Energy-efficient Ventilation

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Featured papers represent cutting-edge research with significant potential for high impact in the field. A Feature Paper should be a substantive original article that incorporates several techniques or approaches, provides an outlook on future research directions, and describes potential research applications.

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Papers are submitted by invitation or individual recommendation by the scientific editors and must receive positive feedback from the reviewers.

Editor’s Choice articles are based on the recommendations of scientific journal editors from around the world. The editors select a small number of articles recently published in the journal that they believe will be of particular interest to readers, or relevant to the relevant field of research. The aim is to provide a snapshot of some of the most exciting work published in the journal’s various research areas.

By John Kaiser CalautitJohn Kaiser Calautit SciProfiles Scilit Preprints.org Google Scholar 1, * and Hassam Nasarullah ChaudhryHassam Nasarullah Chaudhry SciProfiles Scilit Preprints.org Google Scholar 2, *

Department of Architectural Engineering, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Dubai P.O. Box 38103, United Arab Emirates

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The built environment sector is responsible for a significant portion of global final energy consumption [1] and carbon emissions. Energy demand from buildings is expected to continue to increase and will have major social consequences and climate change impacts [2]. Drivers include population growth, improved access to electricity and adequate housing worldwide, and increasing demands for air conditioning.

A large proportion of building energy use is due to heating, ventilation and air conditioning (HVAC) systems [3]. While reducing HVAC energy consumption presents an excellent opportunity to curb the growth rates of energy demand, comfort of use and health should not be compromised [4]. HVAC regulates the temperature, humidity and air quality in a building, which is essential for maintaining a comfortable and healthy indoor environment [5]. The quality of the indoor environment also affects our productivity and well-being and, therefore, should be carefully considered when designing HVAC systems [6]. The challenges to achieving sustainability in HVAC systems are extensive and, therefore, present an abundance of opportunities for researchers and industries to improve the performance and efficiency of HVAC systems.

The contents of this special issue reflect the ingenuity and commitment of the scientific community to address these challenges by conducting high-quality research and disseminating knowledge. It can be proven that research in the field of sustainable HVAC technologies in encouraging low carbon environments is diverse and multidisciplinary in nature and is widespread among scientists and researchers.

The articles that were submitted, as well as those ultimately selected for publication, cover a wide range of subject areas ranging from the science and technology of low-energy systems, data-driven parametric studies and social analysis to technology investigations. low energy. within a global climate. The eight selected research papers can be grouped into three main topics: (1) ventilation systems, (2) intelligent building energy management systems, and (3) energy-efficient heating and cooling systems.

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As guest editors, we were pleased to receive several papers on these topics from authors and institutions from many countries. Figure 1 shows the geographical distribution of the authors and their institutions.

Here, we provide a brief summary of the articles [7, 8, 9, 10, 11, 12, 13, 14] published in the Special Issue. A graphical summary of the main areas covered in the Special Issue is shown in Figure 2.

Contributions devoted to the evaluation of different types of ventilation systems and strategies include four articles. The recent COVID-19 pandemic has further raised our awareness of the importance of good ventilation in buildings. Many institutions and organizations, such as the World Health Organization (WHO), recommended ensuring adequate ventilation and increasing the total air supply in buildings to minimize the spread of the coronavirus and other respiratory viruses. However, this can affect the energy efficiency of buildings; for example, increased ventilation in cold and mild climates can lead to increased heat loss [16]. Therefore, it is essential to achieve a balance between indoor air quality and energy consumption when developing ventilation systems [17].

Andersson et al. (2020) [7] studied the ventilation performance of a low momentum confluent jet supply device in a classroom setting. Different cases are investigated experimentally with different air flow rates, supply air temperature and supply device configuration. Four types of supply equipment were compared to investigate the indoor climate. Performance was also investigated in relation to indoor air quality (IAQ), thermal comfort and energy efficiency. The results show that confluent jet ventilation produced more stratified conditions with higher air flow rates, leading to greater heat removal efficiency. The study concluded that modified low-impedance confluent jets provided an improved indoor climate with the highest energy efficiency of all devices.

Air Ventilation System In Passive House For Energy Efficiency Stock Photo

In their recent study, Andersson et al. (2022) [8] developed a numerical model to further evaluate the performance of ceiling-mounted confluent jet ventilation supply devices. The study investigated the impact of design and operating parameters on comfort, air quality and heat removal efficiency. The developed computational fluid dynamics numerical model was in good agreement with the experimental data. Findings indicated that aircraft size group had a significant impact on indoor conditions. The larger array of multi-row jets led to greater indoor air quality and heat removal. It was also noted that lower inflow velocities also reduced the risk of draft and occupant disturbance.

In the study by Javed et al. (2021) [9], numerical and experimental evaluations of a displacement ventilation system for providing space preheating in cold climates were performed. Unlike traditional systems, displacement ventilation without a separate heating system was proposed to reduce cost and energy use. Experimental tests were conducted in a laboratory-scale classroom under regulated conditions and in a real classroom with dynamic posture and environmental conditions. Several comfort and IAQ parameters were evaluated. The findings showed that the proposed system could maintain comfortable indoor conditions even under extreme operating conditions. The results from the numerical modeling highlighted the limitations of the existing simulation model, which was unable to capture the thermal behavior of the system. They suggested that future studies should focus on advanced transient simulations and include detailed layering and more sophisticated nodal models.

Yau et al. (2022) [10] proposed a hybrid system that combines a variable coolant flow system with layer ventilation to provide energy-efficient cooling in buildings. The focus of the work was on the influence of the design of terminal air supply devices on the performance of ventilation and thermal comfort of the hybrid system. Experimental tests were conducted to evaluate five different types of air supply terminal equipment. The findings showed that the strip grille led to an improved airflow velocity distribution and thermal environment than all other types of diffusers.

The role of smart technology in dynamic building HVAC control is analyzed in the following article. Roccotelli etc. (2020) [11] proposed an integrated method to model the behavior of occupants in a building and use intelligent building energy management for passive cooling techniques. The study focused on optimizing natural ventilation and shading control to minimize thermal disturbance and energy use in a building in a warm climate. The integrated method used several tools, including TRNSYS, Matlab, and Daysim. The results showed that the optimization method led to improved BMES control, which reduced thermal disturbance and cooling energy requirements. The study highlighted the importance of considering the stochastic behavior of occupants when designing control systems for passive cooling strategies.

Energy Efficient House Ventilation System Residual Energy Heat Stock Vector

Contributions related to energy efficient heating and cooling systems are highlighted in the following three articles. Amanowicz and Wojtkowiak (2021) [12] evaluated the use of a multi-tube structure for a ground-to-air heat exchanger system for the ventilation of a building. The thermal and energy performances of various multi-pipe systems were compared with a single-pipe system. A laboratory-scale experiment was conducted to evaluate the flow characteristics of different configurations of ground-to-air heat exchangers, and a simple mathematical model was used to calculate the energy consumption. The findings showed that a single pipe configuration with a suitable pipe diameter was able to achieve similar thermal performance and pressure loss as the multi-pipe system. At the same time, a multi-pipe system can also have larger diameter pipes, which increase its energy efficiency. The study highlights the challenges of designing such a system and the importance of using evaluation methods that take into account techno-economic aspects.

Eveloy and Alkendi (2021) [13] proposed a solar-assisted multi-ejector space cooling system as an alternative to conventional air conditioning to minimize energy requirements in buildings in hot climates. A mathematical model was used to perform the assessment. performance

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