Project: Office Building
Size: 172,223 ft²
Location: New York, NY
Climate Zone: ASHRAE Climate Zone 4
University of Oklahoma
ARCH 5832: Introduction to Building Performance Analysis
BASELINE ENERGY MODEL
The baseline energy model is is a 10 story, 172,223 ft² office building in New York, NY. The adopted energy code in New York and used to evaluate the project is 2020 ECCNYS based on the 2018 IECC energy code. This building is in ASHRAE Climate Zone 4. The baseline model has an EUI of 44 kBtu/ft²/yr, with the heating load making up 25% of the building energy use and the cooling making up 12%.
CHANGES
ZONING
We made modifications to the zoning strategy by changing it from basic perimeter/core to one zone / room for all floors. It lowered the heating use from 25% to 23% but raised the cooling use from 12% to 13%. This had an effect on the EUI by lowering it 6% and the Annual Energy Cost by 5%.
SET POINT TEMPERATURE
Another change we made was to the temperature set points for the building in order to lower the overall energy use for heating and cooling. By changing the heating setpoint to 78 and the cooling setpoint to 68, we were able to drop the heating by 62,985 kWh per year and the cooling by 31,968 kWh per year. This created a 6% decrease in EUI and 4% decrease in Annual Energy Cost.
WINDOW TO WALL RATIO
Finally, we adjusted the window to wall ratio on our building design. By going from a .50 ratio to a .40 ratio, we were able to lower the kWh per year by 46,820. This created an EUI change of 4% and Annual Energy Cost change of 3%.
CONCLUSION
For this report, we first looked at each change individually compared to the baseline model. This allowed us to calculate the percentage of change for each modification separately, and then once we were satisfied with our findings, create a model that combined all changes. Through our selected modifications, we were able to make an overall EUI impact of 9% and and overall Annual Energy Cost impact of 6%.
