Abstract
HVAC system simulation programs in Japan looks having ceased its development due to unhappy bubble economy boost followed by its collapse during the late 1980s to 1990s. In this period international environment in this area was far different from Japan. The TRNSYS, HVACSIM+, DOE2, BLAST and then EnergyPlus have been constantly upgraded to meet the world needs for HVAC application and high-technological developments, in contrast to the Japanese state as represented by popular application of distributed packaged unit system. The present paper overviews the state of the art in HVAC simulation technology in Japan compared with international activity and gives alarms to Japanese HVAC engineers as well as those people who are responsible for policy making on energy, environment, science and technology and engineering philosophy.
