M/S Gabriella is a cruise ferry owned by Viking Lines built in 1992. It operates the route between Stockholm and Helsinki. The ship has a length of 169 meters and carries 2400 passengers and 400 cars. It has a max. speed of 21.5 knots. 

eMarines solution for M/S Gabriella consists of optimization and automatization of HVAC, pump control, and engine room ventilation. A control system was also programmed for this solution to increase the ease of use and more efficiently target comfort and energy saving. All work was performed during regular operations with no need to disrupt or dry dock the vessel.

CONTROL SYSTEM
A new control system for HVAC, Pre- and Re-heat heating, pumps, and chillers where installed. The control system from Kongsberg was reprogrammed for more economical use of the Engine Room Ventilation with VFDs. The control system was adapted specifically for M/S Gabriella and targets energy consumption, comfort, and ease of use.

HVAC
For the HVAC unit an installation of 21 drives was made for Cabin-, Public-, and Service-units each with their own individual regulation by, temperature, Co2 or/and Humidity. 

Recirculation dampers and VVX were included in the steering to achieve the most economical drift while increasing comfort. This is supervised by a fully automated control system with a focus on board climate and energy performance

ENGINE ROOM VENTILATION
Nine drives were installed for ME Room, AE Room, and Separator Room. The new VFDs are integrated into the control system from Kongsberg, reprogrammed to regulate temperature and differential pressure to keep the lowest energy consumption while keeping the climate in the engine room areas within required values. 

CARGO DECK VENTILATION
Four VFDs were installed on the dirivent fans. The dirivent fans are manually controlled in the new control system.  

PUMPS
16 Drives were installed for Re-Heat, HT ME, ME & AE FO Booster, AE Prelub, FO Feed, FO Booster, AC SW. Temperature-, pressure- and differential pressure control. 

AC SW, Pre- and Re-Heating pumps are integrated into the new control system and the rest of the pumps are installed as stand-alone solutions. 

HEAT RECOVERY
The original heat recovery system from ME Cooling water was rebuilt and new valves and sensors were installed. The system was integrated into the new control system.