Integrated Sustainable Building Design
Today’s customers often require the vehicle manufacturer to document passenger compartment heating for specific test conditions. Without correct selection and sizing of the HVAC system for the passenger compartment, thermal comfort cannot be ensured. One of the aims that the manufacturers of modern vehicles have in mind is the development of new and optimization of the existing systems for achieving and maintaining thermal comfort in the passenger area. The selection of system components to achieve the required thermal comfort in the passenger compartment is the first step. The second step consists on the optimization of the selected thermal comfort control concept of the passenger compartment under various environmental conditions. For the computerized evaluation of thermal comfort at selected standing place, the 4 following measurement variables are used: air speed, humidity, air temperature and the temperature of the black ball. In addition to the prediction of percentage of unsatisfied persons during the heat up phase of the vehicle passenger compartment, the special thermal conditions in the vehicle are pointed out. Within the scope of the work the thermal comfort of the inhomogeneous is compared with the homogeneous environment. Using the operational and the equivalent temperature according to SAE J2234 the homogeneous environments are determined. The following external conditions are constant; incident-flow velocity of the vehicle, air temperature and humidity. The aim of the paper is to indicate a complexity of determining the thermal comfort conditions in passenger vehicles.