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Engineering is the goal-oriented process of designing and making tools and systems to exploit natural phenomena for practical human means, often (but not always) using results and techniques from science. The development of technology may draw upon many fields of knowledge, including scientific, engineering, mathematical, linguistic, and historical knowledge, to achieve some practical result. | Refrigeration and Air-Conditioning Refrigeration The process of removing heat. Air-conditioning A form of air treatment whereby temperature humidity ventilation and air cleanliness are all controlled within limits determined by the requirements of the air conditioned enclosure. BS 5643 1984 Refrigeration and Air-Conditioning Third edition A. R. Trott and T. Welch 3u TTERWORTH IgjEINEM ANN OXFORD AUCKLAND BOSTON JOHANNESBURG MELBOURNE NEW .
