Article
Environmental Sciences
Jacopo Famiglietti, Tommaso Toppi, Lorenzo Pistocchini, Rossano Scoccia, Mario Motta
Summary: This study compares the environmental profiles of a condensing boiler and a gas driven absorption heat pump for space heating and domestic hot water in old buildings, finding that despite higher electricity consumption, the gas driven absorption heat pump has a lower environmental profile due to lower natural gas usage in the use phase.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Huan Yang, Xiaolong Lin, Hejitian Pan, Sajie Geng, Zhengyu Chen, Yinhe Liu
Summary: Hydrogen-enriched natural gas (HENG) has attracted attention for its lower pollutant emissions and potential for industrial decarbonization. This study evaluated the energy saving and thermal performance of a condensing boiler burning HENG. Results showed that H2 enrichment increased flame radiation intensity and improved efficiency and heat transfer rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Morteza Ghanbarpour, Adrian Mota-Babiloni, Bassam E. Badran, Rahmatollah Khodabandeh
Summary: This study analyzed the global warming impact of environmentally friendly refrigerants as replacements for R134a and R245fa, showing that not only the coefficient of performance but also the emission factor play crucial roles in the selection of alternative refrigerants.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Jorn Hinrichs, Stefan Schweitzer-De Bortoli, Heinz Pitsch
Summary: Modeling framework was developed for numerical simulations of complex flow-field patterns in condensing gas boilers, using flamelet progress variable model and other models to address challenges like high computational times. The models were validated against resolved simulation results and experimental measurements, showing reasonable agreement.
Article
Energy & Fuels
Weicheng Liao, Xiaoyue Zhang, Zhen Li
Summary: This study proposes a more efficient and effective total heat recovery system that recovers waste heat from flue gas by dehumidifying the gas and humidifying the combustion air. The experimental results show that the system can significantly improve boiler thermal efficiency and reduce the emission of white plumes under high return water temperature conditions.
Review
Thermodynamics
Yiyu Men, Xiaohua Liu, Tao Zhang
Summary: The technology of waste heat recovery from medium-low temperature flue gas has been extensively reviewed, focusing on the principle and characteristics of various systems. More advanced waste heat recovery systems are proposed to enhance the difference between the cold source and the flue gas, with heat recovery efficiency exceeding 80% in some cases. Specific systems, such as heat pump systems and vapor pump boiler systems, are analyzed for their efficiency, economic benefits, and pollutant emissions.
Article
Thermodynamics
Vytautas Dagilis, Zilvinas Uldinskas, Liutauras Vaitkus, Hussam Jouhara, Robertas Poskas
Summary: Modern wood fuel plants produce flue gas with significant moisture content, requiring additional energy and investment for utilization of low-grade heat through mechanical heat pump technology. The heat carried by the flue gas depends on its heat capacity and temperature, both parameters are interdependent and need to be calculated beforehand.
Article
Energy & Fuels
Paula Sankelo, Kaiser Ahmed, Alo Mikola, Jarek Kurnitski
Summary: The Finnish government launched subsidies for private homeowner energy renovations, and this study reveals that using ground-source heat pumps with additional insulation and heat recovery measures can significantly reduce energy consumption.
Article
Construction & Building Technology
Katarina Simic, Ilya T'Jollyn, Willem Faes, Josue Borrajo Bastero, Jelle Laverge, Michel De Paepe
Summary: Despite being considered outdated, gas-fired heating boiler units remain a common source for residential heating energy demand. Current energy performance assessments for residential buildings lack detailed information and a consistent approach. This research aims to determine the necessary level of modeling detail to predict the performance of gas-fired condensing boilers accurately.
ENERGY AND BUILDINGS
(2021)
Article
Thermodynamics
Francesca Ceglia, Elisa Marrasso, Chiara Martone, Giovanna Pallotta, Carlo Roselli, Maurizio Sasso
Summary: The Total Equivalent Warming Impact (TEWI) index is commonly used to evaluate emissions from HVAC&R systems, but the Expanded Total Equivalent Warming Impact (ETEWI) index provides a more comprehensive assessment by considering additional environmental impacts. In this study, TEWI and ETEWI metrics are applied to an air-to-water electric heat pump (EHP) in Southern Italy. The results show that ETEWI increases by 4.8% compared to TEWI when the variation of refrigerant charge level is not considered, and by 6.5% when it is accounted for. Additionally, the indirect term of ETEWI decreases with the forecasted carbon dioxide emission factors for electricity production.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Engineering, Marine
Tae-Ho Lee, Sang-Hyun Lee, Jee-Keun Lee
Summary: This study prepared emulsified fuels to reduce air pollution emissions from ships and analyzed exhaust gas effects. The emulsified fuels showed improvements in emissions but also resulted in some negative impacts.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Hao Zhang, Yong Dong, Yanhua Lai, Xinbo Zhang
Summary: The study proposed a method to incorporate flash evaporation into the coal-fired flue gas OAHP system and introduced two optimized systems. Both systems showed improved thermal efficiency, especially the PROAHP system with a maximum increase in COP of 17.3%.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Sandeep Koundinya, Satyanarayanan Seshadri
Summary: In this paper, a 4E analysis method is used to analyze popular refrigerants and the best refrigerants are selected using TOPSIS. The results show that different refrigerants perform best within different condenser temperature ranges.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Green & Sustainable Science & Technology
Zongming Yang, Victoria Kornienko, Mykola Radchenko, Andrii Radchenko, Roman Radchenko
Summary: The application of water-fuel emulsion in internal combustion engines can reduce the consumption of sulfurous fuel oils to protect the environment and improve the efficiency of exhaust gas heat utilization. By decreasing the corrosion rate of condensing heat exchange surfaces, it is possible to lower the exhaust gas temperature, increase the efficiency of exhaust boilers, and save fuel.
Article
Environmental Sciences
Cavan McCaffery, Hanwei Zhu, Georgios Karavalakis, Thomas D. Durbin, J. Wayne Miller, Kent C. Johnson
Summary: This study evaluated the gaseous and particulate emissions from a Tier 2 oceangoing vessel using two emission control area (ECA) compliant fuels. Results showed that the novel ultra-low sulfur heavy fuel oil (ULSHFO) had slightly higher nitrogen oxide (NOx) emissions for both the main and auxiliary engines, and significantly increased NOx emissions for the auxiliary boiler. Additionally, ULSHFO had higher PM2.5 and black carbon emissions, with little contribution of sulfate due to the low sulfur content in both fuels.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Construction & Building Technology
D. A. Krawczyk, A. Rodero, K. Gladyszewska-Fiedoruk, A. Gajewski
ENERGY AND BUILDINGS
(2016)
Article
Thermodynamics
Andrzej Gajewski
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Construction & Building Technology
Katarzyna Gladyszewska-Fiedoruk, Anna B. Demianiuk, Andrzej Gajewski, Anna Olow
ENERGY AND BUILDINGS
(2011)
Article
Construction & Building Technology
Katarzyna Gladyszewska-Fiedoruk, Andrzej Gajewski
ENERGY AND BUILDINGS
(2012)
Article
Thermodynamics
Andrzej Gajewski
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2008)
Article
Thermodynamics
Andrzej Gajewski
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2008)
Article
Thermodynamics
Andrzej Gajewski
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2009)
Article
Green & Sustainable Science & Technology
Andrzej Gajewski, Katarzyna Gladyszewska-Fiedoruk, Dorota Anna Krawczyk
Article
Energy & Fuels
Tomasz Janusz Teleszewski, Andrzej Gajewski
Article
Energy & Fuels
Sara Sewastianik, Andrzej Gajewski
Article
Energy & Fuels
Karolina Weremijewicz, Andrzej Gajewski
Summary: The study reveals that 20% of global electricity supplied to buildings is used to prevent air temperature increase, and this consumption is expected to triple by 2050 to meet China's current needs. The research focuses on how heat removed from thermal power plants can be used for cold generation in absorption devices, specifically investigating liquid film break-up and velocity profiles in flow for better understanding.
Article
Energy & Fuels
Sara Sewastianik, Andrzej Gajewski
Summary: The study evaluates the energy policy of Poland until 2040 by comparing greenhouse gas and particulate matter emissions in different climatic zones. It suggests that after implementing the policy, all heat pumps will be viable devices, but not all of them will have lower emissions than gas boilers. Hence, further measures are needed to reduce emissions, such as replacing coal-fired power plants with natural gas-fired gas turbines.
Proceedings Paper
Energy & Fuels
Andrzej Gajewski
INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY SYSTEMS AND ENVIRONMENTAL ENGINEERING (ASEE17)
(2017)
Article
Thermodynamics
A Gajewski
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2005)
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)