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It displaces working fluid (air in our case) between hot and cold surface. It has to be low in weight and low thermal conductivity. Size:: Thermocol: 120 mm diameter, 30 mm thick. Figure 7 displacer As mention above diameter of displacer is 125mm and we have taken radial clearance of 2mm. Putting these values in above equation. Diameter of displacer ≈ diameter of displacer cylinder – 2* radial clearance Diameter of displacer ≈ 125-2* 2 =121mm ≈ 120mm (taken data) We have taken thickness of 30mm which is higher than half of the height of cylinder (25mm). There is equation available for stroke of displacer. Stroke= (height of cylinder- thickness of displacer)- 2* clearance[6] We have to provide some clearance between cold surface and upper surface of displacer and between hot surface and lower surface of displacer. We provided clearance of 5mm. So, stroke=(50−30)−2×5 =10mm. • Now crank radius for displacer, Crank radius = stroke = 5mm.. 2 4.3 Design of Power Piston and Cylinder Power piston is the most important part of engine. It produces power stroke from the expansion of air in power piston. Power piston and cylinder must have very low friction. From empirical relation power piston expansion volume should be around 1/25 times swept volume of displacer cylinder. And stroke of power should be same as displacer stroke (slightly smaller power piston stroke is also permissible). Co-efficient of friction between piston and cylinder should be as low as possible, so proper lubrication is also required to be done. Kinds of materials that satisfy above requirement and can be used are as follows: 1. Steel piston and steel cylinder, 2. Graphite piston and glass cylinder, 3.Epoxy resin piston and glass or steel cylinder, 4. Brass piston and brass cylinder, etc. Stroke of power piston = stroke of displacer Stroke of power piston = 10 mm. . Crank radius = stroke = 5 mm. 2 Power piston expansion volume = swept volume of displacer cylinder 25 swept volu me of displacer cylinder = π × 125 2 × 10 4 =122.72 ×103 mm3 IJAET/Vol.III/ Issue I/January-March, 2012/305-310 Power piston expansion volume = 122.72 ×103 25 = 4908.8mm3 Powerpistonexpansionvolume= π ×(dia.ofcylinder)2 ×stroke 4 Diameter of power piston cylinder = International Journal of Advanced Engineering Technology E-ISSN 0976-3945 4908.8 × 4 π ×10 = 25mm. 4.4 Other parts of the Engine Crankshaft: It converts reciprocating motion into rotary motion and also supports flywheel. Size: SS, 2 mm diameter, 160 mm length.90o phase angle difference. Figure 8 crankshaft Flywheel: it is made up of plastic with 120 mm diameter, 1 mm thickness. Figure 9 flywheel Supports for Crank Shaft: It supports crank shaft between two point bearings Size :: ms, 10 mm diameter, 120 mm height. Figure 10 supports for crankshaft Figure 11 Final assemblyPDF Image | Research Paper WASTE HEAT RECOVERY USING STIRLING ENGINE
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