This study investigates the performance and efficiency of closed-loop oxy-hydrogen Brayton power cycles through numerical modelling and simulation. Coupled with storage hydrogen and oxygen produced by a water-electrolysis system, these cycles have the potential to produce flexible electrical power at high thermal efficiency whilst producing zero exhaust gas emissions. The efficiency and power output of the cycles are investigated using a thermodynamic model. A standard Argon Power Cycle (APC) fuelled by hydrogen is explored which yields an efficiency of 19% under typical operating conditions. To improve the performance, the cycle is modified by including an intercooler, reheater and regenerator, which has the potential to increase the efficiency to 64% when operating under the same conditions. In addition, the potential use of helium and air as the working fluid is explored, as well as a methane fuelled cycle. It is found that the hydrogen–helium cycle is more efficient over all pressure ratios but the most expensive to operate.

本研究通过数值建模和模拟来研究闭环氧氢布雷顿动力循环的性能和效率。再加上由水电解系统产生的储存氢气和氧气，这些循环有可能以高热效率产生灵活的电力，同时产生零废气排放。使用热力学模型研究循环的效率和功率输出。探索了以氢气为燃料的标准氩气循环 (APC)，在典型操作条件下可产生 19% 的效率。为了提高性能，该循环进行了修改，包括一个中间冷却器、再热器和再生器，在相同条件下运行时有可能将效率提高到 64%。此外，探索了氦气和空气作为工作流体的潜在用途，以及甲烷燃料循环。发现氢-氦循环在所有压力比下都更有效，但操作成本最高。