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对提出的利用LNG冷能与低温太阳能的新型联合动力循环系统进行参数优化分析和分析,选取R143a为循环工质,研究了循环蒸发温度、透平进口温度、冷凝温度和LNG汽化压力对循环系统效率、效率和单位做功的换热面积的影响.结果表明:循环系统效率和效率随蒸发温度的升高均先升高后降低,随透平进口温度和LNG汽化压力的升高而升高;冷凝温度越高,循环系统效率和效率越低;单位做功的换热面积随各变量的变化趋势与循环系统效率和效率随各变量的变化趋势相反;当蒸发温度为298.15K、透平进口温度为353.15K、冷凝温度为213.15K和LNG汽化压力为3 MPa时,循环性能最优,在该工况下进行分析发现,换热器损占总损的80%,而泵的损最小.
The proposed optimization analysis and analysis of the new combined power cycle system using LNG cold energy and low temperature solar energy, select R143a as the circulating working fluid, the cycle evaporation temperature, turbine inlet temperature, condensation temperature and LNG vaporization pressure on the cycle System efficiency, efficiency and unit heat transfer area.The results show that the efficiency and efficiency of the circulating system both increase and then decrease with the increase of evaporation temperature, and increase with the increase of turbine inlet temperature and LNG vaporization pressure ; The higher the condensing temperature, the lower the efficiency of the circulation system and the lower the efficiency; the change trend of heat transfer area per unit of work with each variable and the trend of the efficiency and efficiency of the circulatory system with each variable reverse; when the evaporation temperature is 298.15K, Under the conditions of flat inlet temperature of 353.15K, condensing temperature of 213.15K and LNG vaporization pressure of 3 MPa, the cycle performance is the best. Under the operating conditions, it is found that the heat exchanger accounts for 80% of the total loss Pump’s minimum loss.