Enhancing the Thermal Efficiency of Gas Pressure Reduction Stations (CGS) Heaters Using the Twisted Tapes (Case study: Iran Golestan Qaleh-Jiq Station)

In this study, Twisted Tape has been investigated to increase the heat transfer in the heaters of the pressure reducing station with a capacity of 1,000 m3 per hour (Golestan Qaleh-Jiq Station). The simulation was performed using Computational Fluid Dynamics (CFD). Simulation results were validated with the data collected from the station, and the simulation results were in good agreement with the data collected from the pressure-reducing station of Qaleh-Jiq, and the deviation from the experimental results was ± 0.1%. Then, three twist ratios of 0.5, 0.25, and 0.167 were considered to study its effect. Changes in speed, temperature, and pressure were analyzed. By inserting Twisted Tape into simple pipes, the length of the coil pipe and the energy consumption of the heaters were reduced by an average of 38% and 22%. This study shows that the efficiency of twisted tapes in the tubes with the highest twist ratio of 0.167 can have the highest efficiency and energy savings.