The object of this investigation is a marketplace in a cold winter and hot summer region. This survey provides some basic data for HAVC designing of marketplace and the improvement of existed HAVC system in cold winter and hot summer region, at the same time it is suggested:
1. Due to bad smell caused by fruit and vegetables, it is suitable for supermarket to adopt deterministic directional airflow.

Integration of building components and ventilation systems is an effective way to control thermal loads, especially cooling loads. The key point of the system which has been studied in this paper is a special hollow building slab which allows the penetration of variable ventilation air flows. The ventilation rate may be adjusted following a specific control strategy, in order to activate the thermal mass of the slab, and enhance the free cooling effect in the night time.

There is a worldwide trend to reuse an old building to renovate the historical district forsustainable development. Because of the different construction type and materials, the historical building should be proposed the reuse process via the different strategies. On the other hand, the historical buildings should also provide the healthy indoor environment. A preliminary study already described the methodology of the indoor environment assessment on existing buildings and intends to draft indoorenvironment indicators [1].

A ventilated cavity wall is often proposed in the building envelope design as an alternative to thetraditional wall, mostly due to its ability in reducing the thermal load during the hot season. In order to be recommended as a solution for improving the thermal comfort, a thorough analysis of its performance under all possible scenarios is required. For assessing the thermal performance of the cavity wall, an experimental model has been built and tested at the DECivil of IST.

The maximum velocity in the occupied space is an important aspect of the thermal comfort. The velocity field is controlled by the position of the inlet devices, the introduced momentum flux and the thermal load of a room. Isothermal room air flow velocities depend on the position of the inlet devices and the introduced momentum flux only. Increasing the thermal load of the room leads to a more and more unstable flow situation. Finally, the flow field is dominated by buoyancy effects and it develops a new stable flow structure.

Subjective experiments were conducted during the summer season and the winter season in order toclarify the multiplied effects of humidity and indoor chemical pollutants on subjective comfort and productivity. Lower concentration of formaldehyde was observed at low humidity than at high humidity. Subjects rated the acceptability of air lower at the beginning of the exposure in the environments polluted with formaldehyde. On the other hand, lower humidity caused subjects to rate air quality higher in clean air.

In order to clarify the effects of humidity on subjective comfort and productivity under transient conditions in summer, subjective experiments were conducted. Subjects were exposed to 30C/70%RH for 15 minutes in Chamber 1. Then they moved to Chamber 2, in which 4 different conditions were set, and stayed for 180 minutes. For all 4 conditions, SET* was kept constant at 25.2C. Skin wettedness on left chest and skin moisture on left forearm decreased more at low relative humidity. No significant difference in subjective task performances was found among all conditions.

This paper deals with the study of natural ventilation in a building under tropical climates. Roomair distribution is analyzed with a statistical approach. The building is a cube with two opposing outdoor large openings. The cube is modeled using the RNG k-e model. A dimensionless velocity coefficient for different wind directions is evaluated for each indoor cell of the grid. Cumulative distribution function of this coefficient is calculated at different height to point out the influence of the wind direction.

Subjective experiments were carried out to evaluate thermal comfort of inhomogeneous thermalenvironment created in task area using floor air outlet. Subjects are allowed to control freely the air volume supplied from the floor air outlet and the angle of elevation of the central axis of the air jet discharged from the floor air outlet to get their thermal comfort.

Nevertheless the proven benefit of a cyclist helmet in preventing serious head injuries whena crash occurs, many cyclist still refuse to wear a crash helmet. The main reason for not wearing acyclist helmet is the sensation of discomfort encountered when wearing one. This paper evaluates and analyses - for the first time - both local and global temperature levels and moisture production in order to obtain insight in the interaction between both mechanism, as a response to differences in effort level, air velocity and air temperature, and how to improve its thermal comfort features.