Still, the zone temperature reports are showing that the systems are unable to meet the setpoints for several hundred hours a year. The boilers and RTUs are autosized based on the systems' needs, and they are showing no unmet hours at all. However, I'm now still showing about 400 hours a year of unmet heating load. By combining both tools in one package significant time. It also offers powerful energy analysis capabilities for comparing energy consumption and operating costs of design alternatives. HAP provides versatile features for designing HVAC systems for commercial buildings. This should mean that the systems have no problem keeping the setpoints and eliminate the pulldown loading. Carrier’s Hourly Analysis Program is two powerful tools in one package. This helped, so to test it further, I put the system thermostats to 24 hour occupied operation, but left the people, equipment, and light loading set to typical occupied/unoccupied hours. So, I reduced the number of degrees of float and started the systems back on occupied operation earlier to try to get the temperature to setpoint by the time the people schedule showed as occupied. So, I thought that the LEED analysis might consider those first hours back in operation when the system is trying to eliminate the pulldown loads from the overnight float as unmet loads.
The system does have unoccupied setback in it. The LEED report shows unmet hours, but the equipment unmet loads reports don't match the LEED reports. The RTU unmet load report shows that the cooling is fine, and the boiler plant unmet load report shows that there are not unmet loads on the equipment. On the cooling side, I have very few unmet load hours, so I'm good there, but on the heating side is where the problems are. Setpoints (occupied/unoccupied) are 72/79 for cooling and 70/63 for heating. The systems are packaged RTU and VAVs with hot water reheat.
I am running simulations and the LEED report is showing that I have almost 2000 unmet load hours on the baseline building. The version I'm running is the latest upgrade, 4.5. I have a problem with HAP that I can't figure out.
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