Evaluation of performance energy collection using five types of solar flat plate collector

Solar radiation is emitted from the sun and collected on the surface of the earth by solar collectors. Solar energy can be transformed into useful energy in the structure of thermal power. One of the foremosteconomic always is to reapheat by exploitationsolar Flat Plate Collector (FPC). The solar collector's function is to heat water from the atmosphere. Heated water can be used for domestic and industrial uses, etc. The types of FPCs involved in this study are, for the colour’s FPC (black collector versus white collector), material’s FPC (copper collector versus polypropylene collector) and glazing’s FPC (double glazing collector versus single glazing collector) by using the Energy Solar Trainer. The present work is aimed to predict the performance of FPC tested for three different days with different types of FPC using an application of water heating The sky was almost clear with an ambient temperature in the range 20o C-36.2o C. Readings are collected from 9.00 a.m. to 5.00 p.m. with the solar radiation intensity, I = 722 W/m2 and flow rate fixed at 2 Lm-1. The result shows that the efficiency of FPCs (colour, material and glazing), the colour’s FPC, and black collector is higher than white collector. While for material’s FPC, copper collector is higher than polypropylene collector. For the glazing’s FPC, double glazing collector is higher than single collector. For the overall FPCs efficiency, double glazing collector is the highest compared to others FPC

Utilizing natural fibre as a sustainable acoustic absorber

The availability of agricultural waste as sound absorptive materials can be used in indoor and outdoor application. This study aims the potential of natural fibre from agricultural waste as materials for measurement of sound absorption coefficient (SAC). The fibre selected in this study are oil palm, coconut and banana. The natural fibre samples were treated by alkaline treatment during processing stage. The mixture proportion with 95% of natural fibre and 5% of sodium hydroxide (NaOH) as a binder and all the samples follow the fixed ratio of 95:5 for every weight of selected natural fibre. Then, the treated and mixed natural fibre were put into a mould for compaction process to produce diameter of 100 mm and 30 mm with thickness of 20 mm and 30 mm, respectively. All natural fibre samples were tested using Impendence Tube Method (ITM) based on ASTM E1050-09. The tests were conducted according to standard ISO10534-2 with high frequency range and low frequency. As a result, samples of coconut fibre with 20 mm thickness showed a good SAC value at low frequency which is 0.31, meanwhile oil palm fibre with 30 mm thickness attained 0.41. For high frequency testing, coconut fibre sample of 20 mm thickness resulted the highest SAC value at 0.41 and oil palm fibre sample of 30 mm thickness had the highest SAC value which is 0.81. Therefore, natural fibre showed respectable potential as an absorption material for sound reduction