Orientation Optimization of Flat Building in Humid Tropical Climate: Case Study on UPN Veteran East Java’s Apartment

Flats building is a particular type of building with high occupancy levels. High occupancy building has specific indications from the appearance. The spatial organization consist of many similar room with similar area planning. The arrangement between the units of the same type and shape are set in a row for the overall efficiency of spatial planning. Hot-humid tropical climate has the characteristics of environmental conditions with high temperatures and humidity. Areas in humid tropical climate have the characteristics of high intensity direct sunlight. Indonesia is located on the equator, so each direction of building elements have an opportunity to get a large enough sunlight and in some cases even too abundant. The larger the building envelope which are exposed to sunlight result in greater changes in the temperature rise inside the building.