scholarly journals Thermal Cycling in Converter IGBT Modules with Different Cooling Systems in Pitch- and Active Stall-Controlled Tidal Turbines

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6457
Author(s):  
Faisal Wani ◽  
Udai Shipurkar ◽  
Jianning Dong ◽  
Henk Polinder
Keyword(s):  
Thermal Cycling ◽  
Passive Cooling ◽  
Cooling Systems ◽  
Insulated Gate Bipolar Transistor ◽  
Tidal Turbines ◽  
Igbt Modules ◽  
Lifetime Analysis ◽  
Tidal Turbine ◽  
Stall Control ◽  
Passive Cooling Systems

This paper compares active and passive cooling systems in tidal turbine power electronic converters. The comparison is based on the lifetime of the IGBT (insulated gate bipolar transistor) power modules, calculated from the accumulated fatigue due to thermal cycling. The lifetime analysis accounts for the influence of site conditions, namely turbulence and surface waves. Results indicate that active cooling results in a significant improvement in IGBT lifetime over passive cooling. However, since passive cooling systems are inherently more reliable than active systems, passive systems can present a better solution overall, provided adequate lifetime values are achieved. On another note, the influence of pitch control and active speed stall control on the IGBT lifetime was also investigated. It is shown that the IGBT modules in pitch-controlled turbines are likely to have longer lifetimes than their counterparts in active stall-controlled turbines for the same power rating. Overall, it is demonstrated that passive cooling systems can provide adequate cooling in tidal turbine converters to last longer than the typical lifetime of tidal turbines (>25 years), both for pitch-controlled and active speed stall-controlled turbines.

scholarly journals Lifetime Analysis of IGBT Power Modules in Passively Cooled Tidal Turbine Converters

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1875
Author(s):  
Faisal Wani ◽  
Udai Shipurkar ◽  
Jianning Dong ◽  
Henk Polinder ◽  
Antonio Jarquin-Laguna ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Surface Waves ◽  
Stream Velocity ◽  
Insulated Gate Bipolar Transistor ◽  
Cost Of Energy ◽  
Igbt Modules ◽  
Lifetime Analysis ◽  
Tidal Turbine ◽  
Tidal Stream ◽  
The Impact

Thermal cycling is one of the major reasons for failure in power electronic converters. For submerged tidal turbine converters investigating this failure mode is critical in improving the reliability, and minimizing the cost of energy from tidal turbines. This paper considers a submerged tidal turbine converter which is passively cooled by seawater, and where the turbine has fixed-pitch blades. In this respect, this study is different from similar studies on wind turbine converters, which are mostly cooled by active methods, and where turbines are mostly pitch controlled. The main goal is to quantify the impact of surface waves and turbulence in tidal stream velocity on the lifetime of the converter IGBT (insulated gate bipolar transistor) modules. The lifetime model of the IGBT modules is based on the accumulation of fatigue due to thermal cycling. Results indicate that turbulence and surface waves can have a significant impact on the lifetime of the IGBT modules. Furthermore, to accelerate the speed of the lifetime calculation, this paper uses a modified approach by dividing the thermal models into low and high frequency models. The final calculated lifetime values suggest that relying on passive cooling could be adequate for the tidal converters as far as thermal cycling is concerned.

scholarly journals Development of Bioclimatic Design Tool for Oman Using Dry Bulb and Dew Point Temperatures Open Database

2017 ◽  
Vol 14 (2) ◽  
pp. 137
Author(s):  
Nasser Al-Azri ◽  
Y. Zurigat ◽  
N. Al-Rawahi
Keyword(s):  
Air Conditioning ◽  
Meteorological Data ◽  
Design Tool ◽  
Dew Point ◽  
Passive Cooling ◽  
Cooling Systems ◽  
Bioclimatic Design ◽  
Passive Cooling Systems

Bioclimatic charts are used by engineers and architects in implementing passive cooling systems and architectural optimization with respect to natural air conditioning. Conventionally, the development of these charts is based on the availability of typical meteorological year which requires a record of meteorological data that are rarely available in sufficient amounts. Bioclimatic charts in Oman were developed earlier by the authors for limited locations based on the available typical meteorological years. Using dry bulb and dew point temperatures only, bioclimatic charts are developed for Adam, Buraimi, Ibra, Muscat, Nizwa, Rustaq, Saiq, Salalah, Suhar and Sur. These charts are better representative of bioclimatic trends since their development is mainly based on the relevant parameters, namely dry bulb temperature and dew point.

scholarly journals When social practices produce space and create passive cooling systems in hot arid region

2022 ◽  
Vol 27 ◽  
pp. 932-944
Author(s):  
Ibtissame Benoudjafer
Keyword(s):  
Thermal Comfort ◽  
Arid Regions ◽  
Passive Cooling ◽  
Thermal Mass ◽  
Cooling Load ◽  
Cooling Systems ◽  
Cooling Strategy ◽  
Main Factors ◽  
Dry Climates ◽  
Passive Cooling Systems

Abstract. Practice social of people is the key to produce space and give a possibility to maintain thermal comfort and energy efficiency. The main objective of this research is to adapt the traditional strategies in the architecture actual, to achieved a thermal comfort and improve on reducing cooling load through the using of vernacular gait. Today, it is necessary to practice these systems in the current or conventional architecture of household. The study is especially for arid cities namely the region of Saoura, in the hot and dry climatic zone in Algeria, considered for this study. Two main factors is considered such as design and urban where taken into account in order to select the appropriate and specific passive cooling strategy. The results show that the passive cooling strategy of courtyard would be appropriate for arid regions, however a high thermal mass would be suitable for construction. In conclusion, this work made it possible to choose a suitable passive cooling strategy for all types of construction in hot and dry climates. Finally, this paper puts forward a set of recommendations to improve the passive design of future buildings in hot and arid climates.  

scholarly journals SISTEM SUBGROUND PASSIVE COOLING PADA GEREJA DI CIBUNUT, KUNINGAN, JAWA BARAT

2021 ◽  
Vol 5 (2) ◽  
pp. 177
Author(s):  
Inggit Musdinar Sayekti Sihing Yang Mawantu ◽  
Sri Kurniasih
Keyword(s):  
Data Collection ◽  
Cooling System ◽  
Passive Cooling ◽  
Cold Climates ◽  
Cooling Systems ◽  
Tropical Climates ◽  
Passive Cooling Systems ◽  
The Tropics ◽  
Passive Cooling System ◽  
The Church

Abstract: Subground passive cooling is a passive cooling technique that is carried out by flowing cold air in the ground into the room. The Pasio Christi Church in Cibunut, Kuningan, West Java was founded in 1965. Then the church implemented a passive cooling subground system through renovations carried out on May 11, 2018. This passive cooling system is usually carried out in areas with subtropical to cold climates, however Cibunut who has a tropical climate tries to implement this system. In fact, there is concern if the system is implemented in the tropics, such as humidity entering the system, causing fungal problems that can have an impact on health. . Therefore this research describes the application of the subground passive cooling system in tropical climates with the following steps: (i) data collection in the form of literature studies, (ii) identification of the subground passive cooling system of Cibunut Church, (iii) elaboration of theory regarding subground passive cooling, (iv) analysis of the application of subground passive cooling of the Cibunut church with the results of theoretical elaboration. This research is expected to be able to contribute in science, especially regarding the application of subground passive cooling systems in tropical climates.Abstrak: Subground passive cooling merupakan teknik pendinginan pasif yang dilakukan dengan mengalirkan udara dingin dalam tanah ke dalam ruangan. Gereja Pasio Christi di Cibunut, Kuningan, Jawa Barat didirikan sejak 1965. Lalu gereja ini menerapkan sistem subground passive cooling melalui renovasi yang dilakukan pada 11 Mei 2018. Sistem pendinginan pasif ini biasanya dilakukan pada wilayah dengan iklim subtropis hingga iklim dingin, namun demikian Cibunut yang beriklim tropis mencoba untuk menerapkan sistem ini. Padahal ada kekawatiran jika sistem ini diterapkan di wilayah tropis, seperti kelembaban yang masuk dalam sistem sehingga muncul permasalahan jamur yang dapat berdampak pada kesehatan. Oleh karena itu pada penelitian ini mendiskripsikan mengenai penerapan sistem subground passive cooling pada wilayah beriklim tropis dengan langkah-langkah sebagai berikut : (i) pengumpulan data dalam bentuk studi literatur, (ii) identifikasi sistem subground passive cooling Gereja Cibunut, (iii) elaborasi teori mengenai subground passive cooling, (iv) analisis penerapan subground passive cooling gereja Cibunut dengan hasil elaborasi teori. Dari penelitian ini diharapkan mampu memberikan sumbangsih dalam keilmuan terutama mengenai penerapan sistem subground passive cooling pada wilayah beriklim tropis.

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