Optimization of solar energy use for low-energy residential houses in Japan is proposed in order to design rational solar energy systems, it is important to recognize the structure of energy consumption of the residential houses as well as the climatic conditions of the region. Using statistical data obtained from an energy survey of residences in Japan, it has been found that the three major portions of purchased energy are space heating, domestic hot water heating, and household appliances (including lighting and cooking).

A new version of the ASHRAE's Standard 62, which concentrates on ventilation and indoor air quality 
issues, has recently been released for pubIic review. What elements have.changed from the 1989 edition?

House depressurization is a ubiquitous, dangerous problem. As regional mechanical codes move toward consolidation into one International Mechanical Code, now is the time to add a performance testing requirement for house depressurization.

The Centre for Building Performance Research at Victoria University School of Architecture has recently concluded R&D for the Energy Efficiency Clause of the New Zealand Building Code. This report, contributed to the BEPAC Newsletter, discusses some of the issues that arose in the course of the work.