HETVAL is a user subroutine specifically developed to address the limitations of Abaqus in accurately handling volumetric heat flux resulting from internal heat generation within materials. The subroutine’s functionality depends on factors such as time, temperature, or evolving state variables, stored as solution-dependent variables. Accordingly, it can tackle scenarios involving phase changes during simulations. Moreover, the subroutine allows the integration of kinetic theory to account for phase changes associated with internal heat release, such as predicting crystallization in polymer casting processes. Such a multi-functional subroutine finds applications in heat transfer analyses, coupled thermal-electric studies, or temperature-displacement analyses. In this package, our primary goal is to provide valuable insights into the HETVAL subroutine and its diverse applications. Afterward, through a series of comprehensive workshops, we will guide participants in utilizing HETVAL under various conditions. In the final workshop, a problem will be presented, allowing you to explore a realistic example and gain hands-on experience in simulating the curing process within fiber-reinforced composites using HETVAL. Furthermore, to assist those unfamiliar with fiber-reinforced composites, we have included an introductory lesson covering their applications, significance, and an explanation of the importance of accurately simulating the curing process. By completing this package, you will have gained a comprehensive understanding of utilizing HETVAL across various conditions and scenarios. Moreover, you will have acquired the ability to simulate the heat generated during the curing process of fiber-reinforced composites, demonstrating a real-world application of HETVAL.