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Aerosol transmission in queuing and dining scenarios in canteens and the effectiveness of control measures 食堂排队用餐场景的气溶胶传播及防控措施效果
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-27 DOI: 10.1080/19401493.2023.2193559
Jinjun Ye, Zhengtao Ai, Yufan Chang
This study investigates the aerosol transmission in queuing and dining scenarios in canteens and explores the effectiveness of control measures. An improved Wells-Riley equation is adopted to calculate the infection risk. The dilution of exhaled aerosols is difficult in the crowded queuing scenario, where the replacement of queuing positions increases the cross-infection risk. The highest infection risk is 1.16% and 1.08% for the linear-queue and cross-queue condition, respectively. Shortening the queuing duration, increasing the separation distance, and wearing masks can considerably reduce the infection risk. In the dining scenario, the effect of increasing ACH is limited on reducing the local concentration. An exhaust vent installed close to the top of the partition can effectively remove the local high-concentration aerosols. Intermittent occupation of a seat can considerably reduce the transmission risk between the consecutive dinners taking that seat. These findings should contribute to improved control of infectious transmission in canteens.
本研究调查了食堂排队和用餐场景下的气溶胶传播情况,并探讨了控制措施的有效性。采用改进的Wells-Riley方程计算感染风险。在拥挤排队的情况下,很难稀释呼出的气溶胶,因为排队位置的更换增加了交叉感染的风险。线性队列和交叉队列感染风险最高,分别为1.16%和1.08%。缩短排队时间,增加隔离距离,佩戴口罩,可大大降低感染风险。在用餐情景中,增加乙酰胆碱对降低局部浓度的作用有限。靠近隔板顶部的排气孔可有效清除局部高浓度气溶胶。间歇性占用一个座位可以大大降低连续用餐之间的传播风险。这些发现将有助于加强对食堂传染病传播的控制。
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引用次数: 0
An open-source framework for simulation-based testing of buildings control strategies 一个开源框架,用于基于模拟的建筑物控制策略测试
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-22 DOI: 10.1080/19401493.2023.2191220
Sen Huang, Robert Lutes, Cary A. Faulkner, Draguna L. Vrabie, S. Katipamula, W. Zuo
This paper presents a simulation framework for evaluating building control strategies (BCSs), developed with VOLTTRON, an opensource platform that integrates data, devices, and systems for sensing and control applications, and is based on co-simulation interfaces. It realizes an integrated environment for both testing and deploying BCSs, thereby eliminating the need for having a dedicated implementation of BCS for testing. For the first time, this framework provides critical functionalities, including scalable communication management and time-drive simulation advance, i.e., advancing the simulation based on clock time. We applied this framework to evaluating two BCSs from ASHRAE Guideline 36-2008 and ASHRAE Standard 90.1-2019. The evaluation results show that those BCSs primarily benefit the heating operation by reducing gas usage but yield insignificant savings in electricity consumption. The results also emphasize the importance of tuning the parameters of the BCSs to achieve better performances.
本文提出了一个用于评估建筑控制策略(BCSs)的仿真框架,该框架由voltron开发,voltron是一个基于联合仿真接口的开源平台,集成了用于传感和控制应用的数据、设备和系统。它实现了用于测试和部署BCS的集成环境,从而消除了为测试使用专门的BCS实现的需要。该框架首次提供了关键功能,包括可扩展的通信管理和时间驱动仿真推进,即基于时钟时间推进仿真。我们将该框架应用于评估ASHRAE指南36-2008和ASHRAE标准90.1-2019中的两个bcs。评估结果表明,这些bcs主要通过减少燃气使用而有利于加热操作,但在电力消耗方面的节省微不足道。结果还强调了调整bcs参数以获得更好性能的重要性。
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引用次数: 0
A hybrid multiple sensor fault detection, diagnosis and reconstruction algorithm for chiller plants 一种混合多传感器冷水机组故障检测、诊断与重建算法
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-22 DOI: 10.1080/19401493.2023.2189303
K. Fong, C. K. Lee, M. Leung, Y. Sun, Guangya Zhu, Hyo Baek, X. J. Luo, Tim Ka, Kui Lo, Hetty Sin, Ying Leung
In a chiller plant, primary or critical sensors are used to control the system operation while secondary sensors are installed to monitor the performance/health of individual equipment. Current sensor fault detection and diagnosis (SFDD) approaches are not applicable to secondary sensors which usually are not involved in the system control. Consequently, a hybrid multiple sensor fault detection, diagnosis and reconstruction (HMSFDDR) algorithm for chiller plants was developed. Machine learning and pattern recognition were used to predict the primary sensor faults through the comparison of the weekly performance curves. With the primary sensor signals reconstructed, the secondary sensor faults were estimated based on mass and energy balance. By applying the algorithm with various logged plant data and comparison with site checking results, a maximum of 75% effectiveness could be achieved. The merits of the present approach were further justified through off-site sensor testing which reinforced the usefulness of proposed HMSFDDR algorithm.
在冷水机组中,主要或关键传感器用于控制系统运行,而次要传感器用于监测单个设备的性能/健康状况。当前传感器故障检测与诊断方法不适用于通常不参与系统控制的二次传感器。在此基础上,提出了一种多传感器混合故障检测、诊断与重建算法。通过每周性能曲线的比较,采用机器学习和模式识别技术预测传感器的主要故障。在对主传感器信号进行重构的基础上,基于质量和能量平衡对副传感器故障进行估计。通过将该算法应用于各种植物记录数据,并与现场检查结果进行比较,最高可达到75%的有效性。通过非现场传感器测试进一步证明了该方法的优点,增强了HMSFDDR算法的有效性。
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引用次数: 2
Experimental validation of a numerical model for a sand-based seasonal thermal energy storage 砂基季节性蓄热数值模型的实验验证
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-19 DOI: 10.1080/19401493.2023.2191338
Rebecca I. Pinto, I. Beausoleil-Morrison
A research facility with solar thermal collector system and a water-saturated, sand-based seasonal thermal energy storage (SSTES) is used to provide space heating and domestic hot water heating to homes in cold climates. A 3D finite difference model of the heat transfer in and around the SSTES is presented and validated with measured data. The SSTES has lost moisture over time, making its thermal properties difficult to estimate. Additionally, the experimental data shows the SSTES losing heat at twice the expected rate, potentially due to incorrect thermal parameters from the manufacturer and the SSTES insulation being damaged or degraded. The final numerical model was validated over a 163-day period where energy was being injected into and extracted from the SSTES. It was found that the seasonal performance of the SSTES could be predicted by a conduction-only heat transfer model, and this model is suitable to be included in BPS tools.
研究设施包括太阳能集热器系统和水饱和沙基季节性热能储存(SSTES),用于为寒冷气候下的家庭提供空间供暖和生活热水供暖。建立了SSTES内部和周围传热的三维有限差分模型,并用实测数据进行了验证。随着时间的推移,SSTES失去了水分,使其热性能难以估计。此外,实验数据显示,SSTES的失热率是预期的两倍,可能是由于制造商提供的热参数不正确以及SSTES绝缘被损坏或退化。最后的数值模型在163天的周期内得到验证,该周期内能量被注入SSTES并从SSTES中提取。研究结果表明,单传导传热模型可以很好地预测SSTES的季节特性,该模型适合纳入BPS工具。
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引用次数: 0
The challenges of using live-streamed data in a predictive digital twin 在预测性数字孪生中使用直播数据的挑战
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-15 DOI: 10.1080/19401493.2023.2187463
R. Ward, Ruchi Choudary, Melanie Jans Singh, F. Roumpani, T. Lazauskas, May Yong, Nicholas Barlow, M. Hauru
A key component of a digital twin is the monitored data, communicated from the physical system to the virtual representation, for visualization and simulation. Yet little attention has been paid to the practicalities of working with live-streamed data. Strategies are required for providing continuous access and storage, for processing data of indeterminate quality, and for ensuring long-term sustainability of data communication systems. This paper describes design of the data communication infrastructure, 3D visualization and data interpretation tools, and model development and implementation, for an operational digital twin. Conclusions are drawn pertaining to the informativeness of streamed data, key for successful digital twin development and operation. The paper highlights the need for further research into techniques for ensuring data quality and forecasting efficacy. Digital twins operated commercially are rarely described in detail; the discussion provides a basis for future collaborative development of a consistent operational and interactive framework.
数字孪生的一个关键组成部分是监控数据,从物理系统传输到虚拟表示,用于可视化和仿真。然而,很少有人关注处理直播数据的实用性。需要制定战略,以提供连续的访问和存储,处理质量不确定的数据,并确保数据通信系统的长期可持续性。本文描述了可操作数字孪生的数据通信基础设施、三维可视化和数据解释工具以及模型开发和实现的设计。结论是流数据的信息量是数字孪生成功开发和运行的关键。本文强调需要进一步研究确保数据质量和预测效果的技术。商业上运营的数字孪生很少被详细描述;讨论为今后协作开发一致的操作和交互框架提供了基础。
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引用次数: 2
Linear regression based indoor daylight illuminance estimation with simple measurements for daylight-linked lighting control 基于线性回归的室内日光照度估算与日光关联照明控制的简单测量
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-09 DOI: 10.1080/19401493.2023.2185684
Hyeong-Gon Jo, S. Choi, C. Park
Accurate prediction of indoor daylight illuminance is crucial for daylight-based lighting controls. However, determining the illuminance using physics-based simulation tools requires significant amounts of information, e.g. grid of sensors, sky model, 3D geometry of a target building and surroundings, etc. In this study, the authors suggest a daylight illuminance estimation method with minimal data of two reference sensors and two prior measurements. It is shown that the daylight coefficient and sky luminance distribution can be substituted by the illuminance of the reference points and illuminance of two or more target points at past times. The method was validated on a large open space with north-facing skylight windows and showed an 11.9% mean absolute percentage error. Additionally, a reference point selection method is presented. The proposed method is practical for daylight-based lighting control applications.
准确预测室内日光照度对于基于日光的照明控制至关重要。然而,使用基于物理的模拟工具来确定照度需要大量的信息,例如传感器网格、天空模型、目标建筑物和周围环境的3D几何形状等。在这项研究中,作者提出了一种基于两个参考传感器和两次先验测量的最小数据的日光照度估计方法。结果表明,白昼系数和天空亮度分布可以用参考点的照度和两个或两个以上目标点在过去时间的照度来代替。该方法在一个朝北的大型开放空间上进行了验证,平均绝对百分比误差为11.9%。此外,还提出了一种参考点选择方法。该方法适用于基于日光的照明控制应用。
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引用次数: 0
Balcony design and surrounding constructions effects on natural ventilation performance and thermal comfort using CFD simulation: a case study 阳台设计及周边结构对自然通风性能和热舒适影响的CFD模拟研究
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-07 DOI: 10.1080/19401493.2023.2185682
Nima Izadyar, W. Miller, B. Rismanchi, V. Garcia-Hansen, Soha Matour
Despite natural light, near-façade structures’ impact on Natural Ventilation (NV) performance, reducing cooling demand, is usually ignored by designers. This article aims to characterize interactions between balconies’ design features (i.e. depth, unit level, and wind incident) and near-façade buildings on single-sided NV performance in a case study, representing medium to high-rise apartments in dominant cooling climates, utilizing validated Computational Fluid Dynamics (CFD) simulations. Results show that nearby buildings, even small structures close to the façade, significantly impact windward flow regime and indoor air movements. Nearby blocks might result in less air entering, which could be moderated by designing deeper balconies. Perpendicular wind incidents to the balcony opening may enormously improve single-sided NV performance. In contrast, wind incidents within higher degrees from perpendicular strongly reduce NV performance. This study provides designers with a method to characterize balcony design features’ effects on NV performance in apartments and improve it concerning urban design.
尽管有自然光,近立面结构对自然通风(NV)性能的影响,减少了冷却需求,通常被设计师忽视。本文旨在利用经过验证的计算流体动力学(CFD)模拟,在一个案例研究中,描述阳台设计特征(即深度、单元水平和风入射)与近立面建筑单面NV性能之间的相互作用,该案例代表了主导凉爽气候下的中高层公寓。结果表明,附近的建筑物,即使是靠近正面的小型建筑物,也会显著影响迎风流动和室内空气运动。附近的街区可能会导致空气进入较少,这可以通过设计更深的阳台来缓和。垂直于阳台开口的风事件可以极大地改善单面NV性能。相反,在垂直度较高的风事件强烈降低NV性能。本研究为设计师提供了一种方法来表征公寓阳台设计特征对NV性能的影响,并在城市设计中加以改进。
{"title":"Balcony design and surrounding constructions effects on natural ventilation performance and thermal comfort using CFD simulation: a case study","authors":"Nima Izadyar, W. Miller, B. Rismanchi, V. Garcia-Hansen, Soha Matour","doi":"10.1080/19401493.2023.2185682","DOIUrl":"https://doi.org/10.1080/19401493.2023.2185682","url":null,"abstract":"Despite natural light, near-façade structures’ impact on Natural Ventilation (NV) performance, reducing cooling demand, is usually ignored by designers. This article aims to characterize interactions between balconies’ design features (i.e. depth, unit level, and wind incident) and near-façade buildings on single-sided NV performance in a case study, representing medium to high-rise apartments in dominant cooling climates, utilizing validated Computational Fluid Dynamics (CFD) simulations. Results show that nearby buildings, even small structures close to the façade, significantly impact windward flow regime and indoor air movements. Nearby blocks might result in less air entering, which could be moderated by designing deeper balconies. Perpendicular wind incidents to the balcony opening may enormously improve single-sided NV performance. In contrast, wind incidents within higher degrees from perpendicular strongly reduce NV performance. This study provides designers with a method to characterize balcony design features’ effects on NV performance in apartments and improve it concerning urban design.","PeriodicalId":49168,"journal":{"name":"Journal of Building Performance Simulation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78579319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2
Experiments and simulations on the energy performance of semi-transparent photovoltaic roof-integrated skylight glazing 半透明光伏屋顶集成天窗玻璃节能性能的实验与模拟
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-06 DOI: 10.1080/19401493.2023.2185683
H. Ding, Guoqing Yu, L. Gu, Daina Luo
Photovoltaic (PV) cells integrated with building roof skylights not only generate electricity but also influence the thermal performance of the roof. In this paper, the thermal mathematical model of a semi-transparent photovoltaic insulating glass unit (STPV-IGU) integrated with the roof is established and validated by experiments. Case studies are conducted by using the roof-integrated STPV-IGU in Shanghai, and an equivalent electrical method is used to evaluate the energy performance of roof-integrated skylight STPV-IGU. The equivalent electricity of heat-gain entering the room through STPV-IGU and total equivalent electricity of roof-integrated STPV-IGU is 16.6 kWh/m2 and 12.1 kWh/m2 in summer, respectively. The equivalent electricity of heat-gain entering the room through STPV-IGU and total equivalent electricity of roof-integrated STPV-IGU are −16.3 kWh/m2 and −4.0 kWh/m2 in winter, respectively. Compared with traditional insulating glass unit, the STPV-IGU can significantly reduce the heat-gains through glazing in summer, but increase indoor heat-loss in winter.
与建筑屋顶天窗集成的光伏(PV)电池不仅可以发电,还可以影响屋顶的热性能。本文建立了与屋顶集成的半透明光伏中空玻璃单元(STPV-IGU)的热学数学模型,并通过实验进行了验证。以上海地区屋顶集成天窗STPV-IGU为例,采用等效电学方法对屋顶集成天窗STPV-IGU的能量性能进行了评价。夏季通过STPV-IGU进入室内的热增益等效电为16.6 kWh/m2,屋顶集成STPV-IGU的总等效电为12.1 kWh/m2。冬季通过STPV-IGU进入室内的热增益等效电为−16.3 kWh/m2,屋顶集成STPV-IGU的总等效电为−4.0 kWh/m2。与传统中空玻璃机组相比,STPV-IGU在夏季可显著降低玻璃热增益,但在冬季增加室内热损失。
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引用次数: 0
Real-time predictive control of HVAC systems for factory building using lightweight data-driven model 基于轻量级数据驱动模型的厂房暖通空调系统实时预测控制
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-03-01 DOI: 10.1080/19401493.2023.2182363
Young Sub Kim, C. Park
This paper presents a real-time implementation of model predictive control (MPC) for HVAC systems in an ice-cream factory building. The target building consists of two large open spaces served by two HVAC systems. We developed four artificial neural network (ANN) models that predict the thermal states of the supply air and indoor air of the two thermal zones and prove to be accurate enough (MBE  = 2.65, CVRMSE = 9.43). The control variables employed in this study are the number of operating chillers, frequency of supply-air fan inverter and outdoor-air intake ratio. The objective function minimizes total energy use, and a constraint was set to maintain average indoor air temperatures close to set points. Real-time MPC was implemented at a sampling time of 20 min from 3 August to 30 August 2021 and could save approximately 31.7% of electricity when compared to the existing simple rule-based control.
本文提出了一种模型预测控制(MPC)在某冰淇淋厂暖通空调系统中的实时实现方法。目标建筑由两个大型开放空间组成,由两个HVAC系统提供服务。我们建立了四个人工神经网络(ANN)模型来预测两个热区送风和室内空气的热状态,并证明了足够的准确性(MBE = 2.65, CVRMSE = 9.43)。本研究采用的控制变量为冷水机组运行数量、送风风机变频频率和室外进风比。目标函数最小化总能源使用,并设置约束以保持室内平均空气温度接近设定点。从2021年8月3日至8月30日,实时MPC在20分钟的采样时间内实现,与现有的简单的基于规则的控制相比,可以节省约31.7%的电力。
{"title":"Real-time predictive control of HVAC systems for factory building using lightweight data-driven model","authors":"Young Sub Kim, C. Park","doi":"10.1080/19401493.2023.2182363","DOIUrl":"https://doi.org/10.1080/19401493.2023.2182363","url":null,"abstract":"This paper presents a real-time implementation of model predictive control (MPC) for HVAC systems in an ice-cream factory building. The target building consists of two large open spaces served by two HVAC systems. We developed four artificial neural network (ANN) models that predict the thermal states of the supply air and indoor air of the two thermal zones and prove to be accurate enough (MBE  = 2.65, CVRMSE = 9.43). The control variables employed in this study are the number of operating chillers, frequency of supply-air fan inverter and outdoor-air intake ratio. The objective function minimizes total energy use, and a constraint was set to maintain average indoor air temperatures close to set points. Real-time MPC was implemented at a sampling time of 20 min from 3 August to 30 August 2021 and could save approximately 31.7% of electricity when compared to the existing simple rule-based control.","PeriodicalId":49168,"journal":{"name":"Journal of Building Performance Simulation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76000105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2
Based on ANN and many-objective optimization to improve the performance and economy of village houses in Chinese cold regions 基于人工神经网络和多目标优化的中国寒区乡村房屋性能和经济性改进
IF 2.5 4区 工程技术 Q1 Engineering Pub Date : 2023-02-28 DOI: 10.1080/19401493.2023.2183259
Juanli Guo, Jian Zhou, Mingchen Li, Siao Lu
The number of studies considering building performance optimization (BPO) in the building design phase is steadily growing, but many of the existing studies do not consider the applicability of many-objective optimization algorithms when increasing the objective dimensions. This article first compares the NSGA-II, IDBEA, MSOPS-II, and NSGA-III algorithms. Then, the algorithm most suitable for many-objective optimization is combined with Artificial natural network(ANN) and TOPSIS-AHP to complete the optimization of four dimensions of building energy consumption (EC), useful daylight illuminance (UDI), comfort time ratio (CTR) and energy-saving envelope cost (ESEC) for village houses in cold regions of China. The results show that the NSGA-III algorithm performs well in terms of convergence speed, convergence, diversity, and uniformity when solving many-objective problems compared to the other three algorithms. Finally, four optimization strategies were selected using the TOPSIS-AHP method.
在建筑设计阶段考虑建筑性能优化(BPO)的研究越来越多,但现有的许多研究在增加目标维度时没有考虑多目标优化算法的适用性。本文首先比较了NSGA-II、IDBEA、msop - ii和NSGA-III算法。然后,将最适合多目标优化的算法与人工自然网络(ANN)和TOPSIS-AHP相结合,完成了中国寒区村舍建筑能耗(EC)、有效日照度(UDI)、舒适时间比(CTR)和节能围护结构成本(ESEC)四个维度的优化。结果表明,与其他三种算法相比,NSGA-III算法在求解多目标问题时具有较好的收敛速度、收敛性、多样性和均匀性。最后,采用TOPSIS-AHP方法选择了4种优化策略。
{"title":"Based on ANN and many-objective optimization to improve the performance and economy of village houses in Chinese cold regions","authors":"Juanli Guo, Jian Zhou, Mingchen Li, Siao Lu","doi":"10.1080/19401493.2023.2183259","DOIUrl":"https://doi.org/10.1080/19401493.2023.2183259","url":null,"abstract":"The number of studies considering building performance optimization (BPO) in the building design phase is steadily growing, but many of the existing studies do not consider the applicability of many-objective optimization algorithms when increasing the objective dimensions. This article first compares the NSGA-II, IDBEA, MSOPS-II, and NSGA-III algorithms. Then, the algorithm most suitable for many-objective optimization is combined with Artificial natural network(ANN) and TOPSIS-AHP to complete the optimization of four dimensions of building energy consumption (EC), useful daylight illuminance (UDI), comfort time ratio (CTR) and energy-saving envelope cost (ESEC) for village houses in cold regions of China. The results show that the NSGA-III algorithm performs well in terms of convergence speed, convergence, diversity, and uniformity when solving many-objective problems compared to the other three algorithms. Finally, four optimization strategies were selected using the TOPSIS-AHP method.","PeriodicalId":49168,"journal":{"name":"Journal of Building Performance Simulation","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87436040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
期刊
Journal of Building Performance Simulation
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