Search Results - "Braun, James"

MPC solution for optimal load shifting for buildings with ON/OFF staged packaged units: Experimental demonstration, and lessons learned by Kim, Donghun, Braun, James E.

“…•Addressed a real-world challenge for load-shifting multiple ON/OFF staged units.•Presented a unique MPC that shifts load while eliminating undesired…”
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Development, implementation, and evaluation of a fault detection and diagnostics system based on integrated virtual sensors and fault impact models by Kim, Woohyun, Braun, James E.

“…The primary goal of this work was to develop, demonstrate, and evaluate a fault detection and diagnostics (FDD) system that incorporates integrated virtual…”
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Laboratory-based assessment of HVAC equipment for power grid frequency regulation: Methods, regulation performance, economics, indoor comfort and energy efficiency by Cai, Jie, Braun, James E.

“…Real-time power supply and demand balances are critical to ensure stable power frequency and quality power services. However, the growing integration of…”
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Development, implementation and performance of a model predictive controller for packaged air conditioners in small and medium-sized commercial building applications by Kim, Donghun, Braun, James E.

“…•A complete and low cost MPC solution for small/medium sized commercial buildings was developed.•Handling unmeasured building disturbances for modeling and…”
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A regulation capacity reset strategy for HVAC frequency regulation control by Cai, Jie, Braun, James E.

“…The power grid has seen record demand for frequency regulation capacity in recent years due to the increased employment of renewable energy resources…”
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Energy savings potential of passive chilled beams vs air systems in various US climatic zones with different system configurations by Kim, Janghyun, Tzempelikos, Athanasios, Braun, James E.

“…The energy savings potential of passive chilled beams in various climatic zones is analyzed in this study. A passive chilled beam model, developed based on…”
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A 2-D reduced dynamic model for a shell-and-tube based metal hydride reactor for geometry and operation condition optimal design by Pan, Chunjian, Ziviani, Davide, Braun, James E.

“…•A fast 2-D reduced model for a shell-and-tube based metal hydride reactor.•Coarse mesh is employed as a reduced model basis.•Data-driven factors are employed…”
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A general multi-agent control approach for building energy system optimization by Cai, Jie, Kim, Donghun, Jaramillo, Rita, Braun, James E., Hu, Jianghai

“…•A multi-agent control approach is proposed for optimal management of building energy systems.•A multi-agent control framework is developed to reduce the…”
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Proper orthogonal decomposition for reduced order dynamic modeling of vapor compression systems by Ma, Jiacheng, Kim, Donghun, Braun, James E.

“…•Developed a nonlinear model order reduction framework to generate reduced order heat exchanger models.•Applied the proposed model order reduction scheme to a…”
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System identification for building thermal systems under the presence of unmeasured disturbances in closed loop operation: Lumped disturbance modeling approach by Kim, Donghun, Cai, Jie, Ariyur, Kartik B., Braun, James E.

“…Identification approaches applied to semi-physical thermal network structures, so called gray-box modeling approaches, are popular in building science for…”
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Performance evaluation of a vapor-compression-cycle based heat pump system for a lunar habitat under the impact of dust deposits on the coupled radiators by Pan, Chunjian, Ziviani, Davide, Braun, James E.

“…Space exploration is gaining new momentum. A near-term goal set by NASA is to return humans to the Moon and establish a sustainable presence on the lunar…”
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Evaluation of the impacts of refrigerant charge on air conditioner and heat pump performance by Kim, Woohyun, Braun, James E.

“…The paper provides results that show the impact of charge level on capacity and efficiency for several units tested in the laboratory. To evaluate the…”
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Theoretical analysis of dynamic characteristics in linear compressors by Zhang, Xinye, Ziviani, Davide, Braun, James E., Groll, Eckhard A.

“…Linear compressor technology is characterized by the absence of a crank mechanism, which has gained increasing attention in vapor compression systems due to…”
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Thermal energy storage based (TES-based) reverse cycle defrosting control strategy optimization for a cascade air source heat pump by Qu, Minglu, Lu, Mingqi, Li, Zhao, Song, Xiaojun, Chen, Jianbo, Ziviani, Davide, Braun, James E.

“…•Experiments were conducted to optimize the control of TES defrosting for CASHPs.•To regulate heat distribution, the LSC and HSC refrigerant flow rates were…”
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Development and evaluation of a generalized rule-based control strategy for residential ice storage systems by Tam, Aaron, Ziviani, Davide, Braun, James E., Jain, Neera

“…In recent years, variable electricity pricing has become available to residential consumers to incentivize demand reductions during midday peak hours. Thermal…”
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Techno-economic analysis of metal-hydride energy storage to enable year-round load-shifting for residential heat pumps by Krane, Patrick, Ziviani, Davide, Braun, James E., Jain, Neera, Marconnet, Amy

“…•Metal hydrides show potential for year-round energy storage with residential HVAC.•Hydride storage can shift both heating and cooling loads away from on-peak…”
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Assessments of variable-speed equipment for packaged rooftop units (RTUs) in the United States by Cai, Jie, Braun, James E.

“…Packaged air-conditioning systems, such as rooftop units (RTUs), are widely used in small commercial buildings in the United States. Although new regulations…”
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Automated laboratory load-based testing and performance rating of residential cooling equipment by Cheng, Li, Dhillon, Parveen, Horton, W. Travis, Braun, James E.

“…•A load-based testing and performance rating approach for residential cooling equipment is developed.•Test equipment with its native controls behaves as if it…”
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Assessments of demand response potential in small commercial buildings across the United States by Cai, Jie, Braun, James E.

“…Buildings are responsible for more than 73% of the total electricity usage in the United States and have a significant contribution to peak electrical demand…”
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A methodology for mapping the performance of variable-speed residential cooling equipment using load-based testing by Cheng, Li, Braun, James E., Horton, W. Travis

“…A load-based testing methodology has recently been developed for laboratory testing of residential cooling equipment with its integrated controls that employs…”
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