Automobile

The paper presents the development of a mathematical model and a simulation tool for the transient prediction of the indoor climate and the heat loads in a car cabin, under real operating conditions. The main objectives were to develop a tool which facilitates, for example, the design of a cabin HVAC system or an on-line control. The model is based on the energy balance between the cabin and the outdoor environment accounting for conduction, convection and shortwave and longwave radiation.

We have sought to accurately quantify automobile HVAC air flow rates in four passenger vehicles,under a range of different ventilation settings and speeds. We used Sulphur Hexafluoride (SF6) as atracer gas, coupled with a portable doser/sampler system to quantify flow rates and leakage.Results of this work indicate a linear increase in HVAC air flow rate with increasing vehicle speed forall vehicles. Older vehicles were much less airtight than newer vehicles, a likely reflection on improveddesign and reduced door seal deterioration observed in the newer vehicles.

This study aims to investigate and clarify the effects of roadside trees and moving automobiles onoutdoor airflow distribution, turbulent diffusion of air pollutants and thermal environment within streetcanyons by means of the results obtained from field measurements in the central part of Sendai city,Japan. The detailed field measurements were carried out in the summer of 2006, at two streets withdifferent densities of roadside trees and traffic volume. The microclimate and NOX concentrations as wellas traffic volume were measured.