Effect of V-Shape Twisted Jaw Turbulators on Thermal Performance of Tube heat exchanger: An Experimental Study

Abstract

The main purpose of the present investigation is enhancing heat transfer rate in a tube heat exchanger by using V-shape twisted Jaws. The air is used as a working fluid and pumped through the test section with different values of Reynolds number (6000-19500), while the heat flux has been selected as a constant boundary condition around the tube section. In this study, two type of twisted jaw turbulators are used with two twisted ratio (TR= 2 & 4) as well as, the effect of using different numbers of turbulators (N= 6, 8 and 10) inside test section with equal distances between pieces are studied. The results indicated that, using augmentations with TR=2 gives better heat transfer rate and thermal performance factor comparing with the other case TR=4. The maximum rate of heat transfer is achieved in case of N=10 by an increased 160.29% for TR=2 and 102% for TR=4 comparing with plain tube case. In addition, results show that the values of thermal performance factor exceed the unity and shows uptrend behavior with rising numbers of turbulators indicating to feasibility of using these turbulators practically.

Diurnal Analysis of the Performance of Photovoltaic Systems under the Guinea Savannah Atmosphere in Ogoja, Cross Rivers State, Nigeria

“…For this reason, steps have been taken to analyze the performance of PV modules diurnally. Utilization of PV module in locations with very high relative humidity will adversely affect its efficiency because the module will not receive the recommended level of radiation for it to function optimally, since water droplets in the atmosphere will obstruct radiation from reaching it [24][25][26][27][28]. Also, operating PV modules in locations with very low relative humidity will enhance the module temperature to rise beyond its maximum operating cell temperature, hence module performance will be hindered [29][30][31][32][33][34][35].…”