Estimation of Ocean Thermal Energy Conversion Resources in the East of Malaysia

Thirugnana, Sathiabama T.; Jaafar, Azmi; Yasunaga, Takeshi; Nakaoka, Tsutomu; Ikegami, Yasuyuki; Su, Suriyanti

doi:10.3390/jmse9010022

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…The researchers concluded that the maximum net power from Ge-OTEC is estimated to be 32.5 MW. In a study by Thirugnana et al, [74], the power generated by a hybrid OTEC system suggested for deployment in the Malaysian EEZ near Sabah's coast was estimated. The results conclude that the system can generate power equal to or four times higher than the Malaysian government's target set in 2025.…”

Section: Otec Resource In Malaysiamentioning

confidence: 99%

Review of Resources from the Perspective of Wave, Tidal, and Ocean Thermal Energy Conversion

Fouzi Alsebai,

Hooi-Siang Kang,

Omar Yaakob

et al. 2023

ARASET

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The conversion of Ocean Renewable Energy (ORE) sources to electricity could meet increasing energy demand and diversify the energy supply in Malaysia. Possessing a long coastline overlooking the South China Sea (SCS) and the Malacca strait has encouraged the Malaysian government to promote ORE and assess available resources to reduce its dependence on fossil fuels. However, most of the previous attempts to assess the potential of Malaysian ORE resources have focused primarily on theoretical resource assessment, which in practice may not reflect the viability and suitability of the resource. Other technical and practical issues must be accounted for as well. This paper presents a brief description of ORE conversion technologies and reviews the existing studies on regional ORE resources in Malaysia with an emphasis dedicated to wave energy, tidal energy, and Ocean Thermal Energy Conversion (OTEC). It also highlights the essential technical and practical constraints limiting or excluding the utilization of ORE sources. While some ORE resources, particularly the OTEC, appear to be theoretically promising for exploitation in Malaysia, this review has shown a lack of precise resource mapping linked to socio-economic and environmental constraints.

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Section: Otec Resource In Malaysiamentioning

confidence: 99%

Review of Resources from the Perspective of Wave, Tidal, and Ocean Thermal Energy Conversion

Fouzi Alsebai,

Hooi-Siang Kang,

Omar Yaakob

et al. 2023

ARASET

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“…Working fluid Ammonia (NH3) [10] Gross turbine power 100-200 kW [15] Cold seawater 5 -8 °C [26] Seawater temperature difference at the condenser 5.8 °C [18] Warm seawater temperature 25.3-31.3 °C [27] Seawater temperature difference at the evaporator 3 °C [18] Refrigerant temperature at the evaporator outlet The numerical simulation was carried out in Matlab R2018a using the refrigerant's thermodynamic properties as obtained from CoolProp v6.1.3. At the evaporator's outlet, state 2 was used as the starting point for the calculation.…”

Section: Parameter Value Authormentioning

confidence: 99%

Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

Suruji,

Nasir,

Nik Mohd

et al. 2023

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Organic Rankine Cycle (ORC) applications include ocean thermal energy conversion (OTEC), in which mechanical work is generated from heat energy to rotate generators and generate electricity. The OTEC system heated and cooled its refrigerant by taking advantage of the relatively small temperature difference between the warmer surface seawater and the colder deep seawater. The low-temperature difference between seawater and the rest of the system meant that the thermal efficiency of the system was relatively low; to address this problem, the OTEC cycles needed to be revised. To increase the basic OTEC cycle's thermal efficiency by 3.3–4.0%, various modifications have been developed. Two such cycles are the Solar Boosted OTEC (SOTEC) cycle and the Ejector Pump cycle (EP-OTEC). While the two improvements alter the rotating turbine parameters in different ways, they can be combined to create an improved OTEC cycle through the use of thermodynamics. In this study, an algorithm for revised OTEC was developed using MATLAB, and the performance of the system after the modifications was further quantified. This SEP-OTEC cycle thermal efficiency gives a 1.2-fold improvement when compared to the previous OTEC cycle thermal efficiency, which was 3.1%.

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“…Apart from power generation, hybrid OTEC system, which is the latest and advanced OTEC technology, has the potential to be utilized for producing other side products such as desalinated water [2]. Furthermore, the deep seawater discharge used in an OTEC power plant could be exploited for the cultivation of blue economy for the benefits around island communities [3].This further highlights the OTEC's capabilities of fulfilling the United Nation (UN)'s Sustainable Development Goals (SDGs) such as goal 6 for Clean Water and Sanitation and goal 7 for Affordable and Clean Energy [4].…”

Section: Figure 1 Schematic Flow Diagram Of Hybrid Ocean Thermal Ener...mentioning

confidence: 99%

Evaluation of hybrid ocean thermal energy conversion system plantwide performance

Azam

Abidin

Husain

et al. 2022

J. Phys.: Conf. Ser.

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Ocean Thermal Energy Conversion (OTEC) is a renewable energy source in which energy is produced by converting the heat stored in the sea or the ocean thermal energy into valuable work, based on the temperature difference between the warm surface seawater and the cold deep seawater. One of the OTEC system requirements is to have a seawater temperature difference at a minimum of 20 °C within a depth of 1000 m below sea level. Recognizing the importance of optimum sea water temperature, several studies have been conducted to optimize the OTEC system. However, none of these studies was attempted under a hybrid ocean thermal energy conversion (H-OTEC) setup. A H-OTEC system is a combination of closed-cycle and open-cycle OTEC system. The objective of this study is to evaluate the performance of the H-OTEC process system based on the impact of seawater temperature variation by simulating H-OTEC process system. Aspen HYSYS was used as a chemical process simulation platform for conducting this study. After the model was completed, verification test was conducted before the simulated data was recorded. The data for the pump work input and the turbine work output were acquired to determine the net power output and system efficiency. The net power output, Carnot efficiency, and thermal efficiency were recorded approximately 1.39 kW, 5.7%, and 1.45%. The data for net power output and the efficiencies of the system was recorded for every 1 °C of increment in surface seawater temperature. The results showed that the net power output increased slightly by 0.5kW, with efficiency difference for both Carnot cycle and actual cycle, recorded to be less than 3% and 0.1% respectively.

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Estimation of Ocean Thermal Energy Conversion Resources in the East of Malaysia

Cited by 15 publications

References 14 publications

Review of Resources from the Perspective of Wave, Tidal, and Ocean Thermal Energy Conversion

Review of Resources from the Perspective of Wave, Tidal, and Ocean Thermal Energy Conversion

Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

Evaluation of hybrid ocean thermal energy conversion system plantwide performance

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