Performance of 300 W class low temperature difference Stirling engine


When it is manufactured from until the present time, a various improvement is donated by 300 W class low temperature degree difference Stirling engine, and an experiment is continued at present. Concerning these experiments, we may introduce the method or a portion of the engine performance to be obtained.

Experimental device and method

A performance test of an engine is done as follows generally. In high-temperature heat-source that is supplied an engine with, the ethylene glycole heated for a stationary temperature in constant temperature water bath is used, and water is used for low heat-source. And it is adopted a way that both heat-source circulate between engine inside and constant temperature water bath by pump. These amount of flow are adjusted by flow control valve to stasionary. Also, gas temperature and heat-source temperature are measured by K type thermo couple arranged each point of engine, and dysplaied and recorded by the hybrid recorder. The pressure in engine is measured by the pressure transducer installed on a cooling wall of the low temperature space side and by Differential Pressure Gauge installed between compression space and expansion space. Output power is calculated by shaft torque, mesured by braking output shaft, and engine speed. A buffer pressure introduces to buffer space by a compressor and adjusts it suitably by pressure control valve.

1 Test Engine 2 Air Compressor 3 Pressure Control Valve
4 Constant Temperature Water Bath 5Heater for Heat Source 6Flow Control Valve
7Pomp for Heat Source 8Water Bath 9Flow Control Valve
10Pomp for Coolant Water 11Spring Balancer 12Pressure Transducer of Cold End
13Differential Pressure Gauge 14Strain Amplifier 15Hybrid Recorder
16A/D Converter 17Personal Computer 18Central Control Panel

Experimental data

We introduce the example performance of the 300 W class low temperature difference Stirling engine.

Experimental Conditions
Heat Source:
Fluid Material Ethren Glycol
Temperature 130 degree Celsius
Flow Volume 20 l/min
Heat Sink:
Fluid Material Water
Temperature 15 degree Celsius
Flow Volume 20 l/min

Temperatures of the engine running (right) and engine power (Left) under atomsferic of buffer pressure.

Structure of 300 W class low temperature difference Stirling engine

300 W class low temperature difference Stirling engine

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