Butterfly House

New Construction

  • Building Type : Isolated or semi-detached house
  • Construction Year : 2005
  • Delivery year : 2006
  • Address 1 - street : 34190 UBON RATCHATHANI, Thailand
  • Climate zone : [Aw] Tropical Wet & Dry with dry winter.

  • Net Floor Area : 120 m2
  • Construction/refurbishment cost : 38 000 €
  • Cost/m2 : 316.67 €/m2

Proposed by :

  • Primary energy need :
    82.5 kWhpe/m2.year
    (Calculation method : Other )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building
This is an energy efficient house that was built by the University of Ubonratchathani in 2005 as part of a research project funded by the Ministry of Energy of Thailand. 2-storey house with 2 bedrooms on the second floor and living space downstairs is made of concrete structure. Upper floor plate is bigger to act as shading for lower one. The distinct feature is a chimney aligned at center of the house to ventilate during the daytime. The roofs are break into 2 pieces and tilted like butterfly wings shape into the chimney to create the pressure different for venturi effect under the roof and gain benefit from night radiation. Moreover, all main functions are categorized as service zone and living zone, oriented and break them by the chimney.


Contracting method

Public Private Partnership

Energy consumption

  • 82,50 kWhpe/m2.year
  • 86,58 kWhpe/m2.year
  • Other

    Lighting 2%
    Air condition 86%
    Ceiling fan 1%
    Equipment 9%
    Misc 2%

Envelope performance

  • 0,43 W.m-2.K-1
  • Typical material for wall is composed of lightweight concrete block with cellulose fiber cement outside and 1" polyurethane foam in between to block external heat gain and moisture. For fenestration area, ocean green float glass is utilized due to the low shading coefficient property (SC=0.59) while the visible ray transmittance is high (VT = 0.72) to maximize the benefit from daylight. Roof has double layers to create venturi effect for attic ventilation.

Real final energy consumption

    75,00 kWhfe/m2.year


    • No heating system
    • No domestic hot water system
    • Fan coil
    • Natural ventilation
    • Nocturnal ventilation
    • No renewable energy systems

    High-efficient air-conditioners (EER > 12)



    Africvs Co.,Ltd. | Chimney is a part of architectural design.

    [email protected]

    Structural work / Passive system

    Vertical cavity for ventilation, most effectively in the daytime

    Temperature inside the house is reduced.

Construction and exploitation costs

  • 3 850
  • 38 500

Biodiversity approach

    Located on a large open space area with prevailing wind most from the south

  • 224,00 m2
  • 40,00 %
  • 80,00

Reasons for participating in the competition(s)

​The house is a product stemmed from a housing design competition that had a condition to build a real house in order to collect data on thermal comfort. Passive design using radiation cooling, natural ventilation, solar shading, and roof insulation was used effectively.​

Building candidate in the category

Energy & Hot Climates

Energy & Hot Climates

Green Building Solutions Awards 2016

Author of the page

  • Other case studies



    Green Building Solutions Awards 2016