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Energy flexibility characteristics of centralized hot water system in university dormitories

Building Simulation 2023年第4期16卷 641-662页

作者： Zhiqin Rao Shuqin Chen isaac lun Lizhi Shen Ang Yu Huijun Fu College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310012China Center for Balance Architecture Zhejiang UniversityHangzhou 310012China Department of Architecture and Built Environment University of Nottingham Ningbo ChinaNingbo 315100China Department of General Affairs Zhejiang UniversityHangzhou 310012China

The large-scale application of renewable energy is an important strategy to achieve the goal of carbon neutrality in the building *** flexibility is essential for ensuring balance between energy demand and supply when targeting the maximum penetration rate of renewable energy during the operation of regional integrated energy *** the energy flexibility characteristics of centralized hot water systems,which are an important source of such flexibility,is of great significance to the optimal operation of regional integrated energy ***,in this study,based on the annual real-time monitoring data,the energy flexibility of the centralized hot water system in university dormitories is evaluated from the perspective of available storage capacity(C_(ADR)),recovery time(t_(recovery)),and storage efficiency(η_(ADR)),by the data-driven simulation *** factors influencing the energy flexibility of the centralized hot water system are also *** storage capacity has a strong positive correlation with daily water consumption and a strong negative correlation with daily mean outdoor *** associations indicate that increased water use on the energy flexibility of the centralized hot water system is conducive to optimal *** contrast,higher outdoor temperature is *** hourly mean value of the available storage capacity in spring and winter is found to be around 80 kWh in the daytime,and about twice that in summer and *** time is evenly distributed throughout the year,while t_(recovery)/C_(ADR)in spring and winter is about half that in *** storage efficiency was significantly higher in spring,summer,and winter than in *** hourly mean storage efficiency was found to be about 40%in the *** benefits of activating energy flexibility in spring and winter are the best,because these two seasons have higher available storage capacity and storage efficiency,while the benefit

关键词： energy flexibility centralized hot water system university dormitory back propagation(BP)neural network

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Impact of climate change on outdoor design conditions and implications to peak loads

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Building Simulation 2022年第12期15卷 2051-2065页

作者： Xujie Huo Liu Yang Danny Hin Wa Li isaac lun Siwei Lou Yuan Shi School of Architecture&Urban Planning Shenzhen UniversityShenzhen 518060China BenYuan Design and Research Center Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Architecture for Health&Well-being(in preparation) Shenzhen 518060China School of Architecture Xi’an University of Architecture and TechnologyXi’an 710055China Building Energy Research Group Department of Architecture and Civil EngineeringCity University of Hong KongHong KongChina Centre for Sustainable Energy Technologies University of Nottingham Ningbo ChinaNingbo 315100China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China

This study exams the impact of climate change on outdoor design conditions and peak loads of five Chinese cities over the five major climate zones for the winter and summer *** design dry-bulb temperature(DDBT)and the coincident wet-bulb temperature(CWBT)for two 30-year periods;1971–2000 and 1984–2013 were *** was found that the DDBT of the period 1984–2013 was higher than that of the period 1971–2000,whereas the CWBT and the corresponding outdoor enthalpy of the period 1984–2013 was lower than that of 1971–2000 at the various cumulative *** trend implies that the increment in conductive heat gain through the building envelope due to the rising temperature can be lower than the reduction in fresh air load due to the lower outdoor air *** this case,the peak cooling loads may reduce in all five cities under study,and this is different from the widely held view that global warming will lead to more stringent outdoor design conditions,higher peak cooling loads and larger heating,ventilation and air conditioning(HVAC)plants than the current or historical *** implications to the“free-cooling”of HVAC systems with enthalpy control are discussed as well.

关键词： outdoor design conditions outdoor air enthalpy climate change peak loads

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