A simple one dimensional numerical method is presented for the evaluation of the steady state behaviour of a two phase natural circulation loop. This method is applicable for loop consisting of two vertical limbs connected by point heat source and sink. In this work, Thermo-physical properties are considered as per the loop fluid state. The influence of following parameters such as heat input, inlet subcooling at heat source, loop diameter and height on the loop performance is analysed. Results show that mass flow rate increases with heat input. However, with the increase in heat input, mass flow rate increases initially up to a peak value and thereafter decreases. Also, the increase of loop diameter increases the mass flow rate for all heat inputs. However, increase of loop height has peculiar effect.
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Point heat source, Two phase mixture, Quality, Flashing.