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You searched for: Author "Kui Shan" Remove constraint Author: "Kui Shan"
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1. Experimental study on the dynamics, quality and impacts of using variable-speed pumps in buildings for frequency regulation of smart power grids

Author:
Kui Shan,   et al.   ; Huilong Wang; Shengwei Wang;     Show all 3 Authors
Source:
Energy 2020 v.199 pp. 117406
ISSN:
0360-5442
Subject:
air conditioning; air temperature; buildings; heating systems; pumps; ventilation systems
Abstract:
... The increased generation of renewable power is challenging in terms of the power balance and reliability of power grids due to the intermittent nature of renewable sources. Heating, ventilation, and air-conditioning (HVAC) systems in buildings, at demand side, are promising candidates for providing frequency regulation. In this study, we systematically assessed the use of variable-speed pumps in H ...
DOI:
10.1016/j.energy.2020.117406

2. An online robust sequencing control strategy for identical chillers using a probabilistic approach concerning flow measurement uncertainties

Author:
Kui Shan,   et al.   ; Shaobo Sun; Shengwei Wang;     Show all 3 Authors
Source:
Applied energy 2022 v.317 pp. 119198
ISSN:
0306-2619
Subject:
Bayesian theory; Markov chain; decision making; energy balance; energy efficiency; models; probability analysis; uncertainty; water flow
Abstract:
... Chiller sequencing control is crucial to the reliable and energy-efficient operation of multiple-chiller plants. It should not only ensure an adequate supply of cooling capacity for buildings, but also make the chillers work efficiently. The measurement uncertainties cannot be avoided and have significant negative effects on the chiller sequencing control. To cope with the challenges and uncertain ...
DOI:
10.1016/j.apenergy.2022.119198

3. Adaptive full-range decoupled ventilation strategy and air-conditioning systems for cleanrooms and buildings requiring strict humidity control and their performance evaluation

Author:
Kui Shan,   et al.   ; Chaoqun Zhuang; Shengwei Wang;     Show all 3 Authors
Source:
Energy 2019 v.168 pp. 883-896
ISSN:
0360-5442
Subject:
air; air conditioning; buildings; cooling; dehumidification; economic analysis; energy conservation; energy efficiency; enthalpy; humidity; systems engineering; wastes; working conditions
Abstract:
... The air-conditioning systems in buildings and spaces, such as cleanrooms, requiring strict space humidity control are usually energy intensive, where significant energy wastes often occur due to improper system design and control. Dedicated outdoor air ventilation strategy, as the most recommended solution today, offers good energy performance by fully decoupling the cooling and dehumidification p ...
DOI:
10.1016/j.energy.2018.11.147

4. Controlling a large constant speed centrifugal chiller to provide grid frequency regulation: A validation based on onsite tests

Author:
Kui Shan,   et al.   ; Shengwei Wang; Chaoqun Zhuang;     Show all 3 Authors
Source:
Applied energy 2021 v.300 pp. 117359
ISSN:
0306-2619
Subject:
cooling; electrical equipment; electricity; energy; energy use and consumption; renewable energy sources; Maryland; New Jersey; Pennsylvania
Abstract:
... High penetration of intermittent renewables may cause safety and stability problems to the electricity grid. Building thermal loads could contribute to the grid stability in the era of renewable energy and smart grid, because they are high and flexible. This study proposes a model predictive control strategy to control a large constant speed centrifugal chiller to follow grid frequency regulation ...
DOI:
10.1016/j.apenergy.2021.117359

5. Hybrid renewable energy applications in zero-energy buildings and communities integrating battery and hydrogen vehicle storage

Author:
Kui Shan,   et al.   ; Jia Liu; Xi Chen; Hongxing Yang;     Show all 4 Authors
Source:
Applied energy 2021 v.290 pp. 116733
ISSN:
0306-2619
Subject:
batteries; carbon; energy; exports; feasibility studies; hydrogen; imports; renewable energy sources; stakeholders
Abstract:
... This study presents hybrid renewable energy systems integrated with stationary battery and mobile hydrogen vehicle storage for a zero-energy community consisting of campus, office and residential buildings based on practical energy use data and simulations. A time-of-use grid penalty cost model evaluating grid import and export during on-peak and off-peak periods is proposed to achieve the power g ...
DOI:
10.1016/j.apenergy.2021.116733

6. A risk-based robust optimal chiller sequencing control strategy for energy-efficient operation considering measurement uncertainties

Author:
Kui Shan,   et al.   ; Chaoqun Zhuang; Shengwei Wang;     Show all 3 Authors
Source:
Applied energy 2020 v.280 pp. 115983
ISSN:
0306-2619
Subject:
Bayesian theory; decision making; energy efficiency; risk
Abstract:
... Proper and reliable control of central chilling systems with multiple chillers is crucial to save energy and enhance energy efficiency. The conventional total-cooling-load-based chiller sequencing control strategies determine switching (on/off) thresholds according to building instantaneous cooling load and chiller maximum cooling capacity. However, due to the existence of measurement uncertaintie ...
DOI:
10.1016/j.apenergy.2020.115983

7. Probabilistic optimal design of cleanroom air-conditioning systems facilitating optimal ventilation control under uncertainties

Author:
Kui Shan,   et al.   ; Chaoqun Zhuang; Shengwei Wang;     Show all 3 Authors
Source:
Applied energy 2019 v.253 pp. 113576
ISSN:
0306-2619
Subject:
air conditioning; ataxia (disorder); buildings; economic performance; energy; factories; humidity; life cycle costing; microchip technology; semiconductors; systems engineering; temperature; uncertainty
Abstract:
... Buildings with spaces requiring strict temperature and humidity controls, such as pharmaceutical cleanrooms and semiconductor/microchip factories, have been growing very quickly in terms of total floor area and energy consumption. In such buildings, much of the energy is unnecessarily wasted due to the incoordination of system design and operation/control, especially under “off-design” and ever-ch ...
DOI:
10.1016/j.apenergy.2019.113576

8. A multi-timescale cold storage system within energy flexible buildings for power balance management of smart grids

Author:
Kui Shan,   et al.   ; Chengchu Yan; Fengling Wang; Yan Pan; Risto Kosonen;     Show all 5 Authors
Source:
Renewable energy 2020 v.161 pp. 626-634
ISSN:
0960-1481
Subject:
buildings; case studies; cold storage; energy; energy use and consumption; heat; renewable energy sources; storage time; water storage; China
Abstract:
... Energy storage is widely used in energy flexible buildings, which have great potential for relieving the power imbalance of electrical grids. However, most of the existing energy storage systems are designed for short-term storage, and only a few systems reported for long-term or multi-time scale storage. This paper introduces a new type of multi-timescale cold storage system consisted of a heat p ...
DOI:
10.1016/j.renene.2020.07.079

9. Model predictive control for thermal energy storage assisted large central cooling systems

Author:
Kui Shan,   et al.   ; Cheng Fan; Jiayuan Wang;     Show all 3 Authors
Source:
Energy 2019 v.179 pp. 916-927
ISSN:
0360-5442
Subject:
control methods; cooling systems; electric potential difference; energy efficiency; summer; thermal energy; winter
Abstract:
... Variable speed drivers (VSDs) are commonly used for enhancing energy efficiency in building central cooling systems. However, VSDs often consume about 4–8% of the converted energy. Moreover, the initial and maintenance costs of VSDs for extremely large and high voltage chillers could be extremely high. This study proposes to use thermal energy storage (TES) to enhance energy efficiency of extremel ...
DOI:
10.1016/j.energy.2019.04.178

10. Optimizing Nucleophilic Depolymerization of Proanthocyanidins in Grape Seeds to Dimeric Proanthocyanidin B1 or B2

Author:
Kui-Shan Wen,   et al.   ; Xiao Ruan; Jing Wang; Li Yang; Feng Wei; Ying-Xian Zhao; Qiang Wang;     Show all 7 Authors
Source:
Journal of agricultural and food chemistry 2019 v.67 no.21 pp. 5978-5988
ISSN:
1520-5118
Subject:
Lewis bases; depolymerization; economic valuation; grape seeds; hydrochloric acid; polymers; proanthocyanidins; temperature
Abstract:
... Depolymerization of polymeric proanthocyanidins (PPCs) in grape seeds into oligomeric proanthocyanidins (OPCs), especially the dimers, has important academic significance and practical value. Reaction conditions including nucleophilic reagent/PPC mass ratio, HCl concentration, reaction time, and temperature were systematically optimized by central composite design to maximize the yield of the dime ...
DOI:
10.1021/acs.jafc.9b01188

11. A model-based control strategy to recover cooling energy from thermal mass in commercial buildings

Author:
Kui Shan,   et al.   ; Jiayuan Wang; Maomao Hu; Dian-ce Gao;     Show all 4 Authors
Source:
Energy 2019 v.172 pp. 958-967
ISSN:
0360-5442
Subject:
air conditioning; air temperature; algorithms; buildings; energy recovery; furniture; models; prediction; thermal energy; China
Abstract:
... Building structures and furniture have the capability of storing thermal energy and therefore could be called building thermal mass. In commercial buildings, room conditions remain in thermal comfort zone for a while after the end of office hours when the air-conditioning systems are tuned off. It is possible to recover the stored cooling energy from building thermal mass in commercial buildings. ...
DOI:
10.1016/j.energy.2019.02.045

12. Energy efficient design and control of cleanroom environment control systems in subtropical regions – A comparative analysis and on-site validation

Author:
Kui Shan,   et al.   ; Shengwei Wang;     Show all 2 Author
Source:
Applied energy 2017 v.204 pp. 582-595
ISSN:
0306-2619
Subject:
air conditioning; computer software; energy efficiency; relative humidity; subtropics; temperature; China
Abstract:
... Compared with spaces air-conditioned for thermal comfort, cleanrooms often have special requirements on dry bulb temperature, relative humidity and particle concentrations. It is a challenging task to achieve those requirements with minimum energy consumption, especially when different parameters interfere with each other. A significant amount of energy would be wasted if the system is not properl ...
DOI:
10.1016/j.apenergy.2017.07.050

13. Optimal control strategy of central air-conditioning systems of buildings at morning start period for enhanced energy efficiency and peak demand limiting

Author:
Kui Shan,   et al.   ; Rui Tang; Shengwei Wang; Howard Cheung;     Show all 4 Authors
Source:
Energy 2018 v.151 pp. 771-781
ISSN:
0360-5442
Subject:
air conditioning; buildings; case studies; energy efficiency; precooling; pumps; wastes; working conditions
Abstract:
... Air-conditioning systems in commercial buildings are usually switched on before office hour to precool buildings to create an acceptable working environment at the beginning of the office hour in cooling seasons. However, due to high cooling demand during morning start period particularly in hot seasons, often much higher than the capacity of cooling supply, the feedback control strategies in air- ...
DOI:
10.1016/j.energy.2018.03.032

14. Discovering gradual patterns in building operations for improving building energy efficiency

Author:
Kui Shan,   et al.   ; Cheng Fan; Yongjun Sun; Fu Xiao; Jiayuan Wang;     Show all 5 Authors
Source:
Applied energy 2018 v.224 pp. 116-123
ISSN:
0306-2619
Subject:
case studies; data analysis; energy efficiency; information technology; monitoring
Abstract:
... The development of information technologies has enabled real-time monitoring and controls over building operations. Massive amounts of building operational data are being collected and available for knowledge discovery. Advanced data analytics are urgently needed to fully realize the potentials of big building operational data in enhancing building energy efficiency. The rapid development of data ...
DOI:
10.1016/j.apenergy.2018.04.118

15. In-situ implementation and evaluation of an online robust pump speed control strategy for avoiding low delta-T syndrome in complex chilled water systems of high-rise buildings

Author:
Kui Shan,   et al.   ; Dian-ce Gao; Shengwei Wang;     Show all 3 Authors
Source:
Applied energy 2016 v.171 pp. 541-554
ISSN:
0306-2619
Subject:
energy; energy conservation; pumps; temperature
Abstract:
... The low delta-T syndrome is one of the major faults that affect the operation and energy performance of the chilled water systems in practice, particularly for the complex chilled water systems. Low delta-T syndrome refers to the situation where the measured mean temperature difference of the overall terminal air-handling units is much lower than the expected normal value. The conventional pump sp ...
DOI:
10.1016/j.apenergy.2016.03.077

16. Design optimization and optimal control of grid-connected and standalone nearly/net zero energy buildings

Author:
Kui Shan,   et al.   ; Yuehong Lu; Shengwei Wang;     Show all 3 Authors
Source:
Applied energy 2015 v.155 pp. 463-477
ISSN:
0306-2619
Subject:
buildings; case studies; climate; electrical equipment; energy; energy conservation; system optimization; uncertainty
Abstract:
... Nearly/net zero energy buildings (nZEBs) have attracted increasing attention particularly when high and complex performance is required in terms of energy-saving, indoor thermal comfort, environmental friendliness and grid-friendliness. However, there is no exact approach at present for the design and control of buildings to achieve the nearly/net zero energy target. This is mainly due to the comp ...
DOI:
10.1016/j.apenergy.2015.06.007

17. A system-level fault detection and diagnosis method for low delta-T syndrome in the complex HVAC systems

Author:
Kui Shan,   et al.   ; Dian-ce Gao; Shengwei Wang; Chengchu Yan;     Show all 4 Authors
Source:
Applied energy 2016 v.164 pp. 1028-1038
ISSN:
0306-2619
Subject:
air conditioning; energy; health status; heat exchangers; models; uncertainty
Abstract:
... Low delta-T syndrome widely exists in the existing air-conditioning systems and results in increased energy consumption. This paper presents a system-level fault detection and diagnosis method (FDD) to detect and diagnose the low delta-T syndrome resulted from the performance degradation of AHUs system and plate heat exchanger system in a complex HVAC system. Performance indices are introduced to ...
DOI:
10.1016/j.apenergy.2015.02.025

18. Impacts of renewable energy system design inputs on the performance robustness of net zero energy buildings

Author:
Kui Shan,   et al.   ; Yuehong Lu; Shengwei Wang; Chengchu Yan;     Show all 4 Authors
Source:
Energy 2015 v.93 pp. 1595-1606
ISSN:
0360-5442
Subject:
algorithms; biodiesel; buildings; carbon dioxide; energy; greenhouse gas emissions; systems engineering; uncertainty; wind speed
Abstract:
... Due to the intermittent and uncontrollable nature of renewable energy resources, the performance of nZEB (net zero energy buildings) may suffer a great degree of uncertainties. In this study, a GA (genetic algorithm) optimization approach is employed to search optimal sizes of four design options for a net zero energy building. Then, sensitivity analysis is conducted on an optimized system (photov ...
DOI:
10.1016/j.energy.2015.10.034