Expansion Devices for R-744 MAC Units

2005-01-2041

05/10/2005

Event
Vehicle Thermal Management Systems Conference & Exposition
Authors Abstract
Content
In mobile R-744 A/C units mechanical expansion devices (e.g. orifice tubes) or electronic valves (e.g. PWM-valves) can be used. Besides the costs, aspects like coefficient of performance (COP), cooling capacity or control behavior - especially for extreme conditions - influence the choice of the valve type. This paper will present a comparison between an ideal electronic valve and a two stage mechanical orifice tube under full load and part load conditions. The influence of the expansion valve on COP and cooling capacity in different ambient conditions can be sufficiently described with steady-state simulations. The simulation tools used for this work are based on Modelica/Dymola. The simulation results show that for European climate conditions the use of two-stage orifices might increase fuel consumption.
Meta TagsDetails
DOI
https://doi.org/10.4271/2005-01-2041
Pages
8
Citation
Lemke, N., Tegethoff, W., Köhler, J., and Horstmann, P., "Expansion Devices for R-744 MAC Units," SAE Technical Paper 2005-01-2041, 2005, https://doi.org/10.4271/2005-01-2041.
Additional Details
Publisher
Published
May 10, 2005
Product Code
2005-01-2041
Content Type
Technical Paper
Language
English