Abstract:

A low-temperature solar-thermal-electric power generation system，which uses HCFC123 as the working fluid of the organic Rankine cycle（ORC）and compound parabolic concentrator（CPC）as the solar collectors，was analyzed.In order to enhance the stability and continuance of the power output by ORC and decrease the temperature difference between the heat transferring fluid and the organic fluid，a novel design for the system was proposed.The heat transfer and thermodynamic processes were discussed and the mathematical models were built.Based on the authors’local weather condition，the simulation results indicated that the evaporation temperature of organic fluid，times of tilt adjustments and the number of evaporator stages played an important role in the annual output of the system.The optimized system can generate electric about 87.1 kW•h•m^-2 per year when the evaporation temperature was 119℃ with a two-stage evaporator and 6 times annual tilt adjustments.

摘要：

分析了一种以有机朗肯循环（ORC）和复合抛物面集热器（CPC）为主要组成的太阳能低温热发电系统，设计了旨在增强ORC发电的稳定性及减小换热流体与有机工质传热温差的新型系统结构，建立了系统的数学模型，并结合合肥地区的气象数据进行了数值模拟。结果指出有机工质蒸发温度、集热器倾斜角调整方式、蒸发器级数等参数是系统优化的关键因素，当工质蒸发温度为119℃，蒸发器为两级，集热器倾斜角年调整6次时，系统年发电能力为87.1kW•h•m^-2。