Site Determination for OTEC Turbine Installation of 100 MW Capacity in North Bali Waters

Ilahude, Delyuzar; Yuningsih, Ai; Permanawati, Yani; Yosi, Mira; Zuraida, Rina; Annisa, Nur

doi:10.32693/bomg.35.1.2020.594

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…In this paper, an analysis of the potential location of marine heat was carried out by Research and Development Center for Marine Geology (MGI) in the northern waters of Bali Island. The site is at latitude 8°5'59" S and longitude 115°22'25"E, with the distance to land 5 km [24]. The research site is shown in figure 2.…”

Section: Ocean Thermal Resourcesmentioning

confidence: 99%

A study of the temperature distribution in the OTEC cold water pipe using a heat and mass transfer approach

Firmansyah,

Mukthasor,

Satrio

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The difference between sea water temperature at a depth of around 1000 m and sea water temperature at sea level is generally used as a parameter in the design of Ocean Thermal Energy Conversion (OTEC). In practice, electricity generation is determined by the difference between the temperature of the cold seawater coming out of the Cold Water Pipe (CWP) and the temperature of the seawater at the surface. The temperature of cold sea water increases due to heat transfer experienced by cold sea water flowing through the CWP, which comes into contact with surrounding sea water which has a higher temperature. This in turn provides a lower actual temperature difference, and therefore reduces the design power capacity. However, many previous studies did not consider these lower temperature differences. This may be acceptable for cases with practically small heat transfer such as CWP with low thermal conductivity combined with good insulation used in 1000 m CWP vertical floating systems. Unfortunately, this may not be the case for many of OTEC’s proposed alternative sites, which are located on land systems that require CWP lengths of five km or more. This raises the need for careful investigation to determine the temperature of the sea water coming out of the CWP, where it is necessary to calculate the temperature distribution of the cold sea water flowing through the CWP. This paper aims to estimate the temperature distribution of cold sea water flowing through the CWP and the increase in temperature of cold sea water leaving the CWP. Analysis based on the principles of mass and heat transfer was carried out in this research, where modelling was carried out numerically using a finite volume approach. For the case considered, the change in sea water temperature at CWP from depth to the surface occurs 1-3°C, which is the accumulation of each change in sea water depth. The results of this research illustrate that designing an OTEC system with a long CWP must consider the temperature distribution of cold sea water flowing through the CWP to produce a more realistic design.

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Section: Ocean Thermal Resourcesmentioning

confidence: 99%

A study of the temperature distribution in the OTEC cold water pipe using a heat and mass transfer approach

Firmansyah,

Mukthasor,

Satrio

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…In east Indonesia, the northern region of Bali emerges as a promising location for the implementation of OTEC systems. Researchers, such as Ilahude et al (2020), have conducted studies specifically focused on the potential for OTEC installations in North Bali. By utilizing annual temperature data obtained from HYCOM and employing (Uehara & Ikegami, 1990) equation to develop a temperature model, Ilahude's research reveals that the North Bali area exhibits a significant contrast in sea surface temperature compared to the deeper sea, ranging between 22°C and 25°C.…”

Section: B Ocean Thermal Energy Conversion (Otec)mentioning

confidence: 99%

Renewable Energy: Policy and Strategy

Ristiyanto Adiputra,

Muhammad Iqbal Habib,

Erwandi

et al. 2023

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Renewable energy is generally referred to energy that may be renewed. Recently, attention to the use of renewable energy has been increasing, including in Indonesia. Since renewable energy comes from nature and uses natural resources, Indonesia has considerable resources that can potentially be used to produce renewable energy. Responding to this, it is essential to see how renewable energy is utilized, which is discussed in this book. This book conveys the discussion of renewable energy from the perspective of Indonesia's condition. Chapters in the book address many aspects of new and renewable energy discourse, including technology, policy and regulation, financial strategy, and social aspects. Written by various qualified authors in each field, this book shows how collaboration is much needed in implementing the strategy and policy for the use of new and renewable energy in Indonesia. Renewable Energy: Policy and Strategy is hoped to be a valuable source of knowledge concerning new and renewable energy solutions. Several recommendations can be implemented, and this book is here to become a reference for policymakers in achieving the target of net zero emissions.

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“…Bali Sea is located on the northern part of Bali Island with a depth of up to 1500 m [1] and is influenced by the Makassar Indonesian Throughflow (ITF), monsoon currents, and the Indian Ocean through Lombok Strait [2]. Lombok Strait is one of the exit routes of ITF with the northern and central parts having a depth up to 1400 m. The southern part of the straitbetween Nusa Penida and Lombok Island, there is the Lombok Sill with a depth of about 250 m and suspected as internal waves generation area [3].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of internal waves in the Bali Sea from Sentinel-1A data and ocean modeling

Lukman,

Atmadipoera,

Nugroho

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Internal waves (IWs) that propagate into the Bali Sea are supposed to originate from the generating sill area in the southern part of the Lombok Strait. This study aims to investigate surface features and mechanism of IWs formation and propagation into the Bali Sea. The datasets are acquired from the Sentinel-1A imageries and CROCO model simulation. The results showed that solitary wave packets are spread over two areas: near Lombok Strait as generating area, and in the western and northern parts of the Bali Sea as propagating area. The length of IWs crests increased as they moved into the propagation area. The model showed that mixed semidiurnal tidal currents near the sill flow northward (southward) alternately during the flood (ebb) tidal period, resulting in the pycnocline deepening down to ~400 m near the northern sill area during the flood tide. Furthermore, the model demonstrated an alternating upward and downward movement of vertical currents components, associated with propagation of IWs’ crests and troughs along IWs pathway.

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Site Determination for OTEC Turbine Installation of 100 MW Capacity in North Bali Waters

Cited by 3 publications

References 14 publications

A study of the temperature distribution in the OTEC cold water pipe using a heat and mass transfer approach

A study of the temperature distribution in the OTEC cold water pipe using a heat and mass transfer approach

Renewable Energy: Policy and Strategy

Characteristics of internal waves in the Bali Sea from Sentinel-1A data and ocean modeling

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