Modelling Of A Naturally Ventilated Bipv System For Building Energy Simulations,
2018
KU Leuven
Modelling Of A Naturally Ventilated Bipv System For Building Energy Simulations, Juliana Gonçalves, Glenn Reynders, Jonathan Lehmann, Dirk Saelens
International Building Physics Conference 2018
Two major causes of energy yield reduction in PV systems are partial shading and high operating temperatures. Both issues are particularly critical for BIPV systems. The correct assessment of the BIPV contribution to the built environment depends, therefore, on the accurate prediction of PV temperature and on the possibility of simulating shading effects. This paper describes the development of a multi-physics model for a naturally ventilated façade BIPV system within the openIDEAS environment for building and district energy simulations. The PV electrical model used here follows a physics-based approach that takes into account solar intensity and temperature spatial variations within …
Numerical Analysis Of The Influencing Factors On The Performance Of A Pipe-Embedded Window Operated In Summer,
2018
Tsinghua University
Numerical Analysis Of The Influencing Factors On The Performance Of A Pipe-Embedded Window Operated In Summer, Sihang Jiang, Chong Shen, Xianting Li
International Building Physics Conference 2018
The pipe-embedded window is a double window structure with pipes embedded inside the cavity to adjust the temperature. The preliminary studies showed that it can significantly reduce the cooling load of buildings with natural cooling sources such as the water from cooling towers in summer. However, the research on the influencing factors of the pipeembedded window is insufficient. In this paper, the numerical calculation models are established for a pipe-embedded window and a traditional window. The influence of climatic factors, such as the natural cooling source temperature and outdoor air temperature on the thermal performance of the pipe-embedded window are …
Hygrothermal Analysis Of A Vapour-Open Assembly With Vacuum Insulation Panels,
2018
Carleton University
Hygrothermal Analysis Of A Vapour-Open Assembly With Vacuum Insulation Panels, Brock Conley, Cynthia Ann Cruickshank, Mark Carver
International Building Physics Conference 2018
The following paper studies the year-long moisture conditions associated with vacuum insulation as the exterior insulation. The exterior insulation of one assembly was renovated by using 50.8 mm (2 inch) of expanded polystyrene (EPS) and represents the baseline performance of current common practice. Another assembly was built with 20 mm (0.7 inch) vacuum insulation panels encased in the equivalent thickness of EPS to represent a high RSI-value retrofit. The thermal performance was evaluated using a guarded hot box facility at Carleton University and the in-situ Building Envelope Test Hut at CanmetENERGY-Ottawa. The temperature, humidity and moisture content in the sheathing …
A Review Of Microgrid Energy Systems,
2018
University of Maryland
A Review Of Microgrid Energy Systems, Lei Gao, Yunho Hwang, Reinhard Radermacher
International Building Physics Conference 2018
Microgrid combined cooling, heating and power energy systems are under intensive investigation owing to expansion of renewable energy generation and development of advanced technologies in distributed energy generation. Multi-generation systems serve as one of the core parts in any microgrid energy systems. This review paper presents the summary of state-of-the-art technologies in these multi-generation systems. The first part introduces the energy structure based on energy sources and the latest renewable energy harvesting technologies for solar, biomass and geothermal energy. In the second part, prime movers, including small-scale ones used in a microgrid energy system, are summarized. The third part shows …
Comparison Between Qualitative And Quantitative Measurement In Assessing Thermal Comfort In An Elementary School,
2018
Torti Gallas and Partner
Comparison Between Qualitative And Quantitative Measurement In Assessing Thermal Comfort In An Elementary School, Boyu Li, Ming Hu, Greg Goldstein
International Building Physics Conference 2018
We compare qualitative and quantitative measurements to assess an elementary school building’s thermal comfort. Quantitative measurements of the physical environment are useful but not sufficient, since different people respond differently in the same indoor environment. A qualitative survey of the school employees shows the thermal comfort level has a 3.73 out of 7 score and 40% of subjects rated it unsatisfactory, even though the temperature and humidity level are measured within the comfort range recommended by ASHERA 90.1 – 2004. This gap occurs because human metabolism is not taken into account in current design guidelines, even though there is a …
Comparison Of Daylighting Simulation Workflows And Results Using Plugins For Bim And 3d Modeling Programs: Application On Early Phases Of Design Process,
2018
Federal University of Minas Gerais
Comparison Of Daylighting Simulation Workflows And Results Using Plugins For Bim And 3d Modeling Programs: Application On Early Phases Of Design Process, Marina Da Silva Garcia, Maíra Louise Martins De Freitas, Roberta Vieira Gonçalves De Souza, Ana Carolina De Oliveira Veloso
International Building Physics Conference 2018
The present paper investigated the application of the daylighting analysis features of the Insight BIM plugin, comparatively to DIVA, a plugin for a 3D Nurbs modeling software. Considering the early phases of the design process, workflows, simulation results and processing times were analyzed, focusing on the prediction of static (illuminance level) and dynamic (sDA300,50%) metrics. Simulations on both tools were performed in the context of analyzing the daylight behavior in a deep office room model, with and without light shelves. Results indicate that Insight has limitations compared to DIVA, especially concerning input data configuration flexibility. Simulation results presented significant similarity …
Prediction Of The Long-Term Performance Of Vacuum Insulation Panel Installed In Real Building Environments,
2018
Kyoto University; Asahi Fiber Glass Co., Ltd. Kanagawa
Prediction Of The Long-Term Performance Of Vacuum Insulation Panel Installed In Real Building Environments, Hideya Yamamoto, Daisuke Ogura
International Building Physics Conference 2018
Vacuum insulation panels (VIPs) are high-performance insulating materials constructed by covering a core and adsorbent with an envelope and evacuating the air from the inside. VIPs have used to enhance the energy efficiency of devices including refrigerators, vending machines, and cooler boxes. In order to apply VIPs as heat-insulation materials in buildings and houses, it is necessary to predict the long-term performance of the VIPs and verify the accuracy of the prediction using actual measurements. VIPs using glass fiber as a core material are spreading in Japan, and VIPs using glass fiber core material as the core is also likely …
Super Insulation Material In District Heating Pipes,
2018
Chalmers University of technology
Super Insulation Material In District Heating Pipes, Bijan Adl-Zarrabi
International Building Physics Conference 2018
In Swedish district heating systems, 10% of the produced energy is lost at the distribution network. It is of interest to lower the energy losses both for economic and environmental reasons. Since 2011 the feasibility of using superinsulation material for insulation of the district heating pipes were studied. Apparent thermal conductivity and long term performance of vacuum panels has been identified has the crucial challenge for using vacuum insulation panels. The estimated life time of a vacuum panel in building applications at 90 °C is about 50 years. The life time estimation is based on the climate condition valid for …
Super Insulation Materials In The Building Sector: Field Studies And Future Challenges,
2018
Chalmers University of Technology
Super Insulation Materials In The Building Sector: Field Studies And Future Challenges, Pär Johansson, Bijan Adl-Zarrabi
International Building Physics Conference 2018
The global rate of improvement in energy efficiency have to be increased to reach the UN sustainable development goals by 2030. Super insulation materials (SIM) can maintain the same thermal transmittance with a thinner insulation layer compared to conventional insulation materials. Recommendations and experiences from practical applications are needed to raise the knowledge and awareness of using SIM in buildings. Evidences related to real-condition performance need to be presented and independently assessed. The aim of this paper is to describe the state-of-the-art in the area of SIM in building applications based on monitoring data related to long-term performance of vacuum …
Evaluation Of The Impact Of Phase Change Humidity Control Material On Energy Performance Of Office Buildings,
2018
Nanjing University
Evaluation Of The Impact Of Phase Change Humidity Control Material On Energy Performance Of Office Buildings, Zhimin Wu, Menghao Qin, Mingjie Zhang
International Building Physics Conference 2018
Phase change humidity control material (PCHCM) is a new kind of composite made of high performance PCM microcapsules and diatomite. The PCHCM composite can moderate the hygrothermal variations by absorbing or releasing both heat and moisture and significantly reduce the peak/valley values of indoor temperature and relative humidity. In this paper, a novel model is developed to evaluate the energy performance of office buildings with PCHCM. The model is validated by a series of experiments, and then applied to investigate the effect of PCHCM on energy consumption in different typical climates worldwide (i.e. Beijing, Paris, Atlanta, and Guangzhou). Results show …
Psychrometer Method To Measure The Moisture Retention Curves Of Porous Building Materials In The Full Humidity Range,
2018
KU Leuven
Psychrometer Method To Measure The Moisture Retention Curves Of Porous Building Materials In The Full Humidity Range, Chi Feng, Maria Fredriksson, Hans Janssen
International Building Physics Conference 2018
Moisture retention curves describe the moisture storage property of porous building materials. Currently available experimental methods for measuring moisture retention curves are often demanding in equipment and moreover not always suited for the adsorption process in most of the capillary moisture content range. This paper proposes a novel and simple technique – the psychrometer method – and validates it by the tests on calcium silicate and ceramic brick. In this experiment the moisture content of the samples experiencing adsorption and desorption processes is determined gravimetrically, while the corresponding capillary pressures in the samples are measured with a chilled-mirror dew-point psychrometer. …
Semi-Permeable Membrane Experiment For Unsaturated Liquid Permeability Of Building Materials: Potential And Practice,
2018
KU Leuven
Semi-Permeable Membrane Experiment For Unsaturated Liquid Permeability Of Building Materials: Potential And Practice, Chi Feng, Hans Janssen
International Building Physics Conference 2018
The unsaturated liquid permeability is a crucial hygric property of porous building materials. Its direct measurement is very challenging however, because currently available experimental protocols are either demanding in test facilities, complicated in data processing, or limited in moisture content range. Inspired by the osmosis phenomenon, we study the possibility to apply semi-permeable membranes for directly measuring the liquid permeability of porous building materials. The key principle is studied profoundly and a simple experimental set-up is constructed. Trial tests on calcium silicate insulation and autoclaved aerated concrete are performed. Results show that the experimental set-up can be used to measure …
Evaluating The Energy Consumption And Heat Loss In The Hot Water Supply And Heating Systems Of A Nursing Home,
2018
Kyoto University
Evaluating The Energy Consumption And Heat Loss In The Hot Water Supply And Heating Systems Of A Nursing Home, Kana Inamoto, Chiemi Iba, Shuichi Hokoi, Daisuke Ogura, Satoru Takada
International Building Physics Conference 2018
The demand for nursing homes has increased recently due to an increase in the aging population in Japan. Nursing homes are generally equipped with hot water supply and heating systems for bathing, preparing meals, and heating rooms. This equipment utilizes a considerable amount of energy. Few studies have measured heat loss from the hot water supply and heating systems in such facilities. This study evaluated the hot water supply and heating systems of a nursing home located in a cold climate area in Japan. The temperature and flow rate of the hot water were continuously measured, and the energy consumption …
The Energy Saving Performance Of Heat Recovery Ventilation System In Residential Buildings In The Summer Of Hot-Summer And Cold-Winter Zone In China,
2018
Nanjing University
The Energy Saving Performance Of Heat Recovery Ventilation System In Residential Buildings In The Summer Of Hot-Summer And Cold-Winter Zone In China, Siyuan Cheng, Yao Ma, Menghao Qin
International Building Physics Conference 2018
The rapid increase in space cooling and heating demand in recent years in the hot-summer and cold-winter (HSCW) zone in China (the most developed area in China) requires technology to be as efficient as possible, consuming the lowest amount of energy necessary. Heat recovery ventilation (HRV) system can meet this demand by lowering the building energy demand by pre-heating or pre-cooling. However, the climate in HSCW zone is humid and rainy all the year round, which may affect the energy performance of HRV system. The current research focuses on field measurements of the performance of HRV system in a test …
Impacts Of Climate Change And Its Uncertainties On The Renewable Energy Generation And Energy Demand In Urban Areas,
2018
Lund University, Queensland University of Technology, Chalmers University of Technology
Impacts Of Climate Change And Its Uncertainties On The Renewable Energy Generation And Energy Demand In Urban Areas, Vahid M. Nik, Yuchen Yang, Bijan Adl-Zarrabi
International Building Physics Conference 2018
This work investigates the effects of future climate uncertainties in calculating the heating and cooling demand of buildings and estimating potentials for renewable energy generation (solar PV and wind). The building stock of Lund in Sweden is considered for energy simulations and for future climate, the most recent outputs of RCA4, which is the 4th generation of the Rossby Centre regional climate model (RCM), is used considering several two representative concentration pathways (RCPs) and four global climate models (GCMs). Simulations and assessment are performed for three 30-year time periods, from 2010 until 2099. Through comparing distributions of data sets, it …
The Impact Of Physical Environments In Satisfaction In Shopping Centers,
2018
Tianjin University
The Impact Of Physical Environments In Satisfaction In Shopping Centers, Rui Dang, Lai Wei, Ye Yuan, Gang Liu
International Building Physics Conference 2018
Lighting, thermal and acoustic are three main components of indoor physical environments affecting people’s satisfaction, productivity and health. Good physical environments in shopping centers not only improve the environment atmosphere but also increase the customers’ satisfaction. This study aims to find correlations between the physical environments and the satisfaction levels. Firstly, an objective measurement of physical environments had been carried out in four shopping centers. Then, a subjective evaluation was carried out in a real scene laboratory by changing four kinds of illuminance and three types of Correlated Color Temperatures (CCTs), which aims to find the relationship between the lighting …
Existing Energy Performance And The Potential Of Simulation In School Buildings – A Review,
2018
University of Maryland
Existing Energy Performance And The Potential Of Simulation In School Buildings – A Review, Ming Hu
International Building Physics Conference 2018
The objective of this paper is to present finding of existing building performance assessment for educational buildings and related energy simulation tools with a focus on K-12 buildings. First, the paper examines the current status of energy performance in educational buildings and existing simulation tools used in building energy retrofit. Then, the paper summarizes the obstacles to conducting energy simulation for school buildings, gaps and weaknesses in existing tools will be summarized, and potential opportunities for a comprehensive tool will be outlined. Last, the paper identifies the particular needs of educational buildings, and a set of criteria and requirements for …
Validation Of The En 15193:2017 Calculation Method To Estimate The Daylight Supply In A Building: Comparison With Dynamic Climate-Based Simulations,
2018
Politecnico di Torino
Validation Of The En 15193:2017 Calculation Method To Estimate The Daylight Supply In A Building: Comparison With Dynamic Climate-Based Simulations, Valerio Roberto Maria Lo Verso, Argun Paragamyan, Anna Pellegrino
International Building Physics Conference 2018
This paper compares a simplified method to calculate the daylight factor and the annual daylight contribution in a space to the output of dynamic daylighting simulations. The simplified calculation method is the one implemented in the European Standard EN 15193 for the calculation of the energy demand for lighting in buildings, while the tool for dynamic simulations is Daysim (managed through DIVA-for-Rhino). The analysis was carried out by applying the two approaches to a reference office room, which was assumed to be located in different sites and having different window areas, with different orientations, both in the absence and in …
Moisture Monitoring Of Wood-Frame Walls With And Without Exterior Insulation In A Midwestern U.S. Cold Climate,
2018
U.S. Forest Products Laboratory, Madison
Moisture Monitoring Of Wood-Frame Walls With And Without Exterior Insulation In A Midwestern U.S. Cold Climate, Samuel V. Glass, C. R. Boardman, Borjen Yeh, Kingston Chow
International Building Physics Conference 2018
Continuous exterior insulation is becoming more common in North American above-grade walls in both retrofit applications and new construction, as a means to improve the thermal performance of wall assemblies. Although moisture performance of wood-frame wall assemblies has been studied extensively, the drying capability of wall assemblies with exterior insulation and an interior vapor retarder in cold climates is not well characterized. This study monitored the hygrothermal performance of wall assemblies with and without exterior insulation under high and low interior humidity conditions and with intentional wetting of the wood structural panel sheathing. Moisture content and temperature of standard 38 …
Studying The Impact Of Local Urban Heat Islands On The Space Cooling Demand Of Buildings Using Coupled Cfd And Building Energy Simulations,
2018
Empa; ETH Zurich
Studying The Impact Of Local Urban Heat Islands On The Space Cooling Demand Of Buildings Using Coupled Cfd And Building Energy Simulations, Jonas Allegrini, Jan Carmeliet
International Building Physics Conference 2018
Surface as well as air temperatures are due to the urban heat island effect higher in urban compared to their surrounding rural areas. These increased temperatures have a strong impact on the building energy performance in urban environments and thermal comfort as well as health of inhabitants of these environments. At smaller scales, local heat islands are formed within urban environments, which have the same negative impacts. In this study, we investigate the influence of local heat islands on the space cooling demand of buildings. Commonly, climate information from one weather station is used for building performance simulations within a …
