Performance Enhancement of Vapor Compression Cycle Using Nano Materials THEORETICAL INVESTIGATION OF VAPOR COMPRESSION CYCLE PERFORMANCE USING DIFFERENT NANOMATERIALS ADDITIVES Analytical investigation of energy performance in secondary loops of refrigeration systems using different nano materials additives Performance Enhancement of Vapor Compression Cycle using Nanofluids A 3D MODEL OF THE EFFECT OF USING HEAT SPREADER ON THE PERFORMANCE OF PHOTOVOLTAIC PANEL (PV) 3D study on the performance of cooling technique composed of heat spreader and microchannels for cooling the solar cells A 3d model of the effect of using heat spreader on the performance of photovoltaic panel (PV) Enhancement of vapor compression cycle performance using nanofluids: Experimental results An experimental study of the performance of the solar cell with heat sink cooling system An experimental work on the performance of solar cell cooled by flat heat pipe