A room or a house is modified by setting a stack (chimney) to take the advantage of thephenomenon of stack effect. This stack is useful for air circulation so that the room becomecomfortable. The difference of colour on the outside wall of the house will also affect the roomtemperature because the stored thermal energy in the house will be different. The darker house wallwill keep more thermal energy than the brighter. Meanwhile, the house that uses exhaust fan willkeep less thermal energy than a house that did not use any exhaust fan.The high of required stack effect phenomenon can be calculated based on the stored thermalenergy of the room. In the miniature house using exhaust fans, the chimneys or towers should be putat the 0.55-meter-high roof to a house without a paint, 0.35 meter for the white-painted house, 0.55meter for the gray painted house, and 0.36 meter for the yellow-painted house. While for houseminiature without exhaust fan (naturally), chimney should be placed to the 0.86-meter-high roof forthe house without paint, 0.74 meter for the white-painted house, 0.85 meter for the gray paintedhouse, and 0.75 meter for the yellow-painted house.
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