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Архивы рубрики: Stirling Engines for Low-Temperature Solar-Thermal Electric Power Generation

Displacer Piston

The only anticipated sources of dissipation in the displacer piston are the friction between the linear motion ball bearing and the shaft, and minor eddy losses in the perma­nent magnets and the iron powder rings. A ring-down test, among others, is an appropriate way for estimating the power dissipation of this system. The system is

Electromagnetic Circuits

The electromagnetic performance of the displacer piston actuator and the power pis­ton generator is characterized by the finite-element method (FEM) and numerical analysis. COMSOL is the FEM engine which is used to determine magnetic flux density data. A two dimensional axial-symmetric model is considered for both pistons, which assumes ring mag­nets for the magnetic poles.

Power Piston

Since this engine is designed to have the potential of being expanded into a multiphase system, the power piston dimensions (diameter, length, and stroke) are made identical to those of the displacer dimensions. By enforcing such an arrangement, one can easily remove the tubing and convert this system into an alpha-type Stirling engine that is

Heat Exchangers

Heater and cooler geometry, in this design, is based on a fin-tube structure that is fabri­cated by press-fitting tubes through stacks of etched metal fins, Figure 4.7. With hydraulic diameter of about 0. 5 mm, the design is optimized for lower frequencies with pumping power in the range of 0.2-0.8 W for the heater and

Displacer Subsystem

The displacer is designed as a reciprocating piston that moves along a shaft with stroke of 15 cm. It is in contact with hot gas (as high as 200 °C) at one end and cold gas (about 30 °C) at the other as shown in Figure 4.4. Thus, in addition to enduring the higher temperature,

Design and Thermodynamic Simulation

Figure 4.1 illustrates the complete assembly drawing and the components of the con­ceived single-phase free-piston Stirling engine design and Figure 4.2 depicts the simplified schematic diagram of the engine representing the pistons and heat exchanger configuration of the system. The gas circuit of the displacer subsystem is closed by means of tubing in order to

Single-Phase Stirling Engine Prototype

Design, fabrication and test results of a gamma-type free-piston Stirling engine are discussed in this chapter. The design of a very low-loss resonant displacer piston, the heat exchangers, and the power piston, as the key components, is elaborated. This prototype is a low-power engine that utilizes ambient pressure air as its working fluid. It is

Conclusions

In this chapter, the most significant non-ideal phenomena that can degrade the perfor­mance of a Stirling engines were highlighted and discussed. Fluid flow dissipation at heat exchangers, temperature drop at heater and cooler, the regenerator ineffectiveness, gas spring hysteresis loss, clearance seal leakage, and direct conduction were among parasitic losses that were presented. In each

Conduction Loss

Conduction is another loss mechanism that will be discussed in this chapter. Since Stirling engines incorporate a hot side (heater and expansion space) and a cold side (cooler And compression space), there are chances of direct conductive heat flow from the hot side to the cold side that should be identified and minimized. As a

Clearance Seal Leakage

For reciprocating pistons of a Stirling engine, a clearance seal is a good alternative to conventional ring type seals. A clearance seal obviates rubbing surfaces and lubrication requirements. Obviously, due to the inherent clearance, this type of seal will leak to some degree. Therefore, thermodynamic effects of this leakage are important to the design. Clearance