13 Jul 2017
9:00
A103
S5: Energy – Energy Efficiency and Energy Conversion
| 1. Role of under-rib convection in in situ,reactant and liquid water flows and current density distributions for,polymer electrolyte membrane fuel cells | ||
| Vinh Nguyen Duy, Kanghoon Park and Hyung-Man Kim (INJE University, South Korea) | ||
| Novel flow-field approach by the under-rib convection (URC) aims to,enhance polymer electrolyte membrane fuel cell (PEMFC) performance. This,study presents the experimental and numerical results for single cells,with a new serpentine flow-field (SFF) that stimulates URC by adding,sub-channels and bypasses (SBs) to a conventional flow-field with five,passes and four turns on an active area of 25 cm2. To characterize the,role of under-rib convection for PEMFC performance, the,performance-related parameters of the SFF with SBs are compared,experimentally and numerically with those of conventional SFF without,SBs. In the experimental evaluation of PEMFC performance, the area of,the lower current density with the SFF without SBs become broader than,that with the SFF with SBs. In the case of the SFF without SBs, the,sub-channel changes the flow direction of the URC and the URC flow,direction converges to the sub-channel. The enhancement of URC can,reduce water flooding at the cathode and increase the electrochemical,reaction, thus improving both the cell performance and the operating,stability. URC would play an important role in improving PEMFC,performance, as well as increasing the fuel cell lifetime. | ||
| 2. Experimental Prediction of Shaded Solar Cells Hot-Spots | ||
| Tonko Garma and Mario Cvetković (University of Split, Croatia); Vedran Bandalo (Auswertungsstelle für Strahlendosimeter Helmholtz Zentrum München, Germany) | ||
| We present a method for estimating overheating of a partially covered,solar cell module by use of short-circuit current measurement combined,with infrared thermography. The resulting analysis allows for predictive,calculation of over-heating and thus prevention of damage to the solar,cell module due to partial shadow induced overheating. | ||
| 3. A Light Control Technique for Energy-Efficient Buildings in Visual Comfort Constrained Environment | ||
| Woonsik Lee, Hyejung Cho, Prudhvitej Immadi and Kwanwoo Song (Samsung Electronics, Korea) | ||
| This paper presents a visual comfort considered light control method for,energy savings in open-plan office and investigates its performance.,Simulation and pilot testing results show that more than 60% energy,savings could be achieved while providing recommended visual comfort,level for each user. Since the proposed algorithm saves energy,significantly compared to the previous light control policies and,methods, we can say that it’s a remarkable energy savings technology in,light control area. | ||
| 4. Contribution to Airflow Effect Investigation Over Photovoltaic Surfaces: Temperature and Velocity contours | ||
| Ivo Marinić-Kragić, Sandro Nižetić and Filip Grubišić Čabo (University of Split, Croatia); Agis M. Papadopoulos (Aristotle University of Thessaloniki, Greece) | ||
| In this paper, the effect of wind airflow over a monocrystalline,photovoltaic panel (PV) was examined in relation to general velocity and,temperature contours. The analysis was obtained using the developed,numerical CFD model that was validated by available experimental,results. The airflow velocity ranged from 0.5 m/s up to 4.0 m/s and the,gained results are specified for different longitudinal cross-sections,of the PV panel. The obtained results gave detailed insight into,velocity profiles and temperature stratification over the PV panel,surface, where specific discovered effects were addressed. The provided,research results in this paper are important for the development of a,novel or improved existing cooling techniques for PV panels where the,final effect is a targeted increase in average PV panel efficiency | ||
| 5. An Empirical Survey on the Awareness of Construction Developers about Green Buildings in Macedonia | ||
| Lihnida Stojanovska-Georgievska, Ivana Sandeva and Hristina Spasevska (University Ss Cyril and Methodius, the former Yugoslav Republic of Macedonia) | ||
| Green construction is becoming priority in developing a new scope to the,construction itself. It emerges from the inevitable need to raise the,environmental concern and to make effort to build sustainable, by,balancing between the conservation of the environment and maintaining,prosperity in development. Green design does not only make a positive,impact on public health and the environment, it also reduces operating,costs, enhances building and organizational marketability, increases,occupant productivity, and helps create a sustainable community. This,survey aims at determining the state of knowledge and awareness about,green buildings among most involved stakeholders. The survey targets the,basic understanding about green building and reveals the opinion about,the advances and possible barriers for regulated construction of green,buildings. This survey is conducted using the method of structured,questionnaires and is based on the responses of 181 construction,developers including designers, architects, civil engineers,,technicians, workers in construction industry, investors, as well as,legal representatives (decision makers). The results are discussed in,comprehensive manner, in order to analyze thoroughly the current state,of awareness about GB in Macedonia. | ||
| 6. Utilising Passive Indoor Localisation of People,and Energy Device Identification to Enhance the Intelligence of Smart,Home Systems | ||
| Emilio Mistretta, Al-Azhar Lalani and Johann Siau (University of Hertfordshire, United Kingdom) | ||
| In an era, that has seen an increase in smart home features around the,home, features are often different brands or a suite of select products.,With new developments in hardware smart wall socket design and the,convergence of data houses can begin to become more intelligent and,adapt to their occupants more dynamically. By having a socket that is,smart and can detect what device or appliance is plugged in and how much,power it is using a home control hub can use this data to provide many,benefits. In addition, a Passive indoor localisation system is proposed,to gain the ability to have a better understanding of where occupants,are in a house using radio frequency interference as a trigger for,detection. How can these two systems be brought together to achieve,intelligence in smart homes. |