An intelligent digital flow rate measurement system is presented to replace the conventional hot-wire flow rate measurement system, which uses original analog feedback circuit. In this paper, the conventional Wheatstone bridge measurement circuit is replaced by a new Pulse Width Modulation (PWM) circuit for the purpose of energy conservation. The system employs a PIC18F452 chip to interface a thermal flow measurement system to measure the flow rate. And a signal prediction algorithm is introduced to speed up the measurement. It has been proved that the performance of the intelligent digital flow rate measurement system has been increased compared with conventional flow rate measurement system based on the thermal air flow sensor.
The multi‐stack fuel cell system (MFCS) can be widely used in large E‐power generation scenarios because of its higher output power, efficiency and reliability, and air supply for integration in MFCS. To study the issue of air supply distribution for different stacks, two MFCS air supply systems with different structures are designed. For the air supply system, the pressurized air supply device is the core component, and its performance directly affects the efficiency, structural complexity, cost, and other indicators of the MFCS. According to the characteristics of different types of compressors, air compressors are selected for matching with air supply devices for MFCSs with different topologies. Furthermore, based on the established mathematical models, the pressurized air supply devices suitable for MFCSs are optimized matching from the perspectives of working condition adaptability, electrical power consumption, and maximum electrical power. It is shown in the results that the most energy‐saving scheme is the parallel air supply device for the MFCS matching screw‐type air compressor. Considering the complexity of the system structure and the cost, the best scheme is to match the integrated air supply device for the MFCS with piston‐type air compressors.
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