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Efficient Heat Transfer Solution

 

Thermal Management:  Ship System-Level Thermal Models and Simulations

The objective of the project is to develope thermal models, thermal subsystems and incorporate them into dynamic simulation of ship electrical power systems for system-level ship thermal management. For the Navy’s future all-electric ships, thermal issues become more important due to the fact that the increasing amount of advanced power electronics, high power sensors, etc, will result in large amount of additional heat load. To evaluate the impact of the transient load expected to be experienced on both the ship’s electrical systems and thermal systems, it will be necessary to better co-design the electrical and thermal systems, in particular to account for transient responses during dynamic events due to thermo-electrical system interactions. Such a simulation approach will permit ship designers to address thermal issues earlier in the design process to produce more efficient, less costly ship power systems.

Many thermal models for dynamic simulation have been developed for this project. Major components, such asVTB several types of heat exchangers, heat sinks, condenser, evaporator, radiators, expansion valve, temperature controller, pressure regulators, mixing chamber, etc, were added into the VTB component library. Most of them are based on the principals of heat transfer, thermodynamics and fluid mechanisms. By integrating those components, dynamic simulations for several most essential cooling schemes of ship’s cooling system were implemented successfully. Those demo simulations include the fresh water cooling subsystem and the chilled water cooling subsystem on board of the notional DDG-51 class destroyer.

We also have demonstrated the capability of thermo-electrical coupled co-simulation between a power generation subsystem and a zonal thermal subsystem. This is implemented by integrate the fresh water cooling model with the existing Solid Oxide Fuel Cell / Gas Turbine hybrid power generation model. By using the co-simulation methodology, the impacts of the ship’s load change on the dynamic performance of the each subsystem, i.e., Solid Oxide Fuel Cell, Gas Turbine, propulsion plant and thermal plant were evaluated. Right now, a more detailed gas turbine model is under developing which will employ the whole performance maps of the compressors and power turbines.

Related Publications

1.     Ruixian Fang, Wei Jiang, Jamil Khan, Roger Dougal, “Thermal Modeling and Simulation of the Chilled Water System for Future All Electric Ship”, IEEE Electric Ship Technologies Symposium, Alexandria, VA, April 10-13, 2011.

2.     Ruixian Fang, Wei Jiang, Jamil Khan, Roger Dougal, “Thermal System Modeling and Co-Simulation with All-Electric Ship Hybrid Power System”. Journal of Energy Resources Technology, under review, Aug. 2010.

3.     Ruixian Fang, Wei Jiang, Jamil Khan, Roger Dougal, “System-Level Thermo Modeling and Co-simulation with Hybrid Power System for Future All Electric Ship”, 2009 IEEE Electric Ship Technologies Symposium, pp.547-553, Baltimore, April 2009.

4.     Ruixian Fang, Wei Jiang, Jamil Khan, “System-Level Dynamic Thermal Modeling and Simulation for an All-Electric Ship Cooling System in VTB”. 2007 IEEE Electric Ship Technologies Symposium, pp462-469, Arlington, VA, May 2007.

5.   Wei Jiang, Jamil Khan, Roger A. Dougal “Dynamic Centrifugal Compressor Model for System Simulation”. Journal of Power Sources , Volume 158, Issue 2 , 25 August 2006, Pages 1333- 1343.

6.   Wei Jiang, Ruixian Fang, Roger A. Dougal, Jamil Khan, “Dynamic Electro-thermal Simulation of a Tubular Solid Oxide Fuel (SOFC)”. 2006 ASME International Mechanical Engineering Congress & Exposition (IMECE), IMECE2006-16279 , Nov., 2006.

7.   Wei Jiang, Ruixian Fang, Roger A. Dougal, Jamil Khan, “Parameter Setting and Analysis of a Dynamic Tubular SOFC Model”. Journal of Power Sources, Volume 162, Issue 1 , 8 November 2006, Pages 316-326.

8.   Wei Jiang, Ruixian Fang, Roger A. Dougal, Jamil Khan, “Thermo-electric Model of a Tubular SOFC for Dynamic simulation”. ASME, Journal of Energy Resources Technology, accepted in Jan. 2007.

for more information: fangr@email.sc.edu

Funded by : ESRDC