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This paper studies the power consumption and supply in an islanded power system (IPS) with high penetration of air conditioning load. The characteristics and behaviors of the loads in the IPS are researched and analyzed. Based on the power study, a new source and load management (SLM) system is designed to improve the power quality and energy/fuel efficiency in the power systems. In this paper, at...
This paper proposed an improved thermal-circuit model for power transformer hot-spot temperature prediction with dynamic loading. The influences of solar radiation and the environmental temperature on the heat dissipation were also considered. When calculating the heat dissipation from the transformer tank to surroundings, the average oil temperature was selected as the node value in the thermal circuit...
Photovoltaic array is the base of the photovoltaic power system. To use the PV battery array efficiently and properly and to protect it, it is important to build an accurate Photovoltaic array model and to analyze the characteristics of the PV array under different circumstances. The characteristics of mono-crystalline silicon, poly-crystalline silicon and amorphous silicon PV modules' basic electrical...
Five parts including environment air supply duct, air supply structure, display cabinet, air return structure and environment air return duct were integrated and the modified two fluid model was employed to simulate the air flow and heat transfer in a vertical display cabinet with environment air supply. The temperature field characteristics were analyzed and the predicted temperatures were compared...
The supplementary water volume was researched when the reclaimed water was taken as the supplement of the landscape lake on the premise of the water quality standard. According to the analysis of the problems of using reclaimed water as the supplement of the landscape water, a improved model to caculate the water environmental capacity was established. Then the model was proved by the experiment....
The effect of temperature, harmonic ration, surfactant and shearing to fuel oil prepared by blending heavy oil and coal tar were detailedly studied. The results show that the viscosity of the blended oil increases gradually with the increase of harmonic ration from 2:1 to 7:1. It shows that the viscosity decrease rate can be divided into two sections with temperature increasing: In the first section,...
A kinetics model and a experimental rig for high temperature air coal gasification(HTAG) research were set up. The effects of important operation parameters, such as air-coal ratio, steam-coal ratio and specific gasification rate, on gasification indexes were studied through the kinetics model and gasifier. The results show that: the model can accurately predict the gas composition. And when air-coal...
The reynolds-averaged navier-stokes (RANS) method nowadays still is the major tool for gas turbine chamber (GTC) designers, but there is not a universal method in RANS GTC spray combustion simulation at present especially for the two- phase turbulent combustion. Usually there are two main steps in two-phase combustion: the liquid fuel evaporation and the gas mixture combustion. Thus, two widely used...
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