A study of the effect of heat source location in a ventilated room using multiple regression analysis

For that paper, a multiple regression analysis is applied to predict the room mean velocity on the one hand and to determine the most influencing parameters on the velocity, on the other hand. For four different heat source locations, more than 120 experiments were carried out in a test chamber. The influence of the environmental parameters were examined by two methods : a simple and a multiple regression analysis . The conclusions are presented.

Field experiments on natural energy utilization in a residential house with a double skin façade system

The double skin façade proves to be an effective system in energy conservation in residential buildings. The temperature distribution, the thermal performance in the double skin space and its impact on air-conditioning load in rooms have been measured. Th

Three-dimensional numerical simulation of a hybrid fresh air and recirculated air diffuser for decoupled ventilation strategy

For that paper, a new ventilation strategy is numerically simulated, this new approach consists in supplying fresh air directly by using high velocity circular air jet without mixing with recirculated air.Different angles of recirculated air diffuser blades, different lengths and directions of protruding fresh air jets are adopted along with different inlet velocities of fresh air to compare the effectiveness and efficiency of that new ventilation strategy numerically.

Bayesian adaptive comfort temperature (BACT) of air-conditioning system in subtropical climate

This study argues that complaints about thermal discomfort by individuals should not be ignored and can be used to determine the temperature setting for a population in air-conditioned environment. Findings of a new notion of Bayesian adaptive comfort temperature (BACT) of air-conditioning system in humid and subtropical climate as in Hong Kong are reported.

Indoor air quality for chemical and ultrafine particle contaminants from printers

For that study, the air contaminations with VOCs, ozone and ultrafine particle were monitored in the indoor air of a room containing either a laser printer or ink-jet printer. The results confirm that an office or residential printer may be a source of indoor air contamination, with VOCs , particles but also ultrafine particles and other contaminants.

Sorption of VOCs on material surfaces as the deciding factor when choosing a ventilation strategy

For that paper, the interaction between different ventilation strategies, and the adsorption and desorption of volatile compounds on material surfaces in small test chambers was investigated. Nylon carpet was exposed in test chamber experiments to a mixture of toluene and a-pinene at two different dosing rates. The results and conclusions are presented.

Dispersion of gas pollutant in a fan-filter-unit (FFU) cleanroom

For that study a numerical simulation and experimental measurement of flow and concentration fields in a working fan-filter-unit (FFU) cleanroom has been conducted. The aim was to find out the unsteady concentration distribution of a leaking gas pollutant.The measured data were compared with the numerical results and the agreement was good.

In search of the comfortable indoor environment : a comparison of the utility of objective and subjective indicators of indoor comfort

Assessing the relative utility of subjective and objective indicators of perceived comfort of indoor environements was the aim of that paper. Physical environmental variables such as temperature, relative humidity and noise level, were measured in a hospital setting and patients and staff rated their perception of the indoor environment. It appeared with regression analyses that the subjective sensory ratings were better than objective indicators for the prediction of the overall rated indoor comfort.

Measurements of indoor thermal environment and energy analysis in a large space building in typical seasons

For that study site-measurements have been carried out in the Shanghai International Gymnastics Stadium. Those measurements included outdoor environment (weather conditions and peripheral hallway), indoor air temperature distribution (occupant zone temperature, radial temperature near upper openings and vertical temperature distributions) and the heat balance of air-conditioning system. The results indicate that according the season, there is a difference in the characteristics on energy saving of upper openings.

Performance evaluation of an innovative fan-coil unit : Low-temperature differential variable air volume FCU

The development of an innovative low temperature differential variable air volume fan-coil unit (LTD-VAV FCU) was carried out to improve the defects of VAV and cold air distribution energy-saving technololgies. The experimental results of the prototype are presented along with the authors conclusions.

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