External Venetian Blind Effectiveness from Evaya

EFFECTIVENESS OF EXTERNAL VENETIAN BLINDS
heat and external venetian blind diagram Assessing the impact of window blinds on levels of heat gain through glass.

Heat gains that occur within internal spaces can be classified on the basis of their origin. These may result directly from internal sources of heat or from the external environment.

A External Blinds - Slats angled at 45 degrees
B Double Glazing
C Sun's Radiation
D Reflection

Heat sources produce thermal energy which acts to directly increase air temperature. This thermal load may be absorbed by water vapour.

Internal sources of heat gain production include, but are not limited to, body heat, lighting, machinery and heat passage between rooms.

Heat gains from the external environment are caused by the passage of solar radiation through mediums and structures such as walls, ceilings, glazed window surfaces, doors and the infiltration of external air.

External Heat Gains have a decisive impact on the thermal load of buildings. Window design, surface area and orientation are all factors which affect this loading dramatically.