Tests air change rate in rooms with windows opening using the tracer gas method.

Presents some hot research topics and their development, including pressure difference control, setting of surge chamber and spray chamber, air change rate and energy saving, numerical simulation of air distribution, and air filter and its leak detecting.

The influences of four different terminals on the indoor air change rate are also compared by taking a project for example.

Indoor thermal environment are affected by heating mode and air exchange rate intensively.

Air infiltration loss depends on air exchange rate.

Influence of different combinations of air changes and cooling load in isolation wards and buffer rooms on temperature difference and isolation coefficient;

Based on a contamination emission model, analyses the influences of indoor temperature, mass transfer coefficient and air changes on contamination emission from porous materials.

Considering passengers travel psychoanalysis,the public traffic model of optimum route is proposed,which goal is minimal transfer times.

The paper presents two optimal trip path mod-els of bus passengers,aiming to the leas"ttransfer times" and the shortes"ttrip time"respectively,thus gets different optimal trip paths for bus passengers to choose their suitable trip paths.

The ventilation rate is analyzed under this new flow pattern, the feasibility and economy of the appliance of this new flow pattern is also discussed.

For an office room in Ji′nan,the changing rule of natuml room temperature with different ventilation rates,envelope and towards were discussed.