• Tokyo University of Marine Science and Technology.
    Tokyo University of Marine Science and Technology.

Mitsubishi Electric Corporation has developed a new airflow-control technology that both visualises and analyses airflow from air-conditioning systems and temperature distribution for optimized room-wide comfort.

The technology predicts airflows and temperatures, which vary according to the room shape and air-conditioning system layout, to determine how to minimise uneven temperatures and discomfort due to excessively strong airflow.

As such, the technology contributes both to occupant satisfaction and to building asset value. Mitsubishi Electric also expects to use its new solution to advise building owners and designers on how to enhance indoor layouts for increased comfort.

In recent years, due to the impact of COVID-19 and other factors, there has been an increasing emphasis on the healthfulness and comfort of indoor spaces, including ventilation.

However, it has been difficult to use built-in sensors of A/C units to collect data on airflow due to great variations in room and air-conditioning system layouts.

Details of the new technology will be announced later this week at the 55th Japanese Joint Conference on Air-conditioning and Refrigeration, which will be held at the Etchujima Campus of Tokyo University of Marine Science and Technology.

A key feature of the new technology is computational fluid dynamics (CFD) which is used to predict airflow and temperature distribution in out-of-the-way places, such as under desks or behind partitions, or due to other A/C units nearby.

Using airflow and temperature distribution as comfort indices, ideal airflow angles and volumes are automatically determined and controlled for optimized room-wide comfort.

Mitsubishi Electric's new technology generates three-dimensional models using information on room and air-conditioning system layouts, and it also predicts airflow and temperature distribution using CFD analysis to test various conditions, including airflow angles/volumes and heat levels.

From CFD analysis results, the technology selects the most ideal conditions and controls the A/C system's actual operation.

Data required for airflow analysis, such as the locations of walls, floors, columns and A/C equipment, is extracted from building-information modelling (BIM) data to generate three-dimensional models.

Airflow analysis is performed by virtually testing models incorporating different furniture, indoor units and ventilation system layouts to visualize airflow, temperature-distribution and ventilation effects.

Constructing indoor models for CFD requires time and effort, and experts capable of analyzing the resulting information are limited.

In response, Mitsubishi Electric has developed technology to lighten this workload and to simplify the processes of determining ideal settings as well as visualize and display the results intuitively.

The solution collects information on room, indoor units and ventilation system layouts using BIM data (method for centrally managing and utilizing building lifecycle information) and then generates three-dimensional room models for airflow analysis.

Room, indoor units and ventilation system layouts can be changed easily on-screen and the model numbers of specific Mitsubishi Electric A/C systems can be entered from a database. Results of different patterns can be compared using airflow animations and color-coded diagrams* of temperature contours, CO2 concentration levels and times required for air from vents to reach specific areas.