The compressor operation maps are generated with two different design codes and the operation values of the compressors are interpolated from the compressor maps in the simulation of the entire cooling cycle.
The results show that the compressor blisk has a reliability degree of 0.9984 when the allowable value of the compressor blisk radial deformation is 1.60×10−3 m.
This last parameter and the overall output of the unit pass through a maximum for the same value of the compressor rotation speed.
The values of the effective compressor efficiencies were significantly different, depending on the operation module (cooling load and heat rejection conditions).
The predicted value of collector fluid temperature is used as an input in a companion model that, using the second law, predicts the system coefficient of performance (COP) from the known values of condensing temperature, compressor efficiency and refrigerant properties.
Further, with closed-loop-steam-cooling, the plant efficiency, reaches an optimum value in higher range of compressor pressure ratio as compared to that in film air-cooling.
As soon as the parameters are obtained, a simulation is performed to forecast future values of temperature, pressure and compressor power and therefore, to anticipate the final test results.
The objective of this control, far from being simply to maintain the stack free from oxygen and hydrogen shortages, is to achieve the necessary values of these gases, minimizing compressor consumption, which is the cause of the greatest inefficiency of fuel cells.
A reference value for the air flow of compressor was acquired by the optimal OER regulator, and then the compressor's air flow was adjusted by the fuzzy controller according to the reference value.
