Simultaneous effects of water spray and crosswind on performance of natural draft dry cooling tower

Abstract

To investigate the effect of water spray and crosswind on the effectiveness of the natural draft dry cooling tower (NDDCT), a three-dimensional model has been developed. Efficiency of NDDCT is improved by water spray system at the cooling tower entrance for high ambient temperature condition with and without crosswind. The natural and forced heat convection flow inside and around the NDDCT is simulated numerically by solving the full Navier-Stokes equations in both air and water droplet phases. Comparison of the numerical results with one-dimensional analytical model and the experimental data illustrates a well-predicted heat transfer rate in the cooling tower. Applying water spray system on the cooling tower radiators enhances the cooling tower efficiency at both no wind and windy conditions. For all values of water spraying rate, NDDCTs operate most effectively at the crosswind velocity of 3m/s and as the wind speed continues to rise to more than 3 m/s up to 12 m/s, the tower efficiency will decrease by approximately 18%, based on no-wind condition. The heat transfer rate of radiator at wind velocity 10 m/s is 11.5% lower than that of the no wind condition. This value is 7.5% for water spray rate of 50kg/s

Experimental investigation of evaporation enhancement for water droplet containing solid particles in flaming combustion area

“…According to experimental research results water droplet destruction during its motion in the high-temperature gas area is possible in case of big size of solid particle (about 50-60% of the droplet size). The established features were in good agreement with the basic concepts of the modern theory of gas-vapor-droplet flows at the phase transitions [45][46][47][48][49][50][51][52]. Developed experimental technique can significantly extend the representation of the investigations [45][46][47][48][49][50][51][52].…”

Study of Heat Rejection in Triple Natural Draft Dry Cooling Towers under Crosswind Using Radiator-Type Windbreakers

“…M.Goodarzi [2], posed using of a specific configuration in cooling tower stack to reduce suffocation in outlet plume. Amooie & Goodarzi [5] improved the cooling tower efficiency up to 1.67% by using of heterogeneous distribution in radiators during crosswind.Ahmadikia & Coworkers [6] offered using of water spray in the inlet of cooling tower in crosswind conditions or no-wind conditions to improve cooling tower efficiency. Goodarzi & Keimanesh [7] in a research by using numerical simulation studied two other kinds of windbreakers.…”

Impact of Crosswind on Steady-State and Dynamic Performance of Natural Draft Dry Cooling Tower Group: A Numerical Analysis

“…Goodarzi et al [11] demonstrated that a new geometry for the dry cooling tower improved its thermal performance under windy conditions, regardless of wind direction. Ahmadikia et al [12] suggested that installing a water spray system at the heat exchanger inlet can optimize the cooling performance of the dry cooling tower, with higher water spray rates resulting in better cooling. Liu et al [13] utilized numerical simulations to investigate heat transfer performance enhancement resulting from crosswind effects at the top of a 20 m tall small NDDCT.…”