Put Investigation on the energy saving method using inverter driving for cooling pump at MMU training ship

Abstract

Put Investigation on the energy saving method using inverter driving for cooling pump at MMU training ship Myeong-Hwan Lim † ․Byong-Won Ahn*․Bu-Gi Kim** Abstract：The ships have a lot of electric machinery needed to supply electricity from the moment of launching coming out of dry dock to docking at jetty. Thus, the ships always have to use alternator and electric machinery that has low efficiency under the low load. Many government service ships like the MMU training ship have been spending lots of time at jetty rather than sailing at sea. These ships are operated under the condition of low load due to the operation of basic machinery at jetty and electric machineries are driven with the status of low efficiency. This paper would suggest the energy saving method for these ships. The investigation describes that shore connection is a great asset to these ships and that the flow rate control by adjusting revolution with the adoption of inverter is better than flow rate control by using throttle valve to save energy. The result is based on the investigation of cooling pump at MMU training ship. Key words：Saving energy(에너지 절감), Inverter(인버터), Cooling water pump(냉각수 펌프), Training ship(실습선)

Effects of Toshka Pumping Station Operations on Power Quality and Stability of Electrical Grid

“…The variable speed driving method using an inverter has been studied and shown to reduce energy by about 15 to 30% compared to the operation of constant speed operation, which controls the flow solely through the control valve at the discharge side without drive [3][4]. The variable speed driving method can increase energy efficiency but there is no evaluation index for variable speed pumps similar to the 'best efficiency point' of a constant speed pump due to the continuous changes in rotational speed [5].…”