Hello everyone,
I am currently working on a project which has a design requirement on air side system and water side system. When I tried to enter the details into the LEED online form, I got some confusion which I am listing out here. I require your suggestion or support to make my understanding clear to fill the form. The project is located in Dubai.
The HVAC scheme is that, there are ERU’s, DX units, AHU’s, FCU’s in this project and the scheme is ERU’s will supply the fresh air after energy recovered from the return air. This fresh air will be supplied to all the AHU’s and FCU’s catering different part of the building. While I fill the IEQ P1 form, I came across a number of questions which are listed below.
1. Is it enough to provide the details of ERU’s only in the form or I need to input each and every FCU’S and AHU’S in the form. I believe, I need to input all the FCU’s and AHU’s in the form after categorising them into Single zone and multiple zone units.
2. I believe, single zone system is a system serving a single zone only. Multiple zone system is a system which serves a group of zones.
3. In my project, we have single zone and multiple zone FCU’s and AHU’s. while I enter the IEQ P1, I need to check the single zone and multi zone tick box and enter the details of single zone and multi zone units as required irrespective FCU’s or AHU’s. Am I correct?
4. Those with multi zone AHU’s and FCU’s, the return air is taken back to the AHU’s and FCU’s respectively which will get mixed with the fresh air and will be supplied to each zone. I believe this cannot be considered as a local recirculation units and is not a fan power box unit. So there is no need to use 62MZCalc sheet. I can fill the details of these systems/units directly into the IEQ P1 LEED online sheet in the table provided for MULTIPLE ZONE SYSTEM under Appendix for VRP calculator i.e. Table IEQp1-A1 and Table IEQp1 – A2.
5. Space matric for IEQ says, spaces like electrical and mechanical rooms, restrooms and bathrooms are excluded. Is it ok to exclude these rooms from the IEQ P1 online sheet too i.e. excluding these rooms in the form?
Thanks
Vel
Gustavo De las Heras Izquierdo
LEED Expert181 thumbs up
September 16, 2015 - 11:08 am
1.You have to provide a calculation per each outdoor injection fan (either AHU, ERU...). If this fan serves one single zone (i.e. room) the reviewers are asking to use the online form. Otherwise, use the offline calculator and upload it. You will have to add up the supply air for all the FCU in every zone and the numbers should be consistent with the mechanical schedule.
2.Right
3.See comment #1
4.There are two critical numbers in the calculator: i. outdoor air entering the building (not return), and ii. Supply air (sum of airflow provided by all the FCU in the zone)
5.I would rather check the definition of "occupiable space: an enclosed space intended for human activities, excluding those spaces intended primarily for other purposes, such as storage rooms and equipment rooms, that are only occupied occasionally and for short periods of time." (verbatim from INTERPRETATION IC 62.1-2007-16).
VEL MUTHU
September 29, 2015 - 5:30 am
Many Thanks Gustavo.
Also,
1. Is it ok to use the Online form itself for Multi zone units or it is mandatory to use the 62MZCALC for these Multi zone units?
2. Electro - Mechanical rooms are not regularly occupied rooms so I can leave these rooms from entering it into the Online form correct?
Thanks
Gustavo De las Heras Izquierdo
LEED Expert181 thumbs up
September 29, 2015 - 2:12 pm
1.The reviewers we have dealt with have always asked us to upload the offline calculator.
2.Imho I think electro-mechanical rooms fall under "equipment rooms" category and according to the interpretation IC 62.1-2007-16 they are exempt from ventilation. Keep in mind that some utility providers recommend installing louvered doors, which I think is a best practice to prevent moisture from accumulating in the room.