B4CV-20-C Parallel key is not included in scope of supply Bevel-helical gear Reduction Box B4

Flender/Flender Gear Units/Bevel-helical gear Reduction Box B4

thick berglass 2.Dryer The size is 3 long by 2.5 wide by 1 highThe wall insulation is about 3 mm thickA 3 by 3-mm wire mesh serves to hold the grain 3.Air system The cross section of the air channel is 0.1 The airow rate is 5 / at pressure of 1 kPaThe fan motor capacity required is about 1 kW 8 Farkas Fig. 1 Control scheme of solar crop dryer. 6.2 Data Acquisition and Control System The scheme of the data acquisition and control system of the solar crop dryer can be seen in Fig. 1. The control program running on the microcomputer checks the data logging and provides the following functions: Evaluation and printout of momentary values Setting of necessary control signals Data saving for future processing The locations of the sensors are shown in Fig. 1. The temperature and radiation sensors are connected directly; the airow rate sensor is indirectly connected to the computer,through signal transformer. The scanning time is 3 , except the measurement of layertemperatures, which is hourly. First, the control system switches off the fan, F1, while taking the real temperatures, and after the measurement, it switches it on again. 6.3 Dryer Control Strategy The strategy of optimal control involves satisfying the drying requirements. The maximal thermal efciency for the whole solar system must be sought, as follows: 1. Quality requirements For barley drying the material temperature cannot rise above permissible value, which was limited as 6 . This critical state may mainly occur inter- mittently at night as result of biological heat development. In such situa-tion use of an air blower is required. The goal of drying is to reach desired nal moisture content of 1% .. 2. Optimal use of total available energy The precondition for starting the drying process is that the solar radiation must exceed given value. On the basis of experience this value has been identiedas 1 MJ/. To stop the drying process the drying rate can be used. Its value was determined Control Aspe