Heat Transfer
Super Yacht Fit with Bespoke Marine Refrigeration System
Chillflow Solutions Ltd has designed and installed a bespoke R449A-based marine refrigeration system for a 65m super yacht, operating on high efficiency BITZER ECOLINE compressors.The oceangoing icebreaker required a highly reliable replacement refrigeration system to serve its onboard cold room, freezer and garbage store.Use of an off-the-shelf replacement pack was ruled out due to space restrictions, and the distance between the pack, cold rooms and condensers. The system also…
Rotax Unveils New Jet Propulsion Engine
BRP Marine Group announced today the release of the largest Rotax jet propulsion engine yet – the Rotax ACE (Advanced Combustion Efficiency) 300. Now available on Scarab jet boat models and Chaparral Vortex models, the Rotax ACE 300 is the most powerful engine in the recreational small jetboat space. In addition, the new engine includes features like a maintenance-free supercharger, closed loop cooling, lateral thrust control, reduced intake noise, improved sound quality and the…
Evans Updates Coolant Label System
Evans Cooling Systems, Inc., producer of a unique line of waterless engine coolants, announces the release of its new labels for its High Performance Coolant, previously known as NPG+C. The coolant is available in gallons, drums and totes, and the improved label better serves the constantly changing demands of the industry. The technology in Evans High Performance Coolant offers improved performance and reliability for all gasoline and light duty diesel engines. With a boiling point of 375°F…
Evans Debuts New Powersports Label
Evans Cooling Systems, Inc., creator of the only waterless engine coolants, announces the release of its new Evans Powersports Coolant labels. Evans Powersports formula was introduced in the fall of 2011, has since experienced sales growth in the Powersports industry. The coolant is available in half gallon containers and the improved label better serves the uniqueness of Evans revolutionary waterless engine coolants. Formulated specifically for Powersports equipment and personal recreational vehicles, Evans advanced technology offers improved performance and reliability for motorcycles, ATV’s, UTV’s, and snowmobiles.
Virtual Towing Tank State-of-the-Art and Future Trends
The use of computers to solve hydrodynamics problems in shipbuilding started in early days of scientific computing – as early as in aerodynamics and aerospace. Due to limited computing resources at that time, potential flow model was used in both aero- and hydrodynamics. However, while simulations based on Euler equations, Reynolds-averaged Navier-Stokes equations (RANSE) and most recently partially resolved Navier-Stokes equations (so-called “large-eddy” – LES – or “detached-eddy” – DES – simulations) have become established tools in aerodynamics…
