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Stand-Alone Solar Organic Rankine Cycle Water Pumping System and Its Economic Viability in Nepal

机译：尼泊尔独立式太阳能有机朗肯循环水泵系统及其经济可行性

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摘要

The current study presents the concept of a stand-alone solar organic Rankine cycle (ORC) water pumping system for rural Nepalese areas. Experimental results for this technology are presented based on a prototype. The economic viability of the system was assessed based on solar radiation data of different Nepalese geographic locations. The mechanical power produced by the solar ORC is coupled with a water pumping system for various applications, such as drinking and irrigation. The thermal efficiency of the system was found to be 8% with an operating temperature of 120 °C. The hot water produced by the unit has a temperature of 40 °C. Economic assessment was done for 1-kW and 5-kW solar ORC water pumping systems. These systems use different types of solar collectors: a parabolic trough collector (PTC) and an evacuated tube collector (ETC). The economic analysis showed that the costs of water are $2.47/m 3 (highest) and $1.86/m 3 (lowest) for the 1-kW system and a 150-m pumping head. In addition, the cost of water is reduced when the size of the system is increased and the pumping head is reduced. The minimum volumes of water pumped are 2190 m 3 and 11,100 m 3 yearly for 1 kW and 5 kW, respectively. The payback period is eight years with a profitability index of 1.6. The system is highly feasible and promising in the context of Nepal.
机译：当前的研究提出了尼泊尔农村地区独立的太阳能有机朗肯循环（ORC）抽水系统的概念。该技术的实验结果是基于原型给出的。根据尼泊尔不同地理位置的太阳辐射数据评估了该系统的经济可行性。太阳能ORC产生的机械动力与抽水系统相结合，可用于各种应用，例如饮用和灌溉。在120°C的工作温度下，系统的热效率为8％。设备产生的热水温度为40°C。对1千瓦和5千瓦太阳能ORC水泵系统进行了经济评估。这些系统使用不同类型的太阳能收集器：抛物线槽收集器（PTC）和真空管收集器（ETC）。经济分析表明，对于1 kW系统和150 m抽水头，水的成本为$ 2.47 / m 3（最高）和$ 1.86 / m 3（最低）。另外，当增加系统尺寸并减小泵压头时，水的成本降低了。 1 kW和5 kW的最小泵水量分别为每年2190 m 3和11,100 m 3。投资回收期为八年，盈利指数为1.6。该系统在尼泊尔的情况下是高度可行的，并且很有希望。

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