Da Yan

Da Yan
Tsinghua University | TH ·  School of Architecture

PhD

About

223
Publications
111,247
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
6,541
Citations
Introduction
Tenured Professor, School of Architecture, Tsinghua University. Prof. Yan is mainly devoted into three fields: (1) Development of building performance simulation toolkit DeST; (2) Research on quantitative description of occupant behavior; (3) Research on building energy consumption model of China and low-carbon and energy-saving related policy.

Publications

Publications (223)
Article
The excessive simplification of occupant behavior is considered as the most important factor that affects the uncertainty of building performance simulation, thus affects the reliability and generalizability of simulation-based design and forecast. In this paper, occupant behavior in air-conditioned office buildings of the Pearl River Delta (PRD) r...
Article
Full-text available
Buildings are a major contributor to climate change, accounting for one third of global energy consumption and one quarter of CO2 emissions. However, comprehensive information is lacking for the development, evaluation and monitoring of mitigation policies. This paper discusses the remaining challenges in terms of reliability and consistency of the...
Article
Full-text available
Model predictive control (MPC) has shown potential in improving building performance but is bottlenecked by the difficulty in constructing control-oriented models. The challenge lies in evaluating the sufficiency of the model and the data usage beforehand. This paper bridges the knowledge gaps in the interactions between data requirements, model qu...
Article
Exposure to excessive ambient light at night (ALAN) has been proved to have a statistical association with human diseases. But current studies on ALAN exposure inequity have likely underestimated exposure levels due to the neglect of personal mobility. Based on mobile phone positioning big data and night-light satellite imagery, we conducted an emp...
Article
Full-text available
With the increase in the energy consumption of air-conditioning (AC) systems in Chinese residential buildings, the realization of energy savings in AC systems has attracted increasing attention. The variable refrigerant flow (VRF) system is a common AC system for residential buildings in China. In most previous studies on VRF systems, onsite measur...
Article
Thermal energy storage (TES) is an effective method for load shifting and demand response in buildings. Optimal TES control and management are essential to improve the performance of the cooling system. Most existing TES systems operate on a fixed schedule, which cannot take full advantage of its load shifting capability, and requires extensive inv...
Article
Full-text available
Urban building energy modeling (UBEM) is a promising tool to evaluate building energy consumption at high temporal-spatial resolution at urban scale. However, state-of-the-art UBEMs use identical building envelope thermal transmittance according to design specifications in model characterization, which neglects the uncertainty in U-values of the bu...
Article
Full-text available
Machine learning is considered a promising method for developing building energy-benchmarking models. However, the high dimensionality of building energy datasets can reduce model accuracy and generalization but increase the computational cost. Meanwhile, the poor interpretability of machine learning models limits the understanding of insights and,...
Article
Full-text available
This paper introduces a database of 34 field-measured building occupant behavior datasets collected from 15 countries and 39 institutions across 10 climatic zones covering various building types in both commercial and residential sectors. This is a comprehensive global database about building occupant behavior. The database includes occupancy patte...
Article
The building sector is one of the largest energy user and carbon emitter globally. To achieve China’s national carbon target, the building sector in China needs to achieve carbon peaking and neutrality targets by 2030 and 2060, respectively. However, data deficiency on building energy and emissions become barriers for tracking the status of buildin...
Article
Full-text available
Renewable energy is important for achieving carbon neutralization. However, power generation from renewable energy sources can be uncertain and uncontrollable. Therefore, understanding the features of energy demand is pivotal for integrating renewable energy sources and storage systems within the entire energy network. Traditional load profiles are...
Article
Full-text available
Buildings contribute to almost 30% of total energy consumption worldwide. Developing building energy modeling programs is of great significance for lifecycle building performance assessment and optimization. Advances in novel building technologies, the requirements of high-performance computation, and the demands for multi-objective models have bro...
Article
The availability of computational power, and a wealth of data from sensors have boosted the development of model-based predictive control for smart and effective control of advanced buildings in the last decade. More recently occupant-behavior models have been developed for including people in the building control loops. However, while important ob...
Article
Full-text available
Embodied carbon emissions of the building sector constitute the majority of carbon emissions. The selection of a building stock development pathway, construction mode, and synergy between the building construction and industry sectors will greatly influence the future embodied carbon emissions in China's building sector. The main purpose of this st...
Article
Full-text available
Besides highly reflecting solar energy, the spectrum-selective radiative cooling materials (RCMs) dissipate heat to outer space especially through the atmospheric window (e.g., 8–13 μm) and achieve sub-ambient temperature under direct sunlight. Not only potentially contributing to Earth’s heat rebalance, the daytime radiative cooling technology but...
Article
Low-income households face long-standing challenges of energy insecurity and inequality (EII). During extreme events (e.g., disasters and pandemics) these challenges are especially severe for vulnerable populations reliant on energy for health, education, and well-being. However, many EII studies rarely incorporate the micro- and macro-perspectives...
Article
Full-text available
Solar hot water (SHW) systems are widely used to save energy and reduce CO2 emissions. The domestic hot water (DHW) usage behavior of occupants has a significant influence on the energy consumption of SHW systems; the operation of SHW systems also affects the DHW usage of occupants. However, there is a lack of quantitative analysis for coordinating...
Article
As the number of high-rise buildings increases, so does the demand for meteorological data at different heights. The difference in meteorological elements in the vertical direction should be considered in heating, ventilation, and air conditioning design and building performance simulations (BPS). This study uses a meteorological tower in Beijing a...
Article
Ground-coupled building envelopes contribute to up to 45% of total building heat loss. Dynamic simulation of the thermal process of the building-ground structure is essential for whole-year building energy simulations and evaluations. There exist various types of underground heat transfer models, while the adoption of dynamic underground heat trans...
Article
Understanding window operating behavior in offices is important in terms of its influence on reducing energy consumption and improving indoor comfort. Researchers have applied different mathematical methods to develop useful window operating behavior models, however, the applicable machine learning algorithms are still in their preliminary research...
Chapter
The Predicted Mean Vote (PMV) model is extensively used by current thermal comfort standards, such as ASHRAE 55 and ISO 7730, despite its discrepancy in predicting Thermal Sensation (TS). The implicit assumption is that PMV can be applied for predicting TS of a large population. Our statistical analysis of a subset of ASHRAE global database of ther...
Chapter
The energy shortage is one key issue for sustainable development, a potential solution of which is the integration with the renewable energy resources. However, the temporal sequential characteristic of renewable resources is different from traditional power grid. For the entire power grid, it is essential to match the energy generation side with t...
Chapter
Full-text available
The lighting system accounts for 8% of the total electricity consumption in commercial buildings in the United States and 12% of the total electricity consumption in public buildings globally. This consumption share can be effectively reduced using the demand-response control. The traditional lighting system control method commonly depends on the r...
Chapter
In building performance simulation, occupant behaviour contributes to large uncertainties, which often lead to considerable discrepancies between actual energy consumption and simulation results. This chapter aims to extract occupant-behaviour related electricity load patterns using classical K-means clustering approach at the initial investigation...
Article
This paper reviews the state-of-the-art smart building research by a bibliometric analysis, a content analysis, and a qualitative review. The bibliometric analysis of 364 academic papers shows that smart building is a burgeoning, interdisciplinary field with a relatively high international collaboration level. Keyword's clustering identified two ma...
Article
Air conditioning (AC) operating behavior has a significant influence on the energy consumption of buildings. Machine learning (ML) methods have recently been developed and have shown a high performance in predicting occupant behaviors. However, owing to a lack of comparison of different ML algorithms based on the same database and evaluation indica...
Article
Full-text available
Building occupancy is the basis for building energy simulations, operations, and management. With the increasing need for energy conservation and the occupant-centric service of building energy systems, occupancy forecasting has become an essential input for simulations. These applications include model predictive control and demand response, with...
Article
Full-text available
Indoor environment construction for occupants has high energy consumption; as such, occupancy plays a noteworthy role in the complete life cycle phase of buildings, including design, operation, and retrofitting. In the past few years, building occupancy, which is considered the basis of occupant behavior, has attracted increasing attention from res...
Article
Traditional occupant behavior modeling has been studied at the building level, and it has become an important factor in the investigation of building energy consumption. However, studies modeling occupant behaviors at the urban scale are still limited. Recent work has revealed that urban big data can enable occupant behavior modeling at the urban s...
Article
Full-text available
Occupancy schedule is one of the essential inputs for building performance simulation. Current designers and researchers refer to the occupancy schedules from energy standards such as ASHRAE 90.1, which was initially published in 1989 and may not apply to the occupancy profiles of the current circumstances. With the advances of mobile communication...
Article
Full-text available
Urban Photovoltaic (PV) systems can provide large fractions of the residential electric demand at socket parity (i.e., a cost below the household consumer price). This is obtained without necessarily installing electric storage or exploiting tax funded incentives. The benefits of aggregating the electric demand and renewable output of multiple hous...
Chapter
Energy poverty is very much interlinked with housing stock characteristics in terms of energy performance. Energy-led building renovation within the social housing stock combines the energy-saving goal with social and economic co-benefits (e.g., poverty alleviation and health improvements), thus contributing to facing stigmatization, social segrega...
Article
Full-text available
Affected by climatic changes, heat waves have become a global concern and have a huge impact on the indoor environment and the life and health of low-income households. Although there are several studies focusing on energy poverty, only a few have focused on the cooling poverty in China. Focusing on the low-income households in Beijing, an online q...
Article
Full-text available
Occupancy is a significant area of interest within the field of building performance simulation. Through Bayesian calibration, the present study investigates the impact of the availability of different spatial resolution of occupancy data on the gap between predicted and measured energy use in buildings. The study also examines the effect of occupa...
Article
Building energy use is becoming increasingly important in China. Despite a rapid growth in recent years, energy use intensity in China is still relatively low compared to other advanced economies; thus, there is still substantial room for it to increase as living standards and industrial services are improved. It is therefore important to focus on...
Conference Paper
The understanding of occupant behavior (OB) is vital to improve building energy performance, and this understanding needs an interdisciplinary approach that incorporates a holistic view of the topic. However, social dimensions of this behavior tend to be neglected. Based on the Theory of Planned Behavior, this study assesses the perceptions of occu...
Article
An increasing number of tall buildings have been constructed over the last 20 y with growing economic development and populations. In 2017, there were 144 new buildings worldwide that were 200 m or greater in height; 50% of these buildings were in China. Due to the vertical gradient impact of meteorological parameters, the energy performance of tal...
Article
In the US, people spend more than 90% of their time in buildings, which contributes to more than 70% of overall electricity usage in the country. Occupant behavior is becoming a leading factor impacting energy consumption in buildings. Existing occupant-behavior studies are often limited to a single building and individual behavior, such as presenc...
Article
Full-text available
Buildings have a significant impact on global sustainability. During the past decades, a wide variety of studies have been conducted throughout the building lifecycle for improving the building performance. Data-driven approach has been widely adopted owing to less detailed building information required and high computational efficiency for online...
Article
The energy consumption of air-conditioning systems has gained increasing attention as it contributes significantly to the global building energy use. The variable refrigerant flow (VRF) system is a common air-conditioning system applied widely in residential and office buildings in China. Understanding the actual operation and performance of VRF sy...
Article
Full-text available
Electricity is now the major form of energy used in residential buildings and has seen a significant increase in usage over the past decades. One of the main features of electricity use in residential buildings is the diversity of total electricity consumption and use patterns among households. Current models may not be able to simulate and generat...
Article
Full-text available
The deployment of solar photovoltaics (PV) and electric vehicles (EVs) is continuously increasing during urban energy transition. With the increasing deployment of energy storage, the development of the energy sharing concept and the associated advanced controls, the conventional solar mobility model (i.e., solar-to-vehicles (S2V), using solar ener...
Preprint
Occupancy is a significant area of interest within the field of building performance simulation (BPS). Through Bayesian calibration, the present study investigates the impact of the availability of different spatial resolution of occupancy data on the gap between predicted and measured energy use in buildings. The study also examines the effect of...
Article
Building plays an important role in addressing climate change, with many studies on these topics having been conducted from a global perspective. However, building energy use is found to differ greatly among different countries, with the gaps yet to be fully considered or discussed. Thus, a picture of the overall situation in each country may be ne...
Article
Full-text available
Research on the window operating behavior of offices is of great significance for reducing building energy consumption and improving indoor comfort. The open-plan office is a common office form that involves a large number of people and a complex staff composition. The window operating behaviors in open-plan offices are also random and various. Thi...
Article
Solar radiation considerably influences the energy consumption of buildings and the power production of building integrated photovoltaic (BIPV) systems. Hourly solar insolation (Wh/m²), represented as the amount of solar irradiance collected on the ground during a 1-h period, is the most common solar radiation data available and widely used in weat...
Article
Full-text available
Estimates of the non-CO2 greenhouse gas (GHG) emissions contributed by the buildings sector are necessary to evaluate this sector’s potential for climate change mitigation. As data is lacking on fluorinated gases (F-gases) and hydrofluorocarbon (HFC) emissions from the buildings sector, this study aimed to estimate these emissions. First, the share...
Article
Heating, ventilation and air-conditioning (HVAC) systems have been adopted to create comfortable, healthy and safe indoor environments. In the control loop, the technical feature of the human demand-oriented supply can help operate HVAC effectively. Among many technical options, real time monitoring based on feedback signals from end users has been...
Article
Reliable energy and performance prediction for building design and planning is important for newly-designed or retrofitted buildings. Window operating behavior has an important influence on the ventilation and energy consumption of these buildings under different realistic scenarios. Therefore, quantitatively describing this behavior and constructi...
Article
Full-text available
Aside from the consumption for domestic cooling and heating, the energy consumption of appliances in a household is a large amount. This energy use by appliances is highly dependent on the activities of the occupants in a building. Occupant behavior in residential buildings possesses the characteristic of randomness, variety, and complexity. More s...
Article
Full-text available
Space cooling energy consumption is a significant component of building energy consumption, and in recent years it has attracted much attention worldwide owing to its significantly increasing usage. The variable refrigerant flow (VRF) system is one common type of cooling equipment for buildings in China and is applied extensively to residential and...
Article
The proliferation of urban sensing, IoT, and big data in cities provides unprecedented opportunities for a deeper understanding of occupant behaviour and energy usage patterns at the urban scale. This enables data-driven building and energy models to capture the urban dynamics, specifically the intrinsic occupant and energy use behavioural profiles...
Article
An occupant's window opening and closing behaviour can significantly influence the level of comfort in the indoor environment. Such behaviour is, however, complex to predict and control conventionally. This paper, therefore, proposes a novel reinforcement learning (RL) method for the advanced control of window opening and closing. The RL control ai...
Article
Full-text available
The lighting system accounts for 8% of the total electricity consumption in commercial buildings in the United States and 12% of the total electricity consumption in public buildings globally. This consumption share can be effectively reduced using the demand-response control. The traditional lighting system control method commonly depends on the r...
Article
Despite the fact that buildings are designed for occupants in principle, evidence suggests buildings are often uncomfortable compared to the requirements of standards; difficult to control by occupants; and, operated inefficiently with regards to occupants’ preferences and presence. Meanwhile, practitioners –architects, engineers, technology compan...
Article
Buildings consume about 20% of the total primary energy use in China. It is critical to enhancing building energy efficiency for sustainable development. The heating, ventilation, and air-conditioning (HVAC) systems account for about half of the energy consumption in commercial buildings. For large commercial buildings, central chiller plants are t...