“If benchmarking is coupled with HVAC and automation training, ship crew will have a real chance to maintain a low system energy signature over time”
reduces development time and allows the prognosis of operational costs." Carrier Marine & Offshore Systems’ marketing manager Kevin Glover also believes that the use of data and analysis for HVAC systems is a growing trend for cruise ships and ferries. “There is a tremendous desire within the industry to provide sustainable solutions and system data and information are key to achieving that next level of performance,” he said. US-headquartered Carrier uses its
i-Vu control system to monitor and integrate HVAC systems. Mr Glover pointed out the benefits, saying that “it can give early warning regarding maintenance of the HVAC equipment and ensure its operation is at peak performance. This approach keeps the equipment operating at its highest efficiency, minimises downtime, and contributes to extending its life. This in turn helps to control costs and keep passengers comfortable and happy.” He added that data analysis also facilitates other improvements by experimenting with different temperature settings in different areas at different times. “By analysing the changes in the data, we can find optimal settings that provide the right level of comfort, while controlling the operating costs,” Mr Glover commented. i-Vu can determine the right amount of cooling capacity and optimise the loading of chillers to maximise efficiency. In addition it can vary the amount of fresh air being introduced into areas based on the actual occupancy needs at any given time. The system can turn off cooling in unoccupied areas of a ship and start it back up again when areas are again occupied. Carrier’s AdvanTE3C Solutions
www.passengership.info
Center is also critical to the company’s data analysis solutions. This global group of “experts in efficiency and environment” can model a ship and simulate HVAC system designs to determine the most sustainable solution. Mr Glover said this has resulted in “recovering heat where possible, providing cooling where it’s needed, and providing heat where it’s needed, all with the minimum amount of waste and maximum efficiency.” Wilhelmsen Technical Solutions (WTS) has focused on using what it calls Energy Management Technology (EMT) within its designs to reduce energy consumption as much as possible. This has formed the basis of its HVAC upgrades. By applying EMT, the company says it has saved about 30,000 tonnes of fuel used for HVAC systems annually, which has resulted
in 100,000 tonnes less CO2 emissions. Örjan Götmalm, an internal consultant at WTS, said that the company is installing large marine- standard Variable Air Volume (VAV) air control dampers in public spaces on cruise ships to optimise the ventilation system.
He explained that many of the ships on which it has applied its EMT solutions as part of a refit have systems for public spaces that consist of one air handler supplying a number of spaces – a shop, a cafeteria, a bar and a casino, for example. As a result, just one of these spaces will determine the climate in all of those locations, which is not ideal, he suggested. “If you can use a means to control each air stream to each individual space, you can save a lot of energy,” he said. The use of data was key to developing this approach as WTS’ EMT-VAV dampers communicate over a data network through control sensors and transmitters, with the help of proprietary software and hardware. “Various useful data from each device can be logged and conveyed to crew for improved maintenance and ease of remote control,” Mr Götmalm said. “In that way we can save a lot of energy and improve the climate at the same time.” The use of benchmarking to
reduce HVAC costs and save energy is rapidly becoming more common, Magnus Hansson, who is director of engineered solutions for EMEA at WTS said, pointing out that it is difficult for any crew to determine whether an HVAC plant is operating at its
optimum, considering the varying ambient conditions from one week to another. “This is why benchmarking against a validated computer model is so important, especially when the crew is new on a ship,” he said. “If benchmarking is coupled with HVAC and automation training, ship crew will have a real chance to maintain a low system energy signature over time, something that they are genuinely keen to do.”
Finnish company Halton Marine is also using automation to step up HVAC energy efficiency. The company is installing its demand-based ventilation system for galleys, which it has dubbed Marvel – Model-based Automated Regulation of Ventilation Exhaust Level – into two ships being constructed for Aida Cruises by
Halton Marine’s Marvel has automatic sensors that fine-tune ventilation in the galley according to real needs
WTS fits an airhandling unit that is equipped with control equipment for an energy efficient operation
Passenger Ship Technology I 2nd Quarter 2013 I 61
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