Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander
Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander
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DOI：
10.1016/j.applthermaleng.2012.06.054
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发表时间：
2013-03
影响因子：
6.4
通讯作者：
B. Twomey;P. Jacobs;H. Gurgenci
中科院分区：
文献类型：
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作者：
B. Twomey;P. Jacobs;H. Gurgenci
小规模的太阳能热电联产有望从给定的太阳能可用性中获得更大的效益，因为它不会浪费夏季水容量加热后的潜力。本文在一个小型有机朗肯循环（ORC）中对涡旋式膨胀机进行了测试，并用于标定静态膨胀机模型。对涡旋膨胀机模型的验证表明，轴功率在10%范围内，转速在5%范围内，排气温度在6 K范围内，在非常低的压力比下存在一些异常值。这个校准过的模型然后被整合到一个更大的太阳能热电联产系统的动态模型中，该模型是为一些需要更大容量热水的大型住宅单位或小型商业机构设计的。在集热器面积为50 m2的情况下进行了年度模拟，涡旋式膨胀机的最大等熵效率为59%，ORC效率为3.47%。总发电量为1710千瓦时，可用热水平均为2540升/天。系统瞬时最大可产生功率为676 W，通过调节太阳能储能容量，可以将系统产生功率的时间段调整到与需求高峰时段相匹配。
Small-scale solar thermal cogeneration shows promise as an effective way to get increased benefit out of a given solar availability, since it does not waste potential during summer after the water capacity is heated. In this paper a scroll expander is tested in a small organic Rankine cycle (ORC) and used to calibrate a static expander model. Validation of the scroll expander model shows agreement generally within 10% for the shaft power, 5% for the rotational speed and 6 K for the exhaust temperature, with some outliers at very low pressure ratios. This calibrated model is then incorporated into a larger dynamic model of a solar thermal cogeneration system, designed for some larger dwelling unit or small commercial establishment that requires a larger volume of hot water. An annual simulation is conducted using a collector area of 50 m2, and the scroll expander shows a maximum isentropic efficiency of 59% while the ORC efficiency is 3.47%. The total energy produced is 1710 kWh and the hot water available is on average 2540 L/day. The maximum instantaneous power that can be produced by the system is 676 W, and it is possible to shift the time period that the system is producing power to match the peak demand period by adjusting the solar store volume.