ABSTRACT:

Heat pipe is a simple heat transfer device that acts by transferring heat from evaporation section to the condensation section. Besides, the heat pipe mechanism is using the natural convection to absorb heat from evaporator sector and release the heat at the condenser sector which the latent heat of vaporization is utilised with a corresponding small temperature different. In the last four decades many researchers have studied many parameters related to Heat Pipe used in HVAC System. In this paper we have studied type of heat pipe, type of fluid, heat exchanger surface, thermal performance of a heat pipe charged with nanofluids, Thermophysical properties of the heat pipe material and the working fluid, effect of the heat transfer rate on overall thermal conductivity of heat pipe, effect of the Heat Transfer coefficient of heat pipe. We have studied advantages and disadvantages heat pipe exchangers in HVAC systems. The main advantage by using a heat pipe is that large quantities of heat can be transported through a small cross-sectional area over a considerable distance with no additional power input to the system.