Which phase change results in release of energy?

Answer 1

I'm interpreting your question as "which phase changes can be categorized as releasing energy from a material into the material's environment?" so this question is mostly thermodynamic:

The phase changes that are associated with a decrease in temperature, such as condensation (gas to liquid), freezing (liquid to solid), and the deionization of plasma (gaseous plasma regaining electrons as energy levels subside).

generally phase changes don't involve a release, but rather an exchange of energy as matter changes its physical state. The changes in matter that result in releases of energy are chemical changes, and nuclear changes (fusion and fission).