Computational study on thermoacoustic heat engine for proposing a new method renewable technique

This paper investigates the correlation of thermal conductivity versus bulk density, porosity and compressive strength of metakaolin geopolymer for different mixing parameters (that are, alkali concentration, activator (AA) ratio and metakaolin/activator (MK/AA) ratio). Metakaolin was alkali-activated with NaOH and Na2SiO3 solution to produce geopolymer. Varying NaOH concentration (6M, 8M, 10M, 12 M and 14M), AA ratio (0.4, 0.6, 0.8, 1.0 and 1.2) and MK/AA ratio (0.6, 0.7, 0.8, 0.9 and 1.0) were used to study the effect on bulk density, porosity, compressive strength and thermal conductivity. Result showed that metakaolin geopolymer with maximum compressive strength (33 MPa), bulk density of 1680 kg/m3, porosity of 18% and thermal conductivity of 0.40 W/mK is achieved with alkali concentration of 10M, AA ratio of 1.0 and MK/AA ratio of 0.8. From the gradation analysis of the strength result, AA ratio is the most influential mixing parameter in determining the compressive strength. In contrast, MK/AA ratio significantly affected the thermal conductivity. From the Pearson correlation coefficient, TC had strong relationship with bulk density and porosity and poor relationship with compressive strength.

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Correlation of Thermal Conductivity Versus Bulk Density, Porosity and Compressive Strength of Metakaolin Geopolymer

Jaya

Yun-Ming

Cheng-Yong

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Single Objective Optimization of Net Zero Energy Residential Building in Tropical Climate

Leman

Sharif

Krizou

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The Building sector is the largest consumer of energy worldwide. Net Zero Energy Residential Building (NZERB) is one of the prudent approaches to reduce pressure on primary sources of energy. The main objective of this study is to use Taguchi simulation based on orthogonal arrays approach to optimize thermal envelope of a building, SEER value of HVAC system, lighting power density, and ventilation level to reduce the Building Energy Intensity (BEI) 50% lower than the base case building according to International Energy Conservation Codes 2015. In this study whole building energy simulation was performed by Hourly Analysis Energy Program and PVWatts calculator was used to estimate the size of the PV system for balancing the energy demand of the house. The results of Taguchi simulation approach show that by decreasing the U value of wall, windows, roof, floor to 0.1, 0.8, 0.1, 0.2 W/m2. °K respectively and ventilation rate 0.15 l/s-m2, lights of 110 lm/W and SEER of the HVAC system 4 (W/W option) reduce BEI from 147.78 kWh/m2/year for base case building to 67.085 kWh/m2/year for optimal design case. PV system size estimation was performed with PVWatts calculator. PV Watts recommended the size of 13kW DC rating system (open rack type) of 15% efficiency for the weather of Johor Bahru to meet the annual energy demand of the proposed optimal building design.

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Effect of Cascade Aerator Height and Flow Rate on Removal of Iron and Manganese from Groundwater at Rumah Nur Kasih

Razif

Zainol

Jamil

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The quality of groundwater at Rumah Nur Kasih consist high concentration of iron (6.12 mg/L) and manganese (0.56 mg/L). The groundwater only used for external usage such as cleaning purposes. In order to reduce iron and manganese, it is proposed cascade aerator system for oxidation process. The oxidation process can reduce iron and manganese in water by increasing the dissolved oxygen. Cascade aerator is greatly influenced by the flow rate along the step and the dimension of the cascade aerator. In this study, two lab scale cascade aerators with different in height of cascade were used to find the highest removal of iron and manganese. It was found out that the optimum flowrate for both cascade aerator was 22 ml/s. Model B with higher in height has higher dissolved oxygen and removal efficiency. The removal of iron and manganese for model B are 45.2% and 21.68% respectively. The removal of iron and manganese for model A are 39.95% and 12.09% respectively.

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Computational study on thermoacoustic heat engine for proposing a new method renewable technique

Cited by 11 publications

References 13 publications

Correlation of Thermal Conductivity Versus Bulk Density, Porosity and Compressive Strength of Metakaolin Geopolymer

Correlation of Thermal Conductivity Versus Bulk Density, Porosity and Compressive Strength of Metakaolin Geopolymer

Single Objective Optimization of Net Zero Energy Residential Building in Tropical Climate

Effect of Cascade Aerator Height and Flow Rate on Removal of Iron and Manganese from Groundwater at Rumah Nur Kasih

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