Alle Beiträge von Oskar Pankratz

METTA Technological College – Cooling by Natural Ventilation

Stefanie Bauer, Karina Eder, Thomas Gruber, Katharina Höfler, Elvira Kinzner

Metta Technological College is a project that has been developed to offer Thai students a secondary education, focussing on technical and artisanal skills. The site is located in the heart of northern Thailand, in the province of Phetchabun.



Thermal Simulations and Building  Physics  by Oskar Pankratz



For Tropical Savanna Climate: hot, sunny, rainy, wet, little wind
• avoid sun – north/south orientation
• keep radiation out – insulation of roof
• as much shadow as possible – trees in courtyards
• use wind as much as possible – cross ventilation
• use day and night temperature difference – thermal mass
• slowly turning ceiling fans


Preliminary Simulations: Compared Results,  Indoor -Temperatures at two  Classrooms with different thick insulation  of  Wood-Wool-Boards

X-Axis: Month; Y-Axis: Houres a Day; Colors: Temperature Range in Celsius; Temperature Comparison Classroom A (5 cm Wood-Wool-Board) and B (20 cm Wood-Wool-Board) The Temperatures in A are significant higher than in B. Keep in mind during holidays from March till the end of April are no students inside. In classroom B are just a few houres during a school year exceeding 32° C.. In hot countries the extendet comfort zone approximately goes up to 32° C, if the air speed is 2 m per second.

Daily crossventilation from midnight till 11 am. Classroom A Roof with 5 cm wood-wool-board, moveable openings 30 m² with insect-screen net opening 18 m².
Classroom B Roof with 20 cm wood-wool-board, openings 30 m² with insect-screen net opening 18 m².  Floor area, wall inclusive –   75 m²

Internal gains – 12 People from eight to six plus 8W per m² lights and fan.

Hottest day in April – comparison indoor-temperatures Class A and Class B
Remember – these are the temperatures during the holidays. During the hot hours, class B is 5 degrees lower than the outside temperature. 20 cm insulation is neccessary to achieve this 5 degree Kelvin difference between inside and outside. With 5 cm insulation you can expect 3 degrees Kelvin.
TMY2 artificial Weatherfile generated with Meteonorm


Simulating the sun in Thailand – Whorkshop with Gregor Radinger and the students in Krems Donau-Uni Lichtlabor