Feasibility Study for Water-Electricity Cogeneration Using Integrated System of Concentrated Solar Power and Biofuel as Renewable Energy

Although Concentrated Solar Power (CSP) is one of the promising renewable energy technologies, several technical and economic challenges should be addressed. One of the major issues associated with Concentrated Solar Power technologies is the reliability limitation of the plant in the stand-alone configuration. Therefore, Concentrated Solar Power systems can be integrated with either thermal energy storage (TES) or a fossil-fuelled power assist FFPA). However, initial and maintenance costs and emission production are the main challenges for the developing countries. Integrating biofuel/biogas with CSP increases the renewability while solar irradiation is in absent. The paper main objective is to perform a feasibility study of integrating a biofuel based gas turbine power units in a Concentrated Solar Power plant for electricity and water cogeneration. The study includes the thermodynamics analysis and assessment of three biofuels, namely, Jatropha oil, castor oil, and palm oil. In addition, a cost lifecycle, sensitivity, and Monte Carlo analyses were performed. The results showed that Castor oil had a better performance in terms of efficiency and carbon dioxide emissions with a maximum daily freshwater production of 181,000 m3/day. The proposed integration resulted in a levelized cost of water that is lower than the water tariff in the UAE by $1.39/m3 with a payback period of 5 years

Electricity and Water Cogeneration Utilizing Aluminium Furnaces Waste Heat Integrating Thermal Storage Organic Rankine Cycle

High energy-intensive industries, including steel, chemicals, cement, and aluminium, contribute to about 75% of the industrial emissions of carbon dioxide globally and expelling large amounts of unrecovered waste heat into the atmosphere. Yet, there has been a challenge of studies that are conducted on recovering waste heat in the aluminium industry, especially in cast-house facilities, due to technical difficulties such as energy fluctuations in mass flow rate and temperature. In this study, the waste heat to power system is designed to generate power and freshwater in a cast-house facility with 18 furnaces by evaluating three methods in which the temporal waste heat from holding furnaces can be damped and exploited. These methods are: (1) implementing a temporal air injection, (2) optimising furnaces operation time shift, and (3) integrating sensible thermal heat storage. Organic Rankine Cycle is used for the waste heat to power conversion. The appropriate thermal energy storage design and a thermodynamic model of an Organic Rankine Cycle are investigated using temporal flue gas data that are collected on site from three furnaces. Reverse Osmosis technology is applied to produce water using the generated electricity. Results show that sensible heat thermal energy storage is the most suitable technology for damping the fluctuations of waste heat. By utilising waste heat from 18 remelting furnaces, a net power output of 323 kW can be produced to operate a Reverse Osmosis plant supplying 2419 m3 of fresh water daily, saving up to 2000 metric tons of carbon dioxide emissions annually. This study gives a comprehensive approach to deal with temporal waste heat in aluminium furnaces for smooth cogeneration

Islam dan Pendidikan Multikultural

Fenomena keragaman bagaikan pisau bermata dua, satu sisi memberikan dampak positif, yaitu kita memiliki kekayaan khasanah budaya yang beragam, akan tetapi sisi lain juga menimbulkan dampak negatif, karena keragaman pun dapat memicu konflik antar kelompok masyarakat yang pada gilirannya dapat menimbulkan instabilitas diberbagai bidang. Tujuan dari penelitian ini adalah ingin menghadirkan hubungan antara Islam dengan pendidikan multikultural. Metode yang digunakan dalam penelitian ini adalah metode deskriptif yaitu usaha peneliti untuk memecahkan masalah aktual (up to date) dengan jalan mengumpulkan data, menyusun atau mengklasifikasinya, menganalisis, dan menginterpretasikannya. Adapun teknik pengumpulan data dalam penelitian ini dengan menggunakan studi pustaka (library research) dimana peneliti mengumpulkan data dengan cara membaca, mempelajari, dan menganalisis jurnal-jurnal, buku, artikel dari peneliti terdahulu. Dari penelitian ini diharapkan lahirnya pemahaman bahwa Islam menetapkan adanya prinsip kesamaan dan dijadikan sebuah keyakinan pokok yang wajib diyakini oleh setiap umat Islam