The analysis of the differences between the solar thermal conductivity of the common available types of pipes is conducted using a model solar collector. The collector was devised using common materials.
Papadimitratos et al. (2016) investigated the evacuated solar tube collector integrated with PCM. The heat pipe is immersed inside the PCM to effectively transfer the heat to the PCM, storing them with minimum heat loss. This method is used to provide hot water during a high-demand period or at the low intensity of the sun.
This loop heat pipe collector observed the maximum heat transfer of 725 W ( Diallo et al., 2018 ). Thermal resistance is an important parameter to decide the performance of the solar collectors. The thermal resistance of the PHP absorber decreases with an increase in ambient, evaporation temperature, and solar intensity.
Effects of design parameters on thermal output of solar collectors, advantages of micro-heat pipes, effects of nanofluids with heat pipes, effects of combined heat pipes and heat storage, and effects of mass flow rate and different heat pipe design parameters on the electrical performance of the PVT systems are not elaborated.
Heat pipe solar collectors (HPSC) Heat pipes in solar collectors can be operated in any orientation. They are mechanically bonded or integral part of an absorber, receives and transfer absorbed heat to working fluid i.e. air, water or heat transfer fluid which is circulated through the manifold connected to solar collector .
The assumed difference between the tubing materials occurs when the heating of the collector equalizes the temperature within the pipe materials when they are in applied subjected to the intense heat in a solar collector.