20 September 2011
A new type of central air-conditioning system for Japanese condominiums has
been developed, tested and evaluated. This system is composed of a heat pump airconditioner, a small ductwork and underfloor chambers, which are usually formed to prevent the floor impact sound and vibration, and which are thermally insulated well for this
development. The paper describes the measurements and evaluations that were made in both winter and summer. Room temperature was generally stable because of controlling supplied air volume. Floor surface temperature was about 2 ? higher than room air temperature in winter. On the other hand, it was about 1 ? colder than room air temperature in summer. These results suggest that this system should create thermal comfort and high energy efficiency in Japanese condominiums.