What are the equipments use surrounded by 2nd canon of thermodynamics?

The second law of thermodynamics is considered to be the most fundamental law of science. It explains not single the working of engines, refrigerators and other equipments used in our daily vivacity, but also highly advanced theories like big blast, expansion of universe, heat death etc.
Source(s): http://www.brighthub.com/engineering/mechanical/articles/4349.aspx
Second ruling says that heat travels from hot source to cold source and it requires work done to produce heat travel from cold source to hot source.

Air conditioning, Refrigerator etc are the best example.Even IC engine and all machines come into this category.

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