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A platform for research: civil engineering, architecture and urbanism
Near-optimal transition between temperature setpoints for peak load reduction in small buildings
Highlights The problem of load reduction when changing temperature setpoints is investigated. An optimal curve found with an optimization algorithm is used as a reference. A near-optimal path is drawn by numerically finding an optimal “curvature” value. A generalization using two values (time constant and transition time) is proposed. Properties of the near-optimal curve and a potential application are discussed.
Abstract This paper addresses the problem of the transition between two constant temperature setpoints in small buildings. The proposed method consists of finding a trajectory resulting in significant reduction in the peak thermal load during the transition period. This trajectory should reach and maintain the new setpoint without a subsequent “load rebound”. An optimal transition path, which serves as a benchmark, is obtained through an optimization algorithm. A trajectory that can be adjusted with a single “curvature” parameter is then proposed. The value of the curvature parameter yielding the smallest peak is found numerically and a “near-optimal curve” is thus achieved. The properties of this curve are investigated. For the particular case examined, the near-optimal curve yields a peak load about 8% smaller than that corresponding to a linear ramp. A general expression for the curvature parameter of the near-optimal curve is obtained by performing parametric runs. The general formulation is then given as a function of two parameters: (a) the building time constant; (b) and the user-required transition time. The proposed method, suitable for a programmable thermostat, allows achieving considerable peak reductions in an inexpensive and practical manner, without requiring an optimization for each particular case.
Near-optimal transition between temperature setpoints for peak load reduction in small buildings
Highlights The problem of load reduction when changing temperature setpoints is investigated. An optimal curve found with an optimization algorithm is used as a reference. A near-optimal path is drawn by numerically finding an optimal “curvature” value. A generalization using two values (time constant and transition time) is proposed. Properties of the near-optimal curve and a potential application are discussed.
Abstract This paper addresses the problem of the transition between two constant temperature setpoints in small buildings. The proposed method consists of finding a trajectory resulting in significant reduction in the peak thermal load during the transition period. This trajectory should reach and maintain the new setpoint without a subsequent “load rebound”. An optimal transition path, which serves as a benchmark, is obtained through an optimization algorithm. A trajectory that can be adjusted with a single “curvature” parameter is then proposed. The value of the curvature parameter yielding the smallest peak is found numerically and a “near-optimal curve” is thus achieved. The properties of this curve are investigated. For the particular case examined, the near-optimal curve yields a peak load about 8% smaller than that corresponding to a linear ramp. A general expression for the curvature parameter of the near-optimal curve is obtained by performing parametric runs. The general formulation is then given as a function of two parameters: (a) the building time constant; (b) and the user-required transition time. The proposed method, suitable for a programmable thermostat, allows achieving considerable peak reductions in an inexpensive and practical manner, without requiring an optimization for each particular case.
Near-optimal transition between temperature setpoints for peak load reduction in small buildings
Candanedo, José A. (author) / Dehkordi, Vahid R. (author) / Saberi-Derakhtenjani, Ali (author) / Athienitis, Andreas K. (author)
Energy and Buildings ; 87 ; 123-133
2014-11-06
11 pages
Article (Journal)
Electronic Resource
English
Near-optimal transition between temperature setpoints for peak load reduction in small buildings
| Online Contents | 2015
LOFT Instrumentation Setpoints
| NTIS | 1978
LOFT Instrumentation Setpoints. Revision 1
| NTIS | 1978