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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

Unmet hours in process areas

Hello, The project is Pharmaceutical Manufacturing facility, where a set of parameters such as Temperature, Humidity &Pressure are to be controlled accurately. We have considered the air conditioning for these areas as process loads and modeled identically in base and proposed case. Now, we are facing unmet hour issue in these areas. Is it required to check and fix unmet for these areas or leave it as such because it is modeled as process loads.

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Thu, 09/22/2016 - 17:47

hmmm I would say yes. You fix unmet load hours because you want to compare two models, baseline and proposed. If it is a process load then you should model the same system in baseline and proposed. This should result in identical unmet load hours. If you have to many unmet load hours in a proposed system it means that either the system is not designed correctly (is not meeting thermal load) or it is not modelled correctly. Either way this should be fixed. Does it make sense?

Fri, 09/23/2016 - 09:17

Thank You Santiago. I think the issue is with the modeling constraints in replicating the exact design in the simulation software. Have to find a way to fix the unmet hours. Thanks again.

Fri, 09/23/2016 - 14:39

Make sure this is a process load. It is not always clear in some of these situation that the cooling for a space is elusively process. I would suggest that you provide a narrative in your submission to justify modeling it as process.

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