Modelling refrigerant distribution in microchannel evaporators
Publication: Research - peer-review › Journal article – Annual report year: 2009
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Modelling refrigerant distribution in microchannel evaporators. / Brix, Wiebke; Kærn, Martin Ryhl; Elmegaard, Brian.
In: International Journal of Refrigeration, Vol. 32, No. 7, 2009, p. 1736-1743.Publication: Research - peer-review › Journal article – Annual report year: 2009
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TY - JOUR
T1 - Modelling refrigerant distribution in microchannel evaporators
A1 - Brix,Wiebke
A1 - Kærn,Martin Ryhl
A1 - Elmegaard,Brian
AU - Brix,Wiebke
AU - Kærn,Martin Ryhl
AU - Elmegaard,Brian
PB - Elsevier Ltd.
PY - 2009
Y1 - 2009
N2 - The effects of refrigerant maldistribution in parallel evaporator channels on the heat exchanger performance are investigated numerically. For this purpose a 1D steady state model of refrigerant R134a evaporating in a microchannel tube is built and validated against other evaporator models. A study of the refrigerant distribution is carried out for two channels in parallel and for two different cases. In the first case maldistribution of the inlet quality into the channels is considered, and in the second case a non-uniform airflow on the secondary side is considered. In both cases the total mixed superheat out of the evaporator is kept constant. It is shown that the cooling capacity of the evaporator is reduced significantly, both in the case of unevenly distributed inlet quality and for the case of non-uniform airflow on the outside of the channels.
AB - The effects of refrigerant maldistribution in parallel evaporator channels on the heat exchanger performance are investigated numerically. For this purpose a 1D steady state model of refrigerant R134a evaporating in a microchannel tube is built and validated against other evaporator models. A study of the refrigerant distribution is carried out for two channels in parallel and for two different cases. In the first case maldistribution of the inlet quality into the channels is considered, and in the second case a non-uniform airflow on the secondary side is considered. In both cases the total mixed superheat out of the evaporator is kept constant. It is shown that the cooling capacity of the evaporator is reduced significantly, both in the case of unevenly distributed inlet quality and for the case of non-uniform airflow on the outside of the channels.
U2 - 10.1016/j.ijrefrig.2009.05.006
DO - 10.1016/j.ijrefrig.2009.05.006
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
SN - 0140-7007
IS - 7
VL - 32
SP - 1736
EP - 1743
ER -