we would feel comfortable when the temperature is around 22-27
degrees Celsius with 20-75% Relative Humidity. It is
clearly seen that Thailand is not categorized in the comfortable zone climate.
However, if we adjust our site environment with shades of trees or water mist,
we can reduce the temperature around the house. If the position of the house
can be placed where there is ventilation, this will also help carry cooler
temperature to the building.
is the prevailing wind from?
the wind travels in from all directions; however the prevailing winds come from
the same directions twice a year;
September: The prevailing wind is from the southwest and the south.
January: The prevailing wind is from the northeast and the east.
also depends on our locations. Different locations such as mountains, river or
building may alter the wind direction and ventilation.
time where wind is most needed is in summer from April – May, this is when the
prevailing wind blows from the southwest and the south. Hence, the air panel
should be faced towards these directions; however site environment should be
adjusted such as creating shades, planting grass and trees, and creating water
evaporation to allow cool air to flow in the house.
and Heat … Where do they come from?
The sunrise and sunset directly
affects the heat. Sunrise is the instant at which the upper edge of the sun
appears over the eastern horizon in the morning, crosses the south (or the
north) and travels belowthewesternhalf of thehorizon in the evening.
sunlight appears over the north in May to August (4 months)
sunlight appears over the north in January to April and September to December
The sun angle
directly affects heat transfer to buildings. If we understand, we can avoid the
direct impact from the sunlight or build shade where the sunlight is received.
highest temperature in the afternoon and the sunlight angle direction cause the
southwest and the west to absorb the highest average sunlight throughout the
year. Hence, buildings walls towards the southwest and the west should be
avoided to reduce the impact of sunlight.
you know and understand the climate, we will move on to how to make our house
cooler, how to prevent heat and how to add more comfort in the building
techniques in the next issues.