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, and the data logged. This will allow not only better understanding of how well the engine is working but also allow plots to be produced of pressure variations throughout the cycle and temperature profile across the regenerator. Comparing these results with expected results and other published results it will be possible to see where future improvements need to be made in areas such as high flow restriction (pressure drop) and excessive heat conduction.

The heat source for the engine during testing will be hot water, the source of which is a large water resistor located in the Dept. of Electrical and Computer Engineering’s High Voltage Laboratory. This has a large reservoir which can be heated to the required temperature prior to and during testing, such that a continuous supply of hot water is available. The water will be circulated via a pump through the hot side heat exchanger and back into the reservoir. The cooling water is just cold water which can come from any suitable source, the most likely being simply a cold tap for a sink. It would be useful to observe the entry and exit temperatures of both water sources to help confirm how effective the heat exchangers are.

Starting the engine will be achieved by driving the generator as a motor. This is connected to the crankshaft so that it will turn the piston. If the control system is turned on then it will start to operate the displacer as soon as the crankshaft rotates past a trigger point. The generator can be driven by a three phase variable speed drive to start it from low speed. Because it is geared down by a 6:1, and is rated at 1 kW, it should have ample torque to turn the crankshaft.

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *