The Effect of Vibration Pulses on the Thermal Performance of Evacuated Tube Heat Pipe Solar Collector

An experimental research has been performed to investigate and elicit a heat pipe evacuated tube solar collector (HPET-SC) that subjected to mechanical vibration. The voltage ranges used to generate vibration frequency are 6, 8, 10 and 12 Volts. For comparison, two HPET-SC’s were built identically. This comparison has been made based on the solar collector effectiveness of in a presence and an absence of the vibration under Iraq’s winter climatic conditions. In this study, a liquid of an Acetone was used as a working fluid inside the heat tube with 0.7 filling ratio. One of the outlet investigation results indicates that heat transfer coefficients of the evaporation and condensation increased with increasing of the vibrational frequencies. Another result, using the controllable vibration system led to increasing the two coefficients of heat transfer, the temperature of hot water and the total collector effectiveness by (25%), (15%), and (20%) respectively throughout the test conditions.