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All Journal Nabla Dewantara : Jurnal Pendidikan Matematika IJIMCE : International Journal of Innovation in Mechanical Construction and Energy
Defri Pratama
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Automotive Engineering Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics

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PENGARUH STRATEGI RELATING, EXPERIENCING, APPLYING, COOPERATING, TRANSFERRING (REACT) TERHADAP KEMAMPUAN KONEKSI MATEMATIS SISWA SMP DHARMA BHAKTI PALEMBANG Defri Pratama; Eva Susanti
Nabla Dewantara Vol 4 No 2 (2019): Nabla Dewantara: Jurnal Pendidikan Matematika
Publisher : Universitas Tamansiswa Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51517/nd.v4i2.131

Abstract

Penelitian ini dilaksanakan dengan tujuan untuk melihat pengaruh pembelajaran dengan strategi Relating, Experiencing, Applying, Cooperating, Transferring (REACT) terhadap kemampuan koneksi matematis siswa di SMP Dharma Bhakti Palembang pada tahun ajaran 2016/2017. Penelitian ini dilakukan dengan tiga tahapan, yaitu tahap observasi dan perencanan, tahap pelaksanaan dan tahap evaluasi serta pelaporan. Berdasarkan hasil indikator kemampuan matematis siswa diperoleh hasil analisis data hasil tes koneksi matematis siswa materi pokok prisma pada kelas eksperimen maupun kelas kontrol. Pada tes akhir rata-rata untuk kelas eksperimen lebih baik daripada kelas kontrol, yaitu 79,2 dan 64,5. Sehingga disimpulkan ada pengaruh strategi pembelajaran Relating, Experiencing, Applying, Cooperating, Transferring (REACT) terhadap kemampuan koneksi matematis siswa SMP Dharma Bhakti Palembang.
Design Of Portable Cold Storage Using Solar Power Defri Pratama; Desmarita Leni; Dedi Erawadi; Hendri Candra Mayana
IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Vol. 1 No. 3 (2024): IJIMCE : International Journal of Innovation in Mechanical Construction and Ene
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/ijimce.v1i3.47

Abstract

This research aims to design and analyze a portable cold storage system that uses solar energy as the main power source. The research methods used include literature studies, system design, and design analysis to evaluate the performance of the cold storage being designed. The designed system has a volume of 2.93 liters with an operational temperature of -2°C, which requires a total energy requirement of 114,912 kWh per day to maintain storage temperature stability under external environmental conditions of 30°C. The solar panels used have an efficiency of 18% with a standard irradiation exposure of 1000 W/m², capable of producing 4,788 watts of power, which shows sufficient efficiency to meet the cold storage energy needs. Based on the analysis, it is estimated that 43.2 solar panels are needed to meet daily energy needs, which indicates the large scale of energy infrastructure needed to maintain cold storage operations 24 hours a day. In addition, to ensure operational continuity, especially at night or when exposure to sunlight is low, energy storage capacity in the form of batteries of 230 kWh is required so that the cold storage can function without interruption. The results of this research show that with proper planning, the use of renewable energy through solar power can be optimized to support the sustainability of cold storage operations, even in environments with significant energy availability challenges. This research makes an important contribution to the development of efficient and sustainable portable cold storage technology
Co-Authors Candra Mayana, Hendri Dedi Erawadi Desmarita Leni Eva Susanti