Butterfly House

Last modified by the author on 16/06/2016 - 09:25

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 €
  • Number of Dwelling : 1 Dwelling
  • 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)

Urban environment

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

  • 224,00 m2
  • 40,00 %
  • 80,00



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

    [email protected]


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    Vertical cavity for ventilation, most effectively in the daytime

    Temperature inside the house is reduced.

Construction and exploitation costs

  • 3 850
  • 38 500

Reasons for participating in the competition(s)

Since the project is selected to be in a final round of energy saving house design competition by Energy Policy & Planning Office of Thailand, intended to be a model for design technique study, the project is constructed. This house is composed of various passive design technique such as stack ventilation, night radiation, venturi effect, self-shading and building orientation. The building is equipped with thermocouple to study on an effect of these design technique.

Building candidate in the category

Energy & Hot Climates

Energy & Hot Climates

Green Building Solutions Awards 2016

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Green Building Solutions Awards 2016