The present article aims to suggest new thermal unit as heat recovery system to augment the available energy. Hot gas flows inside the inner pipe and the operating fluid in annulus region is nanofluid (CuO-water). Helical tape with various revolution number (N) was employed to augment the fluctuations of fluid and reduce the boundary layer thickness. Range of Reynolds number (Re=4000 to 20,000) indicates turbulent regime. To involve such range of Re, K-ɛ approach has been utilized and its validity was reported. Achieving to greater useful energy happens if the irreversibility of system minimized. This function has two terms: frictional term (S_gen,f) and thermal term (S_gen,th). The thermal term is higher than frictional term and it should be considered as main source of irreversibility. With augment of rotational speed as a result of higher values of Re and N, velocity gradient goes up but thinner boundary layer will be generated. So, with rise of such parameters, temperature gradient declines and residence time enhances which results in better mixing of fluid. So, two scrutinized factors have favorite effect on S_gen,th and considering greater values of them leads to lower thermal irreversibility. Also, growth of these factors makes S_gen,f to increase which is unfavorable effect. As N augments from 3 to 5, the value of S_gen,f enhances about 47% but S_gen,th reduces about 42.47% when Re=5000. Also, with selecting higher N from 3 to 7 when Re=2000, frictional entropy augments about 128.95% while S_gen,th reduces by 35.97%. S_gen,th faces 39.14% decrement if Re goes up when N = 3 while with same change, the value of S_gen,f augments to 7.27 times greater value.

本文旨在提出一种新的热力单元作为热量回收系统，以增加可用能量。热气体在内管内部流动，环形区域中的工作流体为纳米流体（CuO-水）。使用具有不同转数（N）的螺旋带来增加流体的波动并减小边界层的厚度。雷诺数范围（Re = 4000至20,000）表示湍流状态。为了涉及这种范围的Re，已使用K-ɛ方法，并报道了其有效性。如果系统的不可逆性降至最低，则会获得更大的有用能量。该函数有两个项：摩擦项（S _gen，f）和热项（S _gen，th）。热项高于摩擦项，应将其视为不可逆的主要来源。由于Re和N值较高而导致转速增加，速度梯度会上升，但会生成更薄的边界层。因此，随着这些参数的增加，温度梯度下降，停留时间增加，从而导致流体更好地混合。因此，两个受审查的因素对S _gen具有最喜欢的影响_，并且考虑到它们的较大值将导致较低的热不可逆性。而且，这些因素的增长使得S _gen，f增加，这是不利的作用。当N从3增加到5时，S _gen，f的值增加约47％，但S _gen，th当Re = 5000时降低约42.47％。同样，当Re = 2000时，从3到7中选择较高的N，摩擦熵增加约128.95％，而S _gen，th减少35.97％。如果在N  = 3时Re升高，则S _gen，th面临39.14％的减少，而在相同变化的情况下，S _gen，f的值增加到7.27倍。