Biomass gasification is one of the promising technologies to produce energy from the renewable energy sources, and the downdraft biomass gasifier is a widely used biomass energy conversion device. Among the various components of a gasifier, the position and the inclination of air nozzle have a vital role in the generation of producer gas. Therefore, a proper design is needed to fix the position and angle of the air nozzle. Keeping the above aspects, the present work focuses on the numerical simulation to predict the appropriate position and inclination of the air nozzle in a 50kWth imbert type downdraft gasifier by the species transport approach. The nozzle inclination varies from 0°, 20°, 30°, 45° and 60°, and the nozzle position is considered from 50mm, 100mm, 150mm and 200mm respectively. Experiments were also conducted to validate the numerical study. Both the studies show that the nozzle inclination at 45° and its position at 100mm above the reduction zone gives a reasonable composition of producer gas.
The prediction of the performance of different biomass energy sources in gasifiers is an important area of study for the implementation of this technology in various applications, relevant to remote villages. This paper presents the experimental studies conducted on a 50 kW imbert downdraft gasifier with wood and rubber seed kernel which are available abundantly in villages close to hilly regions of South India. The influence of equivalence ratio on the species concentration, gas production rate, HHV of producer gas and gasifier conversion efficiency are discussed. The experimental study shows that the rubber seed kernel can be effectively used as feedstock in biomass gasifiers to meet the decentralized heat and power applications of rural villages.
The vapour compression refrigeration system is an important one among other thermal systems and consumes more energy. The efforts have been made in many ways to enhance the energy efficiency of refrigeration system from various points of view, including energy efficient refrigerants, replacing existing components, using phase change materials in the condenser and evaporator and adding nano-materials to the refrigerants. This work explores and describes the improvement of energy efficiency of the refrigeration system through the application of the phase change material between wall and coil of the evaporator cabin. The experimental results showed significant effects on system performance such as coefficient of performance increased by 7.1%, per energy consumption decreased by 6.7% and temperature variations were also relatively lower inside the freezer cabinet. This proposed concept would be useful in the event of power failures that are very usual in low grid reliability locations.
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