10.15480/882.2448
Subei, Christoph
Christoph
Subei
1197922792
Schmitz, Gerhard
Gerhard
Schmitz
0000-0002-6702-5929
14162552X
Analysis of refrigerant pipe pressure drop of a CO₂ air conditioning unit for vehicles
Elsevier Science
2019
Air conditioning
Piping
Pressure drop
R744
Technik
TUHH Universitätsbibliothek
TUHH Universitätsbibliothek
2019-10-24
2019-10-24
2019-04-22
en
Journal Article
International Journal of Refrigeration (106): 583-591 (2019-10-01)
http://hdl.handle.net/11420/3640
urn:nbn:de:gbv:830-882.053019
10.15480/882.2448
10.1016/j.ijrefrig.2019.04.005
https://creativecommons.org/licenses/by-nc-nd/4.0/
This study investigates the pressure drop in refrigerant pipes of a CO₂ automotive air conditioning unit. A test rig to measure the pressure drop of arbitrarily shaped pipes is presented. As boundary conditions at the inlet of the test section, mass flow, pressure and enthalpy of the refrigerant are independently adjustable to values that cover the whole operating range of a CO₂ automotive air conditioning system for cars in the premium segment. Numerical analysis using CFD and a one-dimensional modelling tool is carried out. The pressure drop for the suction pipe reaches values of up to 500 mbar. CFD simulation predicts the pressure drop with an error of 25.7% for single-phase flow whereas the deviation using one-dimensional models is 46.5%. During two-phase flow the error increases to 55.8% with one-dimensional models and 42.4% using CFD.
0140-7007
International journal of refrigeration
2019
Elsevier Science