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CI-v4 EAc2:Optimize energy performance

Baseline Exhaust Energy Heat Recovery

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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
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In ASHRAE 90.1 Table 6.5.6.1 - Exhaust Energy Recovery Requirement where they mention % Outdoor Air at Full Design Airflow Rate are they referring to the "minimum outdoor air" value ? The outdoor airflow rate will vary with the economiser. So is it the minimum value we should to use and compare this to the design flowrate. ?? 

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Thu, 09/12/2019 - 23:27

Based on the title of your question I'm assuming you're asking about when energy recovery is required in the Baseline model, not the Proposed design. The % Outdoor Air would be calculated as (Baseline minimum outdoor airflow calculated per G3.1.2.6) / (Baseline full design airflow rate calculated per G3.1.2.9). You would not use the outdoor airflow in economizer operation to determine whether energy recovery is required.

Wed, 09/25/2024 - 09:00

Dear Tyler, What if % outdoor at full design airflow rate is less than 30%?

Wed, 09/25/2024 - 12:43

Then energy recovery is not required.

Tue, 11/19/2024 - 10:16

Hello, Maybe what I am going to say it is known, but just in case. If you look at the section "G3.1.2.11 Exhaust Air Energy Recovery" it only referers to BUDGET BUILDING DESIGN, which is only for Budget Cost path, not for PRM. If I am wrong correct me, but I understand this reading ASHRAE 90.1-2010.

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