On the wave energy potential along the southern coast of Brazil

Abstract

The ocean wave energy resource is a real alternative to supply part of the energy demand in various countries, since some locations have a remarkable capacity to generate electricity. The objective of this study is to evaluate the energy resource of ocean waves in the coast of Rio Grande do Sul, the southern state of Brazil. This note presents the first results. The wave data used were collected in the sea area near the Port of Rio Grande during the years 1996 to 1999, amounting to sixteen months of monitoring. The data set was treated and grouped resulting information monthly, seasonal and annual basis. The annual average was found to be 8.6 kW per meter of wave front, reaching 14.0 kW per meter for the month of May and 4.0 kW per meter for the month of January. The results indicate good perspectives in obtaining power supplies.

100% Renewable Energy Supply for Brazil—The Role of Sector Coupling and Regional Development

“…The daily water inflow to hydropower plants is considered according to long-term averages over 1931-2013 [51]. As no measured data are available for wave power, we approximate monthly average output values based on [52], using an annual capacity factor of 0.3. In addition to retrofitting reservoir hydro stations by pumps, the model endogenous installation of storage can also include batteries and hydrogen storage.…”

Kinerja Model Fisik Konverter Energi Ombak Rangkaian Gear Searah pada Periode Ombak yang Bervariasi

“…Diantara sumber energi alternatif tersebut, energi ombak yang memiliki kandungan energi terbesar yang tersedia selama 24 jam, namun belum banyak di manfaatkan secara maksimal karena biaya per kWh belum layak secara ekonomis dengan teknologi konverter yang ada saat ini (Assis, et al, 2014).…”

“…Secara matematis, energi yang terkandung dalam ombak dapat diuraikan sebagai berikut (Falnes, 2004) dimana: E T = total energi ombak  = berat jenis air laut g = percepatan gravitasi a = amplitude ombak Aliran energi rata-rata adalah laju perubahan energi yang merambat per satuan panjang puncak ombak melalui bidang vertikal dan tegak lurus terhadap arah perambatan/propagasi. Besaran energi tersebut diperoleh dari hasil perkalian antara total energi E T dengan kecepatan (group velocity) C g (Assis, et al, 2014) (7) dimana: P = daya rata-rata untuk gelombang linier  = berat jenis air laut (1025 kg/m 3 ) H = tinggi ombak T = periode ombak Keadaan ombak di laut yang sesungguhnya dapat dimodelkan sebagai proses yang acak yang merupakan hasil superposisi dari beberapa ombak linier dengan parameter dan arah yang berbeda satu sama lain. Untuk itu parameter ombak seperti periode, tinggi, dan arah harus di kelola dengan metode statistik.…”

“…Parameter statistik yang dipergunakan adalah tinggi ombak yang signifikan (significant wave height) Hs dan periode ombak rata-rata. Energi yang terkandung di dalam ombak laut dinyatakan dengan Persamaan 8 (Assis, et al, 2014 (Masjono, 2016). Ilustrasi model matematis dapat dilihat pada Gambar 1.…”

Preliminary determination of the energy potential of ocean currents along the southern coast of Brazil

“…This article presents a preliminary determination of the energy potential for power generation from ocean currents along the coast of Rio Grande do Sul, the southernmost state of Brazil, based on data obtained with current meters, as described in the following chapters. This article also presents notes that contribute to the characterization of the system of ocean currents in the region as part of a project that aims to establish the feasibility of obtaining energy from the ocean [1].…”