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首页> 外文期刊>Energy Conversion & Management >Determination and evaluation of the operation characteristics for two configurations of combined heat and power systems depending on the heating plant parameters in low-temperature geothermal applications
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Determination and evaluation of the operation characteristics for two configurations of combined heat and power systems depending on the heating plant parameters in low-temperature geothermal applications

机译：确定和评估低温地热应用中取决于供热设备参数的热电联产两种配置的运行特性

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This paper analyzes impact of the required heating plant parameters on the Organic Rankine Cycle (ORC) power plant and the total plant behavior for two connections of CHP systems; they are the parallel plant and CHP integration according to Glewe-plant, Germany. And also, degree of utilizing the geothermal heat source will be discussed, and all CHP systems presented in the literature will be compared under the same conditions. R134a as working fluid in power plant will be employed. Exergy efficiency, net output power of ORC, irreversibility especially with exhausted geothermal water and the total heat exchange areas will be evaluated. From the calculations, it could be concluded that when operating the power plant in the both aforementioned CHP connections, its performances will be destructed at high heating plant parameters. So the compromised values of the low return temperatures and the heat exchange areas will enhance the power production and the performance of the total CHP systems at unchanged heat demand and supply temperature. The supply temperature does not have any effects on the power generation in case of the parallel connection, while the high values of this temperature affect negatively the other integration. The analysis also proved that the increasing heat demand will reduce the ORC productivity, but it will enhance the heat source utilization. The comparison between the CHP plants showed that the parallel connection is more economical and the series connection is energetically more efficient, while the integration according to Glewe-plant does not provide significant optimization. Finally, it could be noticed that the maximal optimized mechanical power in all present CHP configurations is so restricted, where it does not surpass 50% of the maximal power produced by stand-alone ORC plant.
机译：本文分析了供热厂参数对有机朗肯循环（ORC）电厂的影响以及热电联产系统两个连接的总电厂行为。根据德国格列威工厂的说法，它们是并行工厂和CHP集成。并且，还将讨论地热热源的利用程度，并将在相同条件下比较文献中介绍的所有CHP系统。将使用R134a作为发电厂的工作流体。将评估火用效率，ORC的净输出功率，不可逆性（尤其是用地热水耗尽和总热交换面积）。从计算中可以得出结论，当在上述两个CHP连接中运行发电厂时，其性能会在高发电厂参数时受到破坏。因此，低返回温度和热交换面积的折衷值将在不改变热量需求和供应温度的情况下提高整个热电联产系统的发电量和性能。在并联连接的情况下，电源温度对发电没有任何影响，而该温度的高值会对其他积分产生负面影响。分析还证明，不断增加的热量需求将降低ORC生产率，但将提高热源利用率。 CHP工厂之间的比较表明，并联连接更经济，串联连接在能量上更有效，而根据Glewe-plant进行的集成并未提供明显的优化。最后，可以注意到，在所有当前的热电联产配置中，最大优化机械功率受到了限制，在该范围内，它不超过独立ORC工厂产生的最大功率的50％。

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