Thermal Effect of "Changing Clothes Building" with Changeable Thermal Property of Wall Surfaces
Abstract
To realize a desirable building environment by saving energy and low global emission, the authors have developed an environmentally harmonized “Biomimetic Building”, which has the environment physiological functions of human and other organisms as well as human wisdom for environment symbiosis and control. This paper takes up the “Changing Clothes Function” as human wisdom, describing firstly its application to buildings and experimental results of the thermal effect by using experiment wall models whose surface thermal properties, such as absorptivity and emissivity, can change, depending on their temperatures. The experimental results showed that the temperature decrease of the ‘changing clothes wall models’ with selective emission surface was 32-37 ºC in summer compared to ‘non changing clothes wall model’, while the temperature increase with selective absorption surface was 3-29 ºC in winter. Further described is the thermal effect estimated theoretically of the “Changing Clothes Building (CCB)”. According to the simulation results of annual heat load, the saving energy effect due to the “Changing Clothes Function” of the typical detached house in Japan was 7 to 32% in sensible heat load compared to the “Non Changing Clothes Building (NCCB)”. The “CCB” enabled us to confirm the remarkable thermal effectiveness.