Heat energy

Jun 30th, 2015
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Alhambra Medical University
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Most of us use the word ‘heat’ to mean something that feels warm, but science defines heat as the flow of energy from a warm object to a cooler object. Actually, heat energy is all around us – in volcanoes, in icebergs and in your body. All matter contains heat energy.

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Histroy of Fans world wide.A hand-held fan is an implement used to induce an airflow for the purpose of cooling or refreshing oneself. Any broad, flat surface waved back-and-forth will create a small airflow and therefore can be considered a rudimentary fan. But generally, purpose-made hand-held fans are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.The movement of a hand-held fan provides cooling by increasing the airflow over the skin which in turn increases the evaporation rate of sweat droplets on the skin. This evaporation has a cooling effect due to the latent heat of evaporation of water. Fans are convenient to carry around, especially folding fans.The earliest electric fans appeared in the early 1880s. The fan was basically a blade attached to an electric motor. The development of the fields of Electrical Engineering and Aeronautical Engineering paralleled each other in the industry of electric fans. The early electric motors were bipolar. They were direct current, with all exposed workings. The early blades were adapted from the windmill, with usually six pie shaped flat leafs of brass. Speed control was attained using resistance. In almost all cases resistance wire was used, and in a few cases, the light bulb was used a resistance. These early fans were either a novelty, or an expensive appliance, used in large

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