Performance Analysis and Optimization of High Capacity Pulse Tube Refrigerator

2010 ◽  
Author(s):  
Amir R. Ghahremani ◽  
F. Roshanghalb ◽  
R. Jahanbakhshi ◽  
M. H. Saidi ◽  
S. Kazemzadeh Hannani
Keyword(s):  
High Capacity ◽  
Cooling Capacity ◽  
Cooling Power ◽  
Operating Parameters ◽  
Geometrical Parameters ◽  
Average Charge ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator ◽  
Aspect Ratios ◽  
Pulse Tube Refrigerators

High capacity pulse tube refrigerator (HCPTR) is a new generation of cryocoolers tailored to provide more than 250 W of cooling power at cryogenic temperatures. The most important characteristics of HCPTR when compared with other types of pulse tube refrigerators are a powerful pressure wave generator, and an accurate design. In this paper the influence of geometrical and operating parameters on the performance of a double inlet pulse tube refrigerator (DIPTR) is studied. The DIPTR is modeled applying the nodal analysis technique, using mass, momentum and energy conservation equations. The model is able to compute instantaneous flow field throughout the system and calculate cooling capacity and COP. The model is validated with the existing experimental data. To perform the optimized mode of operation, the influence of both geometrical and operating parameters on cooling capacity and COP is investigated. The key geometrical parameters considered in this paper are aspect ratios of regenerator and tube section, length ratio of regenerator and tube, and type of screen mesh. The main operating parameters considered are average charge pressure, and position of opening of orifice and bypass. As a result of this optimization a new configuration of HCPTR is proposed. This configuration provides 300 W at 80 K cold end temperature with a frequency of 50 Hz and COP of 0.054.

Numerical Simulation of Heat Pumping in a Pulse Tube Refrigerator

2007 ◽  
Author(s):  
Takao Koshimizu ◽  
Hiromi Kubota ◽  
Yasuyuki Takata ◽  
Takehiro Ito
Keyword(s):  
Numerical Simulation ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator ◽  
Heat Quantity ◽  
The Difference ◽  
Regenerator Material ◽  
Energy Equations ◽  
Pulse Tube Refrigerators ◽  
Heat And Fluid Flow ◽  
Heat Pumping

Numerical simulation of heat and fluid flow in a basic and an orifice pulse tube refrigerator have been performed to visualize heat pumping generated in the regenerator and the pulse tube, and to clarify the difference in heat pumping caused by the phase difference between pressure and displacement of gas. Common components of the regenerator and the pulse tube are used in the basic and the orifice pulse tube refrigerator. The flow in the tube is assumed to be one-dimensional and compressible. As governing equations, the continuity, momentum and energy equations are used in this study. From the temperature and velocity field obtained as a result of the simulation, the relation between the displacement and the temperature change of gas elements is visually clarified, and consequently it is found that the characteristic that the temperatures of gas elements are nearly higher than those of the regenerator material or the pulse-tube wall during compression and lower during expansion is very important for the heat pumping in basic and orifice pulse tube refrigerators. Furthermore, the behavior of heat pumping in the basic and the orifice pulse tube refrigerator is illustrated by analyzing the relation between the displacement of gas elements and heat quantity transferred to the wall from the gas elements, and the difference in heat pumping between the basic and the orifice pulse tube refrigerator is made clear.

scholarly journals Modeling and Miniaturization of the Thermoacoustically Driven IPTR to Encourage Sustainable Energy

2020 ◽  
Author(s):  
Lavari
Keyword(s):  
Numerical Simulation ◽  
Sustainable Energy ◽  
Superconducting Magnets ◽  
Heat Engine ◽  
New Method ◽  
Cooling Power ◽  
Pulse Tube ◽  
Average Pressure ◽  
Pulse Tube Refrigerator ◽  
Moving Parts

The Thermoacoustic Stirling Heat Engine(TASHE) designed by Backhaus, a device without moving parts which operates at a frequency of 85 Hz with an average pressure of 3 MPa that is capable of using sustainable energies, is applied to run an Inertance Pulse Tube Refrigerator(IPTR) with 1 W cooling power at 90 K. The coupling of these devices caused to eliminate all moving parts as well as miniaturizing the refrigerator to use for cooling superconducting magnets for MRI systems. A new method for the design of the IPTR performed by using numerical simulation of REGEN3.3. Moreover, to have a better vision of the overall configuration of IPTR and verify the Results of REGEN3.3, DeltaEC is used as an auxiliary software. Fortunately, both software results matched perfectly, and the performance of the IPTR was acoustically and thermodynamically ideal.

Performance analysis and optimization of high capacity pulse tube refrigerator

Cryogenics ◽  
2011 ◽  
Vol 51 (4) ◽  
pp. 173-179 ◽  
Author(s):  
Amir R. Ghahremani ◽  
M.H. Saidi ◽  
R. Jahanbakhshi ◽  
F. Roshanghalb
Keyword(s):  
Performance Analysis ◽  
High Capacity ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator

Investigation of a Single Stage Four-Valve Pulse Tube Refrigerator for High Cooling Power

2002 ◽  
pp. 327-336 ◽  
Author(s):  
T. Schmauder ◽  
A. Waldauf ◽  
M. Thürk ◽  
R. Wagner ◽  
P. Seidel
Keyword(s):  
Single Stage ◽  
Cooling Power ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator

D09 4K pulse tube refrigerator with higher cooling power at first stage

2001 ◽  
Vol 2001.5 (0) ◽  
pp. 137-140 ◽  
Author(s):  
Shaowei ZHU ◽  
Masafumi NOGAWA ◽  
Shinji KATSURAGAWA ◽  
Masahiro ICHIKAWA ◽  
Tatsuo INOUE
Keyword(s):  
Cooling Power ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator

Effect of Pressure Wave Generator Characteristics on Pulse Tube Cryocooler Performance

2008 ◽  
Author(s):  
A. Jafarian ◽  
M. H. Saidi ◽  
N. Sarikhani ◽  
S. K. Hannani
Keyword(s):  
Pressure Wave ◽  
High Capacity ◽  
Superconducting Devices ◽  
Cooling Power ◽  
Pulse Tube ◽  
Pressure Amplitude ◽  
Linear Temperature ◽  
Effect Of Pressure ◽  
Pulse Tube Cryocooler ◽  
Wave Generator

Recent developments of superconductive industry require cryocoolers with cooling power higher than one Watt in the 70–80 K temperature range. High capacity pulse tube cryocoolers assure the cooling power required for operation of superconducting devices. The purpose of this paper is to investigate the influence of the pressure wave generator on high capacity pulse tube cryocooler performance. In this respect the hydrodynamic and thermal behavior of the cryocooler is explained by applying the mass and energy balance equations to different components of the cryocooler cycle. A linear temperature profile is assumed in the regenerator and nodal analysis technique is employed to simulate the tube section behavior numerically. Employing the proposed model the effect of pressure wave characteristics at the inlet boundary, namely, the Stirling type and G-M type pressure inlet on cryocooler performance are investigated. The influence of Pressure amplitude, frequency and swept volume is studied as well.

scholarly journals Numerical Simulation of Passive Cooling Beam and Its Optimization to Increase the Cooling Power

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1478
Author(s):  
Katarína Kaduchová ◽  
Richard Lenhard
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Mathematical Model ◽  
Significant Influence ◽  
Cooling Capacity ◽  
Passive Cooling ◽  
Cooling Power ◽  
Geometrical Parameters ◽  
Confined Space ◽  
Cooling Performance

This article is focused on the research of passive cooling beams and increasing their cooling capacity. A passive cooling beam with four tubes was chosen as a model. A mathematical model was built using the corresponding criterion equations to capture the behavior of a passive cooling beam. This mathematical model can be used to optimize geometrical parameters (the distance between the ribs, rib height and thickness, and diameter and number of tubes), by changing these geometric parameters we can increase the cooling performance. The work includes a mathematical model for calculating the boundary layer, which has a significant influence on the cooling performance. The results obtained from the created mathematical model show that the model works correctly and can be used to optimize the cooling performance of passive cooling beams. To better understand the behavior of a passive cooling beam in a confined space, the entire device was numerically simulated, as was the flow in the intercostal space.

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