Building and Environment最新文献

Characterization and exposure assessment of indoor microplastics in hospital indoor settled dust: First insides from India

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-22 DOI: 10.1016/j.buildenv.2025.113065

Nisarg Mehta , Barbara Kozielska , Jagniyant Lunagaria , K.D. Ladva

{"title":"Characterization and exposure assessment of indoor microplastics in hospital indoor settled dust: First insides from India","authors":"Nisarg Mehta , Barbara Kozielska , Jagniyant Lunagaria , K.D. Ladva","doi":"10.1016/j.buildenv.2025.113065","DOIUrl":"10.1016/j.buildenv.2025.113065","url":null,"abstract":"<div><div>Microplastics (MPs) in indoor environments pose emerging health risks, yet healthcare facilities remain understudied. This study characterizes MPs in settled dust from public and private hospitals in Rajkot, India, assessing quantification, polymer identification, and exposure assessment for patients and staff. Dust samples were collected from high-traffic (e.g., corridors, OPDs) and controlled zones (e.g., ICUs), followed by organic digestion, density separation, optical microscopy and FTIR analysis. Results revealed mean concentrations of 65.0 ± 20.3 MP/g (Hospital 1) and 80.0 ± 38.5 MP/g (Hospital 2), with fibers dominating (52–69 %). Red and blue MPs were most prevalent, linked to synthetic textiles and medical consumables. Polymer analysis identified polyethylene terephthalate (PET) and polyethylene (PE) as dominant, underscores hospitals’ reliance on single-use plastics and synthetic textiles. Size distribution highlighted 200–500 µm particles (27–37 %), though smaller MPs (<50 µm) were underrepresented. Estimated Daily Intake (EDI) for infants reached 0.82 MPs/kg/day in high-traffic zones, emphasizing vulnerability. Statistical analyses (Kruskal-Wallis, PCA) revealed spatial homogenization but institution-specific accumulation patterns. This study provides the first baseline data on MPs in Indian hospitals, future work should employ advanced techniques and assess long-term health impacts.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113065"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating convective heat transfer coefficients of building surfaces under different thermal stratifications with non-isothermal inflow boundary conditions

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-22 DOI: 10.1016/j.buildenv.2025.113059

Yezhan Li , Tsubasa Okaze

{"title":"Investigating convective heat transfer coefficients of building surfaces under different thermal stratifications with non-isothermal inflow boundary conditions","authors":"Yezhan Li , Tsubasa Okaze","doi":"10.1016/j.buildenv.2025.113059","DOIUrl":"10.1016/j.buildenv.2025.113059","url":null,"abstract":"<div><div>The convective heat transfer coefficient (CHTC) on building surfaces is crucial for understanding the thermal environment in urban areas, influencing building energy consumption and thermal performance. While previous studies have primarily focused on neutral inflow conditions and windward surfaces, the effects of non-isothermal inflows and surface-specific CHTC distributions remain insufficiently explored. This study investigates the CHTC distributions on building surfaces under different thermal stratifications using large-eddy simulation (LES). Eight inflow profiles, including one neutral and seven unstable cases, were generated via precursor simulations and applied to a 1:1:2 isolated building model. The results revealed that temperature differences have negligible effects under neutral inflow conditions but significantly influence CHTC distributions under non-isothermal inflow conditions, especially on lateral and leeward surfaces. A strong linear correlation was observed between CHTC and velocity for windward and top surfaces, consistent with findings under neutral inflow conditions, whereas lateral and leeward surfaces demonstrated greater sensitivity to temperature effects. The study develops novel correlations of CHTC with velocity, and normalized temperature differences for all building surfaces. Additionally, it provides relationships between the windward surface and other surfaces, showing that the lateral surface CHTC is approximately 85 % of the windward surface CHTC, the top surface CHTC is nearly equal to it, and corrections are required for the leeward surface. These findings contribute to improved accuracy in urban heat transfer modeling and more effective building energy efficiency evaluations.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113059"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acoustic performance of coffee waste/polylactic acid composite microperforated panels for noise control in cafe spaces

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-22 DOI: 10.1016/j.buildenv.2025.113062

Seong Taek Kang, Ji Yong Choi, Young Uk Kim, Sumin Kim

{"title":"Acoustic performance of coffee waste/polylactic acid composite microperforated panels for noise control in cafe spaces","authors":"Seong Taek Kang, Ji Yong Choi, Young Uk Kim, Sumin Kim","doi":"10.1016/j.buildenv.2025.113062","DOIUrl":"10.1016/j.buildenv.2025.113062","url":null,"abstract":"<div><div>Excessive noise exposure poses significant health risks such as cognitive impairment, cardiovascular diseases, and sleep disturbances, highlighting the need for effective noise control strategies. This study examines the acoustic performance of microperforated panels made from polylactic acid (PLA) and coffee waste/PLA composite (CWPLA) using three-dimensional printing. The CWPLA panels achieved a peak sound absorption coefficient of 0.90 at 800 Hz, outperforming the PLA panels. Reverberation time (RT) analysis conducted with Odeon Acoustics Software revealed that the CWPLA panels reduced reverberation by 0.59 s at 1000 Hz with 50 % ceiling coverage, whereas the PLA panels reduced reverberation by 0.72 s at 500 Hz under similar coverage conditions. Full ceiling coverage further improved performance by reducing RT across all frequency ranges. PLA panels were more effective for low to mid frequencies, such as speech, whereas PLA panels excelled in high-frequency environments with machinery or heating, ventilation, and air conditioning systems. The enhanced performance of CWPLA panels was attributed to their increased porosity and improved internal damping provided by the integrated coffee waste fibers. Additionally, increasing the cavity depth from 10 mm to 20 mm further enhanced sound absorption by promoting Helmholtz resonance. These findings demonstrate that CWPLA panels provide effective noise control while promoting sustainability, as they support circular economic principles by converting industrial waste into high-performance materials.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113062"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective grid scale of large-eddy simulations in various advection schemes using airflow around 1:1:2 block model

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-22 DOI: 10.1016/j.buildenv.2025.113060

T. Tong , T. Okaze , N. Ikegaya

{"title":"Effective grid scale of large-eddy simulations in various advection schemes using airflow around 1:1:2 block model","authors":"T. Tong , T. Okaze , N. Ikegaya","doi":"10.1016/j.buildenv.2025.113060","DOIUrl":"10.1016/j.buildenv.2025.113060","url":null,"abstract":"<div><div>Large-eddy simulation (LES) is widely used for predicting turbulent flows. The accuracy highly depends on the reproduction of resolved grid scale turbulences determined by grid resolution and numerical discretization. However, the actual grid scale is not specified in models except for designing the numerical grid. Therefore, this study explicitly determines the effective grid scale in LES by comparing power spectral densities (PSDs) of LES and wind-tunnel experiment (WTE) data for the airflow around a 1:1:2 building model. A frequency-domain filtering approach is used to determine the cut-off length scale, analyzing various advection schemes. Results show that numerical diffusion significantly impacts the effective grid scale, with upwind schemes leading to larger cut-off lengths due to excessive dissipation of high-frequency turbulence structures. Spatial and statistical analyses reveal that the resolution of grid scale turbulence varies across different flow regions, particularly in areas of strong flow separation. These findings highlight the importance of selecting appropriate advection schemes to reproduce the grid scale turbulence in LES specified by numerical mesh. The concept of the effective grid scale provides a refined metric for assessing LES resolution, contributing to better turbulence modeling in wind engineering.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113060"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance and indoor environment study of convective-radiant coupled terminals: Insights from start-up and steady-state control modes

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-21 DOI: 10.1016/j.buildenv.2025.113058

Zixu Yang , Mingbin Yang , Bin Luo , Yichi Zhang , Wenxing Shi

{"title":"Performance and indoor environment study of convective-radiant coupled terminals: Insights from start-up and steady-state control modes","authors":"Zixu Yang , Mingbin Yang , Bin Luo , Yichi Zhang , Wenxing Shi","doi":"10.1016/j.buildenv.2025.113058","DOIUrl":"10.1016/j.buildenv.2025.113058","url":null,"abstract":"<div><div>The efficient design of heating terminals that ensure thermal comfort is critical for advancing the built environment. Convective/radiant (C/R) coupled terminals offer a promising solution by combining the rapid response of convective heating with the enhanced comfort provided by radiant systems. However, current research has primarily focused on development and manufacturing, with limited investigation into operational steady-state and start-up control strategies. This study investigates the indoor environmental and thermal performance of C/R terminals in a controlled climate chamber. Experiments were conducted to assess multiple start-up modes, including convective-only heating, C/R with fixed condensing temperature, variable frequency, and low-temperature start-up mode. Different steady-state control strategies were also analyzed, focusing on return air temperature, central air temperature, central and local operative temperature controls. Key findings indicate that in variable frequency mode, heating output decreased by 11.1 %, while energy efficiency improved by 4.1 % compared to the fixed condensing temperature mode. The time required to reach the set-point temperature increased by 10 min, with a time-matching coefficient of 0.932 of fixed condensing temperature mode, reflecting efficient heat output utilization. Compared to convective-only mode, the C/R terminal demonstrated superior performance during the start-up stage in both time response and efficiency. Additionally, local operative temperature control resulted in a 16.5 % reduction in heat output compared to central operative temperature control. This study provides actionable insights into optimizing operational control strategies of C/R terminals, highlighting their potential to improve indoor comfort and energy performance in intermittent heating scenarios.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113058"},"PeriodicalIF":7.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Odor emissions from key vehicle interior components using combinatorial experimental design

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-21 DOI: 10.1016/j.buildenv.2025.113055

Guanqiong Wei , Yiming Xiao , Jing Wang , Xudong Yang

{"title":"Odor emissions from key vehicle interior components using combinatorial experimental design","authors":"Guanqiong Wei , Yiming Xiao , Jing Wang , Xudong Yang","doi":"10.1016/j.buildenv.2025.113055","DOIUrl":"10.1016/j.buildenv.2025.113055","url":null,"abstract":"<div><div>This study used a combinatorial approach with vehicle interior components to bridge perceived odors and volatile organic compound (VOC) emissions, capturing real-world interactions like odor masking. A dynamic source-tracing experimental design sequentially introduced five key interior components (seats, carpets, headliners, door panels, and weatherstrips) into controlled chambers according to their odor intensity. Odor profiles and VOC emissions were characterized via panel evaluations, odor activity value (OAV) analysis, and chemical mass balance (CMB) modeling. Results showed that seats and door panels were the dominant contributors shaping the overall odor type. Adding a seat increased the average odor intensity (OI) by 0.6 to 1.1 and odor similarity by 28 % to 40 %. The addition of a door panel increased the similarity from 12 % to 48 %. In contrast, weatherstrips did not significantly influence the odor character, their distinct smell was masked by the other components, even though their presence boosted overall odor intensity. OAV screening identified 11 key odor-related substances, including butanal, nonanal, and decanal. The CMB analysis revealed that door panels, seats, and weatherstrips contributed 58 %, 26 %, and 16 % of the odor-related substances, respectively. The carpet and headliner did not result in noticeable odor changes, and the carpet occasionally exhibited a negative source effect. These findings contribute to the understanding of in-vehicle odor sources and provide insights into the reduction of unpleasant odors through targeted materials and manufacturing adjustments.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113055"},"PeriodicalIF":7.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction and optimization of daylight performance of AI-generated residential floor plans

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-21 DOI: 10.1016/j.buildenv.2025.113054

Xiao Hu , Hao Zheng , Dayi Lai

{"title":"Prediction and optimization of daylight performance of AI-generated residential floor plans","authors":"Xiao Hu , Hao Zheng , Dayi Lai","doi":"10.1016/j.buildenv.2025.113054","DOIUrl":"10.1016/j.buildenv.2025.113054","url":null,"abstract":"<div><div>The integration of artificial intelligence (AI) into architectural design, particularly in generating floor plans, has the potential to significantly streamline the design process. However, most AI-generated floor plans focus primarily on form and spatial arrangement, often neglecting essential performance evaluations due to their output being rendered as images without necessary geometries and properties for effective physical modeling analysis. To address this limitation, we propose a novel methodology that combines diffusion models with Generative Adversarial Networks (GANs) to simultaneously generate and evaluate architectural floor plans. We fine-tuned a Low-Rank Adaptation (LoRA) model on a dataset to create residential floor plans, while the GAN model facilitates rapid predictions of daylight performance. Our results demonstrate that the diffusion model can generate a variety of floor plans, exceeding the types included in the training set. The GAN model provided accurate assessments of daylight performance by deviating no more than 5 % from ground truth, achieving a mean squared error (MSE) as low as 4.2, and a structural similarity index (SSIM) reaching 0.98 on the test set. The proposed workflow operates 267 times faster than traditional modeling-simulation workflows. This integrated approach equips architects with an efficient and reliable tool for early-stage design decisions, enhancing the effectiveness of AI-driven architectural workflows.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113054"},"PeriodicalIF":7.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The mediating effect of microclimate in the impacts of roadside vegetation barriers on air pollution in pedestrian spaces

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-20 DOI: 10.1016/j.buildenv.2025.113052

Qianqian Sheng , Cheng Zhang , Yu Huang , Chunyun Jia , Congzhe Liu , Anqi Dai , Zunling Zhu , Zhengwei Huang

{"title":"The mediating effect of microclimate in the impacts of roadside vegetation barriers on air pollution in pedestrian spaces","authors":"Qianqian Sheng , Cheng Zhang , Yu Huang , Chunyun Jia , Congzhe Liu , Anqi Dai , Zunling Zhu , Zhengwei Huang","doi":"10.1016/j.buildenv.2025.113052","DOIUrl":"10.1016/j.buildenv.2025.113052","url":null,"abstract":"<div><div>As urbanization accelerates, the combined effects of urban heat island and traffic-related pollution have worsened the deterioration of thermal environments and the accumulation of airborne pollutants in pedestrian spaces, significantly threatening public health. While vegetation barriers have shown promise as a cost-effective intervention, the unclear mechanisms of their interaction in pollutant removal and microclimate regulation currently limit the optimization of their ecological benefits. We selected ten sampling points along five pedestrian-heavy roads in Nanjing to monitor air temperature, air humidity, and concentrations of PM<sub>2.5</sub>, PM<sub>10</sub>, and NO<sub>2</sub>, while measuring vegetation structural parameters (Sky View Factor and shelterbelt porosity at different heights). Our results indicated that vegetation barriers with low Sky View Factor, low shelterbelt porosity at 8 ∼ 16 m, and high shelterbelt porosity at 0 ∼ 4 m were more effective in reducing pollutant and enhancing localized cooling and humidifying effects. The influence of vegetation configurations on pollutant reduction and microclimate regulation varied significantly across different vertical layers. Structural Equation Modeling further revealed that the reduction of PM<sub>2.5</sub> primarily achieved through direct effects of the vegetation barrier, the reduction of PM<sub>10</sub> relying entirely on indirect effects, and the reduction of NO<sub>2</sub> being influenced by both direct and indirect effects, where cooling positively facilitates NO<sub>2</sub> reduction but negatively impacts PM<sub>10</sub> reduction. This study highlights the importance of optimizing shelterbelt porosity and considering microclimate effects in urban greening designs to enhance roadside vegetation barrier performance and provide guidance for sustainable urban green practices.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113052"},"PeriodicalIF":7.1,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-dimensional Monte Carlo simulation of source-specific risks from PM2.5-bound polycyclic aromatic hydrocarbons in indoor and outdoor school environments

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-18 DOI: 10.1016/j.buildenv.2025.113050

Jelena Obradović , Jelena Vesković , Milena Jovašević-Stojanović , Milan Obradović , Antonije Onjia

{"title":"Two-dimensional Monte Carlo simulation of source-specific risks from PM2.5-bound polycyclic aromatic hydrocarbons in indoor and outdoor school environments","authors":"Jelena Obradović , Jelena Vesković , Milena Jovašević-Stojanović , Milan Obradović , Antonije Onjia","doi":"10.1016/j.buildenv.2025.113050","DOIUrl":"10.1016/j.buildenv.2025.113050","url":null,"abstract":"<div><div>Probabilistic health risks in school environments from fine particulate matter (PM<sub>2.5</sub>) bound polycyclic aromatic hydrocarbons (PAHs) emitted from specific sources were evaluated. The sixteen priority PAHs were examined in PM<sub>2.5</sub> samples collected indoors and outdoors in the heating and non-heating seasons. The average concentrations of total PAHs (ΣPAHs) bound to PM<sub>2.5</sub> were lower indoors than outdoors, with ΣPAH concentrations being notably higher in the heating season (11.1 ± 2.3 ng/m<sup>3</sup> indoors and 12.5 ± 4.2 ng/m<sup>3</sup> outdoors) than in the non-heating season (8.2 ± 1.6 ng/m<sup>3</sup> indoors and 9.9 ± 3.0 ng/m<sup>3</sup> outdoors). Acenaphthene, benzo[b]fluoranthene, and benzo[k]fluoranthene were the most abundant PAHs. Diagnostic PAH ratios and positive matrix factorization indicated that vehicular emissions and natural gas, biomass, and coal combustion were the major sources of PAHs during the heating season, whereas traffic was the primary PAH source in the non-heating season. The average total carcinogenicity, estimated using benzo[a]pyrene (BaP) equivalents, was 0.99 ng/m<sup>3</sup> indoors and 1.1 ng/m<sup>3</sup> outdoors for ΣPAHs, whereas BaP and dibenz[a,h]anthracene were the highest risk contributors. Two-dimensional Monte Carlo simulation revealed the average lifetime lung cancer risk (LLCR) due to exposure to PAHs in school environments of 8.65 × 10<sup>−5</sup> indoors and 9.63 × 10<sup>−5</sup> outdoors. In addition, the 95th percentile of the LLCR was found to be 8.86 × 10<sup>−5</sup> for indoors and 9.91 × 10<sup>−5</sup> for outdoors. These results suggest that the inhalation exposure of students to PAHs bound to PM<sub>2.5</sub> poses potential health risks but remains below the serious risk level.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113050"},"PeriodicalIF":7.1,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wavelet analysis and sinusoidal modelling of environmental variables in a weaned piglet farm

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-18 DOI: 10.1016/j.buildenv.2025.113049

Maria D. Fernandez , Manuel R. Rodriguez , Xose R. Fdez-Vidal , Roberto Besteiro

{"title":"Wavelet analysis and sinusoidal modelling of environmental variables in a weaned piglet farm","authors":"Maria D. Fernandez , Manuel R. Rodriguez , Xose R. Fdez-Vidal , Roberto Besteiro","doi":"10.1016/j.buildenv.2025.113049","DOIUrl":"10.1016/j.buildenv.2025.113049","url":null,"abstract":"<div><div>Characterizing the indoor environment of livestock buildings is particularly relevant because of its effects on production welfare and GHG emissions. However, the large number of variables involved and the complexity of the processes governing the evolution of indoor environment hinder the identification of the interrelation between environmental variables. This study analyzed outdoor temperature, animal activity and CO<sub>2</sub> and NH<sub>3</sub> concentrations in a weaned piglet building with mechanical ventilation during a complete breeding cycle. The analysis combined a traditional 3-harmonic cosine model with two innovative methods in this area, specifically, continuous wavelet transform (CWT) and wavelet coherence. The results reveal an inverse evolution of outdoor temperature and animal activity, with diurnal peaks, and of outdoor temperature and gas concentrations, with nocturnal peaks and a dominant period of 24 h. Outdoor temperature and CO<sub>2</sub> concentrations show a daily pattern with one distinct maximum and one distinct minimum, whereas animal activity and NH<sub>3</sub> concentrations present two maximum values. A particularly strong correlation is found between outdoor temperature and CO<sub>2</sub> concentrations, with an 11 h shift between series. The relationship between NH<sub>3</sub> concentrations and outdoor temperature is weaker, but the phase difference between both variables is in accordance with the shift for CO<sub>2</sub>. The analysis reveals that the animals become active at dawn, 1h20’ before the increase in diurnal temperatures. Continuous Wavelet Transform and wavelet coherence enhance traditional harmonic analysis by providing a more detailed perspective of how the environmental study variables evolve and interrelate over time.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113049"},"PeriodicalIF":7.1,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0