Nowadays automobile air conditioning systems normally use R134a as refrigerant. Due to increasing concerns regarding global warming this hydrofluorocarbon (GWP = 1300) seems not to be a long-term solution. In the field of automotive air conditioning CO2 (R744, GWP = 1) is a promising alternative. It is a high-pressure working fluid, which demands new designs of the components, but offers many possibilities, e. g. the use of the AC system for supplementary heating.The importance of simulation tools is increasing in order to reduce time and cost in the developing process. Most of these programs only consider the steady state behavior, but the transient performance is of importance for the simulation of the start-up phase (cool-down or warm-up).Due to the different physical properties of CO2 new models have to be developed. One of the main focuses of the current work is to develop component models for transient simulation. To obtain reliable results, experimental investigations are of essential importance.This paper describes:
Mobile HVAC-System with CO2 as Refrigerant - Simulations and Measurements
Sae Technical Papers
Vehicle Thermal Management Systems Conference & Exposition ; 2005
2005-05-10
Conference paper
English
Mobile HVAC-system with CO2 as refrigerant - simulations and measurements
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