Conveners
Tue-Po-1.5: Expanders, Pumps, Compressors, Regenerators & other devices
- Xiujuan Xie (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
The MAST-U – Mega-amp Spherical Tokomak – is undergoing enhancements which will position it at the forefront of fusion energy research. The enhancements will allow the reactor to run at elevated temperatures, provide more flexibility with studying plasma physics exhaust and increase our understanding of the underlying physics of tokomaks. It will also be essential to validate models when...
Abstract:
Types of Cryogenic storage vessels may vary from low-performance containers, insulated with rigid foam or fibrous insulation to high-performance containers having multilayer insulation along with high vacuum in the annular space of the double-walled vessel. Thermal insulation is the most vital factor in the design of any cryogenic system to prevent the following possible modes of...
The regenerator is a vital component within the liquid air energy storage system, enabling the transfer of cold energy between the processes of air liquefaction and gasification. Solid-phase cold storage, distinguished by its lack of operating temperature constraints, environmental friendliness, and cost-effectiveness, stands out as a highly promising method for cold storage in liquid air...
In a nuclear fusion experimental device using superconducting magnets, it is necessary to continuously supply liquid helium to the magnets. Therefore, the stable operation of a helium refrigerator is required during the plasma experiments. Turboexpanders, which are core equipment of the helium refrigerator, contain many parameters to be monitored constantly. During the operation of the helium...
A compact submersible centrifugal pump has been developed to transfer liquid helium with flow rates up to 20 liters per minute between dewar vessels against the pressure loss of the transfer line. The pump is equipped with a cold motor and ball bearings. The authors report on the latest test results and performance characteristics.
The performance of a 3-stream plate-fin heat exchanger in a helium refrigerator plant having a modified Claude cycle is crucial to achieve required refrigeration power. This heat exchanger is placed between 2 warmer turbines of the helium refrigerator plant, which is being developed at IPR, Gandhinagar, India. This 3-stream plate-fin heat exchanger has been designed using serrated fins of...
The centrifugal cold compressors are the pressurizing device commonly used in large-capacity superfluid helium systems to connect the 2 K helium tank to the room-temperature screw compressors. In order to provide a large pressure ratio, the cold compressors are connected in the form of multi-stage series, which would result in the stable operating region that is reduced to a certain extent....
Aerostatic bearings, due to their low friction and long lifespan, are widely used in high speed cryogenic turbo expanders. In various refrigeration cycles, it is essential for the bearing gas to be compatible with the working fluid gas to prevent contamination of the whole process. Due to variations in bearing gas viscosity, density and other properties, the static and dynamic characteristics...
The compressibility of the gas is used to produce elastic recovery force, provide the axial stiffness of the reciprocating movement of the piston, which effectively avoids the problems of stress concentration and large dynamic mass of the plate spring. The gas spring is a new development direction of the compressor and the free piston Stirling engine, it is important to clarify its dynamic...
Miniature Stirling cryocoolers based on SWaP-C (Size, Weight, Power Consumption, and Cost) objectives for HOT IR technology are prioritize size, weight, and power at a low cost and have grown their importance in the industries of defense, aerospace, medical devices and small scale cryogenic systems. The significance of a miniature Stirling cryocooler for HOT IR technology based on SWaP-C...
Perforated plate heat exchangers (PPHEs) are made of alternately arranged high thermal conductivity plates with an insulating spacer in between. While the plates help in inter-fluid heat exchange in the lateral direction, the spacer minimizes the axial conduction losses. They, being very compact and efficient, find use in applications in many places including space, 2K helium cryogenic and...
Reciprocating liquid hydrogen pump is the key equipment for the liquid hydrogen transport technology in the hydrogen energy industry. The check valve, serving as a vital component in the pump, regulates the flow of liquid hydrogen into and out of the pump chamber during each stroke of the reciprocating motion. This paper simulates the check valve motion based on the mechanical equilibrium...
Space free piston Stirling generator technology is an important thermoelectric conversion technology in space reactor energy system. In order to realize the high reliability and low vibration characteristics of the space reactor energy system, the dual gas-coupled opposing Stirling generator is proposed in this paper, and its cooperative operation mechanism will also be investigated. Firstly,...
ABSTRACT:Pulsating heat pipes (PHPs) are promising high-efficiency heat transfer devices with high cost-effectiveness and flexibility. To investigate the heat transfer performance of cryogenic PHP with a long heat transfer distance, a 0.6 m long nitrogen PHP was tested in this paper. The PHP was made by a stainless-steel capillary tube with an inner diameter of 1 mm and an outer diameter of...
Magnetic refrigeration, a well-established technique employed to attain temperatures below the Kelvin scale, is currently gaining prominence for its application at temperatures corresponding to liquid helium and liquid hydrogen. This surge in interest is attributable to the elevated Carnot efficiency associated with magnetic refrigeration in such temperature ranges. A test stand has been...
