九州大学 エネルギー基盤技術国際教育研究センター

Energy Conservation Technology Division -Aya HAGISHIMA-

Technologies for Household Energy Saving

Professor

Aya HAGISHIMA

Specialization

Urban and building environmental engineeringysics

Affiliation

Faculty of Engineering Sciences

Research Topics

  • Prediction of time variation of total utility demand in residence with stochastic nature
  • Forcing effects on momentum, heat and passive scalars enhanced by urban surface layer
  • Estimation of space cooling requirement in buildings located in tropic and sub-tropic regions
  • Holistic evaluation of passive/active building designs for energy saving

Research Outline

Various activities done inside buildings contribute significant fraction of the energy consumption and CO2 emission in the world, and holistic countermeasures for the energy saving in buildings are essential for the global warming issue.
Under these circumstances, we have conducted a series of researches from a viewpoint of building environmental engineering to develop a holistic numerical simulator of the stochastically time-varying utility demand of residence, such as thermal requirement of air-conditioning, electricity, city water, and hot water.

Time variation of occupant behavior and air-conditioning load

Time variation of occupant behavior and air-conditioning load

The diurnal variation of demand of electricity and thermal requirement in residence is strongly affected by the behavior schedule of occupants, thus, statistically diverse. To attain the total high performance of energy supply system, accurate estimation of such a feature is essential.

Visualization of urban airflow over a building array

Visualization of urban airflow over a building array

Natural ventilation is one of effective passive method for the energy saving in buildings, and the performance of the natural ventilation depends on the turbulent nature of the urban airflow generated by building roughness.