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NC-2009 EAp2:Minimum Energy Performance

Table 1.4.7A - Baseline Air-Side HVAC System Schedule

Greetings, The issue I'd request for advice and support is related to some reviewer's remarks. 1. It is for Supply Airflow. The baseline system is 5. The calculation reports about design air flow quantities for the Baseline show two different quantities - one for Cooling airflow and the other for Heating airflow. Which one is to be entered in the table? 2. It is for Outdoor airflow (in the same table). Within the Outdoor air systems there are systems which are using outdoor air, but just for pure ventilation purposes - like transformer room, sprinkler room, etc. Should such air be entered in this line (Outdoor Airflow?) Your advice would be highly appreciated. Thanks.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Thu, 11/06/2014 - 21:59

1. If they are not the same enter the higher of the two. 2. This line is for the outdoor air you bring into a space. If it is exhaust air only is does not get entered as outdoor air.
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Jean Marais
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Fri, 11/07/2014 - 06:37

Re: 2. Where does the makeup air come from? Outdoors directly (unconditioned) or from other conditioned spaces (i.e. from outdoors via an AHU and other zone conditioning equipment, conditioned)? What is the fresh air requirement of the space (transformer room)? Lastly, if the loads of the space differ significantly to the other spaces (as is likely for the transformer room), then it should be on a seperate system as per the exception. Right? And then set the "needs" for heating cooling and ODA as they are for a transformer room, i.e. If it is conditioned then Heating Setpoint 5C, Cooling Setpoint 32C, ODA requirement in the proposed = 0. If it is not conditioned then you could handle the exhaust as a process load.

Fri, 11/07/2014 - 08:55

Thanks a lot for the reply. There is however one more clarifying question to this issue. It is for the ventilation systems which are purely exhaust systems - like garage, transformer room and for which the intake is compensated by open doors/grills to the outside. As in table 1.4.7 there is not a separated line for the exhaust air, the only place left is Exhaust Fan Power line. Is this the only place where the fan power of this system is to be entered (without indicating their airflow quantities? Thanks.
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Marcus Sheffer
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Fri, 11/07/2014 - 14:42

If it is a regulated exhaust fan (part of a system) then it gets entered in the 1.4.7 tables. If it is process then it gets entered in table 1.4.4.

Fri, 11/07/2014 - 14:56

Thanks for the reply. If I rephrase the question as: If the ventilation system consists of an exhaust fan only (garage, transformer room) and nothing else, does it mean that I should enter it in 1.4.4. Such fans are also regulated - they follow some control - either by CO2 or by some schedule ( if I enterpred the word "regulated" properly). Thanks.
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Marcus Sheffer
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LEEDuser Expert
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Fri, 11/07/2014 - 15:01

Those are process load fans and are entered in 1.4.4. Regulated does not mean controlled. Regulated means that 90.1 contains a mandatory or prescriptive requirement for the item in question. 90.1 does not have any requirements that would establish a baseline for these exhaust fans so they are considered a process load.

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