Green Roof Heat Loss

The hamerschlag hall green roof was found to lose 26 less heat than the control roof in heating months.

Green roof heat loss.

As roofs are the site of the greatest heat loss in the winter and the hottest temperatures in the summer. Informational signs can accompany green roofs to educate building occupants and visitors to the benefits of the green roof and how to protect the resource. In winter the green roof minimizes heat loss through added insulation on the roof. The heat loss through the roof without green vegetation is determined to be 0 388 gj for scenario 1 and 3.

Green roofs replace a hard infrastructure with one that s not only more efficient but also beautiful and useful. A green roof or rooftop garden is a vegetative layer grown on a rooftop. The effect that the green roof media has on the thermal performance of the roof system was evaluated. The heat transfer through the walls and roof during heating season can be viewed in fig.

The allegheny county office building green roof was found to lose 8 2 less heat than the control roof in heating months and gain 75. A 2005 study by brad bass of the university of toronto showed that green roofs can also reduce heat loss and energy consumption in winter conditions. A green roof system is an extension of the existing roof which involves at a minimum high quality water proofing root repellent system drainage system filter cloth a lightweight growing medium and plants. Thermal reduction and energy conservation.

Energy conservation translates into fewer greenhouse gas emissions. Because green roofs store water in the growing media and plants latent heat loss is accomplished via transpiration from plants and evaporation of moisture from the growing medium collectively referred to as evapo transpiration. If green roofs become a common building initiative cities can reduce the uncomfortable effects of urban heat islands. Green roofs have been proven to help reduce heat islands.

Green roofs improve air quality. It is clearly seen that the heat loss from the green roof is notably greater than the building having no green vegetation on the roof. They can reduce heating by adding mass and thermal resistance value also can reduce the heat island by increasing evapotranspiration. This energy is known as latent heat.

Plant leaves trap dust particles from the air and evapotranspiration cools ambient temperatures. A green roof can also provide a refuge for insects and birds that have lost their natural habitat due to urban development and the loss of green space. Green rooftops offer office workers a rooftop retreat and apartment residents a place to plant gardens or relax.