In this work, phenomenological model (PM) is used to simulate the magnetocaloric effect (MCE) of Nd0.5Sr0.5MnO3 (NSMO) sample synthesized at various values of temperature of calcination (Tcal). The results showed that MCE of NSMO samples depends strongly on Tcal, achieving that a conventional MCE for nanocrystalline NSMO samples. However, the thermomagnetic behavior of bulk NSMO sample NSMO contains both conventional MCE and inverse MCE. MCE of NSMO improves powerfully with increasing Tcal. The calcination process is concluded as a powerful tool for improving MCE for NSMO. Especially, NSMO parameters in MCE of some published works are better, with a value equal to or greater than the corresponding MCE parameters in the same value of ΔH. MCE of NSMO system, particularly for nitrogen and hydrogen liquefaction, covers an excellent temperature range is of interest for MR.