See all forum discussions about NC-v4 EAc2
 Subscribe to new posts about NC-v4 EAc2 Post a new question aboutNC-v4 EAc2
See LEEDuser’s guidance on NC-v4 EAc2»
FAQs about EAc2 :

The energy cost offset from onsite renewable energy cannot be used to demonstrate compliance with the prerequisite. Can this cost offset still be credited to the proposed energy cost savings for this credit?

View answers »

Forum discussion

NC-v4 EAc2:Optimize energy performance

Control of Energy Recovery System in the Baseline Building: Is an Economizer required or not?

Default Avatar
Stephan Zweig
Civil Engineer
BLPTK Construction
LEEDuser Basic Member
3 thumbs up

Dear Leed users,

Baseline building based on ASHRAE 90.1-2010:

  1. In my case based on paragraph G3.1.2.11 and in accordance with Section 6.5.6.1 due to the climate zone and the %outdoor air at full design airflow rate “my baseline building” require Heat Recovery System.
  2. Due to the climate Zone from Table G3.1.2.6A  an Economizer is not required.

My question is about the control of the heat exchanger in the baseline building. In paragraph 6.5.6.1 is mentioned: “Provisions shall be made to bypass or control the energy recovery system to permit air economizer operation as required by 6.5.1.1”.

The tables of 6.5.1.1, Table 6.5.1.1A and B mention about control of Economizer.

Also is in the baseline building required an economizer required or not? I mean, Table G3.1.2.6A   and tables  6.5.1.1A and B seems to be in contradiction.

I am waiting gor you comments. Thanx

0
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Fri, 02/14/2020 - 13:35

If Table G3.1.2.6A does not require an economizer for your climate zone then an economizer should not be modeled in the Baseline system, and the heat exchanger would not need to be bypassed to permit economizer operation.

Tue, 02/18/2020 - 07:27

Dear Stephan, You don't need an Economizer at your baseline model. But maybe to consider that you will need a pass to by pass the heat Exchanger. The by pass will controled from Enthalpy conditions or Temperature Conditions it depends on your climate zone.

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.