“Heat Transfer Performance of Underground U-Type Heat Exchanger: A CFD Model-Based Analysis”, Int. J. Mech. Eng. Res. Tech., vol. 6, no. 2, pp. 1–11, Apr. 2014, Accessed: Oct. 13, 2026. [Online]. Available: https://ijmert.com/index.php/ijmert/article/view/26