Modeling of Finned-Tube Evaporator using Pure and Zeotropic Blend Refrigerants

Abstract

The present research represents a mathematical model applied for a louvered finned tube evaporator. The steady state experimental data of a window type (2) ton of refrigeration air conditioning unit was used to build a tube by tube model to investigate the evaporator performance. The refrigerants selected for this object were R-22 and the zeotropic blends R-407C and R-407A refrigerants. The validation of the present model for pure and mixtures showed good agreement between experimental and those predicted values. The maximum scatter between experimental and predicted evaporator duty was within (-7 to 1) % for all of the simulated refrigerants. The predicted evaporator exit air temperature showed a higher scatter. They were within (-25 to +12) % for all of the simulated refrigerants for the ambient dry bulb temperature range of (28 – 38) .