29 November 2013
KNUD E. HANSEN, in cooperation with Novenco Marine & Offshore A/S, has contracted with Carnival Cruise Line to install state-of-the-art HVAC upgrades on the Victory, Triumph, Conquest and Spirit Class cruise ships, in order to improve the overall operational efficiency of their fleet.
The Owner’s newbuilding requirements often specify excessive capacity for HVAC systems in order to ensure passenger comfort while cruising in tropical climates. This means that there is significant potential for operational optimization when the vessels are in less demanding climates or in transitional periods where there are fewer passengers on-board. Furthermore, the upgrade will ensure that the system is taking advantage of the simultaneous factor for persons and for various heat sources such as entertainment equipment, so that cooling capacity is transferred to the areas where needed. The basis of this technology, is to monitor the passenger flow and occupancy of each area. Ventilation is reduced to a minimum for unoccupied areas in order to save both electrical power and chilled water. Each area is controlled from a “Time Schedule”, but to maintain a comfortable climate in the areas, CO2 sensors detect the passenger flow, and avoid any discomfort if the passenger flow changes.
Up to 25 % efficiency gains may be expected in the HVAC system by upgrading equipment on-board, changing system operational parameters and installing customized software to better manage operation of HVAC machinery. As a consequence, the payback period is expected to be less than 6 months. An “Energy Saving Calculation” program can give daily reports to the operators and technical staff ashore regarding the saving. Many of these upgrades have already been installed on-board several Carnival ships and are performing as predicted and specified. The new generation of the “Time Schedule” and “Energy Saving Calculation” system can be interfaced to most existing HVAC HMI control systems and is therefore applicable to most vessels, without exchanging the HVAC HMI. Further improvement of the energy efficiency for the HVAC system is in progress and can now be implemented, which will include chilled water flow control, “Freecooling” of chilled water for ships sailing with low outside temperature, Unoccupied Cabin Control, improvement of Return Air and Enthalpy Wheels as well as demand air flow in Galleys.
KNUD E. HANSEN and Novenco Marine & Offshore A/S in Denmark will manage the upgrades in cooperation with the local KNUD E. HANSEN office in Fort Lauderdale, FL, USA. Technical support, regulatory compliance, refit design, and energy optimization incl. CFD analyses are among the services provided to cruise ship owners since the Florida office opened in late 2010. As a consequence of this focus and the in house knowledge on HVAC, the Company has together with Novenco A/S secured the above contract.