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Двигатели Стирлинга

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Двигатели Стирлинга

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Двигатели Стирлинга

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Архивы рубрики: A LOW TEMPERATURE DIFFERENTIAL STIRLING ENGINE FOR POWER GENERATION

Displacer Control Program

98: — 0 O O 91: W0 94: § CTl O O 97: 00 101: 0 5 + 105 O0 109 W0 112 A0 114 L 112 1 118 R 1333 122 W10 125 G 0 1 130 W0 133 A8 135 L133 1 139 R 0 143 W10 146 G 0 1 Rotate CCW

Thermal Constants

Table of Thermal Conduction Values for Common Substances Substance K ( W/m. K) Air 0.024 Aluminium 237 Antimony 18.5 Beryllium 218 Brass 110 Cadmium 92 Cobalt 69 Constantan 22 Copper 398 Gold 315 Iridium 147 Cast Iron 55 Pure Iron 80.3 Wr’t Iron 59 Lead 35.2 Magnesium 156 Molybdenum 138 Monel 26 Nickel 90.5 Platinum

Engine Specifications

A1: General Engine Specifications Total volume of displacer chamber: Cylinder diameter: Piston stroke: Mean engine pressure: Working gas type: Total working gas volume: Dead volume: Volume ratio: Operating RPM: Heater design temperature: Cooler design temperature: 0.402 m3 (797 ID x 806 length) 228.3 mm 50 — 150 mm (adjustable) 1.0 MPa Air, nitrogen or helium

Commercialisation Options

The key feature of this engine design that would make it attractive to potential buyers is its ability to run on a variety of low grade heat sources that are potentially free, however for it to be successful in the marketplace it must be very cost competitive as an outright purchase. If a small version

Numerical Modelling

It was originally intended to optimise the design parameters using a computer software package called SAGE™. This software allows the user to input a configuration of Stirling engine components such as variable volume spaces, heat inputs, conduction paths, pressure sources and pistons and displacers, and then assign numerical values to certain geometries and temperatures as

Testing Procedures

If the engine was completed then thorough testing would have taken place. Because the engine is designed to run on a range of temperature differences with adjustments in stroke and phase angle possible it would have been a laborious and exhaustive process to test every conceivable combination of temperature difference, stroke and phase. To adjust

Engine Operation

Upon eventual completion of the construction of the engine, a number of things must be done in order to run and test it. Several pressure transducers and temperature thermocouples shall be placed at strategic points throughout the engine, allowing the pressure and temperature at the locations to be monitored in real time via a computer,

Discussion and Conclusions Engine Design Review

Unfortunately, at this time the construction of the engine has not been completed due to the author having a tight deadline and unforeseen delays in the fabrication of the engine and as a result of this it is not possible to comment on its performance. At this stage all of the outer casing and wheeled

Motor Power

In order to gain an understanding of how much power the stepper motors consume during normal operation, some measurements of current and voltage were taken under both steady — state and peak operation of the motor. Figure 88 shows the voltage and current waveforms under steady-state operation, with no load on the motor. It shows

Motor Current

Measurement of motor current waveforms under various conditions was carried out to confirm current draw and current waveform shape. The graph in Figure 83 shows current in each of the motor phases under steady state rotation. The phases are 90° apart from each other and equal in magnitude. RMS current under this condition is approximately