Using measured equipment load profiles to 'right-size' HVACsystems and reduce energy use in laboratory buildings (Pt. 2) Page: 9 of 14
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These profiles are indicated in figure 7. The total building equipment load in any given hour is
identical for both simulations, as are all other parameters. Thus, energy impacts of load variation
can be isolated and analyzed.
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
Z O N E 5
Figure 6. Simulation model used to analyze the energy impact of load variation. Boundary conditions for
all zones were set to be adiabatic to eliminate envelope-related variations in loads for each zone. Zone 3 is
about 12.5% of the total area.
Equipment Load Profiles for "Uniform" and "Variation" Cases
Hour of weekday
Figure 7. Equipment load profiles used for simulation with load variation and simulation with uniform
loads. "Variation-High Intensity" and "Variation-Typical" represent high-intensity and typical space load
profiles in the simulation with load variation. "Uniform" represents the area-weighted load profile in all
spaces for the simulation with uniform loads. (The total equipment loads for the building in each
simulation are identical.)
The basecase model has a VAV system with hot-water reheat, and a water-cooled chiller plant
and natural gas boiler. HVAC component and system efficiencies were set to be consistent with
good practice. None of the HVAC component and system parameters were varied in the
- Variation-High Intensity
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Mathew, Paul; Greenberg, Steve; Frenze, David; Morehead, Michael; Sartor, Dale & Starr, William. Using measured equipment load profiles to 'right-size' HVACsystems and reduce energy use in laboratory buildings (Pt. 2), article, June 29, 2005; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc901308/m1/9/: accessed June 17, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.