In recent years ， natural ventilation system is widely used for sustainable buildings ． However ， systems without proper managements and maintenances are often observed ， Noise and pollution are major problems in the urban enVironment ． Wide investigation was conduCted ft 〕r 72 bllildings ． The reason of less use of natUral ventilation system was inves缸 gated by the field measurements and questionnaire to the designers ， building managers and occupants ． The reasons are classi 丘ed into three categories ， 1) compla 童 ns of occupants ， 2)control system of natural vent 量 la 廿on ， 3)clear understanding of the natUral ventilation system by building managers and occupants ． It is 丘) und that the ac 加 al use 血 1e of natural ventila 廿on system tends to decrease and that the designers need to keep contact to the building managers and check whether the system run without problem for long dme a 仕er it starts to わe operated ， Sustainable opera 僅 on was discussed in this paper

To increase the adoption and value of solar heat energy, a heat source system was designed and constructed that consists of a large-capacity water thermal storage tank, water source heat pump unit, and waste heat recovery chiller. This heat source system contributes to energy savings and to maintaining the function of a building when infrastructure is unavailable at the time of a disaster. This system was installed in a high school in Tokyo, Japan, and its effectiveness was verified. Actual results indicated that it operates at high efficiency with an average COP of 6.8 and full utilization of solar heat throughout the year. The actual annual usage of solar heat was about 103% that of the simulation at design time. The annual primary energy consumption was reduced by approximately 45% compared to that of an ordinary high school in Japan.

Masatoshi KUBOKI, Eisuke TOGASHI, Tomoaki USHIO and Shin-ichi TANABEIn recent years, commissioning (Cx) is attracting attention as the key process for energy saving during building operation phase. This research is particularly focused on Cx in high energy-consuming building defined by the Law concerning the Rational Use of Energy. For better efficient operation, heat source system simulation is developed and considered about the combination of heating source equipments, cooling water temperature and capacity usage ratio of free cooling. The quantity control is changed when low cooling load arises in transitional season and free cooling utilization increases for the proper setting of chilled water temperature in winter. As this improvement plan is reflected the actual building operation, it can reduce the energy consumption by 219.7 MJ/(m 2 year), running cost by 2,339,000 yen/year and carbon-dioxide emissions by 8.7 kg-CO 2 /(m 2 year), compared to the present heat source system operation. It is shown that the necessary of Cx for global environment conservation in this research. 2005 IEA Annex47CA 74 642 991-999 2009