22 results on '"Zhang, Rongpeng"'
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2. Phenomenon of courtyards being roofed and its significance for building energy efficiency
- Author
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Wen, Baohua, Yang, Qingxin, Xu, Feng, Zhou, Jin, and Zhang, Rongpeng
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- 2023
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3. HVAC energy savings, thermal comfort and air quality for occupant-centric control through a side-by-side experimental study
- Author
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Kong, Meng, Dong, Bing, Zhang, Rongpeng, and O'Neill, Zheng
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- 2022
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4. Detecting Internal Defects in FRP-Reinforced Concrete Structures through the Integration of Infrared Thermography and Deep Learning.
- Author
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Pan, Pengfei, Zhang, Rongpeng, Zhang, Yi, and Li, Hongbo
- Abstract
This study represents a significant advancement in structural health monitoring by integrating infrared thermography (IRT) with cutting-edge deep learning techniques, specifically through the use of the Mask R-CNN neural network. This approach targets the precise detection and segmentation of hidden defects within the interfacial layers of Fiber-Reinforced Polymer (FRP)-reinforced concrete structures. Employing a dual RGB and thermal camera setup, we captured and meticulously aligned image data, which were then annotated for semantic segmentation to train the deep learning model. The fusion of the RGB and thermal imaging significantly enhanced the model's capabilities, achieving an average accuracy of 96.28% across a 5-fold cross-validation. The model demonstrated robust performance, consistently identifying true negatives with an average specificity of 96.78% and maintaining high precision at 96.42% in accurately delineating damaged areas. It also showed a high recall rate of 96.91%, effectively recognizing almost all actual cases of damage, which is crucial for the maintenance of structural integrity. The balanced precision and recall culminated in an average F1-score of 96.78%, highlighting the model's effectiveness in comprehensive damage assessment. Overall, this synergistic approach of combining IRT and deep learning provides a powerful tool for the automated inspection and preservation of critical infrastructure components. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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5. Assessing Spatial Heterogeneity in Urban Park Vitality for a Sustainable Built Environment: A Case Study of Changsha.
- Author
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Qin, Liwei, Zong, Wenke, Peng, Kai, and Zhang, Rongpeng
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BUILT environment ,PUBLIC spaces ,URBAN parks ,URBAN growth ,SUSTAINABLE urban development ,URBAN planning - Abstract
In the realm of sustainable city development, evaluating the spatial vitality of urban green spaces (UGS) has become increasingly pivotal for assessing public space quality. This study delves into the spatial heterogeneity of park vitality across diverse urban landscapes at a city scale, addressing limitations inherent in conventional approaches to understanding the dynamics of park vitality. Leveraging geotagged check-in data from 65 parks in the study case of Changsha City, a quantitative analysis was undertaken to assess spatial vitality. The investigation incorporated data concerning internal and external factors influencing park vitality, employing the Multi-scale Geographically Weighted Regression (MGWR) model to dissect nuanced spatial heterogeneity. The research uncovers notable spatial discrepancies in factors influencing park vitality across diverse urban areas, emphasizing the reliance on adjacent residential communities and internal commercial amenities provision. These dependencies correspond with economic development differences among urban locales, revealing distinct geographic trends. This study has a novel perspective and methodology for investigating urban park vitality, providing significant insights for urban green space planning and management. It emphasizes the necessity of acknowledging spatial diversity in urban park planning and design by incorporating the distinct socio-economic characteristics of each urban zone, which is crucial for both urban planners and policymakers. [ABSTRACT FROM AUTHOR]
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- 2024
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6. The Efficacy of a Multimodal Bedroom-Based 'Smart' Alarm System on Mitigating the Effects of Sleep Inertia.
- Author
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Campanella, Carolina, Byun, Kunjoon, Senerat, Araliya, Li, Linhao, Zhang, Rongpeng, Aristizabal, Sara, Porter, Paige, and Bauer, Brent
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MORNINGNESS-Eveningness Questionnaire ,SLEEP ,ALARM clocks ,FALSE alarms ,MOTOR ability testing ,CHRONOTYPE - Abstract
Previous work has demonstrated the modest impact of environmental interventions that manipulate lighting, sound, or temperature on sleep inertia symptoms. The current study sought to expand on previous work and measure the impact of a multimodal intervention that collectively manipulated light, sound, and ambient temperature on sleep inertia. Participants slept in the lab for four nights and were awoken each morning by either a traditional alarm clock or the multimodal intervention. Feelings of sleep inertia were measured each morning through Psychomotor Vigilance Test (PVT) assessments and ratings of sleepiness and mood at five time-points. While there was little overall impact of the intervention, the participant's chronotype and the length of the lighting exposure on intervention mornings both influenced sleep inertia symptoms. Moderate evening types who received a shorter lighting exposure (≤15 min) demonstrated more lapses relative to the control condition, whereas intermediate types exhibited a better response speed and fewer lapses. Conversely, moderate evening types who experienced a longer light exposure (>15 min) during the intervention exhibited fewer false alarms over time. The results suggest that the length of the environmental intervention may play a role in mitigating feelings of sleep inertia, particularly for groups who might exhibit stronger feelings of sleep inertia, including evening types. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
7. High-Density Communities and Infectious Disease Vulnerability: A Built Environment Perspective for Sustainable Health Development.
- Author
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Hu, Yue, Lin, Ziyi, Jiao, Sheng, and Zhang, Rongpeng
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BUILT environment ,COMMUNICABLE diseases ,INFECTIOUS disease transmission ,SUSTAINABLE development ,COVID-19 pandemic - Abstract
High-density communities have proliferated globally during rapid urbanization. They are characterized by a high population density and limited per capita public spaces, making them susceptible to infectious disease risks. The impact of infectious diseases in these communities, as evident during the COVID-19 pandemic, underscores their vulnerabilities. Yet, research on disease prevention in high-density areas remains limited. This study aims to investigate the relationship between the built environment and the transmission of infectious diseases in high-density urban communities, with a particular focus on the lessons learned during the COVID-19 pandemic. Utilizing Shenzhen city as a case study, this study collected data on the built environment and epidemic trends and involved a generalized linear regression analysis, aiming to understand the key built environment factors that affect epidemic spread in high-density areas. The results from the study revealed that high-density communities experience higher rates of infectious disease transmission compared to their medium- to low-density counterparts. The significant factors identified include land use mixture and walkability, with land use mixture showing the most substantial impact on infection rates. Through a combination of qualitative analysis and empirical research, we constructed a conceptual framework linking containment measures, non-pharmaceutical interventions, and the built environment. The findings emphasize the significance to focus on the health development of high-density communities and offer valuable insights for tailored urban planning and built environment design. These insights are crucial for promoting the healthy and sustainable transformation of existing high-density communities. [ABSTRACT FROM AUTHOR]
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- 2024
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8. A novel Variable Refrigerant Flow (VRF) heat recovery system model: Development and validation
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Zhang, Rongpeng, Sun, Kaiyu, Hong, Tianzhen, Yura, Yoshinori, and Hinokuma, Ryohei
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- 2018
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9. Modeling of HVAC operational faults in building performance simulation
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Zhang, Rongpeng and Hong, Tianzhen
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- 2017
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10. The impact of evaporation from porous tile on roof thermal performance: A case study of Guangzhou’s climatic conditions
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Zhang, Lei, Zhang, Rongpeng, Zhang, Yu, Hong, Tianzhen, Meng, Qinglin, and Feng, Yanshan
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- 2017
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11. Enhanced Operation of Ice Storage System for Peak Load Management in Shopping Malls across Diverse Climate Zones.
- Author
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Su, Fanghan, Wang, Zhiyuan, Yuan, Yue, Song, Chengcheng, Zeng, Kejun, Chen, Yixing, and Zhang, Rongpeng
- Abstract
There exists a notable research gap concerning the application of ice storage systems in shopping mall settings at the urban scale. The characteristics of large pedestrian flow, high energy consumption, and high peak loads in shopping malls make their advantages in energy conservation. This study researches sustainable cooling solutions by undertaking an economic analysis of the ice storage systems within shopping malls across 11 distinct cities, each system operating under varied electricity pricing frameworks. The methodology begins with creating baseline mall models using AutoBPS and refining them with OpenStudio. Before starting to adjust the model, measured data were used to verify the accuracy of the baseline model, the coefficient of variation of the root mean square error (CVRMSE) and normalized mean bias error (NMBE) metrics were calculated for the model energy consumption, with CVRMSE values of 8.6% and NMBE values of 1.57% for the electricity consumption, while the metrics for the gas consumption were 12.9% and 1.24%, respectively. The study extends its inquiry to encompass comprehensive economic evaluations based on the unique electricity pricing of each city. This rigorous assessment discerns the relationship between capacity, operational strategies, and economic performance. Particularly striking are the so-called peak-shaving and valley-filling effects verified in regions characterized by lower latitudes and substantial cooling loads. The interaction between ice storage capacity and operational schedules significantly influences both economic viability and cooling efficiency. Based on the temporal dynamics of time-of-use (TOU) power pricing, a finely calibrated operational schedule for the ice storage system is proposed. This operational strategy entails charging during periods of reduced electricity pricing to undertake cooling loads during peak electricity pricing intervals, culminating in substantial reductions in electricity charges of buildings. Moreover, the strategic reallocation of energy, characterized by a reduced chiller capacity and a corresponding elevation in ice storage system capacity, augments cooling efficiency and diminishes cooling-related electricity expenses. This study offers valuable insights for optimizing and deploying ice storage systems in diverse climatic regions, particularly for shopping malls. As a guiding reference, this paper provides stakeholders with a framework to reasonably apply and adjust ice storage systems, ushering in an era of energy-efficient and environmentally conscious cooling solutions tailored to shopping mall environments. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Retrofit Analysis of City-Scale Residential Buildings in the Hot Summer and Cold Winter Climate Zone.
- Author
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Ji, Yanfei, Li, Guangchen, Su, Fanghan, Chen, Yixing, and Zhang, Rongpeng
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HOT weather conditions ,ENERGY consumption of buildings ,DWELLINGS ,DAYLIGHT ,NET present value ,ENERGY conservation ,SUMMER - Abstract
The rising energy consumption in residential buildings within the hot summer and cold winter (HSCW) climate zone, driven by occupants' pursuit of improved thermal comfort, necessitates effective energy conservation measures. This study established urban building energy models for 32,145 residential buildings in Changsha City, China, and conducted a comprehensive retrofit analysis of seven energy conservation measures (ECMs). Additionally, the study assessed the impact of residents' conscious energy-saving behaviors concerning air conditioner (AC) control. The research commenced by creating six baseline models representative of the diverse building stock. Identifying seven commonly used ECMs, the study examined the potential of each measure for enhancing energy efficiency. To facilitate the analysis, a dedicated toolkit, AutoBPS-Retrofit, was developed to efficiently modify the baseline model for each ECM. Furthermore, the investigation delved into the investment cost of implementing the ECMs and evaluated their simple payback year (PBP) and net present value (NPV). The results demonstrate that tailored retrofit plans are essential when addressing envelope improvements, varying according to building types and ages. Retrofits targeting lighting systems offer both promising energy savings and favorable economic viability, albeit subject to residents' preferences. Alternatively, upgrading the AC systems emerges as the most energy-efficient approach, yet the economic assessment raises concerns. The study's findings offer practical insights for governments seeking to establish effective carbon reduction goals and policies. Moreover, the research can assist energy-saving institutions, real-estate companies, and stakeholders involved in renovation projects by offering guidance in making informed decisions to enhance energy efficiency in city-scale residential buildings. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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13. Development and validation of a new variable refrigerant flow system model in EnergyPlus
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Hong, Tianzhen, Sun, Kaiyu, Zhang, Rongpeng, Hinokuma, Ryohei, Kasahara, Shinichi, and Yura, Yoshinori
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- 2016
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14. Dynamic optimization based integrated operation strategy design for passive cooling ventilation and active building air conditioning
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Zhang, Rongpeng, Nie, Yisu, Lam, Khee Poh, and Biegler, Lorenz T.
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- 2014
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15. Design of experiment-based tolerance synthesis for a lock-or-release mechanism of the Chinese Space Station Microgravity Platform
- Author
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Lu Zhang, Haitao Luo, Jinguo Liu, Guangbo Hao, Zhang Rongpeng, Yuwang Liu, and Ding Jian
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Fluid Flow and Transfer Processes ,Record locking ,Tolerance synthesis ,Computer science ,Mechanical Engineering ,Design of experiments ,Monte Carlo method ,CAS ,Kinematics ,Space (mathematics) ,Industrial and Manufacturing Engineering ,Number-theory method (NTM) ,Mechanism (engineering) ,Chinese Space Station Microgravity Platform (SSMP) ,Mechanics of Materials ,Control and Systems Engineering ,Position (vector) ,Control theory ,Experiment-based ,lcsh:TA401-492 ,lcsh:Materials of engineering and construction. Mechanics of materials ,Civil and Structural Engineering ,Lock-or-release mechanism - Abstract
This paper deals with the tolerance synthesis with the application for a typical Lock-or-Release (L/R) mechanism, used for Chinese Space Station Microgravity Platform (SSMP). The L/R mechanism is utilized to lock the SSMP maintaining space position during the launching stage, and to release the SSMP automatically during on-orbit stage. Manufacturing accuracy of L/R mechanism presents direct influence on its kinematic and dynamic behaviors. Tolerance synthesis can provide a reasonable assignment of tolerance, satisfying the critical assembly criteria while lowering manufacturing complexity. In this paper, based on the number-theory method (NTM), a Halton-set based Monte Carlo (MC) simulation is introduced in the accuracy model of the L/R mechanism, aiming at improving analytical precision and efficiency for tolerance synthesis. A design of experiment (DOE) based tolerance synthesis approach is proposed. With initial tolerance determined by capacity, sensitivities of different tolerance factors are generated through the first DOE stage, and then applied to determine feasible tolerance levels. The final tolerance assignments, like points scatted in high-dimensioned space with inherent uniformity, are then produced through uniform DOE in the second stage. Result shows that the majority of feasible tolerance assignments generated have more relaxed tolerance, which can facilitate the manufacturing process.
- Published
- 2019
16. Modeling and Simulation of Operational Faults of HVAC Systems Using Energyplus
- Author
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Zhang, Rongpeng and Hong, Tianzhen
- Abstract
HVAC operations play a significant role among various driving factors to improve energy performance of buildings. Extensive researches have been conducted on the design efficiencies and control strategies of HVAC system, but very few focused on the impacts of its operational faults on the building energy efficiency. Modeling and simulation of operational faults can lead to better understandings of the fault impacts and thus support decision making of timely fault corrections which can further benefit the efficient system operation, improve the indoor thermal comfort, and prolong the equipment service life. Fault modeling is also critical to achieve more accurate and reliable model calibrations. This paper introduces the modeling and simulation of operational faults using EnergyPlus, a comprehensive whole building performance simulation tool. The paper discusses the challenges of operational fault modeling, and compares three approaches to simulate operational faults using EnergyPlus. The paper also introduces the latest development of native fault objects within EnergyPlus. As an example, EnergyPlus version 8.4 is used to investigate the impacts of the integrated thermostat and humidistat faults in a typical office building across several U.S. climate zones. The results demonstrate that the faults create significant impacts on the building energy performance as well as occupant thermal comfort. At last, the paper introduces the future development plan of EnergyPlus for the further improvement of its fault modeling capability.
- Published
- 2016
17. Development and Validation of Demand Response Quick Assessment Tool for Refrigerated Warehouses in California
- Author
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Yin, Rongxin, Aghajanzadeh, Arian, Zhang, Rongpeng, McKane, Aimee, Therkelsen, Peter, and Hong, Tianzhen
- Abstract
The goal of this project was to develop a Demand Response Quick Assessment Tool for Refrigerated Warehouses (DRQAT-RW) that can make accurate recommendations about Energy Efficiency (EE) and Demand Response (DR) potential in individual facilities. The objective of this tool is to provide a reliable way for simulating the operations of individual refrigerated warehouse facilities. This report discusses EE measures, DR considerations, and load shed or shift strategies relevant to refrigerated warehouses. In addition, the EnergyPlus model used as the simulation engine of the tool is described in detail. The report also analyses the measured data from an actual cooler facility in Southern California to verify the simulation results of the tool. DRQAT-RW was tested and validated at an actual cooler facility in southern California. An analysis on the measured and simulated space temperature resulted in acceptable tolerance values suggesting that even without model calibration DRQAT-RW’s simulation engine is capable of predicting accurate space temperature. In addition the model accurately predicted 1.5°F temperature increase due to a DR event at the test facility. The predicted temperature rise precisely represents the facility’s behavior during an actual event during which 9 probes collected real-time space temperature. The estimated demand reduction during the two hour DR event is 157 kW, which is very close to the measured load shed based on the baseline days of 3/17/2015 and 3/18/2015. It was found that the compressor load had large fluctuations before and after the DR test day. Using the average demand of all baseline days, the simulated load shed from compressor load is 20% higher than the measured on the DR test day, which is still within the acceptable model tolerances.
- Published
- 2015
18. Design of experiment-based tolerance synthesis for a lock-or-release mechanism of the Chinese Space Station Microgravity Platform.
- Author
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Ding, Jian, Liu, Jinguo, Zhang, Lu, Luo, Haitao, Zhang, Rongpeng, Hao, Guangbo, and Liu, Yuwang
- Subjects
SPACE stations ,REDUCED gravity environments ,MANUFACTURING processes ,EXPERIMENTAL design - Abstract
This paper deals with the tolerance synthesis with the application for a typical Lock-or-Release (L/R) mechanism, used for Chinese Space Station Microgravity Platform (SSMP). The L/R mechanism is utilized to lock the SSMP maintaining space position during the launching stage, and to release the SSMP automatically during on-orbit stage. Manufacturing accuracy of L/R mechanism presents direct influence on its kinematic and dynamic behaviors. Tolerance synthesis can provide a reasonable assignment of tolerance, satisfying the critical assembly criteria while lowering manufacturing complexity. In this paper, based on the number-theory method (NTM), a Halton-set based Monte Carlo (MC) simulation is introduced in the accuracy model of the L/R mechanism, aiming at improving analytical precision and efficiency for tolerance synthesis. A design of experiment (DOE) based tolerance synthesis approach is proposed. With initial tolerance determined by capacity, sensitivities of different tolerance factors are generated through the first DOE stage, and then applied to determine feasible tolerance levels. The final tolerance assignments, like points scatted in high-dimensioned space with inherent uniformity, are then produced through uniform DOE in the second stage. Result shows that the majority of feasible tolerance assignments generated have more relaxed tolerance, which can facilitate the manufacturing process. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
19. Laparoscopic versus open appendectomy for acute appendicitis in children.
- Author
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Liu, Yu, Cui, Zhengmin, and Zhang, Rongpeng
- Subjects
APPENDICITIS treatment ,LAPAROSCOPIC surgery ,APPENDECTOMY ,PEDIATRIC surgery ,SURGICAL complications - Abstract
Objective: To compare the efficacy and safety of laparoscopic appendectomy and open appendectomy for acute appendicitis in children. Methods: This study was conducted as a retrospective comparison of hospital records for postoperative complications, duration of operation, and postoperative length of stay between children (aged <18y) who underwent laparoscopic ( n=190) or open ( n=199) appendectomy over a six-year period. Quality of life was evaluated immediately and 1 month postoperatively. Results: The major complication rate after surgery in laparoscopic group was significantly lower than that of open appendectomy group (13% vs 27%, P<0.05). The mean (SD) postoperative hospital stay was also shorter in laparoscopic group (2.4 (0.6) days vs 3.7 (1.1) days, P<0.05). The postoperative minor complication rate and hospital expenses were not significantly different between the two groups. The duration of surgery was longer in laparoscopic group ( P<0.05). Children in laparoscopic group had less postoperative pain and higher quality of life after one month than those in open appendectomy group. Conclusions: Laparoscopic technique seems to be safer than open appendectomy for acute appendicitis in children. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
20. Impacts of Dynamic LED Lighting on the Well-Being and Experience of Office Occupants.
- Author
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Zhang, Rongpeng, Campanella, Carolina, Aristizabal, Sara, Jamrozik, Anja, Zhao, Jie, Porter, Paige, Ly, Shaun, and Bauer, Brent A.
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- 2020
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21. The Spatial and Temporal Variability of the Indoor Environmental Quality during Three Simulated Office Studies at a Living Lab.
- Author
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Clements, Nicholas, Zhang, Rongpeng, Jamrozik, Anja, Campanella, Carolina, and Bauer, Brent
- Subjects
INTELLIGENT buildings ,ENVIRONMENTAL quality ,BUILT environment ,ENVIRONMENTAL monitoring ,LABORATORIES ,AUDITORY masking ,BUILDING layout ,HUMAN comfort - Abstract
The living lab approach to building science research provides the ability to accurately monitor occupants and their environment and use the resulting data to evaluate the impact that various components of the built environment have on human comfort, health, and well-being. A hypothesized benefit of the living lab approach is the ability to simulate the real indoor environment in an experimentally controlled setting over relatively long periods of time, overcoming a significant hurdle encountered in many chamber-type experimental designs that rarely reflect typical indoor environments. Here, we present indoor environmental quality measurements from a network of sensors as well as building system design and operational data demonstrating the ability of a living lab to realistically simulate a wide range of environmental conditions in an office setting by varying air temperature, lighting, façade control, and sound masking in a series of three human subject experiments. The temporal variability of thermal and lighting conditions was assessed on an hourly basis and demonstrated the significant impact of façade design and control on desk-level measurements of both factors. Additional factors, such as desk layout and building system design (e.g., luminaires, speaker system), also contributed significantly to spatial variability in air temperature, lighting, and sound masking exposures, and this variability was reduced in latter experiments by optimizing desk layout and building system design. While ecologically valid experimental conditions are possible with a living lab, a compromise between realism and consistency in participant experience must often be found by, for example, using an atypical desk layout to reduce spatial variability in natural light exposure. Based on the experiences from these three studies, experimental design and environmental monitoring considerations for future office-based living lab experiments are explored. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
22. Commercial Building Energy Saver: An energy retrofit analysis toolkit.
- Author
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Hong, Tianzhen, Piette, Mary Ann, Chen, Yixing, Lee, Sang Hoon, Taylor-Lange, Sarah C., Zhang, Rongpeng, Sun, Kaiyu, and Price, Phillip
- Subjects
- *
ENERGY consumption of buildings , *ENERGY conservation in buildings , *RETROFITTING , *ENERGY industries , *ENERGY economics - Abstract
Small commercial buildings in the United States consume 47% of the total primary energy of the buildings sector. Retrofitting small and medium commercial buildings poses a huge challenge for owners because they usually lack the expertise and resources to identify and evaluate cost-effective energy retrofit strategies. This paper presents the Commercial Building Energy Saver (CBES), an energy retrofit analysis toolkit, which calculates the energy use of a building, identifies and evaluates retrofit measures in terms of energy savings, energy cost savings and payback. The CBES Toolkit includes a web app (APP) for end users and the CBES Application Programming Interface (API) for integrating CBES with other energy software tools. The toolkit provides a rich set of features including: (1) Energy Benchmarking providing an Energy Star score, (2) Load Shape Analysis to identify potential building operation improvements, (3) Preliminary Retrofit Analysis which uses a custom developed pre-simulated database and, (4) Detailed Retrofit Analysis which utilizes real-time EnergyPlus simulations. CBES includes 100 configurable energy conservation measures (ECMs) that encompass IAQ, technical performance and cost data, for assessing 7 different prototype buildings in 16 climate zones in California and 6 vintages. A case study of a small office building demonstrates the use of the toolkit for retrofit analysis. The development of CBES provides a new contribution to the field by providing a straightforward and uncomplicated decision making process for small and medium business owners, leveraging different levels of assessment dependent upon user background, preference and data availability. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
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