Elastocaloric effect of shape memory alloys occurs owing to the flow of the latent heat associated with the stress-induced martensitic transformation during superelasticity. This effect has been considered as the principle of heat pumping by mechanical work. Present study has examined the heat flow in terms of thermodynamics and obtained the efficiency of refrigeration in an explicit mathematical form. The adiabatic change in temperature is also formulated by a heat transfer analysis and the temperatures are measured using Nickel Titanium helical springs. We observed the change of 30 K at least, which is as large as the largest magnitude among the changes so far reported. A conceptual model of heat exchange systems is proposed and is now under investigation.
Kato et al. (Wed,) studied this question.