Abstract A hybrid renewable energy system for combined heat and power production has been developed and evaluated. The integration is achieved by feeding the heat harvested from sunlight by parabolic trough collectors into the steam cycle of a biomass-fired cogeneration plant. Under the cogeneration mode or power generation mode, the obtained solar heat is exploited to drive the absorption heat pump for providing heat or warm the feedwater into the boiler, saving the extraction steam and contributing to additional power output. The thermodynamic and economic performance of the hybrid system was assessed based on a typical biomass-fired cogeneration plant. The performance of the new design under different operation modes and various solar conditions was also explored. The results indicated that the solar-to-electricity conversion efficiency can reach 19.38% or 16.92% at the design points under different operation modes (cogeneration or power generation); while the biomass consumption and thermal efficiency of the biomass plant are fixed, the cogeneration mode is superior to the power generation mode. Throughout the year, the solar based electricity of 2803.04 MWh can be generated with an annual solar-to-electricity conversion efficiency of 16.16%. Besides, the levelized cost of solar aided electricity is only 0.1306 $/kWh.

中文翻译：

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太阳能辅助生物质热电联产系统的热力学和经济分析

摘要 开发并评估了一种用于热电联产的混合可再生能源系统。这种集成是通过将抛物线槽式收集器从阳光中收集的热量输送到生物质热电厂的蒸汽循环中来实现的。在热电联产模式或发电模式下，利用获得的太阳热能驱动吸收式热泵为锅炉供热或加热给水，从而节省抽汽并有助于额外的电力输出。该混合系统的热力学和经济性能基于典型的生物质热电联产厂进行评估。还探讨了新设计在不同操作模式和各种太阳能条件下的性能。结果表明，在不同运行方式（热电联产或发电）下的设计点，太阳能到电能的转换效率可达到19.38%或16.92%；在生物质电厂的生物质消耗量和热效率固定的情况下，热电联产方式优于发电方式。全年可产生2803.04兆瓦时的太阳能电力，年太阳能转换效率为16.16%。此外，太阳能辅助电力的平准化成本仅为 0.1306 美元/千瓦时。太阳能发电量为2803.04 MWh，年太阳能转换效率为16.16%。此外，太阳能辅助电力的平准化成本仅为 0.1306 美元/千瓦时。太阳能发电量为2803.04 MWh，年太阳能转换效率为16.16%。此外，太阳能辅助电力的平准化成本仅为 0.1306 美元/千瓦时。