Since 2012 year, LED luminaires have been implemented for Naval vessels. As a study conducted for the light emitting diode(LED) equipment for the application to naval vessels, this study provides insights of LED specification suitable for the naval vessels application and verifies its validity.
In order to suggest the applicable lighting equipment specification to naval vessels, Korean Defense Specification, U.S. Navy Specification and Korean Industrial Standards are analyzed, and this study provides the optical, electrical, and environmental characteristics of LED equipments for the application to naval vessels. For the requirements related to human safety and optical aspects, Korean Industrial Standard and the Specification of Korean Register are adopted. In addition, considering the special nature of naval vessels, U.S. Navy Specification is used for the environmental requirements.
In order to verify the validity of applying the proposed requirements, lighting simulation, illuminance measurement, vibration measurement, noise measurement, electromagnetic interference test and temperature measurement were conducted, and the results proved the validity. Especially, to minimize the optical characteristics of fluorescent lighting equipment and LED equipment, which are the aspects related to ship crew’s vision, optical characteristics with respect to change of lighting equipment type were analyzed via lighting simulation on the bedrooms of crew and naval officers of the KDX-3 AEGIS Destroyer, and it was confirmed that the overall light does not have noticeable problem. Moreover, after the installation of the LED equipment to naval vessels, illumination intensity was determined to be appropriate to ship building specification based on the test runs. In addition, for smooth operation in ship environment, vibration specification has been proposed. In order to verify the validity of the vibration specification, the vibration level subjected to fluorescent lighting equipment was measured in the operating naval vessels, and it was confirmed that it is acceptable to apply the U.S. Defense Specification.
In estimating the life with respect to change in luminous flux, approximately 8.8% of luminous flux reduction occurs after about 35,000 hours of continuous operation, and there is no significant luminous flux drop until about 30,000 hours of operation. Luminous flux estimation using Arrhenius model showed similar results, and L70 can be calculated to approximately 90,000 hours based on this. Additional study is required using the LED equipments installed in the operating naval vessels.
Surface type and Flush type have 53% and 60% power consumption reduction respectively. Applying such measures to the calculation of the naval vessels in which LED luminaires are applied since 2012, it shows effect of reducing 4,899 fluorescent equipments. This is equivalent to approximately KRW 694 million of fuel cost reduction to generate power yearly. After the naval vessels was replaced with LED luminaires, maintenance(substitute) costs was reduced by KRW 0.12 million over five years. And lighting transformers capacity decreased by 57 kVA of the same type.
Finally, As increasing power conversion efficiency, Surface vessels and submarine have 8% and 17%, I will purpose DC distribution to surface vessel and LED luminaires for submarine as future research project.