline would include mechanical cooling for the spaces which are naturally conditioned in the design 2. This is explained in detail in LI 1734 and Appendix D of the Technical Manual. Essentially the initial Proposed model is simulated with mechanical cooling and no natural conditioning. Then an additional Proposed model is created which includes natural conditioning when it is able to meet the temperature setpoints, and mechanical conditioning for the times when natural conditioning is unable to meet the setpoints. The savings are submitted using an exceptional calculation.