|Title:||Predicting Refrigerant Inventory of HFC 134a in Air Cooled Condensers
|Author(s):||Orth, L.A.; Zeitlow, D.C.; Pederson, C.O.
|Abstract:||Currently, the refrigerant inventory for vapor compression systems is
determined using a costly trial and error procedure. An accurate computer
model of the refrigerant in a system would reduce the time and expense of
this process. This paper presents a computer model that has the capability
to predict the amount of refrigerant in air cooled condensers.
For accurate prediction of refrigerant inventory two important steps are
required. The first step is to model the heat transfer of the coil. This is
needed to separate the three regions of the coil, de superheating,
condensing, and sub cooling and then to further divide the condensing
region into increments of quality.
The second step is to predict the void fraction (ratio of area occupied by
gas to liquid) throughout the condensing region. Void fraction correlations
by Domanski and Didion[ll], Hughmark, Premoli et al., and
Tandon et al.  are included in the model.
The simulation is used to model a cross flow heat exchanger, with parallel
refrigerant paths, used in mobile air conditioning systems. The model is
exercised to illustrate the effects of different operating conditions and void
fraction correlations on the refrigerant inventory in condensers. A
condenser used in mobile air conditioning applications is modeled. Future
work includes experimental validation of the model.
|Publisher:||Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
|Series/Report:||Air Conditioning and Refrigeration Center TR-34
|Sponsor:||Air Conditioning and Refrigeration Center Project 03
|Date Available in IDEALS:||2009-03-13
|Identifier in Online Catalog:||3632454