The second part of the simulation model consisted of a fuel cell hybrid APU, which was coupled to the TRU thermal model. From our simulations over typical duty cycles it was observed that fuel cell hybrid system offers great potential to improve energy efficiency. The fuel cell hybrid system performance was found to be dependent on component size and control strategy, and we have made a study of the important parameters, such as state of battery charge, fuel cell size, and storage capacity. A fuel cell system enables a new paradigm in TRU design, since an electrical powered system allows for the use of variable rpm electrical drives such as dc motors and scroll compressors. The introduction of these more efficient and flexible systems may allow for better temperature and refrigeration control in future systems.The refrigerant suction pressure, cooling capacity and power requirement of the vapor compression system are stored in tables indexed by ambient and inside air temperatures, compressor operating speeds (high and low rpm) and number of cylinders. Spline interpolation is used to ... simulates the power. Figure 3-9 Block Diagram of Vapor Compression system Figure 3-10 Engine Model Block Diagram.
|Title||:||Modeling and the Performance Analysis of Transportation Refrigeration Units with Alternate Power Systems|
|Author||:||Chintamani Vasant Kulkarni|
|Publisher||:||ProQuest - 2007|