Gratingless Air Circ System in Reefer Ships Proves Successful

Monday, September 17, 2001
Computer simulations and tests have been carried out by LauritzenCool and York Marine AB to confirm the suitability to distribute air in refrigerated cargo holds without gratings. The investigated grating-less concept was confirmed successful by full-scale transports of bananas in a regular service over a period of half a year from Central America to Europe. The work has given valuable information in developing formulas and algorithms to design safe systems for grating-less holds in refrigerated ships. The project started in 1994 with laboratory work at ABB Ventilation Products to find criteria for the rate of cooling of bananas on single pallets. Soon, tests moved on to trials to determine the rate of cooling and temperature gradients in several pallets of bananas and citrus. Finally, regular shipments with bananas on pallets on the MV Ivory Dawn were carried out during a period of six months in a service from Central America to Europe. The tests and shipments have given valuable information to determine the criteria for the design and optimisation of systems for grating-less holds for the next generation of refrigerated ships. Two different executions of the system were evaluated - supply of air under the pallets versus supply of air above the pallets by means of high velocity air jets tangent to a flush ceiling. Criteria for volume, speed and pressure of the air, geometrical limitations of the cargo holds and other requirements that all give an as good as in today's conventional refrigerated ships or even better cooling rates and keeping of the temperatures of all types of produce on pallets in refrigerated cargo holds have been determined. In addition, the project has given valuable information in developing the necessary formulas, algorithms and computer simulation programs in order to design a safe system for grating-less holds in refrigerated ships. The group working in the project has also looked at required technical arrangements to load and discharge ships with a grating-less system. To build ships with a grating-less system for distribution of the air in the cargo holds means savings in the investment of the ship on gratings, lower moulded depth of the hull for the same capacity and a higher stability to carry containers on deck. From an operational point of view, it means no costs for replacement of damaged gratings, less cost for cleaning and less cost in disturbances during loading and discharging.
Maritime Reporter July 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

NOIA Applauds Senate Passage of OPENS Act

NOIA President Randall Luthi issued the following statement on the Senate Energy and Natural Resources Committee’s passage of the OPENS Act, which will open new

Google Maps Goes Coastal with Unmanned Boat

A new high-tech unmanned vessel, launched with the help of Google, will use innovative technologies from the boatbuilding and mapping fields to map shorelines and

Bollinger Delivers 14th FRC to USCG

Bollinger Shipyards has delivered the 14th Fast Response Cutter (FRC), Heriberto Hernandez, to the United States Coast Guard (USCG). The 154-foot patrol craft

Shipbuilding

MHI: Notice of Absorption-Type Split Agreements

MHI gives Notice Regarding Conclusion of Absorption-type Split Agreements Relating to Transfer of Ship Construction and Hull Block Manufacture Businesses to Two

Fratelli Neri Orders Damen Tug

One of the largest Italian tug owners, Fratelli Neri S.p.A, ordered its first Damen tug, an ASD 3212, on 21 July 2015.   The vessel will be the first ASD tug

Thai Navy Lobbies for More Submarines

The Royal Thai Navy claims it urgently needs more submarines to compete with other Asian countries.   The assistant commander made the claim aimed at persuading

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Naval Architecture Pod Propulsion Port Authority Ship Repair Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0964 sec (10 req/sec)