The Effect Of Cooling Capacity At Different Air Velocity For A Constant Water Flow Rate

873 WordsSep 27, 20154 Pages
5. Results and discussion 5.1 Cooling tower data Figure 5.1 shows the plot of cooling capacity at different air velocity for a constant water flow rate. Fig. 5.1: Cooling capacity at different air velocity for a constant water flow rate From the graph, it is clear that the cooling capacity increases with increase in the air velocity. Also, at higher water flow rate the cooling capacity is higher. This trend can be attributed to the fact that at higher flow conditions, the convective heat transfer flux is higher resulting in a higher heat transfer rate. The mass transfer is higher as the humid air is removed from the column at a much faster rate owing to the high flow rates; this helps in stripping of water from the liquid phase. Higher mass transfer would result in more energy being gained by air in the form on latent heat. The curve for lowest water flow rate (28.9L/hr) shows the largest slope between the 2nd and 3rd data points. This can be explained by the fact that the slow water flow rate results in a high residence time in the column that provides air sufficient time to strip. Figure 5.2 shows the plot of cooling coefficient at different air velocity for a constant water flow rate. Fig. 5.2: Cooling coefficient at different air velocity for a constant water flow rate From the graph, it is clear that the cooling coefficient increases with increase in the air velocity. The reason behind this phenomenon can be attributed to the fact that at higher air velocity,

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