Passive Cooling Roof Design

Researchers have developed a numerical model that was able to verify the effects on passive cooling of buildings caused by the density variation of vegetation of green roofs.

Passive cooling roof design.

Preventive techniques are the steps you can take to keep heat from building up in the first place. How roof cooling works. Well designed building envelopes minimise unwanted heat gain and loss. Designing the floor plan and building form to respond to local climate and site.

Passive design utilises natural sources of heating and cooling such as the sun and cooling breezes. Passive cooling is free unlike air conditioning which is expensive to install and run. When sunlight strikes a building the building materials can reflect transmit or absorb the solar radiation. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f.

Passive cooling is a building design approach that focuses on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low or no energy consumption. Engineers worked to change the concept of roof cooling from a ponding to an evaporative technique. Passive cooling should be part of an overall approach to passive design. Modulation is a technique used to transfer the heat via thermal mass or natural cooling dispersing it at a later time or when needed.

Cool roofs a cool roof is one that has been designed to reflect more sunlight and absorb less heat than a standard roof. To achieve thermal comfort in cooling applications building envelopes are designed to minimise daytime heat gain maximise night time heat loss and encourage cool breeze access when available. This cooling reverses the heat flow through the roof. These are the two main categories of passive cooling.

Depending on your situation climate house style personal preferences etc it is most effective if you incorporate the principles of both passive cooling and passive heating. Heat is now transferred out of the building through the roof. In addition the heat produced by the sun causes air movement that can be predictable in designed spaces. With just an error.

Passive solar design refers to the use of the sun s energy for the heating and cooling of living spaces by exposure to the sun. Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles. This is a simple building integrated cooling scheme that uses nighttime radiation cooling from a metal roof to cool air in the attic space. Attic air is then circulated into the living area to provide cooling.

Passive cooling design principles.