以R134a为工质的OTEC朗肯循环热力计算软件开发

Development of thermodynamic calculation software for OTEC Rankine cycleusing R134a as working fluid

中文关键词: OTEC，朗肯循环，热力计算，软件

英文关键词: OTEC  Rankine cycle  thermodynamic calculation  software

中文摘要:

      以海洋温差热能转换（OTEC）的热力循环为研究对象，为给循环分析提供方便准确的性能计算工具，采用Python程序设计语言，开发了OTEC朗肯循环热力计算软件。软件可以完成简单朗肯循环、再热朗肯循环、抽气回热朗肯循环等3种循环的热力计算，输出结果包括循环最高限制压力、冷凝压力、工质泵功、膨胀机功、蒸发器热负荷、冷凝器热负荷、循环净功以及循环热效率等朗肯循环性能参数。工质热力性质采用R134a的最新国际标准关联式，计算结果足够精确，在蒸发温度24.34℃、冷凝温度8.14℃，泵效率和透平效率均为1.0的工况下，与采用NIST提供的热物性数据进行循环计算结果对比表明，二者完全一致，循环热效率均为5.15%。软件可作为OTEC发电装置的热工设计参考，也可用于R134a工质的 -103.15℃~426.85℃之间的亚临界朗肯循环、跨临界朗肯循环和超临界循环等领域的应用，软件的成功开发对我国OTEC发电应用领域的发展具有相当程度的技术保障与引领作用。

英文摘要:

      Taking the thermodynamic cycle of ocean thermal energy conversion (OTEC) as the research object, in order to provide a convenient and accurate performance calculation tool for cyclic analysis, the thermodynamic calculation software of OTEC Rankine cycle is developed by using Python programming language. The software can complete the thermodynamic calculation of 3 cycles, including simple Rankine cycle, reheat Rankine cycle, regenerative Rankine cycle. The output results of the software include cycle maximum limiting pressure, condensing pressure, working fluid pump work, expander work, evaporator heat load, condenser heat load, net work of cycle and thermal efficiency of cycle. An international standard formulation for the thermodynamic properties of 1,1,1,2-tetrafluoroethane (HFC-134a) is used for calculating the thermodynamic properties of the circulating working fluid. The calculation results are accurate enough. When the evaporation temperature and condensation temperature are assumed to be 24.34℃ and 8.14℃, respectively, and the pump efficiency and turbine efficiency are assumed to be 1.0, respectively, the cycle calculation results show that the thermal efficiency of cycle is 5.15%, which is completely consistent with the calculation result based on the thermal physical property data from NIST. The software can be used as a reference for thermal design of OTEC power plant, and can also be used in subcritical Rankine cycle, transcritical Rankine cycle and supercritical cycle of R134a working fluid between - 103.15 ℃ and 426.85 ℃. The successful development of the software has a certain degree of technical support and leading role in the development of China"s OTEC power generation application field.