Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0047
Indra Berzina, Kriss Spalvins
Abstract During food production significant amounts of organic waste is generated annually that can have a negative effect on the environment due to lack of efficient utilisation solutions and insufficient disposal practices. Fungi and their remarkable abilities to produce enzymes can be applied for hydrolysing different types of food waste in simpler sugars. Under optimal conditions, fungal hydrolysis of food waste can be rapid and efficient. Currently, the capacity of this process has only been briefly demonstrated in previous studies. This review describes different practices demonstrating the potential of fungal hydrolysis use for efficient resource management. The focus was on what organisms, waste substrates and parameters as temperature, pH level, have been applied in previous studies as well as glucose recovery yields. It was concluded that food waste can be efficiently hydrolysed and used as a substrate for the downstream production of value-added products using sequential fermentation. The optimal temperature was concluded to be above 45 °C, but the optimal pH level may vary depending on used organism and substate. In future research the possibility of optimizing fungal strains, creating mutants with enhanced enzyme-producing abilities, and application of more GRAS fungal species should be investigated. To conduct valorisation tests on new residues for fungal hydrolysis researchers must collaborate with manufacturers, thus exploring the suitability of a wider range of waste residues for fungal hydrolysis.
{"title":"Fungal Hydrolysis of Food Waste: Review of Used Substrates, Conditions, and Microorganisms","authors":"Indra Berzina, Kriss Spalvins","doi":"10.2478/rtuect-2023-0047","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0047","url":null,"abstract":"Abstract During food production significant amounts of organic waste is generated annually that can have a negative effect on the environment due to lack of efficient utilisation solutions and insufficient disposal practices. Fungi and their remarkable abilities to produce enzymes can be applied for hydrolysing different types of food waste in simpler sugars. Under optimal conditions, fungal hydrolysis of food waste can be rapid and efficient. Currently, the capacity of this process has only been briefly demonstrated in previous studies. This review describes different practices demonstrating the potential of fungal hydrolysis use for efficient resource management. The focus was on what organisms, waste substrates and parameters as temperature, pH level, have been applied in previous studies as well as glucose recovery yields. It was concluded that food waste can be efficiently hydrolysed and used as a substrate for the downstream production of value-added products using sequential fermentation. The optimal temperature was concluded to be above 45 °C, but the optimal pH level may vary depending on used organism and substate. In future research the possibility of optimizing fungal strains, creating mutants with enhanced enzyme-producing abilities, and application of more GRAS fungal species should be investigated. To conduct valorisation tests on new residues for fungal hydrolysis researchers must collaborate with manufacturers, thus exploring the suitability of a wider range of waste residues for fungal hydrolysis.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135319372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The methods of industrial production of gas hydrates are considered, their problems are identified, and a list of factors that are decisive for the intensification of mass exchange processes is outlined. The prospective use of mass transfer devices with a dynamic interfacial surface for the synthesis of gas hydrates is substantiated. A mathematical model of hydrate formation on the surface of a water droplet moving in a gas flow is proposed. Digital solutions for various droplet sizes, velocities, gas pressures, water temperature, gas permeability of gas hydrate, and dynamics of hydrate formation over time were obtained. It was established that the main ways of intensification of the synthesis of gas hydrates are: obtaining smaller water droplets, maintaining the gas temperature at the level of 0 °С, increasing the gas pressure, and increasing the residence time of the droplet in the gas medium. Approximation formulas for calculating quantitative indicators of the influence of various factors on the formation of methane gas hydrate have been obtained. The analysis of the obtained results made it possible to establish promising directions for the optimization of equipment for the synthesis of gas hydrates.
{"title":"Theoretical Foundations of Gas Hydrate Synthesis Intensification","authors":"Bogdan Kutnyi, Anatoliy Pavlenko, Oleksandra Cherednikova","doi":"10.2478/rtuect-2023-0049","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0049","url":null,"abstract":"Abstract The methods of industrial production of gas hydrates are considered, their problems are identified, and a list of factors that are decisive for the intensification of mass exchange processes is outlined. The prospective use of mass transfer devices with a dynamic interfacial surface for the synthesis of gas hydrates is substantiated. A mathematical model of hydrate formation on the surface of a water droplet moving in a gas flow is proposed. Digital solutions for various droplet sizes, velocities, gas pressures, water temperature, gas permeability of gas hydrate, and dynamics of hydrate formation over time were obtained. It was established that the main ways of intensification of the synthesis of gas hydrates are: obtaining smaller water droplets, maintaining the gas temperature at the level of 0 °С, increasing the gas pressure, and increasing the residence time of the droplet in the gas medium. Approximation formulas for calculating quantitative indicators of the influence of various factors on the formation of methane gas hydrate have been obtained. The analysis of the obtained results made it possible to establish promising directions for the optimization of equipment for the synthesis of gas hydrates.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0032
Anna Merlo, Fosca Conti
Abstract Using algae metabolites is considered a current and innovative topic of interest. Among the various applying sectors such as food, manufacturing, and environment, these organisms are also characterized by a high therapeutic potential. The influence of biotic and abiotic factors allows the production of different bioactive compounds, such as carbohydrates, polyphenols, proteins, vitamins, sterols, fatty acids and many others. The algal biomass is investigated to discover and develop new possible therapies and nowadays different properties have been determined, like antioxidant, antiviral, antimicrobial, anti-inflammatory, antidiabetic. Typical examples include the application of algae in diabetes mellitus, which is a disease that is continually spreading throughout Europe and the world. Numerous trials are currently underway to develop innovative and effective treatments, as well as several algae are being investigated in order to gain a deeper understanding of this pathology. In recent studies it has been demonstrated that metabolites such as polyphenols, polysaccharides and pigments, by their inhibitory activity, are capable of reducing blood glucose levels and increasing the amount of insulin.
{"title":"Bioactive Derivatives from Algae: Properties and Applications in Pharmaceuticals","authors":"Anna Merlo, Fosca Conti","doi":"10.2478/rtuect-2023-0032","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0032","url":null,"abstract":"Abstract Using algae metabolites is considered a current and innovative topic of interest. Among the various applying sectors such as food, manufacturing, and environment, these organisms are also characterized by a high therapeutic potential. The influence of biotic and abiotic factors allows the production of different bioactive compounds, such as carbohydrates, polyphenols, proteins, vitamins, sterols, fatty acids and many others. The algal biomass is investigated to discover and develop new possible therapies and nowadays different properties have been determined, like antioxidant, antiviral, antimicrobial, anti-inflammatory, antidiabetic. Typical examples include the application of algae in diabetes mellitus, which is a disease that is continually spreading throughout Europe and the world. Numerous trials are currently underway to develop innovative and effective treatments, as well as several algae are being investigated in order to gain a deeper understanding of this pathology. In recent studies it has been demonstrated that metabolites such as polyphenols, polysaccharides and pigments, by their inhibitory activity, are capable of reducing blood glucose levels and increasing the amount of insulin.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135600996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0053
Jānis Narbuts, Ruta Vanaga
Abstract This paper reviews innovative building envelope technologies that can improve total building energy efficiency and reduce greenhouse gas emissions. The building envelope has a significant impact on energy and thermal performance, making various technologies like phase change materials, aerogel, and active and adaptive systems essential for enhancing the building envelope’s energy efficiency. Phase change materials reduce energy consumption by lowering peak heating and cooling loads, improving thermal comfort. Paraffin wax is considered the most dependable phase change material for building envelopes, as it can decrease energy consumption for heating and cooling. Study shows that active PCM thermal energy storage system can reduce room temperature by 6.8 °C in summer. Aerogel, in comparison, is recognized for its exceptional insulation capabilities and low density that minimize heat transfer and boost thermal insulation in buildings. Silica aerogel’s outstanding feature is its capacity to offer thermal performance that surpasses traditional insulation materials by 2–4 times, thereby delivering substantial energy savings of up to 35 %. Active and adaptive systems, such as smart windows and kinetic facades, enable real-time control of building envelope performance, improving energy efficiency and indoor comfort. Smart windows can lead to annual energy savings up to 35.9 kWh/m 2 compared to traditional windows, and kinetic facades can reduce cooling loads for buildings up to 21 %. The review assesses various adaptive facade solutions for their suitability in diverse climate zones, versatility in application and energy efficiency. Despite the existence of some limitations and challenges, such as high costs and insufficient understanding of their long-term performance, the continuous development and deployment of these technologies can still yield a significant contribution to improving building energy efficiency and mitigating greenhouse gas emissions.
{"title":"Revolutionizing the Building Envelope: A Comprehensive Scientific Review of Innovative Technologies for Reduced Emissions","authors":"Jānis Narbuts, Ruta Vanaga","doi":"10.2478/rtuect-2023-0053","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0053","url":null,"abstract":"Abstract This paper reviews innovative building envelope technologies that can improve total building energy efficiency and reduce greenhouse gas emissions. The building envelope has a significant impact on energy and thermal performance, making various technologies like phase change materials, aerogel, and active and adaptive systems essential for enhancing the building envelope’s energy efficiency. Phase change materials reduce energy consumption by lowering peak heating and cooling loads, improving thermal comfort. Paraffin wax is considered the most dependable phase change material for building envelopes, as it can decrease energy consumption for heating and cooling. Study shows that active PCM thermal energy storage system can reduce room temperature by 6.8 °C in summer. Aerogel, in comparison, is recognized for its exceptional insulation capabilities and low density that minimize heat transfer and boost thermal insulation in buildings. Silica aerogel’s outstanding feature is its capacity to offer thermal performance that surpasses traditional insulation materials by 2–4 times, thereby delivering substantial energy savings of up to 35 %. Active and adaptive systems, such as smart windows and kinetic facades, enable real-time control of building envelope performance, improving energy efficiency and indoor comfort. Smart windows can lead to annual energy savings up to 35.9 kWh/m 2 compared to traditional windows, and kinetic facades can reduce cooling loads for buildings up to 21 %. The review assesses various adaptive facade solutions for their suitability in diverse climate zones, versatility in application and energy efficiency. Despite the existence of some limitations and challenges, such as high costs and insufficient understanding of their long-term performance, the continuous development and deployment of these technologies can still yield a significant contribution to improving building energy efficiency and mitigating greenhouse gas emissions.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135611594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0028
J. Jumintono, Mohammed Abdulkreem Salim, Ming-Hung Lin, Mohammed Hayder Alshalal, Muneam Hussein Ali, Hassan Taher Braiber
Abstract This study focuses on economic modelling of the energy consumption in buildings considering controllable appliances scheduling in stand-alone electrical grids. The economic modelling is implemented via coordination of the energy generation of the renewable energies with controllable appliances by using demand shifting strategy (DSS). On the other side, uncertainty and stochastic modelling of the renewable energies are considered in the optimal coordination. Also, optimal coordination is modelled by multi-criteria problems of the technical and economic indices. Solving of the multi-criteria problem is done by fuzzy and augmented epsilon-constraint methods. To investigate the effectiveness of the proposed model, it is applied on a 25-node test system through defining two scenarios. The obtained results show that modelling the optimal coordination to supply the demand of the grid can increase the efficiency of the system.
{"title":"Multi-Criteria Problems of Energy Consumption in Buildings Considering Technical and Economic Indices","authors":"J. Jumintono, Mohammed Abdulkreem Salim, Ming-Hung Lin, Mohammed Hayder Alshalal, Muneam Hussein Ali, Hassan Taher Braiber","doi":"10.2478/rtuect-2023-0028","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0028","url":null,"abstract":"Abstract This study focuses on economic modelling of the energy consumption in buildings considering controllable appliances scheduling in stand-alone electrical grids. The economic modelling is implemented via coordination of the energy generation of the renewable energies with controllable appliances by using demand shifting strategy (DSS). On the other side, uncertainty and stochastic modelling of the renewable energies are considered in the optimal coordination. Also, optimal coordination is modelled by multi-criteria problems of the technical and economic indices. Solving of the multi-criteria problem is done by fuzzy and augmented epsilon-constraint methods. To investigate the effectiveness of the proposed model, it is applied on a 25-node test system through defining two scenarios. The obtained results show that modelling the optimal coordination to supply the demand of the grid can increase the efficiency of the system.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"7 1","pages":"379 - 390"},"PeriodicalIF":1.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88135900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0011
A. Zandberga, S. Kalniņš, J. Gušča
Abstract As the volume of textile waste steadily increases, mechanical, chemical and biological technologies for textile waste recovery are evolving. Also, the legal framework of the European Union has stated the commitments for promoting the recycling of textile waste in the Member States. So far, however, no decision-making algorithms have been developed for the selection of products recovered from textile waste. Within the present study, a hybrid multi-criteria decision-making algorithm for evaluating textile waste recovered products has been developed applying seven circular economic criteria – ‘Circular economy approach of the technology’, ‘Added-value potential of final product’, ‘Share of textile waste in total waste feedstock’, ‘Diversity of textile mix suitable for specific technology’, ‘Pre-treatment of waste feedstock’, ‘Recovery potential’ and ‘Maturity of a recovery technology’. The weighting of the criteria was determined by eight waste management experts. The results of the expert-based criteria evaluation show that the most important criteria are ‘Added-value potential of final product’ and ‘Circular economy approach of the technology’. The developed decision-making methodology has been adapted to nine textile waste recovered products – compost, refuse-derived fuel, ethanol, glucose, building insulation material from cement and textile waste mix, building insulation material from denim textile waste, terephthalic acid, recovered cotton and recovered polyester. The multi-criteria, decision-making ranking of the products textile shows that the highest potential for products recovered from textile waste is for glucose and terephthalic acid, while the lowest – for ethanol, compost and refuse-derived fuel.
{"title":"Decision-making Algorithm for Waste Recovery Options. Review on Textile Waste Derived Products","authors":"A. Zandberga, S. Kalniņš, J. Gušča","doi":"10.2478/rtuect-2023-0011","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0011","url":null,"abstract":"Abstract As the volume of textile waste steadily increases, mechanical, chemical and biological technologies for textile waste recovery are evolving. Also, the legal framework of the European Union has stated the commitments for promoting the recycling of textile waste in the Member States. So far, however, no decision-making algorithms have been developed for the selection of products recovered from textile waste. Within the present study, a hybrid multi-criteria decision-making algorithm for evaluating textile waste recovered products has been developed applying seven circular economic criteria – ‘Circular economy approach of the technology’, ‘Added-value potential of final product’, ‘Share of textile waste in total waste feedstock’, ‘Diversity of textile mix suitable for specific technology’, ‘Pre-treatment of waste feedstock’, ‘Recovery potential’ and ‘Maturity of a recovery technology’. The weighting of the criteria was determined by eight waste management experts. The results of the expert-based criteria evaluation show that the most important criteria are ‘Added-value potential of final product’ and ‘Circular economy approach of the technology’. The developed decision-making methodology has been adapted to nine textile waste recovered products – compost, refuse-derived fuel, ethanol, glucose, building insulation material from cement and textile waste mix, building insulation material from denim textile waste, terephthalic acid, recovered cotton and recovered polyester. The multi-criteria, decision-making ranking of the products textile shows that the highest potential for products recovered from textile waste is for glucose and terephthalic acid, while the lowest – for ethanol, compost and refuse-derived fuel.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"45 1","pages":"137 - 149"},"PeriodicalIF":1.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90739947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0038
Alois Resch, Harald Dehner
Abstract Urban areas are increasingly supplied by district heating networks (DHN) because this technology is reliable, provides easy handling for the customer and contributes to the required reduction of greenhouse gas emissions if it is operated from renewable sources. Waste heat from the industrial sector can serve as such, however, industrial plants are often not in the meaningful range of DHN, as they are mostly located in the periphery. For this reason, the application of mobile thermal energy storages (M-TES) is investigated by the present research work. M-TES systems are technically capable of exchanging heat between a DHN and heat sources or heat sinks, as previous studies have shown, but economic viability could not be reached with former energy prices. However, geopolitical incidents of 2022 resulted in massive fluctuations on the energy markets and unpredicted price increases. Therefore, this paper provides an updated analysis of M-TES, considering the premises of 2022. An economic model according to VDI2067 was developed for calculating the costs of transported heat for different storage technologies and materials. Moreover, transportation by a Diesel driven truck was compared to an electric driven one. The updated analysis yielded economic feasibility for specific M-TES configurations, achieving minimum heat costs of € 89.5 per MWh. This is equivalent to a reduction of 40.3 % related to the prices of conventional district heating in Austria by end of 2022.
{"title":"Economic Analysis of Mobile Thermal Energy Storages as Complement to District Heating","authors":"Alois Resch, Harald Dehner","doi":"10.2478/rtuect-2023-0038","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0038","url":null,"abstract":"Abstract Urban areas are increasingly supplied by district heating networks (DHN) because this technology is reliable, provides easy handling for the customer and contributes to the required reduction of greenhouse gas emissions if it is operated from renewable sources. Waste heat from the industrial sector can serve as such, however, industrial plants are often not in the meaningful range of DHN, as they are mostly located in the periphery. For this reason, the application of mobile thermal energy storages (M-TES) is investigated by the present research work. M-TES systems are technically capable of exchanging heat between a DHN and heat sources or heat sinks, as previous studies have shown, but economic viability could not be reached with former energy prices. However, geopolitical incidents of 2022 resulted in massive fluctuations on the energy markets and unpredicted price increases. Therefore, this paper provides an updated analysis of M-TES, considering the premises of 2022. An economic model according to VDI2067 was developed for calculating the costs of transported heat for different storage technologies and materials. Moreover, transportation by a Diesel driven truck was compared to an electric driven one. The updated analysis yielded economic feasibility for specific M-TES configurations, achieving minimum heat costs of € 89.5 per MWh. This is equivalent to a reduction of 40.3 % related to the prices of conventional district heating in Austria by end of 2022.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135952692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract 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.
{"title":"Evaluating the Feasibility of Hybrid Ventilation in Educational Spaces: A Simulation Study in the Basque Country Climate","authors":"Iñigo Rodríguez-Vidal, Jorge Otaegi, Unai Armengod","doi":"10.2478/rtuect-2023-0039","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0039","url":null,"abstract":"Abstract 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.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136203622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The world’s leading indoor air quality guidelines provide for the identification of certain parameters with a specific limit value based on the latest empirical measurements, however, most of them do not have legal coverage and are voluntary. This leads to unequal assessment of indoor air quality, because there is an identifiable difference between the limit values set out in the various guidelines. And these values would be related to the results obtained during the experimental activities of the application of the specific parameters and the interpretation of their effects on human health. The aim of this IAQ guideline and IAQ certification review was to develop IAQ label for Nordic countries and to find gaps the legislation established by the Latvian government. The development of indoor air quality labels provides an opportunity to maintain and promote the optimal functionality of human physiological processes and the sustainability of the building.
{"title":"Indoor Air Quality Guidelines Connection to IAQ Certification and Labelling Process","authors":"Klinta Luīze Sprūdža, Aneka Kļaviņa, Buka Bērziņa, Rūta Kauce, Ž. Martinsone","doi":"10.2478/rtuect-2023-0003","DOIUrl":"https://doi.org/10.2478/rtuect-2023-0003","url":null,"abstract":"Abstract The world’s leading indoor air quality guidelines provide for the identification of certain parameters with a specific limit value based on the latest empirical measurements, however, most of them do not have legal coverage and are voluntary. This leads to unequal assessment of indoor air quality, because there is an identifiable difference between the limit values set out in the various guidelines. And these values would be related to the results obtained during the experimental activities of the application of the specific parameters and the interpretation of their effects on human health. The aim of this IAQ guideline and IAQ certification review was to develop IAQ label for Nordic countries and to find gaps the legislation established by the Latvian government. The development of indoor air quality labels provides an opportunity to maintain and promote the optimal functionality of human physiological processes and the sustainability of the building.","PeriodicalId":46053,"journal":{"name":"Environmental and Climate Technologies","volume":"840 1","pages":"28 - 39"},"PeriodicalIF":1.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76961234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.2478/rtuect-2023-0004
V. Kirsanovs, F. Romagnoli, A. Piščika, A. Safronova, Maksims Feofilovs
Abstract Transport consumes around one-third of Latvia’s final energy demand being the largest sector that produces greenhouse gas emissions. In Latvia, in the year 2019, the share of renewable energy sources in the transport sector was only 4.8 % of the total gross consumption with a target of 7 % of not food-based biofuels by 2030. To tackle climate change problems, one significant task is reducing pollution in the transport sector by substituting fossil with biomass-based fuels. The goal of this study is to develop a methodology for evaluating biofuel production in Latvia considering economic, social, environmental, and technological aspects. A total of 16 specific criteria were selected for biofuel comparison. The methodology is based on a combination of two quantitative approaches, namely Life Cycle Assessment and Multi-Criteria Analysis. The proposed method aims to identify the most sustainable biofuel in Latvia according to a set of specific indicators.
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