Carnival seeks efficiencies through HVAC upgrades

NOVEMBER 29, 2013 — Denmark's Knud E. Hansen A/S and Novenco Marine & Offshore A/S, have been contracted by Carnival Cruise Line to install state-of-the-art HVAC upgrades on the cruise giant's Victory, Triumph, Conquest and Spirit Class cruise ships.

Knud E. Hansen says that 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. It says that "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 by 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.

By upgrading equipment on-board, changing system operational parameters, and installing customized software to better manage operation of HVAC machinery, up to 25% efficiency gains in the HVAC systems may be expected in the HVAC system,,. As a consequence, the payback period is expected to be less than six 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 onboard several Carnival ships, and are performing as predicted and specified.

The new generation of the "TimeSchedule" 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, "free cooling" 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. HansenA/S and Novenco Marine & Offshore A/S in Denmark will manage the upgrades in co-operation with the local Knud E. Hansen A/S office in Fort Lauderdale, FL.

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