Article
Construction & Building Technology
Jiazhen Ling, Daniel A. Dalgo, Shengwei Zhu, Yiyuan Qiao, Lingzhe Wang, Vikrant Aute, Jelena Srebric, Jan Muehlbauer, Yunho Hwang, Reinhard Radermacher
Summary: Personal Conditioning Devices (PCD) create a microenvironment around users, better satisfying individual thermal comfort compared to central HVAC systems. The RoCo is a novel PCD that provides conditioned air for up to 8 hours without rejecting waste heat. Experimental tests and EnergyPlus simulations demonstrate the significant energy-saving potential of RoCo in centrally air-conditioned buildings.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Le Wang, Mohammad Khishe, Mokhtar Mohammadi, Arsalan Mahmoodzadeh
Summary: Green building with the purpose of increasing personal comfort is a vital problem that requires immediate attention. This article proposes a hybrid model to measure interior individual thermal comfort and design a comfortable and ecologically beneficial thermal environment. Different models are compared and the most accurate model is recommended for prediction.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Jose Joaquin Aguilera, Dragos-Ioan Bogatu, Ongun Berk Kazanci, Charalampos Angelopoulos, Daniel Coakley, Bjarne W. Olesen
Summary: A control framework for mixed-mode buildings was defined based on the adaptive comfort model and PMV-PPD method, tested using simulation analysis of an office building module, and shown to reduce energy use by 12-51% compared to mechanically cooled buildings. Utilizing the upper limit of the adaptive comfort zone as cooling set point led to additional energy savings and fewer switchovers between operation modes, demonstrating the potential for large reductions in energy use without compromising comfort or indoor air quality in mixed-mode buildings.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Claudia Naldi, Matteo Dongellini, Gian Luca Morini, Eugenia Rossi di Schio
Summary: The optimization of energy consumption in buildings' HVAC systems plays a crucial role in reducing greenhouse gas emissions worldwide. This study compares the performance of traditional manual balancing valves and new pressure independent control valves (PICVs) in hydronic loop balancing of HVAC systems. Results show that PICVs provide better indoor thermal comfort and energy savings compared to traditional valves under different operating conditions.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Yuzhen Peng, Nogista Antanuri, Siu-Kit Lau, Bahador Jebelli, Steve Kardinal Jusuf, Clayton Miller, Yi Ting Teo, Yun Xuan Chua, Adrian Chong
Summary: Mixed-mode buildings utilize both natural ventilation and mechanical air-conditioning systems to achieve energy savings without compromising occupant comfort. However, there is a lack of clear guidelines for assessing occupants' thermal perception and the interaction effects between thermal and acoustic comfort in these buildings. This study conducted a field study in a mixed-mode office building in Singapore and found that the operation modes and traffic noise significantly affect thermal sensation and acceptability. The findings suggest the need for a different thermal comfort model and provide valuable information for the practical operation of mixed-mode buildings.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Louise R. L. Christensen, Steffen Petersen
Summary: Several studies have shown that Economic Model Predictive Control (EMPC) can use building thermal mass to provide demand response for the energy supply system. However, the acceptance of EMPC by residents depends on whether they are willing to tolerate the fluctuating indoor air temperatures caused by this control strategy. Limited evidence suggests that it is important to explain the economic and environmental benefits of EMPC in order for residents to abandon their current preferences and practices. This study aims to investigate whether residents would accept indoor temperature fluctuations induced by EMPC when they are aware of the environmental and/or economic benefits. The results indicate that residents are willing to accept temperature fluctuations as long as they do not feel too cold.
ENERGY AND BUILDINGS
(2023)
Review
Construction & Building Technology
Jungsoo Kim, Richard de Dear
Summary: This paper reviews important research themes in mixed-mode buildings, highlighting the differences in occupant perception of indoor thermal environment based on building operation mode. Occupants in mixed-mode buildings have a wider comfort zone compared to fully air-conditioned buildings, with significant energy saving potential. Future research should focus on optimizing comfort, control level, and associated energy demands.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Yuxin Wu, Aleksi Maki, Juha Jokisalo, Risto Kosonen, Simo Kilpelainen, Sonja Salo, Hong Liu, Baizhan Li
Summary: Demand response of district heating is a useful tool for reducing costs and emissions in the energy system, but it is important to consider thermal comfort. An experimental study showed that limiting the surface temperature of windows can help minimize draught risk, especially with poorly insulated windows.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Maryam Khoshbakht, Fan Zhang, Zahra Sadat Zomorodian, Zhonghua Gou
Summary: This study evaluates thermal sensitivity, expectations, and adaptability in mixed-mode ventilated buildings through subjective and objective assessments. The findings show that thermal adaptability and preferences change as the ventilation system switches between natural ventilation (NV) and air-conditioning (AC). The occupants in the study exhibited higher sensitivity to temperature changes than previously reported, but thermal sensitivity remained the same under different modes of operation. Moreover, the research found that the thermal comfort range was wider under NV operation compared to predicted values, while it was the same as predicted values under AC operation.
BUILDING RESEARCH AND INFORMATION
(2023)
Article
Construction & Building Technology
Jing Hou, Yuexia Sun, Yangrui Song, Jungsoo Kim, Thomas Parkinson, Richard de Dear
Summary: This study conducted a field research on adaptive comfort behaviors in residential buildings in Tianjin, China. Results showed that adjusting clothing insulation is crucial for achieving thermal comfort, and different thermally adaptive behaviors are adopted by occupants based on outdoor temperatures, such as using windows or turning on air conditioning.
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Construction & Building Technology
Yue Lei, Zeynep Duygu Tekler, Sicheng Zhan, Clayton Miller, Adrian Chong
Summary: Mixed-mode ventilation is a promising solution for achieving energy-efficient and comfortable indoor environments. This study found that occupants can thermally adapt when switching between natural ventilation (NV) and air-conditioning (AC) modes within the same day, with the adaptation process stabilizing between 35 to 45 minutes after the mode switch. These findings are important for optimizing thermal comfort in mixed-mode controls, considering the dynamic nature of thermal adaptation.
BUILDING AND ENVIRONMENT
(2024)
Article
Thermodynamics
Neha Kumari Agarwal, Pinakpani Biswas, Anand Shirke
Summary: This study proposes a novel model of cooling tower and an energy harnessing control system to improve overall efficiency based on prevailing climatic conditions. By employing model predictive control, the draft fan speed and pump flow rate of the cooling tower are controlled according to climatic conditions. Experimental results show that energy consumption is reduced by approximately 30% compared to traditional operation.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Shiro Arata, Shun Kawakubo
Summary: The thermal environment in offices has an impact on workers' productivity, and adjusting the thermal environment appropriately with heating, ventilation, and air conditioning is crucial. This study investigates the use of mixed-mode ventilation to reduce air conditioning power consumption and improve productivity during springtime. The results show that mixed-mode ventilation can decrease energy consumption and improve productivity, although there may be differences based on gender.
BUILDING AND ENVIRONMENT
(2022)
Review
Construction & Building Technology
Saman Taheri, Paniz Hosseini, Ali Razban
Summary: Intelligent buildings use predictive technologies to optimize HVAC systems, reducing energy consumption while maintaining comfort. Model predictive control is an effective management method that can enhance energy efficiency by considering multiple objectives.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Radhe S. T. Saini, Shrey K. Patel, Hari S. Ganesh
Summary: This paper presents a novel, model-based approach for controlling indoor particulate matter (PM) concentration and temperature in a residential house. A physics-based model is developed to predict indoor PM concentration and temperature based on various factors. The optimized settings of ventilation systems are determined using a nonlinear model predictive control algorithm. A case study in Delhi demonstrates the ability of the control system to maintain desired indoor levels while optimizing energy consumption.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Hui Xiao, Qi Kang, Jie Zhao, Yun-shi Xiao
BUILDING AND ENVIRONMENT
(2010)
Article
Construction & Building Technology
Jie Zhao, Bertrand Lasternas, Khee Poh Lam, Ray Yun, Vivian Loftness
ENERGY AND BUILDINGS
(2014)
Article
Construction & Building Technology
Jie Zhao, Khee Poh Lam, B. Erik Ydstie, Omer T. Karaguzel
JOURNAL OF BUILDING PERFORMANCE SIMULATION
(2015)
Article
Construction & Building Technology
Jie Zhao, Khee Poh Lam
SUSTAINABLE CITIES AND SOCIETY
(2012)
Article
Construction & Building Technology
Anja Jamrozik, Nicholas Clements, Syed Shabih Hasan, Jie Zhao, Rongpeng Zhang, Carolina Campanella, Vivian Loftness, Paige Porter, Shaun Ly, Selena Wang, Brent Bauer
BUILDING AND ENVIRONMENT
(2019)
Article
Construction & Building Technology
Samiran Khorat, Debashish Das, Rupali Khatun, Sk Mohammad Aziz, Prashant Anand, Ansar Khan, Mattheos Santamouris, Dev Niyogi
Summary: Cool roofs can effectively mitigate heatwave-induced excess heat and enhance thermal comfort in urban areas. Implementing cool roofs can significantly improve urban meteorology and thermal comfort, reducing energy flux and heat stress.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Qi Li, Jiayu Chen, Xiaowei Luo
Summary: This study focuses on the vertical wind conditions as a main external factor that limits the energy assessment of high-rise buildings in urban areas. Traditional tools for energy assessment of buildings use a universal vertical wind profile estimation, without taking into account the unique wind speed in each direction induced by the various shapes and configurations of buildings in cities. To address this limitation, the study developed an omnidirectional urban vertical wind speed estimation method using direction-dependent building morphologies and machine learning algorithms.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Xiaojun Luo, Lamine Mahdjoubi
Summary: This paper presents an integrated blockchain and machine learning-based energy management framework for multiple forms of energy allocation and transmission among multiple domestic buildings. Machine learning is used to predict energy generation and consumption patterns, and the proposed framework establishes optimal and automated energy allocation through peer-to-peer energy transactions. The approach contributes to the reduction of greenhouse gas emissions and enhances environmental sustainability.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Ying Yu, Yuanwei Xiao, Jinshuai Chou, Xingyu Wang, Liu Yang
Summary: This study proposes a dual-layer optimization design method to maximize the energy sharing potential, enhance collaborative benefits, and reduce the storage capacity of building clusters. Case studies show that the proposed design significantly improves the performance of building clusters, reduces energy storage capacity, and shortens the payback period.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Felix Langner, Weimin Wang, Moritz Frahm, Veit Hagenmeyer
Summary: This paper compares two main approaches to consider uncertainties in model predictive control (MPC) for buildings: robust and stochastic MPC. The results show that compared to a deterministic MPC, the robust MPC increases the electricity cost while providing complete temperature constraint satisfaction, while the stochastic MPC slightly increases the electricity cost but fulfills the thermal comfort requirements.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Somil Yadav, Caroline Hachem-Vermette
Summary: This study proposes a mathematical model to evaluate the performance of a Double Skin Facade (DSF) system and its impact on indoor conditions. The model considers various design parameters and analyzes their effects on the system's electrical output and room temperature.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Ruijun Chen, Holly Samuelson, Yukai Zou, Xianghan Zheng, Yifan Cao
Summary: This research introduces an innovative resilient design framework that optimizes building performance by considering a holistic life cycle perspective and accounting for climate projection uncertainties. The study finds that future climate scenarios significantly impact building life cycle performance, with wall U-value, windows U-value, and wall density being major factors. By using ensemble learning and optimization algorithms, predictions for carbon emissions, cost, and indoor discomfort hours can be made, and the best resilient design scheme can be selected. Applying this framework leads to significant improvements in building life cycle performance.
ENERGY AND BUILDINGS
(2024)