Conveners
C3Or2C - Compressor Expanders and Other Components
- Xilong Wang (European Spallation Source ERIC )
- Mark Zagarola (Creare LLC)
Developments over the past few years allow Linde Kryotechnik to economically replace the turbines of a cryogenic plant with state of the art technology leading to several advantages. Stand out among others are higher efficiency of the turbines, easier operation of the plant, increase of reliability and an update of the design point regarding current customer demands which improve the overall...
Turbo- expander is the heart of the helium refrigerator, and the gas bearing as the critical component influences the stability of the turbine. There is 300K operating temperature difference between the expansion wheel and the gas bearing in the helium turbine. Therefore, it is necessary to consider the thermodynamics of the bearing-rotor when studying bearing dynamic stability. In this paper,...
Cold compressor is the core component to develop the facility of large-capacity refrigeration at superfluid helium temperature. It is operated under extremely low temperature and low pressure which involves technical issues about temperature and heat flux such as failures of the actuating motor resulting from overheating and performance decrease due to heat leak to cryogenic side. To analysis...
High-effectiveness heat exchangers are a ubiquitous component of cryogenic systems, but their performance typically falls short of model-based expectations. The following paper details modeling efforts of a heat exchanger designed to achieve an effectiveness in excess of 99% within a prescribed envelope of volume, weight, pressure drop, and operating conditions. Simulation efforts focus on...
Reducing liquid hydrogen boiloff from storage tanks is a key challenge facing the nascent hydrogen vehicle economy in addition to extended mission space-stage vehicles. However, the extreme cryogenic environment of liquid hydrogen necessitates novel refrigeration methods with components engineered for high-reliability. This paper presents initial experimental results of a Heisenberg Vortex...
A proof-of-concept, two-condenser nitrogen pulsating heat pipe (PHP) has been developed for use in applications with redundant cryocooler installations. The PHP design presented here comprises two independent PHP condensers, each thermally sunk to an independent cryocooler cold head, with the two associated PHP evaporators attached to a common heat load. With two installed cryocoolers this PHP...
Superconducting electronics and spectral-spatial holographic systems are being developed for advanced digital communications. These devices must operate at cryogenic temperatures of near 4 K. Liquid helium is undesirable for mobile missions due to logistics and scarcity, and commercial low-temperature cryocoolers are unable to meet size, weight, power, and environmental requirements for many...
