THERMAL COMFORT MEASUREMENT

Human thermal comfort is the state of mind which expresses satisfaction with the surrounding environment. Small temperature differences have large effects on many natural processes. The recommended room temperature is 21°C (70 °F) for the living room and 18°C (64 °F) for the bedroom. CBS lightweight concrete with the integrated climate control system changes the way we control our climate.

Heat Engineering and Thermal Comfort Measurement

To measure the ambient temperature in a room accurately, we have to take various facts in consideration:
  • The measurable temperature inside the room
  • The surface temperatures of the inner walls
  • Heat generated within the room radiating from electrical equipment, lights and humans

New approach to Climate Control

In the following examples we analyze different building materials exposed to an exterior temperature of 45°C. We focus on the heat entering the building and the temperature of the inner walls which, when hot, cause discomfort in the surrounding environment:

In example 1 (a house made from conventional concrete) we see that a large amount (93,4 W/m) of heat, measured in kelvin-meters per watt, enters the building. In example 2 (a house made of bricks) the heat entering the building, although reduced to 37,3 W/m, is still a considerable amount. In example 3 (a house made with CBS lightweight concrete) the heat entering the room is significantly reduced to only 11 W/m.

In example 4, CBS lightweight concrete with an integrated climate control system, consisting of a series of hard-plastic tubes embedded in the walls, is used. Instead of allowing the heat to enter the building and then attempting to force it out, the CBS climate control system has completely changed the approach to climate control: Not only the heat which enters the building from outside, but also all traces of hot air within the building are absorbed by the walls.

The integrated climate control system is controlled by a solar powered pump. The temperature in the building is easily manually regulated by setting the thermostats (which regulate the temperature of the liquid running through tubes in the outer walls) at the preferred temperature.