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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Humidification system

The energy consumption of humidification system has to be equal in baseline and Proposed building?? 

Is it considered process load??

In my model the energy consumption of both models is very different, being the same system with the same RH Humidification set-point in both models.

What energy consumption I have to consider in the leed template?

Thanks in advance.

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Thu, 01/11/2018 - 15:30

Yes this is a process load. The energy use can differ and that is allowed. Provide an explanation to the reviewer for why it is different and demonstrate that the same system and settings have been modeled in both.

Fri, 04/20/2018 - 11:34

Hi, we have the same problem with different energy use in humidification. Here is simple description of our project: Baseline: 6 air handling units with humidifier and without heat recovery; supply airflow of each unit is around 34000 cfm, outdoor airflow of each unit is around 4800 cfm Proposed: one air handling unit with humidifier and with rotary heat recovery; supply airflow = outdoor airflow = outdoor airflow of baseline Baseline and Proposed have the same RH humidification setpoint, humidifiers have the same rated capacity, rated power and other parameters. But energy use is different (Baseline - 260 MWh, Proposed 153 MWh). Is it caused by different supply airflow and missing heat recovery in Baseline? Is this explanation sufficient for the reviewer?

Fri, 04/20/2018 - 19:17

Given the information provided the savings is justified. However, the reviewer would likely question why the supply airflow in the baseline is so much greater than the proposed. Something is not right with the baseline supply airflow which is probably causing the more than one would reasonably expect savings.

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