Performances of four magnetic heat-pump cycles
Conference
·
OSTI ID:6609766
Magnetic heat pumps have been successfully used for refrigeration applications at near absolute-zero-degree temperatures. In these applications, a temperature lift of a few degrees in a cryogenic environment is sufficient and can be easily achieved by a simple magnetic heat-pump cycle. To extend magnetic heat pumping to other temperature ranges and other types of applications in which the temperature lift is more than just a few degrees requires more involved cycle processes. This paper investigates the characteristics of a few better-known thermomagnetic heat-pump cycles (Carnot, Ericsson, Stirling, and regenerative) in extended ranges of temperature lift. The regenerative cycle is the most efficient one. For gadolinium operating between 0 and 7 T (Tesla) in a heat pump cycle with a heat-rejection temperature of 320 K, our analysis predicted a 42% loss in coefficient of performance at 260 K cooling temperature, and a 15% loss in capacity at 232 K cooling temperature for the constant-field cycle as compared with the ideal regenerative cycle. Such substantial penalties indicate that the potential irreversibilities from this one source (the additional heat transfer that would be needed for the constant-field vs the ideal regenerative cycle) may adversely affect the viability of certain proposed MHP concepts if the relevant loss mechanisms are not adequately addressed.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/CE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6609766
- Report Number(s):
- CONF-901109-18; ON: DE90015606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420201* -- Engineering-- Cryogenic Equipment & Devices
425003 -- Engineering-- Power Cycles-- Stirling-- (1980-)
425007 -- Engineering-- Power Cycles-- Other-- (1980-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARNOT CYCLE
COEFFICIENT OF PERFORMANCE
CRYOGENICS
ELEMENTS
ENERGY TRANSFER
ENTROPY
GADOLINIUM
HEAT PUMPS
HEAT TRANSFER
MAGNETISM
METALS
PERFORMANCE
PHYSICAL PROPERTIES
RARE EARTHS
STIRLING CYCLE
THERMODYNAMIC CYCLES
THERMODYNAMIC PROPERTIES
THERMOMAGNETISM
ULTRALOW TEMPERATURE
420201* -- Engineering-- Cryogenic Equipment & Devices
425003 -- Engineering-- Power Cycles-- Stirling-- (1980-)
425007 -- Engineering-- Power Cycles-- Other-- (1980-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARNOT CYCLE
COEFFICIENT OF PERFORMANCE
CRYOGENICS
ELEMENTS
ENERGY TRANSFER
ENTROPY
GADOLINIUM
HEAT PUMPS
HEAT TRANSFER
MAGNETISM
METALS
PERFORMANCE
PHYSICAL PROPERTIES
RARE EARTHS
STIRLING CYCLE
THERMODYNAMIC CYCLES
THERMODYNAMIC PROPERTIES
THERMOMAGNETISM
ULTRALOW TEMPERATURE