Abstract
The section of submarine cable that is installed in enclosed J-tubes represents a possible thermal limiting point along the export circuits of offshore wind farms (OWFs). To obtain higher continuous thermal ratings for J-tube systems, a ventilated design, realized by allowing for the flow of natural wind into the J-tube through vents, is considered in this paper. To evaluate the performance of this forced-ventilation design, a coupled three-dimensional (3D) numerical model is constructed using the computational fluid dynamics (CFD) technique. The CFD method is first successfully tested through comparisons with existing methods for enclosed J-tubes. Then, the cable rating for the ventilated design is determined using the CFD model and compared with the rating for the enclosed case. The results show that the cooling effect from forced ventilation is obvious, and the cable rating could be increased by up to 27.5% for a wind speed of 10 m/s. This improvement in rating is especially significant for OWFs where the export circuit output is limited by the cable rating in enclosed J-tubes.
Highlights
The development of offshore wind farms (OWFs) has rapidly advanced in recent years [1,2].For the OWF export system, a short section of submarine cable that is enclosed by a protective J-tube is laid between the sea floor and the offshore platform
The continuous rating results of enclosed J-tubes are calculated by different models, as described
0.9 produces an increase in rating of. This is mainly due to the dominance dominance of radiation in heat transfer inside the J-tube, and the increased emissivity produces a clear promotion of the inside heat exchange
Summary
The development of offshore wind farms (OWFs) has rapidly advanced in recent years [1,2]. A natural and straightforward method for increasing the cable rating would be through utilizing natural wind and allowing it to enter the J-tube. This can be done by opening some vents to the J-tube surfaces. It is expected that the cable in the J-tube would receive good cooling effects from forced ventilation This method has recently been tested in several Chinese OWFs. To evaluate the performance of this ventilated design, cable ratings in ventilated and enclosed.
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