โ Scribed by C. Minas
No coin nor oath required. For personal study only.
The motional heat loss of a Gifford-McMahon (G-M) cryorefrigerator was calculated by a finite difference formulation. The two-dimensional axisymmetric finite difference model consisted of a set of equations describing the transient heat transfer in the radial and axial directions from the displacer to its housing during the displacer's cyclic motion. Several types of displacer motion were considered, including a sinusoidal profile and a profile determined by a previously developed algorithm that described the dynamics, fluid dynamics and thermodynamics of the cryorefrigerator. Several cases were analysed to determine the equivalent heat loss as a function of various parameters.
๐ SIMILAR VOLUMES
The dynamic characteristics of a pneumatically driven Gifford-McMahon cryorefrigerator are modelled when the cryorefrigerator is operating in the steady state regime. The mathematical model, which includes dynamic, fluid dynamic and thermodynamic effects, consists of a set of six simultaneous differ
A heat balance analysis of single stage Gifford-McMahon cycle cryorefrigerator is presented. Ideal refrigeration, actual refrigeration, net refrigeration and the various losses are tabulated. It is observed that pressure-volume losses account for a major fraction of the total losses.
Exergy or the available work energy function is a useful concept for analysing a Gifford-McMahon cycle. By definition, exergy of a state 1 is the maximum work that would be obtained in bringing the state to the dead state or ambient state for a heat engine. For a refrigerator, exergy is the minimum
A parametric analysis was carried out in order to examine the effect on the cooling capacities of the two stages of a commercial pneumatically driven cryorefrigerator, caused by a variation of several design parameters of the cryorefrigerator. The analysis was performed by using a previously develop
A non-linear model describing the dynamics, fluid dynamics and thermodynamics of a dynamically balanced Gifford-McMahon (G-M) cryorefrigerator has been developed. The cryorefrigerator consists of two horizontally opposed first-and second-stage displacers, a first-and a second-stage thermal regenerat