Kærn, Martin Ryhl1; Elmegaard, Brian1; Larsen, Lars Finn Sloth3
1 Department of Mechanical Engineering, Technical University of Denmark2 Thermal Energy, Department of Mechanical Engineering, Technical University of Denmark3 Danfoss A/S
Flow maldistribution in fin-and tube evaporators for residential air-conditioning is investigated by numerical simulation. In particular, the interlaced and the face split evaporator are compared in flow maldistribution conditions. The considered sources of maldistribution are the liquid/vapor distribution and the airflow distribution. Furthermore, compensation of flow maldistribution by control of individual channel superheat is studied for each evaporator type. It is shown that the interlaced evaporator is better at flow maldistribution than the face split evaporator. However, if individual channel superheats are controlled, the face split evaporator achieves the best performance, i.e. an increase of 7% in overall UA-value and 1.6–2.4% in COP compared to the interlaced evaporator without compensation.
International Journal of Refrigeration, 2013, Vol 36, Issue 1, p. 203-214
Distribution de l'écoulement; Compensation; Conditionnement d'air; Tube aileté; Modélisation; Simulation