Advanced Materials Research Vols. 875-877

Abstract: Dehumidification is considered as a key feature of HVAC systems for thermal comfort. Malaysia is located in the South East Asia region which has a sufficiently high temperature and humidity of approximately 80% RH. This requires a process which can reduce moisture in the air. Desiccant wheel is used to provide dehumidification. Desiccant wheel with model no. 770 WSG produced by NOVELAIRE having operating system 1:1 and maximum flow rate of 1500 cfm has been theoretically and experimentally analyzed for its performance. The results show good matching between theoretical and experimental results in term of sensible and latent effectiveness of dehumidification process as well as regeneration process. This desiccant wheel is capable of condensing water at 0.05kg_H2O/s and providing 3.3639 kW load reduction. With this significant load reduction, the component integrated in solar hybrid desiccant air-conditioning system can perform comfort cooling to area with high latent load such as hall, hyper market and commercial building.

Abstract: The demand for energy in continues to grow. This projected growth in demand has spurned several initiatives aimed at forestalling potential shortages. The focus is on influencing the energy consumption patterns in industry especially during peak demand times when energy supply systems are strained. Moreover, the modern society has become more sensitive to the impact on the environment. More consumers are aware today of the need to conserve energy. A typical platform will enable industry to reduce electricity usage. The ability to manage energy usage more effectively saves businesses. To ensure the provision of adequate, secure and cost-effective energy supplies, resources using the latest cost options are being utilized. To promote the efficient utilization of energy and discourage wasteful and non-productive patterns of energy consumption, the energy policy's approach is to rely heavily on industry to exercise efficiency in energy conversion, utilization and consumption through the implementation of awareness programs. This research will encourage engineers in industry to evaluate, investigate, discover and discuss the various opportunities available to manage energy in industry utilizing a well-structured and engineered methodology and to consider energy management initiatives seriously.

Abstract: ZnO was a promising n-type conductive semiconductor material for dye-sensitized solar cells. Stable and efficient preparation of high quality p-type ZnO films became the main difficulty in current research. In this paper, a nitrogen-doped ZnO columnar film on an indium tin oxide (ITO) substrate was successfully obtained by gas phase method. The absorption of visible light was improved by nitrogen-doped ZnO columnar films. This experiment provided a good strategy for the full utilization of solar energy.

Abstract: In this paper, we mainly talk about two kinds of ZnO nanostructure materials which are rod and flower structure by hydrothermal growth as photoanode of quantum dot sensitized solar cells (QDSSCs). Using chemical bath deposition to assemble CdS quantum dots onto ZnO nanostructure materials, and after different CBD cycles we could get the cell parameters of different CBD cycles respectively in their I-V curves, from which we could see it is the flower structure that has the highest efficiency which is 0.346% after 9 CBD cycles and the short-circuit current is 2.88 mA/cm². Therefore, we could see that ZnO flower structure has a potential application in solar cell devices as the photoelectrode to gain higher photoelectric conversion efficiency (PCE).

Abstract: Dust represents one of the important environmental parameters that effect photovoltaic (PV) performance. PV performance may be considerably affected when dust particles are deposited on the PV panels. In this paper, the experimental data concerning the effect of three types of dust pollutants (red soil, ash and sand) on the performance of PV panels (mono-c, multi-c and a-Si technologies investigated) have been investigated. It is found that ash have the highest effect in comparison with other pollutants. Also, it is found that a-Si is performing better than mono-c and multi-c in dusty environment.

Abstract: The economic, energetic and ecological indicators of combustion of water-oil emulsions and water-coal dust suspensions on a test installation are presented in this paper.

Abstract: The paper presents the mathematical modeling of the wave energy capture process. The wave energy is transformed into torque by a device composed of multiple floating cylinders, which perform oscillating motions according to the wave parameters and to the constructive elements of a new patented device.

Abstract: Voltage sags and interruption are one of most important of power quality problems. They can influence performance of equipment such as induction motors. They are generally caused by short circuit faults in transmission and distribution systems which propagate in entire of power systems. When their appear at a motor terminal, its effects are the speed and the torque will decrease to a level lower than values of the normal and even the motor become stall if magnitude of the voltage sags and duration exceed certain limit. The voltage can return to nominal voltage after end of the voltage sag and interruption. The motor will experience re-acceleration to normal condition is accompanied by large inrush current. A study on induction motors was carried out to confirm these effects. Single-phase and three-phase of small induction motors were used for investigating the effects caused by symmetrical voltage sags and interruption through experimental and simulation.

Abstract: The defects of material, packaging process and layout in power electronic packaging modules can affect the temperature distribution. Defects such as the voids of the welding and the unreasonable layout will cause uneven distribution of the temperature field in the internal surface and the local hot spots will emerge. If the hot spots continued, the module will be damaged. In order to achieve the defect analysis based on the temperature field, a test system is designed. The infrared camera is used to measure the temperature distribution in the system. The system can test the temperature field distribution characteristics with different loads. The study provided a strong basis of defect analysis standards based on temperature field.

Abstract: The energy storage system (ESS) is playing an important role in the hybrid system. Because of the high power density of the supercapacitor (SC) and the high energy density of the battery, the hybrid ESS with the two energy storing devices is widely used in the hybrid vehicles. But the research on the hybrid ESS in hybrid construction machinery is nearly blank. According to the characteristics of the hybrid ESS, the structure applied to the hybrid construction machinery is put forward, and the power converter DC-DC is designed and simulated, too. The simulation results prove that the bidirectional DC-DC can meet the requirement of the hybrid ESS.