Article
Construction & Building Technology
Michal Krajcik, Martin Simko, Ondrej Sikula, Daniel Szabo, Dusan Petras
Summary: The radiant wall heating and cooling system, tested with pipes attached to thermally insulating bricks, is suitable for building retrofit and new buildings due to its affordability and ease of installation. It provides fast thermal response and low thermal losses, benefiting energy efficiency. Installation on multiple walls can lead to a more uniform thermal environment compared to installing on a single wall.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Barbora Junasova, Michal Krajcik, Ondrej Sikula, Muslum Arici, Martin Simko
Summary: The application of radiant heating and cooling systems in building retrofit can make use of renewable energy sources in existing buildings. This research focused on adapting the design of ceiling and wall systems with pipes for improved heat transfer. The results showed that the spacing of the pipes and the type of insulation used have a significant impact on the system's efficiency and response time.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Wei Liao, Caifeng Wen, Yimo Luo, Jinqing Peng, Nianping Li
Summary: In this study, the energy consumption and indoor thermal environment of a radiant ceiling heating and cooling system with different transparent building envelopes were investigated. The results show that the type of transparent envelope affects the energy saving rate and thermal environment distribution.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Yuying Liang, Nan Zhang, Huijun Wu, Xinhua Xu, Ke Du, Jianming Yang, Qin Sun, Kaijun Dong, Gongsheng Huang
Summary: The study shows that the thermal environment and thermal comfort created by the DRCU under low radiant cooling temperatures meet the comfort criteria of the ASHRAE Standard.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Yakup Karakoyun, Ozgen Acikgoz, Bedri Onur Kucukyildirim, Zehra Yumurtaci, Ahmet Selim Dalkilic
Summary: Hydronic radiant heating systems are commonly used in conjunction with low temperature heat sources to provide high energy saving potential and improved thermal comfort. By employing augmentation methods and using nanofluids, heat transfer performance can be enhanced, with experiments showing that adding nanofluids can improve heat transfer efficiency.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Ashmin Aryal, Pipat Chaiwiwatworakul, Surapong Chirarattananon
Summary: This study investigated radiant ceiling cooling in office buildings in tropical hot humid climates. Full-scale experiments and simulations were conducted to assess the system performance and compare the results. The study found that exhaust air heat recovery and envelope insulation play important roles in energy saving and improving human comfort during radiant cooling.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Yakup Karakoyun, Ozgen Acikgoz, Alican Cebi, Aliihsan Koca, Gursel Cetin, Ahmet Selim Dalkilic, Somchai Wongwises
Summary: An artificial neural network investigation was conducted to predict heat transfer characteristics over a heated radiant ceiling, and the results showed that the experimental data and the outputs of the artificial neural network method were compatible. Through a numerical simulation software, the experimental data was successfully increased and proposed heat transfer coefficients for radiant ceiling heating applications.
APPLIED THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
Xiang Zhou, Yunliang Liu, Jingsi Zhang, Lifang Ye, Maohui Luo
Summary: Radiant cooling systems have the potential to reduce energy consumption, but radiant asymmetries can decrease occupants' thermal comfort.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Hongpu Liang
Summary: This study introduces the basic structure and control strategy of ground-source heat pump-floor radiant air conditioning system, and analyzes an experimental room in Xining, Qinghai province. The optimized control strategy proposed in this study can improve thermal comfort and reduce energy consumption.
INTERNATIONAL JOURNAL OF LOW-CARBON TECHNOLOGIES
(2021)
Review
Energy & Fuels
Maria M. Villar-Ramos, Ivan Hernandez-Perez, Karla M. Aguilar-Castro, Ivett Zavala-Guillen, Edgar Macias-Melo, Irving Hernandez-Lopez, Juan Serrano-Arellano
Summary: This study reviews and analyzes the current state of thermally activated building systems (TABS) in order to explore their potential in improving thermal comfort conditions and achieving energy savings. By classifying and analyzing the application of TABS in different building components, it is found that significant improvement in indoor air temperature and energy savings can be achieved. The study also highlights the complexity and costs of implementing TABS compared to traditional air conditioning systems.
Article
Chemistry, Multidisciplinary
Enrique Angel Rodriguez Jara, Alvaro Ruiz-Pardo, Marta Conde Garcia, Jose Antonio Tenorio Rios
Summary: The study found that woods with the lowest thermal conductivity can be efficiently utilized in radiant floor heating systems worldwide with start-up lag times similar to those of other floorings. There is no universal limit for thermal resistance in flooring, and the current standard limit of 0.15 m(2) K/W lacks objective justification. Climate and construction characteristics are essential factors in the selection of suitable flooring properties.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Yaxuan Xiong, Chenhua Yao, Ren Jing, Yuting Wu, Xu Qian, Binjian Nie, Li Chuan, Yulong Ding
Summary: This study proposes the use of industrial semicoke ash as skeleton material to fabricate low-cost thermal energy storage materials and shape-stable phase change composites. The results showed that the developed composite material has high thermal energy storage capacity and thermal conductivity.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Goosang Joe, Sanghoon Park
Summary: Amid concerns about COVID-19 transmission through airflow in crowded buildings, radiant ceiling heating panels have become necessary to replace convection heating systems. This study evaluates thermal comfort under different indoor and outdoor conditions and presents the conditions for thermal output of the radiant ceiling heating panel. The study also provides empirical formulas to determine heating conditions that ensure necessary heat dissipation while minimizing discomfort.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
Tao Hai, Hayder A. Dhahad, Jincheng Zhou, Anas Abdelrahman, Sattam Fahad Almojil, Abdulaziz Ibrahim Almohana, Abdulrhman Fahmi Alali, Teeba Ismail Kh, Kamal Sharma, Masood Ashraf Ali, Khaled Twfiq Almoalimi
Summary: This study investigated the energy utilization of a radiant floor system with phase change materials (PCMs) in the external walls and roof of a building through numerical analysis. The results showed that PCMs can significantly reduce energy consumption in specific climate conditions, and an artificial neural network (ANN) can accurately predict the energy utilization.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Construction & Building Technology
Eduardo M. Gonzalez-Cruz, Eduardo L. Kruger
Summary: The study aims to assess the thermal performance of a low-energy Radiant-Capacitive Heating and Cooling System that operates mainly with natural energy sources. The system combines passive strategies such as nocturnal radiative cooling, solar heating, and thermal activation of an indoor hydronic radiator. Experimental results show that the system is capable of reducing outdoor temperatures and has significant cooling potential and power.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Michal Krajcik, Ondrej Sikula
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Ekrem Tuncbilek, Muslum Arici, Michal Krajcik, Sandro Nizetic, Hasan Karabay
APPLIED THERMAL ENGINEERING
(2020)
Article
Construction & Building Technology
Jakub Oravec, Ondrej Sikula, Michal Krajcik, Muslum Arici, Martin Mohapl
Summary: This study compared six representative radiant heating systems in terms of thermal output, controllability, short-term and long-term heat storage, suitability for building retrofit, and investments. It was found that wall heating with pipes attached to a thermally insulating core had the highest thermal output and was most affordable.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Michal Krajcik, Martin Simko, Ondrej Sikula, Daniel Szabo, Dusan Petras
Summary: The radiant wall heating and cooling system, tested with pipes attached to thermally insulating bricks, is suitable for building retrofit and new buildings due to its affordability and ease of installation. It provides fast thermal response and low thermal losses, benefiting energy efficiency. Installation on multiple walls can lead to a more uniform thermal environment compared to installing on a single wall.
ENERGY AND BUILDINGS
(2021)
Review
Construction & Building Technology
Michal Krajcik, Muslum Arici, Ondrej Sikula, Martin Simko
Summary: This study reviews water-based wall systems for space heating and cooling and thermal barriers for reducing buildings' thermal load. It provides an overview of the research topics, including thermal performance, comfort, use of renewable energy sources, and application of phase change materials. The study also discusses the working principles, types, and designs of thermal barriers, as well as proposed classification systems for wall systems and thermal barriers. Benefits, drawbacks, and design recommendations for the wall systems are summarized.
ENERGY AND BUILDINGS
(2021)
Article
Engineering, Mechanical
Martin Simko, Dusan Petras, Michal Krajcik, Daniel Szabo
Summary: The experiment focused on measuring thermal output and sensitivity of a wall cooling system to design parameters, showing a fast thermal response and increasing cooling output with greater temperature difference between water and hotbox. The surface temperature was very close to the water temperature, with potential for enhancing cooling output by reducing surface temperature.
PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING
(2022)
Article
Construction & Building Technology
Barbora Junasova, Michal Krajcik, Ondrej Sikula, Muslum Arici, Martin Simko
Summary: The application of radiant heating and cooling systems in building retrofit can make use of renewable energy sources in existing buildings. This research focused on adapting the design of ceiling and wall systems with pipes for improved heat transfer. The results showed that the spacing of the pipes and the type of insulation used have a significant impact on the system's efficiency and response time.
ENERGY AND BUILDINGS
(2022)
Article
Green & Sustainable Science & Technology
Ahmet Yuksel, Muslum Arici, Michal Krajcik, Mihriban Civan, Hasan Karabay
Summary: This study investigated the impact of pandemic restrictions on energy consumption, thermal comfort, and indoor air quality in mosques in Turkey. The results showed that lighting energy consumption decreased due to less usage during the pandemic, while heating and cooling costs increased in one mosque despite restricted usage. Keeping windows open and limiting occupancy improved indoor air quality, evidenced by lower CO2 concentration during the pandemic. The study also found that acceptable thermal comfort was achieved at night during the summer period under pandemic measures.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Jakub Curpek, Miroslav Cekon, Ondrej Sikula, Richard Slavik
Summary: This study conducted numerical analyses on the dynamic thermal response of ventilated building-integrated photovoltaic (BiPV) facades with phase-change materials (PCM). The results demonstrated that the numerical approach can reliably predict the thermo-responsive capabilities of PCM-based BiPV facades and evaluate the impact of external temperature variations on the overall thermal and energy performance of the facade system. The reliability of the theoretical methods was validated through comparison with experimental data.
ENERGY AND BUILDINGS
(2023)
Proceedings Paper
Construction & Building Technology
Jakub Curpek, Miroslav Cekon, Ondrej Sikula, Muhammad Faisal Junaid
Summary: Simulation modelling of a specific building integrated photovoltaic (BiPV) facade system with latent thermal energy storage (LTES) using phase change material (PCM) is analyzed and validated through experimental measurements. Two simulation methods, EnergyPlus and Ansys, are used to compare two facade concepts (BiPV, BiPV/PCM) and explore the influence of PCM on heat transfer rate and dynamic thermal response. The findings provide insights into the consistency between theoretical results and experimental data, but also highlight the need for addressing limitations in further design.
SUSTAINABILITY IN ENERGY AND BUILDINGS 2022
(2023)
Article
Engineering, Civil
Veronika Gombosova, Michal Krajcik, Ondrej Sikula
Summary: This study evaluates the feasibility of using energy performance contracting (EPC) for the retrofit of precast concrete apartment buildings in Slovakia. The retrofit packages were evaluated using discounted payback and multiple economic scenarios. The results show that retrofitting the technical systems is more feasible than retrofitting the building envelopes. EPC is recommended for economic developments with significant increases in energy prices, but additional funding sources are necessary for complex retrofit projects.
SLOVAK JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Thermodynamics
Michal Krajcik, Dominik Strba, Michal Masaryk, Ondrej Sikula, Peter Mlynar
Summary: The study shows that combining steam jet ejector chillers with radiant chilled ceilings can increase the coefficient of performance and reduce energy consumption. Increasing the supply water temperature improves the performance coefficient and provides higher cooling capacity.
APPLIED THERMAL ENGINEERING
(2022)
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)
