Steady heat transfers through a phase-changing fluid in a solar collector circuit

In this paper we have presented the design and steady-state analysis of a solar thermal system employing a phase-changing fluid as a heat carrier for transporting thermal energy from the collection side to the user side, without the use of an external mechanical device. The connection between the behaviour of the system and the various geometrical parameters which are representative of the system performance is also established. It was found that Freon 11 has all the necessary requisite properties to be a candidate as the working fluid for such a system.