Modeling urban building energy use: A review of modeling approaches and procedures

Li, Wenliang,Zhou, Yuyu,Cetin, Kristen,Eom, Jiyong,Wang, Yu,Chen, Gang,Zhang, Xuesong Elsevier 2017 ENERGY Vol.141 No.-

<P><B>Abstract</B></P> <P>With rapid urbanization and economic development, the world has been experiencing an unprecedented increase in energy consumption and greenhouse gas (GHG) emissions. While reducing energy consumption and GHG emissions is a common interest shared by major developed and developing countries, actions to enable these global reductions are generally implemented at the city scale. This is because baseline information from individual cities plays an important role in identifying economical options for improving building energy efficiency and reducing GHG emissions. Numerous approaches have been proposed for modeling urban building energy use in the past decades. This paper aims to provide an up-to-date review of the broad categories of energy models for urban buildings and describes the basic workflow of physics-based, bottom-up models and their applications in simulating urban-scale building energy use. Because there are significant differences across models with varied potential for application, strengths and weaknesses of the reviewed models are also presented. This is followed by a discussion of challenging issues associated with model preparation and calibration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Advances in urban buildings energy models are reviewed. </LI> <LI> Strengths and weaknesses of urban building energy models are discussed. </LI> <LI> The workflow of physics-based bottom-up models are illuminated. </LI> <LI> Challenges and future research avenues in urban buildings energy use modeling are highlighted. </LI> </UL> </P>

Components Replenishment Model of ATO Supply Chain with Supplier Alliance

Li Yuyu,Huang Bo 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.7

Under the assumption that ATO (assemble-to-order) supply chain consists of an assembler and two suppliers, who respectively provide one component to the assembler and may form an alliance to negotiate with the assembler, we develop a components replenishment model to study how the ATO supply chain decides components replenishment policies and the suppliers’ alliance policies. The optimal solution of the model is obtained, and the effects of the bargaining power on the optimal solution are theoretically and numerically analyzed. We found that with the enhancement of the bargaining power of the assembler to one supplier, the component selling price and profits of this supplier reduce, and those of another supplier increase. Simultaneously, the expected profit of the assembler increases if its bargaining power is stronger than the other supplier, otherwise, it decreases. If both suppliers’ bargaining powers are stronger than assembler’s, they should bargain with the assembler jointly; if both of their bargaining powers are weaker than the assembler’s, they will bargain with the assembler individually.

Hierarchical Age Estimation based on Dynamic Grouping and OHRank

( Li Zhang ),( Xianmei Wang ),( Yuyu Liang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.7

This paper describes a hierarchical method for image-based age estimation that combines age group classification and age value estimation. The proposed method uses a coarse-to-fine strategy with different appearance features to describe facial shape and texture. Considering the damage to continuity between neighboring groups caused by fixed divisions during age group classification, a dynamic grouping technique is employed to allow non-fixed groups. Based on the given group, an ordinal hyperplane ranking (OHRank) model is employed to transform age estimation into a series of binary enquiry problems that can take advantage of the intrinsic correlation and ordinal information of age. A set of experiments on FG-NET are presented and the results demonstrate the validity of our solution.

Kinetics of 5-Hydroxymethylfurfural Formation in Chinese Acacia Honey during Heat Treatment

Yuyu Zhang,Yi Song,Tingting Zhou,Xiaojun Liao,Xiaosong Hu,Quanhong Li 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.6

In this paper, the 5-hydroxymethylfurfural (HMF) contents of the acacia honeys after heat treatment were determined by HPLC; the kinetics of HMF formation was also investigated. The HMF content of acacia honey was 0.38±0.01mg/kg, but rapidly increased to the maximum of 18,320.07±14.29 mg/kg at 190oC and decreased to 1,180.24±6.54 mg/kg at 230oC after heating. The HMF content increased gradually in honey samples heated in 12h at the temperature of 80, 100, and 120oC. The apparent frequency constant was kf =3.91×1025/h, and the apparent activation energy was Ea=173.10 kJ/mol. The HMF content in the acacia honey was related to honey composition,heating temperature, and time, and the HMF formation could also be related to the initial honey pH.

Predicting Web Service QoS via Combining Matrix Factorization with Network Location

Li Zhou,Zhibo Song,Suichu Zhai,Tan Xiao,Yuyu Yin 보안공학연구지원센터(IJUNESST) 2014 International Journal of u- and e- Service, Scienc Vol.7 No.3

Preparation and Aroma Analysis of Chinese Traditional Fermented Flour Paste

Yuyu Zhang,Mingquan Huang,Hongyu Tian,Baoguo Sun,Jing Wang,Quanhong Li 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.1

Volatile compounds in Chinese fermented flourpaste were extracted using simultaneous distillation andextraction (SDE) and analyzed using gas chromatographymassspectrometry (GC-MS) with DB-5 and DB-WAXcapillary columns. A total of 84 volatile compounds wereidentified, including 8 aldehydes, 19 esters, 14 acids, 17hydrocarbons, 7 heterocycles, and 19 other trace compounds. The major volatiles included furfural, 5-methyl-2-phenyl-2-hexenal, 4-ethylguaiacol, 2-phenylacetaldehyde, ethylhexadecanoate, isovaleraldehyde, palmitic acid, and 5-methylfurfural. Aroma compounds were investigated usinggas chromatography-olfactometry (GC-O) and aroma extractdilution analysis (AEDA). A total of 27 olfactory regionswere exposed and 18 aroma extracts were located. Altogether,6 aroma compounds identified using GC-O showed higherflavor dilution factors (FD≥32), including isovaleraldehyde,furfural, pentanoic acid, 2-acetylfuran, 1-octen-3-ol, and 2-phenylacetaldehyde. Compared with soybean sauce, fermentedflour paste has more esters and aldehydes, which contributeto the desired fruity, caramel, sweet, and roasted odors.

A BIM Based Approach for Structural Health Monitoring of Bridges

Xiaofei Li,Yuyu Xiao,Hainan Guo,Jisong Zhang 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1

With the development of bridges, independent condition assessment of large-scale bridges has garnered significant attention over the past few decades. Data-driven structural health monitoring (SHM) techniques offer valuable information on the existing health of the structures, maintain safety, and uninterrupted use under varied operational conditions by undertaking timely risk and hazard mitigation. Traditional approaches, however, are not enough to monitor a large amount of SHM data and conduct systematic decision making for future maintenance. In this paper, a bridge health monitoring system is developed through the combination of building information modeling (BIM) and traditional bridge health monitoring that can organize and visualize a considerable amount of sensor data and subsequent structural health information over a prolonged period. The system can identify the structural damage by evaluating the data from sensors using Wigner-Ville distribution (WVD) in bilinear time-frequency analysis. A BIM-enabled platform is utilized to develop the proposed visualization tool for a long-span bridge and enable automated sensor data inventory into the BIM environment. The system has been tested for its robustness and functionality against the development requirements, and the results showed promising potential to support more effective bridge information management.

Deep dechlorination of hydrocarbon oil by reactive adsorption on TiO2-based metal oxides

Hui Niu,Yuyu Feng,Jie Ding,Wei Zhang,Chenxing Hu,Qingxiang Zhang,Chen Zhang,Cuiqing Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO2-based metal oxides atthe temperatures of 20-150 oC. TiO2 and a series of TiO2-CeO2 were prepared by precipitation method and characterizedby N2 adsorption, XRD, FT-IR, pyridine-IR, NH3-TPD and CO2-TPD. The characterization results showed thatboth the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO2-U precipitatedby urea exhibited higher dechlorination capacity than TiO2-A precipitated by ammonia due to the higher surfacearea, more acid and base amounts of the former. Among various Ti(1x)CexO2 (x=0.1, 0.3, 0.5, 0.7, 0.9, 1) oxides,Ti0.7Ce0.3O2 and Ti0.3Ce0.7O2 bimetallic oxides showed higher dechlorination capacity than TiO2-U, and the chlorineremoval over Ti0.7Ce0.3O2 reached 82.8% after adsorption at 150 oC for 3 h. Mixing 5 wt% of alkali earth metal oxideinto Ti0.7Ce0.3O2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti0.7Ce0.3O2-BaOreached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatographyand GC-MS analysis revealed that organochlorine compound was converted into Cl and its corresponding alcoholover the adsorbent at 150 oC. Finally, the mechanism of reactive adsorption dechlorination was proposed.

Random dynamic analysis for simplified vehicle model based on explicit time-domain method

Huan Huang,Yuyu Li,Wenxiong Li,Guihe Tang Techno-Press 2023 Coupled systems mechanics Vol.12 No.1

On the basis of the explicit time-domain method, an investigation is performed on the influence of the rotational stiffness and rotational damping of the vehicle body and front-rear bogies on the dynamic responses of the vehicle-bridge coupled systems. The equation of motion for the vehicle subsystem is derived employing rigid dynamical theories without considering the rotational stiffness and rotational damping of the vehicle body, as well as the front-rear bogies. The explicit expressions for the dynamic responses of the vehicle and bridge subsystems to contact forces are generated utilizing the explicit time-domain method. Due to the compact wheel-rail model, which reflects the compatibility requirement of the two subsystems, the explicit expression of the evolutionary statistical moment for the contact forces may be performed with relative ease. Then, the evolutionary statistical moments for the respective responses of the two subsystems can be determined. The numerical results indicate that the simplification of vehicle model has little effect on the responses of the bridge subsystem and the vehicle body, except for the responses of the rotational degrees of freedom for the vehicle subsystem, regardless of whether deterministic or random analyses are performed.

Optimizing Web Service Composition for Data-intensive Applications

Dongjin Yu,Chang Li,Yuyu Yin 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.2