TY - GEN

T1 - Effect of refrigerant mal-distribution in fin-and-tube evaporators on system performance

A1 - Kærn,Martin Ryhl

A1 - Elmegaard,Brian

A1 - Larsen,Lars Finn Sloth

AU - Kærn,Martin Ryhl

AU - Elmegaard,Brian

AU - Larsen,Lars Finn Sloth

PB - Technical University of Denmark

CY - Kgs. Lyngby

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

KW - Air-conditioning

KW - Evaporator

KW - Modelica

KW - Mal-distribution

KW - Modeling

UR - http://www.scansims.org/

SN - 978-87-89502-88-5

BT - Proceedings of SIMS 50

T2 - Proceedings of SIMS 50

SP - 315

EP - 322

ER -