氦气球 （Helium Balloons) 与 氢气球 （Hydrogen Balloons) 的区别。。。。脾气火爆的氢气 #botaktong #delonballoons #balloon #气球 #氦气 #氢气 #跟戴博士一起做实验 #化学实验 #知识科普 #氢气球爆炸 #知识前沿派对 | Terence Tong

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A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. The temperature of the helium is -6^∘ C at the compressor inlet and 50^∘ C at the turbine inlet. Assuming isentropic efficiencies of 85 percent for both the turbine and the compressor, determine ( a ) the minimum temperature in the cycle, (b) the coefficient of performance, and ( c ) the mass flow rate of the helium for a refrigeration rate of 25 kW. | Numerade

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