When we open the horizontally hung door, cold air remains in the refrigerator
and energy loss can be minimized. Therefore, the horizontally hung door has an
uncoupled design and is a better design than the vertically hung door. Is the
horizontally hung door always better? As far as the functional requirements
defined here are kept, it is correct. Suppose that constraints are proposed for the
amount of stored food or convenience to access items. Then the problem will be