Use of sunspaces to obtain energy savings by preheating the intake air of the ventilation system: Analysis of its main characteristics in the different Spanish climate zones

Gainza-Barrencua, Joseba; Odriozola-Maritorena, Moisés; Barrutieta, X.; Gomez-Arriaran, I.; Minguillón, Rufino Hernández

doi:10.1016/j.jobe.2022.105331

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…Evaluating hybrid ventilation's long-term maintenance and energy consumption can help identify barriers to widespread implementation. Furthermore, examining renewable energy sources' incorporation, such as solar power or pre-heating [23], [24], into hybrid ventilation systems can improve energy efficiency and environmental sustainability while providing comfortable indoor environments. These studies could refine and optimize hybrid ventilation, facilitate its wider adoption in buildings, and help building owners and facility managers make informed decisions.…”

Section: Environmental and Climate Technologiesmentioning

confidence: 99%

Evaluating the Feasibility of Hybrid Ventilation in Educational Spaces: A Simulation Study in the Basque Country Climate

Rodríguez-Vidal,

Otaegi,

Armengod

2023

Environmental and Climate Technologies

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This paper delves into the examination of indoor comfort in classroom environments and its interplay with ventilation on human wellbeing in scenarios of varying indoor carbon dioxide concentrations. The assessment of these parameters was done according to the provisions outlined in the Spanish national Regulation of Thermal Installations in Buildings (RITE). This study also compares various ventilation strategies, namely natural, mechanical and hybrid ventilation, commenting the pros and cons of each method in the climate of the Basque Country, Spain. To do so, a classroom in the School of Architecture in the Basque Country was modelled in thermal simulation software. Simulations were carried out for full days in 10-minute intervals using Design Builder and considered three different exterior scenarios (a cold day, temperate day, and a warm one) and three different ventilation systems (natural, mechanical with simple flux, and hybrid). Two additional scenarios where added for control, one with no ventilation at all and another with a partial, constant, natural ventilation, like was done during the COVID-19 pandemic. Thus, the natural ventilation option was evaluated under four conditions (windows always closed, windows constantly open 15 %, COVID-19 mode, and windows operated by thermal sensation of the user). The mechanical system evaluated consisted of a constant flux ventilation for IDA 2 IAQ with an air flux of 12.5 L/s per person. The modelled hybrid system consisted in a combination of simple flux mechanical ventilation and open windows and doors under some particular conditions. An occupancy rate of 50 % of the theoretical maximum occupancy of the classroom and a scheduled heating operation were considered. This article presents the CO2 concentration, energetic balance and thermal comfort results obtained in the simulation and compares between the different scenarios. The results showed that the hybrid ventilation system was able to effectively control indoor air quality, providing a healthy and comfortable environment for occupants. The hybrid system demonstrated improved energy efficiency compared to the natural ventilation system, while maintaining an acceptable indoor air quality. Overall, the results of this study highlight the importance of considering hybrid ventilation in educational spaces in the northern Basque Country climate. The study provides valuable insights for building design and operation, especially for renovation of existing schools and educational facilities that lack any means of mechanical ventilation, showing some of the potential for hybrid ventilation to improve indoor air quality and energy efficiency.

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Section: Environmental and Climate Technologiesmentioning

confidence: 99%

Evaluating the Feasibility of Hybrid Ventilation in Educational Spaces: A Simulation Study in the Basque Country Climate

Rodríguez-Vidal,

Otaegi,

Armengod

2023

Environmental and Climate Technologies

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“…As an alternative, scientists have studied Sunspace, which is one way to increase heat efficiency use. Although it is not a novel idea, many authors have still studied it [5][6][7][8][9][10][11][12]. One of them was Ted Kesik [13] who recommended the installation of sunspaces in houses' renovation due to its popularity as Canadian demographics have been shifting throughout the time more and more to aged and retired people.…”

Section: Introductionmentioning

confidence: 99%

A Qualitative Novel Technology to Design an Efficiency Thermal Distribution in a House: A Case Study

Martins¹,

Siqueira²,

Romão³

2023

Preprint

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The study of energy sources has been an awareness of the modern world due to constraints on the current energy worldwide supply chain. The complexity of the theme as well as the consciousness of finite sources also the need of saving energy has become a priority. Although many papers have moved in this direction there is no record of papers studying the variables in a house heating system, which represents the highest energy consumption in many cold countries. This paper explores the energy-saving theme by studying the main variables present in houses’ heating systems in the winter season in cold countries like Canada, Russia, Norway, Iceland, Finland, etc. By using a novel combination of numerical thermal simulation by COMSOLTM and statistical analysis by MiniTabTM , it was possible to design an efficient thermal distribution in a house with the variables of the system by determining their significance and interaction qualitatively.

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“…Their findings reveal that an annual net energy savings increase of up to 48% can be achieved when employing optimal rotary heat exchangers compared to baseline systems [53]. Accurate data on building occupancy and usage play a pivotal role in designing these systems to maximize energy savings and promote sustainability [54].…”

Section: Introductionmentioning

confidence: 99%

Cold Climate Challenges: Analysis of Heat Recovery Efficiency in Ventilation Systems

Prozuments,

Zemitis,

Bulanovs

2023

Energies

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As building energy consumption gains ever-increasing attention worldwide, the focus on addressing it through the examination and optimization of efficient heat recovery solutions continues to intensify. With well-insulated and airtight buildings, the proportion of heating needs attributed to ventilation is growing, leading to the widespread integration and optimization of heat recovery solutions in mechanical ventilation systems. Heat recovery in ventilation is a highly efficient strategy for reducing heat losses and conserving energy. This study involves the investigation of a ventilation unit installed in an apartment situated in Riga, Latvia, as a practical examination of heat recovery system efficiency within the Latvian climate conditions, representing a cold climate region. The objective of this study was to examine the heat recovery efficiency of the ventilation system in the Latvian climate with variable outdoor and exhaust air parameters, given that the dry heat recovery efficiency is different from the actual heat recovery efficiency. The ventilation unit was equipped with a plate heat exchanger at an airflow rate of 105 m3/h. To evaluate heat recovery efficiency, extensive measurements of air temperature and relative humidity were conducted. The collected data was analyzed, employing statistical regression analysis to ensure measurement reliability and assess correlations. The findings indicated a strong correlation between variables such as heat content, moisture content, and sensible air parameters. It was observed that the actual heat recovery efficiency was 6% higher than the calculated dry efficiency, emphasizing the importance of considering real-world conditions in heat recovery assessments. Additionally, regression analysis demonstrated a positive linear correlation with a coefficient of 0.77, highlighting the dependency between actual measurements and the theoretical model. These quantitative outcomes provide essential insights for optimizing heat recovery systems and enhancing energy-efficient ventilation practices, especially in cold climate environments. Moreover, this study highlights the strong correlation between variables such as heat content, moisture content, and sensible air parameters. Findings offer essential insights for optimizing heat recovery systems and enhancing energy-efficient ventilation practices, especially in cold climate environments.

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Use of sunspaces to obtain energy savings by preheating the intake air of the ventilation system: Analysis of its main characteristics in the different Spanish climate zones

Cited by 9 publications

References 19 publications

Evaluating the Feasibility of Hybrid Ventilation in Educational Spaces: A Simulation Study in the Basque Country Climate

Evaluating the Feasibility of Hybrid Ventilation in Educational Spaces: A Simulation Study in the Basque Country Climate

A Qualitative Novel Technology to Design an Efficiency Thermal Distribution in a House: A Case Study

Cold Climate Challenges: Analysis of Heat Recovery Efficiency in Ventilation Systems

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