This article presents new trends in the area of automobile air conditioning, which is fast becoming standard equipment. Attention is focused on the refrigerant and ventilation circuit of the air conditioning equipment, and on the control system. An analysis is presented here of a commonly used contemporary refrigeration system working with the refrigerant R134a and a promising transcritical refrigeration system using CO 2 as a refrigerant. The article also deals with the configuration of some components of a transcritical refrigeration system. Additionally, attention is paid to physiologically controlled air conditioning and multizone air conditioning systems which make it possible for every individual in the automobile cabin to have an optimum microclimate.

No abstract

The basis for room air distribution solutions in ventilating and air conditioning rooms is the calculation of velocities in air jets from supply outlets. To calculate velocities, the C-value of the air outlets must be known. The aim of this contribution is to acquaint readers with a non-traditional method for defining the Cvalue of an outlet from the angle of air jet expansion in the main jet zone, determined using interferometric visualization of the jet. The principles of interferometric measurements in transparent environments are demonstrated, along with their evaluation via special software developed for evaluating recorded interferograms. The C-value of slot and rectangular outlets is determined using the method introduced here. Results demonstrate the high precision of the method, and that the C-values of outlets can be defined effectively from the visualization records.

No abstract

No abstract