Conference paper
Effect of refrigerant mal-distribution in fin-and-tube evaporators on system performance
Refrigerant mal-distribution in fin-and-tube evaporators for residential air-conditioning (RAC) is investigated numerically in this paper. A model of the system is developed in the object-oriented modeling language Modelica. Themodels of the compressor and expansion valve are static, whereas the condenser is a dynamic moving boundary model.
The evaporator model is a dynamic distributed one-dimensional homogeneous equilibrium model, in order to capture the distribution phenomena. Fin-and-tube heat exchangers usually have a complex circuitry, however the evaporator will be simplified to be two straight tubes. The refrigerant mal-distribution is then induced to the evaporator by varying the vapor quality at the inlet to each feeder tube, the pressure drop through each feeder tube and the air-flow across each tube.
Finally it is shown that air-flow mal-distribution can be compensated by an intelligent distributor, that ensures equal superheat in both tubes. The refrigerant is R410a.
Language: | English |
---|---|
Publisher: | Technical University of Denmark |
Year: | 2009 |
Pages: | 315-322 |
Proceedings: | 50th International Conference of Scandinavian Simulation Society |
Journal subtitle: | Modeling of Energy Technology |
ISBN: | 8789502884 and 9788789502885 |
Types: | Conference paper |
ORCIDs: | Kærn, Martin Ryhl and Elmegaard, Brian |