Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

 
Session Overview
Session
4ST/7: Science & Technology
Time:
Tuesday, 11/Dec/2018:
9:30am - 10:30am

Session Chair: Prof. Sergio Altomonte
Location: LT7
Lecture Theatre 7, 2/F, Yasumoto International Academic Park, CUHK

Presentations
9:30am - 9:45am

Downscaling Climate Models: Running Nested Simulations In The Microclimate Model ENVI-met

Helge Simon, Tim Kropp, Francesca Sohni, Michael Bruse

Johannes Gutenberg University Mainz, Germany

Due to their high resolutions, microclimate models have high computational demand causing rather long simulation times and limiting the size of model areas. As such limited model areas only cover a small part of the atmosphere, the boundary conditions driving the microclimate simulation play a crucial role in determining the quality of the simulation. In order to incorporate larger scale processes and to ensure the boundary conditions represent the actual conditions at a model’s border, a nesting module was implemented into ENVI-met. Using the new module, coupled simulations can be run where a (smaller) model area is nested into a larger model domain that provides horizontally and vertically dynamic boundary conditions. Since the surrounding larger model domain is typically simulated at a coarser spatial resolution, downscaling methods need to be applied. In the present study the nesting algorithms that manage the extraction of model outputs and the downscaling onto the nested model area’s resolution are presented. Furthermore, a nested model run using a large WUDAPT obtained host model domain is compared against a standard model run using simple forcing boundary conditions. The results showed that nesting provides a reliable way to provide boundary conditions to high resolution, microscale climate simulations.


9:45am - 10:00am

Influence of Office Building’s Height in Urban Areas on Surrounding Microclimate and Building Performance

Jing Li, Michael Donn, Geoff Thomas

Victoria University of Wellington, New Zealand

This paper presents a methodology intended to integrate building performance modelling and urban microclimate studies and explore their interaction at different heights. In this study, Urban Weather Generator (UWG) is used to evaluate urban microclimates across a 3-dimensional landscape. UWG can calculate the effect of Urban Heat Islands (UHI) on temperature across a 2-dimensional landscape but does not consider wind effects. A new methodology is presented in this paper to model urban microclimates more accurately. Using London as a case study, high-rise office building performance at different heights is examined. The variation of urban microclimate with height and relative to the rural weather data is reported through evaluation of its impact on building performance.


10:00am - 10:10am

Distributed rule of Solar Radiation for Building Heating in Western China

Liu Dalong, Yang Jingli, Liu Jiaping, Wang Wenqin, Ma Lan

Xi’an University of Architecture and Technology, China, People's Republic of

In order to reveal the distributed rule of solar radiation for building heating in the Western China, south oriented surface solar radiation, optimal inclination angle solar radiation of solar PV panels and heating degree days were used as districted indicators to study the solar radiation zoning in western China. Method of mode calculation was used to obtain the missing data of south oriented surface solar radiation. 4 cities are selected as verification points to obtain the critical direct solar radiation needed for calculation. Through the comparison of the 3 models, the direct solar radiation calculation model suitable for the western region is found. According to the ten-year average of the above three indicators, the clustering analysis method was used to get the solar radiation zones for building thermal utilization in the Western China. The rule of solar radiation intensity of each zone was summarized from the perspective of building heating.


10:10am - 10:20am

Steady-state or transient heat balances for comparable energy demand calculations? A case-study based on a sandwich lightweight structure

Roland Martin Goettig

Technical University Munich, Germany

Energy demand calculations are very common nowadays due to various regulations and assessment methods around the world. Depending on local regulations they are usually carried out with either simplified steady-state energy balances or with dynamic simulations. Hereby, most stead-state calculations are based on the same temperature difference between inside and outside over a whole heating period or on monthly mean values compared to hourly data for transient calculations. In a case study on a sandwich-lightweight structure it became evident that dynamic calculations with transient weather data show results where the energy demand is approximately up to 50 % lower than steady-state calculations according to a German standard. Therefore, steady-state calculations cannot be recommended without restriction e.g. for sustainability assessment.