Article
Construction & Building Technology
Chen Xu, Yiwei Xie, Shangwen Huang, Shangjun Zhou, Wenbo Zhang, Yixiao Song, Yongqiang Luo, Zhiyong Tian
Summary: The importance of evaluating human thermal comfort lies in the development of healthy and low-carbon buildings. This study presents a coupled analysis of an integrated human exergy model and an indoor CFD model, which bridges the gap between human and building environment. The optimized human exergy model, combined with CFD, provides suitable air supply conditions for indoor thermal comfort and work efficiency.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Thatiana Jessica da Silva Ribeiro, Carlos Eduardo Keutenedjian Mady
Summary: This study compared three methods to evaluate the exergy behavior of the human body with the aim to determine thermal comfort conditions. All methods indicated equivalent points of thermal comfort conditions, raising questions about the application of exergy analysis in different models.
Review
Green & Sustainable Science & Technology
Z. Rahimi-Ahar, M. S. Hatamipour
Summary: This study explores the improvements in thermal desalination systems, with a focus on exergy. The research suggests that efforts should be made to minimize exergy destruction in order to enhance the overall efficiency of standalone systems. The integration of different desalination technologies and optimization of various factors can increase the exergy efficiency of a desalination plant.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Construction & Building Technology
Silvia Angela Mansi, Ilaria Pigliautile, Marco Arnesano, Anna Laura Pisello
Summary: Personal comfort models (PCM) represent the most promising paradigm for human-centric thermal comfort in buildings. Advances in wearable sensing suggest that the use of physiological data for real-time comfort measurement can be the start-up of the next generation of building design and operation with PCMs. This study presents the results from a large original experimental campaign aiming at human thermal comfort decoding via physiological signal, demonstrating the potential of physiological measurements in identifying specific thermal sensations.
BUILDING AND ENVIRONMENT
(2022)
Article
Energy & Fuels
Henrikki Pieska, Adnan Ploskic, Sture Holmberg, Qian Wang
Summary: Global climate change has increased the demand for space cooling, and radiant cooling systems provide improved thermal comfort but may have reduced energy efficiency due to dehumidification. A study comparing the performances of radiant cooling systems with and without dehumidification was conducted, showing that the system with dehumidification produces better thermal comfort conditions at the cost of higher energy and exergy consumption.
Article
Multidisciplinary Sciences
Chenyan Song, Amy D. D. Droitcour, Shekh M. M. Islam, Avon Whitworth, Victor M. M. Lubecke, Olga Boric-Lubecke
Summary: Cognitive buildings can adjust lighting, temperature, ventilation, and other environmental parameters based on occupants' responses to the built environment. Doppler-radar based sensors have shown accurate occupancy detection and estimation of vital signs in challenging scenarios where other sensors fail. These sensors provide valuable information for space utilization optimization and can be used to improve human-building interactive systems.
SCIENTIFIC REPORTS
(2023)
Review
Thermodynamics
Yat Huang Yau, Hui Sin Toh, Bee Teng Chew, Nik Nazri Nik Ghazali
Summary: This paper reviews the literature on the human thermal comfort model and explores the potential impact of raising indoor temperature to reduce air conditioning energy consumption in tropical regions on the indoor environmental quality and thermal comfort. Developing a human thermal comfort model based on stratum ventilation mode can serve as a reference for air conditioning system design in tropical buildings and indirectly reduce greenhouse gas emissions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Mohammad Hossein Jahangir, Saheb Ghanbari Motlagh
Summary: There is a lack of research on the thermal properties of lightweight roofs, with most studies focusing on their mechanical characteristics. Understanding the thermal behavior of lightweight roof systems is important for promoting energy-efficient design practices. The absence of comprehensive research in this domain limits the optimization of thermal insulation mechanisms in lightweight roofs, hindering efforts to reduce energy consumption in buildings. This study investigates the thermal performance of two lightweight roofs, the waffle slab and bubble deck, in different climates and compares them with conventional cement block roofs. The results show that the bubble deck roof outperforms other roofs in terms of heat loss reduction and overall efficiency, demonstrating its potential in enhancing energy efficiency and occupant comfort.
Article
Construction & Building Technology
Tamara Bajc, Anton Kercov, Milan Gojak, Maja Todorovic, Nikolina Pivac, Sandro Nizetic
Summary: This study proposes a novel method for calculating metabolic rate using measured CO2 concentration in indoor air, and a polynomial relation between metabolic rate and Predicted Mean Vote (PMV) is proposed. The results show that treating CO2 concentration as a variable has a significant impact on thermal comfort assessment and correlations between thermal comfort and human body exergy consumption rate.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Jinhua Hu, Xiaoli Hao, Minhua Huang, Yingdong He, Nianping Li, Yaolin Lin, Shiqiang Chen
Summary: This study investigates the thermal comfort of using a thermal-conductive bed in summer. The results show that without water supply, the bed surface temperature is slightly higher than the indoor temperature, and subjects feel slightly warm. When the supply water temperature is 28 or 30 degrees C, subjects feel thermally comfortable during a night's sleep.
Article
Thermodynamics
Zhimin Zheng, Yuchun Zhang, Yudong Mao, Yanping Yang, Chuhao Fu, Zhaosong Fang
Summary: Through field measurements and questionnaire surveys, this study found that the SET* and PMV models obtained in the current research cannot accurately evaluate the thermal comfort of people in prefab construction site offices. Calculations showed that the natural SET* values in prefab buildings were higher than the preferred SET*, leading to the need for model revisions to improve accuracy.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Review
Construction & Building Technology
Yuchen Ji, Jusheng Song, Pengyuan Shen
Summary: This paper discusses the influence of solar radiation on human thermal comfort and applies and discusses thermophysiological models and thermal comfort models. The key factors to consider in establishing dynamic thermal comfort models are highlighted.
BUILDING AND ENVIRONMENT
(2022)
Review
Construction & Building Technology
Runming Yao, Shaoxing Zhang, Chenqiu Du, Marcel Schweiker, Simon Hodder, Bjarne W. Olesen, Jorn Toftum, Francesca Romana D'Ambrosio, Hansjuergen Gebhardt, Shan Zhou, Feng Yuan, Baizhan Li
Summary: This paper reviews the historical evolution of thermal comfort research, focusing on adaptive thermal comfort studies and evaluating representative prediction models. Based on the analysis, three thermal environment assessment approaches are classified and their strengths and constraints are analyzed.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Tiantian Xu, Runming Yao, Chenqiu Du, Baizhan Li, Fangxin Fang
Summary: Understanding the relationship between past thermal experience and outdoor thermal comfort is important for sustainable urban design and city resilience. This study aims to reveal the quantitative relations and develop a new model by conducting a year-long survey and campaign in Chongqing, China. The results show that the temperature of past outdoor thermal experience is correlated with thermal sensitivity, deviation, and outdoor thermal demands. Based on the analysis, a new model has been developed and outdoor adaptive thermal comfort zones have been drawn.
BUILDING AND ENVIRONMENT
(2023)
Article
Environmental Sciences
Sijing Liu, Yongxin Xie, Yingxin Zhu, Borong Lin, Bin Cao, Nyuk Hien Wong, Jianlei Niu, Zhaosong Fang, Dayi Lai, Weiwei Liu, Jianxiu Wen, Di Mou, Hao Tang, Zhaoru Liu, Marcel Ignatius
Summary: The study demonstrates that people are less sensitive to changes in thermal environment outdoors compared to indoors. Thermal comfort cannot be simply equated to thermal neutrality, especially in outdoor spaces. Outdoor spaces in certain climate zones exhibit higher comfort rates, and natural thermal resources may hold the key to extending indoor comfort ranges.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Physics, Multidisciplinary
Carlos Eduardo Keutenedjian Mady, Clara Reis Pinto, Marina Torelli Reis Martins Pereira
Article
Engineering, Mechanical
Clara Reis Pinto, Carlos Eduardo Keutenedjian Mady
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2020)
Article
Green & Sustainable Science & Technology
Rafael Fernandes Mosquim, Carlos Eduardo Keutenedjian Mady
Summary: The study analyzes the exergy efficiencies of the Brazilian passenger vehicle fleet from 1970 to 2020, revealing low efficiencies but an improvement trend in recent years, with a reversal in the decrease of transportation service required around 2010.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Physics, Multidisciplinary
Lucas Sandoli Lima, Carlos Eduardo Keutenedjian Mady
Summary: The paper applies energy and exergy analysis to the air dehumidification unit of a liquid desiccant system in an industrial gelatin conveyor dryer, evaluating the energy and exergy behaviors and the substitution of a absorption unit for a vapor compression chiller. Results show that the vapor compression systems perform better, even when utilizing the condenser's energy to pre-heat the solution.
Article
Thermodynamics
Thatiana Jessica da Silva Ribeiro, Carlos Eduardo Keutenedjian Mady
Summary: This study compared three methods to evaluate the exergy behavior of the human body with the aim to determine thermal comfort conditions. All methods indicated equivalent points of thermal comfort conditions, raising questions about the application of exergy analysis in different models.
Article
Engineering, Mechanical
Mario Affonso Ranieri, Gabrielle Manieri, Carlos Eduardo Keutenedjian Mady, Cyro Albuquerque
Summary: This study evaluated the feasibility of recovering energy from the cooling and exhaust systems of an internal combustion engine for an absorption refrigeration system. Sensors were used to measure exhaust gas temperature and mass flow, with experiments and simulations revealing that significant cooling capacity could be achieved under different driving conditions, especially in urban areas.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Energy & Fuels
Rafael Fernandes Mosquim, Carlos Eduardo Keutenedjian Mady
Summary: The rate of technological progress is crucial for predicting future energy consumption and greenhouse gas emissions in light-duty fleets. Brazil has a knowledge gap in this area. Although Brazil's technological progress rate is lower, there is an upward trend. Performance improvements partially offset efficiency gains, and the shift towards larger vehicles counteracts some efficiency improvements.
Article
Physics, Multidisciplinary
Marina Torelli Reis Martins Pereira, Monica Carvalho, Carlos Eduardo Keutenedjian Mady
Summary: This study focuses on analyzing the energy demand and greenhouse gas emissions of a typical Brazilian household, finding that urban transportation has the highest intensity of greenhouse gas emissions and energy consumption, while electricity has relatively low emissions. Additionally, the chemical exergy of solid waste presents an opportunity for improvement.
Article
Multidisciplinary Sciences
Tatiane Lie Igarashi, Tiago Lazzaretti Fernandes, Arnaldo Jose Hernandez, Carlos Eduardo Keutenedjian Mady, Cyro Albuquerque
Summary: This study investigates the skin temperature distribution during running and cycling exercises. The findings show that the average skin temperature decreases during both tests, but with a higher variation in running. Additionally, the upper limbs experience a greater decrease in temperature during running.
Article
Green & Sustainable Science & Technology
Felipe Rivabem Gimenez, Carlos Eduardo Keutenedjian Mady, Izabela Batista Henriques
Summary: This study investigated the characteristics, penalties, gains, and challenges in the electrification and hybridization process for long-range aircraft. A comparison was made between a reference aircraft and more-electric and hybrid-electric versions of the same type. The results showed that the hybrid powertrains exhibited superior behavior and reduced fuel consumption. However, the viability of long-range hybrid-electric aircraft will require substantial time due to the low density of batteries available on the market.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Henrique Naim Finianos Feliciano, Fernando Fusco Rovai, Carlos Eduardo Keutenedjian Mady
Summary: This article focuses on the thermodynamic concept of exergy, which evaluates the quality of energy and its irreversibilities in machines. It presents simulations of passenger vehicles to understand the exergy destruction in internal combustion engine vehicles (ICEVs) and battery electric vehicles (BEVs), considering different energy mixes. The results show that BEVs have a higher exergy efficiency compared to ICEVs, but EVs in Europe produce more GHG than ethanol-fueled ICE vehicles in Brazil.
Article
Thermodynamics
Fernando Fusco Rovai, Sonia Regina da Cal Seixas, Carlos Eduardo Keutenedjian Mady
Summary: The mobility sector needs to reduce the carbon footprint of vehicles throughout their entire life cycle, from production to usage and recycling. The carbon footprint of vehicle usage depends on mileage, driving profile, and the carbon intensity of the energy source, with regional specificities regarding biofuels and the renewability of the electrical grid. Although battery-electric vehicles offer higher energy efficiencies, their adoption is hindered by high costs and the lack of recharging infrastructure.
Article
Green & Sustainable Science & Technology
Felipe Godoy Righetto, Carlos Eduardo Keutenedjian Mady
Summary: The objective of this study was to conduct an exergy analysis of sun-plant interactions in sugarcane, with the aim of estimating plant production and exergy flows and describing their photosynthetic efficiency. The findings revealed an average second-law efficiency of 5% for sugarcane photosynthesis production, with an estimated harvest of approximately 16.29 kWh/m2 of useful extended exergy after a year.