Multi-zone thermal control systems for residential buildings: A case study of a Japanese single family home

The primary goal of this study was to develop a multi-zone control system for homes that provided a healthy indoor environment with the minimum energy consumption. The attainment of this goal was important to solving not only residential energy consumption, but also in helping global warming reduction. This study utilized a combination of physical experiments and computed simulations as a primary research methodology. A full scale model that simulates an actual Japanese residence was tested in the following steps.; A preliminary background study was intended to clarify multi-zone climate control system technologies. Energy consumption and the thermal distribution in the test house were simulated with computer software. The simulation indicated that the new control system was effective in reducing temperature differences and saving energy without any reduction in comfort. The energy consumption and the thermal distribution were also measured by conducting physical experiments. The system efficiency of thermal comfort was verified with both simulation and measurement data. The energy consumption and cost efficiency were analyzed in comparison with conventional systems as well. Finally, interviews with and questionnaire surveys with actual residents in the test house were conducted to assess their comfort and satisfaction.; The study successfully suggested a new type of HVAC system incorporating a multi-zone thermal control system. This system could be installed not only in new houses but also in existing ones. The solutions gained from this study can be applied to buildings in other countries as well.