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Energy efficient thermal comfort in open-plan office buildings
Srinarayana Nagarathinam
Published in Elsevier Ltd
2017
Volume: 139
   
Pages: 476 - 486
Abstract
The effect of spatial variations in mean radiant temperature and occupancy on HVAC energy and occupant thermal comfort is studied in an open-plan office space with multiple AHUs. A predictive control method is proposed that arrives at optimum temperature set-point vector by solving an optimization problem, which minimizes HVAC energy consumption subject to acceptable thermal comfort and adequate outside air intake. The optimum temperature set-point vector is used in a PID controller that modulates the AHU fan speed. The proposed control is evaluated on occupancy traces observed in an open-plan space and compared with static set-points based PID control strategies. Normally PID control operates with a dead-band around the static set-point and the AHU fan speed is adjusted only when return air temperature is outside the dead-band. The proposed control has a dynamic set-point and hence the AHU speeds are adjusted at much finer time steps than the normal control. The occupancy traces are classified into densely and sparsely occupied days. Across all days, the proposed control achieves an average additional savings of 15% over a PID control that assumes uniform spatial occupancy distribution in AHU control and 12% over a PID based strategy that uses actual spatial occupancy information. © 2017 Elsevier B.V.
About the journal
JournalData powered by TypesetEnergy and Buildings
PublisherData powered by TypesetElsevier Ltd
ISSN03787788
Open AccessNo
Concepts (16)
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    AIR INTAKES
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    Energy efficiency
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    Energy utilization
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    Model predictive control
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    OFFICE BUILDINGS
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    Optimization
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    Thermal comfort
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    HVAC ENERGY
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    MEAN RADIANT TEMPERATURE
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    OPEN-PLAN OFFICES
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    Optimization problems
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    Optimum temperature
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    PREDICTIVE CONTROL METHODS
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    RETURN-AIR TEMPERATURES
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    Setpoints
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    Three term control systems