开式简单布雷顿制冷循环热力学优化 2.性能优化

Thermodynamic Optimization of Open Simple Brayton Refrigeration Cycle:Part 2 Performance Optimization

为对开式简单布雷顿制冷循环的热力学性能进行优化,根据本文第一部分建立的热力学模型,采用数值计算的方法,分别给出了空气制冷循环制冷率分析和优化结果,在输入功率、装置总的流通面积和总的热导率约束条件下制冷系数分析和优化的数值计算结果。研究结果表明,存在最佳的压缩机入口压降使制冷循环时的制冷率最大;当给定循环输入功率和装置总尺寸时,存在压缩机最佳入口压降使制冷循环时的制冷系数(制冷率)最大,存在最佳的高低温侧换热器热导率分配使制冷系数最大;最大制冷系数(制冷率)对压缩机压比有最大值。

To optimize the thermodynamic performance of open simple Bretton refrigeration cycle, according to the thermodynamic model established in Part 1 of this paper, here it adopts numerical calculation method and presents the air cooling circulation cooling rate analysis and optimization results respectively. The refrigeration coefficient is analyzed and numerical calculation results are optimized under the constraint of input power and device total circulation area and thermal conductivity. The results show that the maximum circulation cooling rate can be achieved with the best compressor inlet relative pressure drop value. At the given cycle input power and device size, the maximum circulation cooling coefficient （rate） can be achieved with the best compressor inlet relative pressure drop value, as well as with the best heat transfer rate distribution of high temperatureside heat exchanger. There exists the maximum ratio between maximum refrigeration coefficient （rate） and compressor pressure.