Assuming the rotational speed of nbsp
The proposed converter was thus constructed as shown in Fig. 20 considering the design parameters given in Table 4. It was attempted to choose the converter dimensions as close as possible to the simulation study. The displacer cylinder was made of 40 mm thick wooden frame because the working temperature of the converter was lower than 393 K and the wooden frame could safely withstand this BMS-708163 temperature. Besides, the wooden cylinder possessed a small conductive heat transfer coefficient compared to metallic one that was a desired characteristic to prevent heat transfer from the hot absorber plate to the cold plate. The displacer cylinder was made of a light substance such as Unolit. Accordingly, a thermal isolator was used on top of the displacer piston to prevent damage due to the absorber heat. The clearance between the displacer piston and displacer cylinder was 10 mm. The cylinder of liquid power piston (pumping chamber) was constructed from Teflon bar. It was further connected to the wooden displacer cylinder through a steel pipe with appropriate connectors. The exchanger plates were made of aluminum plates with thickness of 5 mm to provide sufficient strength against maximum pressure inside the displacer cylinder. Connecting rod and the rest of links were constructed from aluminum. Crankshaft and crank were machined from a steel bar. The crank shaft was supported by two ball bearings. It was coupled with DC geared motor from one side and it was attached to the crank of the displacer piston on the other side. The crank mechanism was statically balanced by a 0.34 kg counter weight to significantly reduce the power required for the DC motor. The nominal operating voltage and speed of the DC motor was 12 V and 150 rpm respectively. Finally, the reflector was made of aluminum foil so as to increase solar radiation intensity over the collector area and it was added to the single glazed flat collector.