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Conduction: Good and Poor Thermal Conductors.

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There are many problems involved in the heating, cooling and insulating of a modern energy efficient house. However, certain measures can be taken in order to save energy and prevent excess energy gain. There are a variety of ways of solving these problems relating to heating, cooling and insulation in the home. Conduction: Good and Poor Thermal Conductors Heat is easily lost through the exterior walls of a house because of the conductivity of the materials the walls are built with (ie brick). Using higher levels of insulation can reduce this problem. This technique reduces heat transfer from the heated interior to the cold outside during winter, and insulated the house from heat in summer. The following are a variety of methods of framing used to overcome these problems. Optimum value engineering - this method utilises strategically placed wood in order to create space for insulation Structured insulated panels - plywood or oriented-strand board is laminated to foam board. ...read more.


Total window area should also not exceed 8 to 9 percent of the floor area for those rooms. Double glazed windows are an extremely effective method in preventing heat loss through windows. This involves two pieces of glass instead of one, with a layer of air between them, which acts as the insulator. Adding a third or fourth layer can increase the benefits even more. The amount of air inside the space is also a factor in how efficient the windows are - the larger the space, the more effective. This is relevant to the width of approximately one inch, because spaces larger than one inch wide encourage convection currents. Other gases, such as argon have been substituted for air, as they are less dense, and have a lower conductivity than air. Overhangs and the position of the sun North facing windows should have extended eaves. ...read more.


This problem can be solved by planting deciduous trees (trees that lose their leaves in winter) is a beneficial factor in an energy efficient house. These trees in summer will block heat and shade the house, but in winter will allow the heat to radiate into the house. Convection currents: Convection currents can be beneficial in maintaining air quality and cooling air. Ceiling fans, high windows or cupolas help to create natural convection currents. If a house has more than one storey, than convection currents can also be beneficial. Heating systems are implemented in the lower floors, and convection currents carry the hot air up to other levels, through floor grills. However, if there aren't any floor grills, the warm air will stay at ceiling level and will not be utilised for heating. As the cool air is pushed down, this means that if other appliances such as fans are not utilised, in winter convection currents are a hindrance. ...read more.

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