The diploma thesis consists of a market overview and the testing of an existing prototype and two competing sprayers. The comparison between our prototype and other cordless pressure cleaners was based on measured pressure, flow and operating time. We performed measurements of flow rate through the nozzles at different pressures and nozzle diameters, jet forces for different nozzle surfaces and pressures, spray jet widths for different nozzles and nozzle distances from the surface, and pressure losses in the pipe at different pipe lengths. In addition, we measured flows and pressures for different nozzles, operating time and spray jet width on the prototype. We evaluated the measurement results and compared them with calculations. We found that the higher battery capacity means longer operating time. Increasing the flow rate results in an increase in pressure. The flow rate is higher at larger nozzle outlet cross sections at the same pressures. Also the blasting power increases with increasing nozzle outlet area at the same pressures. The jet width depends on the nozzle spraying angle, the pressure and the distance between nozzle orifice and target area. By selecting the nozzle we determine the intended use of the sprayer.
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