scholarly journals Designing a Photovoltaic Solar Energy System for a Commercial Building. Case Study: Rosa Park Hotel in Khartoum-Sudan

Author(s):  
Asim M. Widatalla ◽  
Heimo Zinko
Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3195
Author(s):  
Ming Tao ◽  
Yanzhe Yu ◽  
Huan Zhang ◽  
Tianzhen Ye ◽  
Shijun You ◽  
...  

Solar energy-gas-fired boiler heating systems attract widespread attention due to their eco-friendly technologies and reasonable prices. In order to promote the application of a solar energy-gas-fired boiler system for decentralized heating, this study proposed a holistic method to optimize the combination of equipment specifications and control strategies of the system. A detailed mathematical model of the hybrid energy system was developed and validated by experiments to simulate various operating conditions and evaluate the optimal design results. A case study was conducted in Tianjin, China, and optimal schemes were obtained. The influence of different factors on the system’s annual comprehensive energy efficiency ratio (AEER) and annual cost (AC) were studied by sensitivity analysis; the results showed that the solar collector area was extremely valuable for the optimization of AEER and AC. The results of this study provide a reference for the optimization design of the solar energy-gas-fired boiler system, which is beneficial to the promotion of the utilization of solar energy.


2021 ◽  
Vol 1 (2) ◽  
pp. 175-181
Author(s):  
Martha Aznury ◽  
Muhammad Delika Maulidi ◽  
Selastia Yuliati

Tanaman Kelor adalah salah satu tanaman paling luar biasa yang pernah ditemukan. Salah satu khasiat yang bisa diambil dari pohon kelor terdapat pada daunnya. Daun kelor yang sudah dikeringkan memiliki kandungan gizi yang lebih banyak. Mengingat hal tersebut, maka dirancanglah alat photovoltaic tray dryer yang merupakan alat pengering yang memanfaatkan sinar matahari melalui Photovoltaic Solar Energy System (SESF). Photovoltaic tray dryer dengan kapasitas empat rak dengan berat 100 gram daun kelor per rak. Sebelum melakukan proses pengeringan, daun kelor dilakukan pengujian kadar air awal. Proses pengeringan dilakukan pada variasi waktu yaitu 30, 60, 90, 120, 150, 180, 210, dan 240 menit selama empat jam pada pengeringan dengan suhu 60°C. Setiap 30 menit daun kelor ditimbang. pada rak 1, 2, 3 dan 4 untuk menentukan kadar air. Kadar air daun kelor kering yang diharapkan setelah dikeringkan kurang dari 10%. Kadar air daun kelor pada tiap nampan mulai dari rak 3, 2, 2, dan 4  masing-masing adalah42,48%, 44,16%, 64,80% dan 69,92%. Efisiensi pengeringan mengalami penurunan, dengan efisiensi 30 menit sebesar 26,99% dan efisiensi 240 menit sebesar 14,28%.


2021 ◽  
Vol 5 (1) ◽  
pp. 20200076
Author(s):  
Hagar Alm El Din Mohamad ◽  
M. H. A. Amr ◽  
A. A. Bastawissi ◽  
A. E. Bastawissi ◽  
Hitesh Panchal ◽  
...  

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