RT Journal Article
ID 7fa67bc43d8b0cfc
A1 Hemmasian Kashani, Mohammad Mehdi
A1 Dobrego, K. V.
T1 EFFECT OF INLET WINDOWS DEFLECTORS AND WINDBREAK WALLS HEIGHT ON THE PERFORMANCE OF NATURAL DRAFT COOLING TOWER UNDER CROSSWIND CONDITIONS
JF Heat Transfer Research
JO HTR
YR 2016
FD 2016-07-13
VO 47
IS 7
SP 669
OP 680
K1 cooling tower
K1 inlet windows deflectors
K1 crosswind
K1 numerical simulation
K1 cooling tower design
AB The environmental crosswind brings changes in the aerodynamic pattern inside and outside a cooling tower, destroys uniform flow, and may deteriorate the fill zone performance. The effect of inlet windows deflectors and windbreak walls on the performance of a natural draft cooling tower is studied by means of three-dimensional numerical modeling. An assumption of heat and mass transfer equivalence is adopted. The numerical model is tested and verified by experimental data. Nonlinear behavior of the functional dependence of performance on the crosswind velocity is demonstrated by the minimal (critical) wind velocity U_{cr} ~ 6.5 m/s. Utilization of the inlet window deflectors and windbreak walls do not change the value of the critical wind velocity, but may improve the performance of a natural draft cooling tower under moderate and strong wind conditions. Utilization of deflectors in the inlet windows increases the thermal efficiency of a cooling tower up to 8.6% at U > 2 m/s and has no effect at wind velocities close to U_{cr}. Utilization of windbreak walls of optimum height may increase the cooling tower efficiency up to 20−30%. It is demonstrated that the parameters of the vertical wind distribution influence the value of the critical wind velocity. The results of the work may be useful for optimal design of natural draft and "hybrid" cooling towers.
PB Begell House
LK http://dl.begellhouse.com/journals/46784ef93dddff27,5e72dd4008848039,7fa67bc43d8b0cfc.html