| Abstract [eng] |
The goal of this master‘s thesis is to evaluate how wind speed affects vertical rainwater harvesting system and its efficiency. Furthermore, analysis of layout of deposition of wind driven rain’s is carried out. Economics of such system is also evaluated. Experiments with multiple rain inclination angles were carried out to measure the efficiency of vertical rainwater harvesting system. These angles replicated inclination angles that happen in nature when wind is acting upon rain droplets. 4 different angles were tested that simulated 0.3 m/s, 1.0 m/s, 2.2 m/s and 5.8 m/s wind speeds. Results show, that increase in wind speed increases the effectiveness of the system significantly. When minimum wind speed was simulated, percentage of all the water collected was only 41.82%. When the speed of wind was increased to the maximum value, effectiveness of the system reached 90.94%. After conducting all the tests, regression analysis was carried out. Wind’s impact on the tested rainwater harvesting system can be described by logarithmic equation. This equation lets easy prediction of effectiveness of this system in various wind conditions. In order to select the best position for the vertical rainwater harvesting system CFD simulation is also implemented in this projects scope. During this simulation a building with measurements of 10 m x 10 m x 30 m is modelled. After simulation was completed, result show that such systems should only be mounted on the top part of the building as the amount of rainfall on that areas is much greater than of those at the middle or base of the building. According to the information gathered during CFD analysis and experiments, rainwater harvesting system was designed on similarly shaped building. Total systems area is 36 m2. Calculations show that on average system of that size would collect up to 2.06 m3 of rainwater. Water amount collected from 1 m2 of system equals to 57.19 liters. After making some basic economical calculations, conclusion that this system isn‘t economically viable were made. |
