How can we reduce fuel consumption, costs and emissions significantly? This question is troubling many ship owners now that freight rates are low and bunker costs are high. On M/V Bore Sea, a shaft generator combined with a VACON® AC drive is one key element in improving energy-efficiency.

1. Vacon case study Bore ltd
www.vacon.com1
Photo courtesy of Bore Ltd
RoFlex®
vessel with energy efficient
shaft generator configuration
Client name: WE Tech Solutions Oy and Bore Ltd
Segment: Marine & Offshore
Products used: VACON®
NXP
Location: Helsinki, Finland

2. Vacon case study Bore ltd
www.vacon.com2
Key facts of client:
• M/V Bore Sea one of two RoFlex vessels ordered by Bore Ltd
from Flensburger Schiffbau-Gesellschaft in Germany
• RoRo vessel designed for flexible cargo solutions to provide
easy access and low fuel consumption

3. Vacon case study Bore ltd
www.vacon.com3
Challenge:
• WE Tech Solutions Oy given the task of providing a solution
to optimize main propulsion machinery and improve energy
efficiency
• Global economic crisis has meant that freight rates are low
and bunker costs are high making it even harder to comply
with requirements.
• Constant voltage and frequency requirements of ship grid
sets limits on engine speed

4. Vacon case study Bore ltd
www.vacon.com4
Solution:
• Solution based on VACON®
NXP Grid
Converter technology between shaft
generator and the ship’s electrical network,
allows for large variation in main engine
speed
• Power still delivered with constant
voltage and frequency to electrical
network

5. Vacon case study Bore ltd
www.vacon.com5
Testimonial:
“We’re very pleased with the improved energy efficiency achieved
through the various technical solutions used on M/V Bore Sea.
Data analyses verify that the WE Tech Solutions’ shaft generator
with VACON®
AC drives brings savings of approximately 10% in fuel
costs. Given that fuel costs are about EUR500 per tonne, the annual
cost savings are significant, and on top of that CO2 emissions are
also cut by approximately 2000 tonnes.”
Jörgen Mansnerus
VP Marine Management
Bore Ltd
For full story:
http://www.vacon.com/Vacon/media/References/Bore-Sea--RoFlex-vessel-with-energy-
efficient-shaft-generator-configuration/
Story first published 8th April 2013