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An iterative algorithm for simulating heat recovery from exhaust gas - Application on generators

机译：模拟废气中热量回收的迭代算法-在发电机上的应用

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This paper presents a parametric study that evaluates the heat that can be recovered from the gases resulting from the combustion of fuel in the power generators. This heat is evaluated by using a heat exchanger between the exhaust gases and another stream which is water. A geometrical configuration of the heat exchanger is considered and modeled; it considers that the water is flowing in the annulus while the gases are flowing through the inner tube in an opposite direction of a concentric tube type.The appropriate thermal model and procedure are presented and applied to a 15 kVA power generator. Different cases are studied. In each case, the temperature of water leaving the heat exchanger is calculated for several water flow rates. It was shown that the temperature of water can reach 50.5 degrees C depending on the mass flow rate and the water inlet temperature. The corresponding recovered average heat rate is 4.3 kW. This recovered average heat rate increases to 7.7 kW when the mass flow rate of water increases from 0.05 kg/s to 0.5 kg/s.Besides, the impact of the size of the power generator on the temperature of water leaving the heat exchanger and the recovered heat has been studied. Four different power generators are compared (15 kVA, 30 kVA, 60 kVA and 180 kVA). It was shown that, when the water inlet temperature and the water mass flow rate are equal to 10 degrees C and 0.4 kg/s, respectively, the temperature of water increases from 14.6 degrees C for a 15 kVA power generator to 39.4 degrees C for a 180 kVA power generator. The corresponding recovered average heat rate increases from 7.7 kW to 49.15 kW. (C) 2018 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
机译：本文提出了一项参数化研究，评估可以从发电机中燃料燃烧产生的气体中回收的热量。通过在废气和另一股水流之间使用热交换器评估热量。考虑并建模了热交换器的几何结构；它认为水在环形空间中流动，而气体在同心管类型的相反方向上流经内管。提出了适当的热模型和过程并将其应用于15 kVA发电机。研究了不同的情况。在每种情况下，都针对几种水流量计算离开热交换器的水的温度。结果表明，取决于质量流量和进水温度，水温可以达到50.5摄氏度。相应的回收平均热效率为4.3 kW。当水的质量流量从0.05 kg / s增加到0.5 kg / s时，回收的平均热量增加到7.7 kW。此外，发电机尺寸对离开热交换器和水的水温的影响已经研究了回收的热量。比较了四种不同的发电机（15 kVA，30 kVA，60 kVA和180 kVA）。结果表明，当进水温度和水质量流量分别等于10摄氏度和0.4千克/秒时，水温从15 kVA发电机的14.6摄氏度增加到15 kVA发电机的39.4摄氏度。 180 kVA的发电机。相应的回收平均热量从7.7 kW增加到49.15 kW。 （C）2018国际模拟数学与计算机协会（IMACS）。由Elsevier B.V.发布。保留所有权利。

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