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Yanxue Li
Innovation Institute for Sustainable Maritime Architecture Research and Technology, Qingdao University of Technology, Fushun Road 11, Qingdao 266033, China

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Journal article
Published: 24 June 2021 in International Journal of Environmental Research and Public Health
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ZEHs (Zero Energy House) featuring energy-efficient designs and on-site renewable integration are being widely developed. This study introduced Japanese ZEHs with well-insulated thermal envelopes and investigated their detailed operational performances through on-site measurements and simulation models. Measurement data show that ZEHs effectively damped the variation of indoor air temperature compared to conventional houses, presenting great ability to retain inside heat energy, and are expected to potentially deliver energy flexibility as a virtual thermal energy storage medium. We developed a simplified thermal resistance–capacitance model for a house heating system; response behaviors were simulated under various scenarios. Results compared the variations of indoor temperature profiles and revealed the dependence of load flexibility on the building’s overall heat loss performance. We observed that overall heat loss rate played a crucial role in building heat energy storage efficiency; a well-insulated house shortened the heat-up time with less energy input, and extended the delayed period of indoor temperature under intermittent heating supply; a high set-point operative temperature and a low ambient temperature led to lower virtual thermal energy storage efficiency. The preheating strategy was simulated as an effective load-shifting approach in consuming surplus PV generation; approximately 50% of consumed PV generation could be shifted to replace grid import electricity for room heating during the occupied period.

ACS Style

Xiaoyi Zhang; Weijun Gao; Yanxue Li; Zixuan Wang; Yoshiaki Ushifusa; Yingjun Ruan. Operational Performance and Load Flexibility Analysis of Japanese Zero Energy House. International Journal of Environmental Research and Public Health 2021, 18, 6782 .

AMA Style

Xiaoyi Zhang, Weijun Gao, Yanxue Li, Zixuan Wang, Yoshiaki Ushifusa, Yingjun Ruan. Operational Performance and Load Flexibility Analysis of Japanese Zero Energy House. International Journal of Environmental Research and Public Health. 2021; 18 (13):6782.

Chicago/Turabian Style

Xiaoyi Zhang; Weijun Gao; Yanxue Li; Zixuan Wang; Yoshiaki Ushifusa; Yingjun Ruan. 2021. "Operational Performance and Load Flexibility Analysis of Japanese Zero Energy House." International Journal of Environmental Research and Public Health 18, no. 13: 6782.

Journal article
Published: 15 February 2021 in Sustainability
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In this work, we focus on investigating the relationship between urban morphology parameters and residential building space heating energy performance, comparing microclimate conditions of existing residential blocks with central heating supply. Firstly, a dataset composed of district morphological parameters that measured heat energy consumption was established. Then, effects of morphological indicators including cover ratio, average building height, and floor area ratio on building space heating energy efficiency were assessed specifically. Analysis results show that a larger floor area ratio induced a reduction in heating energy consumption density, the observed effect is notable at an initial increase of floor area ratio. Thirdly, the case study shows that the heating load of residential districts with a high built density is more sensitive to solar radiation. To further assess how and to what extent urban forms alter microclimates, on-site measurement investigated detailed changes in the thermal environment of selected residential districts before and after the operational stage of central heating supply. Analysis results demonstrate that heat energy delivered by a central heating supply could dampen the variations of local outdoor air temperatures, more notable for residential districts with a higher floor area ratio during the night period. Findings from this work would be useful for urban planners considering energy-efficient design practices.

ACS Style

Yanxue Li; Dawei Wang; Shanshan Li; Weijun Gao. Impact Analysis of Urban Morphology on Residential District Heat Energy Demand and Microclimate Based on Field Measurement Data. Sustainability 2021, 13, 2070 .

AMA Style

Yanxue Li, Dawei Wang, Shanshan Li, Weijun Gao. Impact Analysis of Urban Morphology on Residential District Heat Energy Demand and Microclimate Based on Field Measurement Data. Sustainability. 2021; 13 (4):2070.

Chicago/Turabian Style

Yanxue Li; Dawei Wang; Shanshan Li; Weijun Gao. 2021. "Impact Analysis of Urban Morphology on Residential District Heat Energy Demand and Microclimate Based on Field Measurement Data." Sustainability 13, no. 4: 2070.