How is thermal energy lost when a person exits a building through an exterior door in the winter?

Writing a paper that answers the following topic and questions.
Topic: How is thermal energy lost when a person exits a building through an exterior door in the winter?

Questions to answer that need to be included in the paper with CALCULATIONS and resources.

1. Assumptions used and why.
2.Equations needed to determine variables necessary for developing the solution and why the equations were necessary.
3.Descriiption of how you developed the values for variables.
4.Descriiption of your level of confidence in the variable values.
5.Overall level of confidence in the solution and why.

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