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Project Description

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. 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

Butterfly house 1
2000px thailand ubon ratchathani locator map.svg
Btf house map
Ex
Btf house bird eye view 2

Building Details


Single House

New building project

2

150 m²

120 m²

80 m²

OTTV/RTTV

USD 43,000

USD 290

2005

2006

Project Team


Chulalongkorn University

Stonehengh Co., Ltd.

Dr.Atch Sreshthaputra

www.africvs.com

Stonehengh Co., Ltd.

Dr.Atch Sreshthaputra

Dr.Atch Sreshthaputra

Dr.Atch Sreshthaputra

Climate Analysis


Ubonratchathani has a Tropical Savanna Climate. The climate is arid with little rain in winter, relatively high temperatures in summer, cool in winter, and rain from May to October, about 70-90 days. The average annual temperature is 28-29 degrees Celsius. Maximum temperatures average 33-34 degrees Celsius and minimum temperature averages 23-24 degrees Celsius. April is the hottest month of the year, while winters are cool in January.

Udon thani climate graph

Design Approach


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

Stack ventilation. Natural Ventilation, Radiative Cooling. Solar Shading.
Siteplan

Document


Special Feature


Daylight from north façade.

Low-flow, low-flush bathroom fixtures

Stack Ventilation and Venturi Effect

Local materials within 500 kM

Large trees on west and south side

Building Material


Reinforced Concrete

Autoclaved Aerated Lightweight concrete block with 1" Polyurethane Foam and Gymsum Board

Glazing percentage of walls - 0.2 U-value of windows - 5.8 W/m2.K Solar Heat Gain Coefficient (SHGC) of windows - 0.68 Visual Transmittance of windows - 0.72

Laminate

Double roof with ventilated cavity, Metal sheet and 6" Fiberglass Insulation

Energy systems


T-5 Fluorescent lamps

N/A

Electric ceiling fan in living room

Split-type air-conditioners

High-efficient air-conditioners (EER > 12)

None

Lessons Learned


Natural ventilation works effectively all year round especially at night. Daylight is not really necessary as the occupants are not inside during the daytime. Stack ventilation is difficult to control and predict at times.