Thermodynamics cycle analysis and numerical modeling of thermoelastic cooling systems

• Listed feasible thermodynamic cooling cycle options for thermoelastic cooling/heat pump.
• Derived analytical COP and cooling capacity equations for the thermoelastic cooling systems under Brayton cycle design.
• Developed a dynamic system model in Simulink.
• Conducted extensive parametric studies for the operating parameters and geometric parameters.
• Developed the loss analysis and COP projections for future reference.

To avoid global warming potential gases emission from vapor compression air-conditioners and water chillers, alternative cooling technologies have recently garnered more and more attentions. Thermoelastic cooling is among one of the alternative candidates, and have demonstrated promising performance improvement potential on the material level. However, a thermoelastic cooling system integrated with heat transfer fluid loops have not been studied yet. This paper intends to bridge such a gap by introducing the single-stage cycle design options at the beginning. An analytical coefficient of performance (COP) equation was then derived for one of the options using reverse Brayton cycle design. The equation provides physical insights on how the system performance behaves under different conditions. The performance of the same thermoelastic cooling cycle using NiTi alloy was then evaluated based on a dynamic model developed in this study. It was found that the system COP was 1.7 for a baseline case considering both driving motor and parasitic pump power consumptions, while COP ranged from 5.2 to 7.7 when estimated with future improvements.