Just as the human body has heat exchange processes with the environment, the building can be similarly considered as a defined unit and its heat exchange processes with the outdoor environment can be examined. Heat energy tends to distribute itself evenly until a perfectly diffused uniform thermal field is achieved. Heat tends to flow from higher temperatures to lower temperature zones by conduction, convection and radiation. The rate of heat flow by any of these three forms is determined by the temperature difference between the two zones or areas considered. The greater the temperature difference, the faster the rate of heat flow.

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