The hot end of regenerator and pulse tube hot end inflation

The average lowest temperature, the pressure to get back to the hot end of the heater and the pulse tube hot end measurement and pressure amplitude change with the mesh. The figure shows the change of the average pressure of the ends of the regenerator with the mesh number. Regenerator hot end of the pressure amplitude, and the increase in compression ratio with the mesh number increases, the amplitude of the vasculature side pressure and pressure ratio at 295 mesh. Hot side of the recuperator pressure amplitude and vasculature of the hot end of the pressure amplitude of the difference is increased with the increase in the number of stainless steel wire mesh, to illustrate the pressure drop in the regenerator increases with the increase in the number of the mesh, and Figure 5.26 The calculation results are consistent. 5.30 and 5.31 compare different stainless steel mesh and inflatable pressure cooling capacity and COP. 247,295 and 397 mesh lowest temperature of three different screen-refrigerator were 12.2,11.1 and 11.3 K in the 20K a maximum cooling capacity were 15.7,17.8 and 16.7W, input power of 6.7kW. The same inflation pressure, the the different mesh cooling capacity curve substantially parallel to the screen mesh change did not change the vascular cooling mechanism; refrigerator in stainless steel mesh screen 295 when the best performance. Deviation from this result with Figure 5.28 regenerator performance factor calculation results. But Figure 5.29 shows that, when the stainless steel mesh is increased from 247 to 295, although the both ends of the recuperator pressure amplitude difference becomes large, but the side of the pressure amplitude of the vasculature while increasing, and continue to increase the number of mesh to 397 when vasculature side of the pressure began to increase becomes smaller. Because of the small pressure drop within the vasculature, and can be considered that the measured pressure of the pulse tube hot end is the refrigerator cold end of the pressure. The performance of the pulse tube refrigerator with the the refrigerator cold side pressure wave pressure ratio increases. Therefore, we can think: Moderate increase of stainless steel wire mesh to about 300, that is, strengthening the capacity of the heat exchanger of the regenerator, although it will increase the pressure drop, but still can improve the performance of the pulse tube refrigerator; continue to increase the wire the mesh of the network will be significantly increases the pressure drop and resistance loss in the regenerator, and reducing the performance of the regenerator even rEFRIGERATOR.