Unmet Load Hours in Baseline Model

[william_beechinor]

Hello,

I am working on my first IESVE energy model for LEED credits. I am currently getting a huge number of unmet load hours (1710 heating and 2165 cooling) in the baseline model of the office area of our building. I am using the default SYS_Cooling Setpoint and SYS_Heating Setpoint that varies the temperatures between 75F and 80F for cooling and 60F and 69F for heating. I have adjusted the profiles in APpro and have assigned the correct profiles in Apache HVAC as well. I am using the system 6a prototype.

My question is what do I do to correct this issue? For the baseline model I thought all I needed to do was pick the baseline system, set the system setpoints, and let it run. I have been looking through the following guide for help, but I haven't had any luck diagnosing the problem. Any advice?

http://www.iesve.com/support/faq/pdf/un ... -hours.pdf

[farahghanem]

eh... yes I have this issue occasionally, and the first check I do is looking at the sized flow rates and capacities to make sure they "make sense".

You say you have followed that guide, and frankly that is all you need to do to identify the issue as you will be interrogating every possible problem for you unmets.

[yungahhh]

Hi there, I also get this problem more often than not unfortunately... It really bothers me that I keep having problems for my baseline more than so for my proposed. My experience is adjusting 1) flow and/or 2) flow controllers.

For some reason, I always get higher unmet load hours for Lounges/Lobby or space types with higher density. Does anyone have similar experience and your method of curing it?