Research Publications

ABSTRACT | PID controllers are still prevailing in building environmental control due to its easy deployment and acceptable performance. However, it is common in practice that the PID controllers are not tuned properly because of the limited time for commissioning and the inexperienced practitioners. This study proposes a simulation-based method to provide instructions for on-site tuning. Due to th...

ABSTRACT | Due to the diversity and randomness of heating and cooling usage behavior in buildings, occupant behavior can lead to great variation in building energy consumption. In the study of occupant behavior modeling, the characteristic parameters obtained from limited case studies are difficult to fully reflect the diversity and distribution characters of occupant behavior of large population. ...

ABSTRACT | This study proposes a hybrid space filling design method combining the high-dimensional clustering method with the existing statistical sampling method to design the variables and cases for a BPD of office buildings. With this method, we can build a BPD only including about 10,000 cases but having the capability of representing the high-dimensional space constructed by 16 building energy...

ABSTRACT | Heat rejection from air conditioners not only contribute the outside environment surrounding the buildings but also increase the cooling loads. Based on it, A novel methodology to fully-scale amend the weather data in summer season is proposed, as a means of quantizing the results. Two software, EnergyPlus and Fluent were employed in this study. Three variables were inputted into Fluent ...

ABSTRACT | 由于建筑能耗模型与实际数据间存在信息差，其模拟结果和实测值之间常出现误差，且此误差有时甚至超过 100%。误差的存在大大降低了模型的可信度，也削弱了其在建筑运行评价中发挥的作用。因此在建模的过程中，需要对模型进行校验，以降低模拟值和实际值之间的误差，增加可靠性。本文提出一种基于符号有向图的建筑能耗模型校验方法，将人工校验的知识和逻辑模块化，为人工智能大趋势下结合人工和自动校验双边优势的途径发...

ABSTRACT | 随着人民生活水平的日益提高，我国酒店业市场呈现显著增长趋势。从国家能源安全和节能减排工作的角度出发，酒店类建筑面积的日益增长所带来的能源消耗和碳排放问题日益凸显；从酒店提高自身效益的角度出发，设备节能则是扩大利润的有效途径。本文根据酒店客房实测数据，确定了酒店客房人员在室率时间表；根据调研数据，建立了不同气候区不同客房尺寸的典型客房模型，并开发软件根据用户选择的节能措施对模型进行修改，模...

ABSTRACT | 空调系统运行优化是建筑节能的重要组成部分。本文将强化学习算法应用在空调系统运行优化中。首先建立空调系统运行优化任务的马尔科夫决策过程模型，接下来确立规则对探索空间进行进一步缩减，使探索过程尽可能满足系统设备运行和被控区域舒适度的约束，最后应用 Q-Learning 算法探索学习不断改进控制策略。通过仿真案例对算法进行了测试。采用动态仿真软件 TRNSYS 和 MATLAB 进行联合仿真，对被控区域送风量进行了优化，...

ABSTRACT | 目前，对于公共建筑的集中式空调系统来说，其规模一般是比较大的。这也就意味着，储存在其水系统的冷冻水之中的冷量是相当可观的，具有利用的价值。在系统优化运行控制的层面来看，对该部分冷量的利用，相当于对空调水系统的运行进行优化的过程中，考察其自身的蓄能特性。在考虑到蓄能作用基础上的空调水系统优化算法，可以实现对应于峰谷电价的错峰填谷、提前关闭系统以利用剩余冷量等更广泛的优化排期功能。本研究以...

ABSTRACT | This paper aims to study the impact of community form on building energy consumption of commercial district. Building typology and FAR (floor area ratio) are two important morphology factors in district energy efficiency design. To explore how they influence building energy consumption, two major questions are concerning: (1) how a given FAR generates alternative building typologies that...

ABSTRACT | In architectural design, solar energy building has become the focus of many architects. In order to achieve the expected energy efficiency, the appropriate energy system should be configured during the design phase in accordance with the idea of building integrated design. In this paper, a house was designed for Solar Decathlon competition 2017 in China. In order to reach the target of e...

ABSTRACT | As an important part of green eco-community planning, reasonable community energy planning requires accurate community load prediction. Hence, this paper focuses on the method of community load prediction. Given that community energy planning has great uncertainty and forward-looking requirements, this paper proposes an integrated method of buildings load prediction, which combines build...

ABSTRACT | Data-driven Models (DMs) play a significant role in the building energy prediction researches. The lack of targeted summary on DMs usually makes researchers and scientists engaged in promoting building energy performance confused of the selection and application of DMs. This paper primarily summarizes the application of DMs in the field of building energy prediction. According to the met...

ABSTRACT | Most of the local pressure loss coefficient (LPLC) models for duct fittings used in heating ventilation and air conditioning (HVAC) air-side system transient simulations are the simplified ones. The LPLCs are defined as a constant value at the rated flow condition or as a polynomial function of flow ratio (or velocity ratio). However, literature reviews give the evidence that the LPLC is...

ABSTRACT | The operation effect of industrial process is largely determined by the automatic control system. In the conventional control process, the Proportional Integral and Derivative (PID) parameters need to be set according to the engineering experience. Not only is the control precision not enough, but also the robustness is poor. The performance of PID control based on the system transfer fu...

ABSTRACT | This study is to assess the impact of residential morphology and microclimate on energy use at the neighbourhood scale. At the scale of 200m×150m, based on the common residential forms in Shanghai, seven real residential districts are selected as research objects, including the garden houses, 6-storey flats, 14-storey flats, 28-storey flats, lane houses, slab-type apartments and high-ris...

ABSTRACT | In this study, we develop a quadratic homogeneous polynomial (QHP) regression model for predicting chillers and present its online tuning strategy. First, sample data is processed using the ordinary least square (OLS) method to obtain the initial QHP model. Second, errors occurred during on-site monitoring are categorized based on which data-processing rules are deduced to filter outlier...

ABSTRACT | A good wind and thermal environment of residential districts can speed up the outdoor heat and pollutant dissipation, as well as ensure the comfort and health of residents. The thermal environment in residential districts is affected mainly by layout form, building shape, underlying surface characteristics, etc. In this paper, a residential area located in Qingdao is studied. Numerical s...

ABSTRACT | In this paper, a study to evaluate the feasibility of implementing naturalventilation using operable windows in an airtight high-rise office building, which is located in Shanghai (China), is presented. In this building, the natural ventilation would work collaboratively with the mechanical cooling/ventilation system. In order to help the building operator to decide whether the natural ...

ABSTRACT | To study the performance of nozzle air supply in a large space building, this paper builds a simplified computational model of a large exhibition hall applied with vertical nozzle air supply system using the method of computational fluid dynamics (CFD). The Fluent software is used to realize the three-dimensional simulation and obtain the temperature field and velocity field in the occup...

ABSTRACT | Building shape coefficient is an important index in building energy efficiency design, it is considered that the smaller the indicator, the less heat loss via the building envelope and the less energy consumption. However, building energy consumption consists not only air-conditioning consumption, but also lighting consumption. This study is based on the concept of passive volume and ass...