Modeling the discontinuous individual channel injection into fin-and-tube evaporators for residential air-conditioning
Publication: Research › Article in proceedings – Annual report year: 2012
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Modeling the discontinuous individual channel injection into fin-and-tube evaporators for residential air-conditioning. / Kærn, Martin Ryhl; Elmegaard, Brian.
In: Proceedings of the 9th International Modelica Conference. 2012. p. 713-726.Publication: Research › Article in proceedings – Annual report year: 2012
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TY - GEN
T1 - Modeling the discontinuous individual channel injection into fin-and-tube evaporators for residential air-conditioning
A1 - Kærn,Martin Ryhl
A1 - Elmegaard,Brian
AU - Kærn,Martin Ryhl
AU - Elmegaard,Brian
PY - 2012
Y1 - 2012
N2 - In this paper a working principle based upon the novel expansion and distributor device EcoFlowTM is analyzed.<br/>The device enables compensation of flow maldistribution by control of individual channel superheat.<br/>The working principle is discontinuous liquid injection (pulsating flow) into each individual channels during a<br/>specified cycle time. Moreover, the influence of the injection cycle time is investigated together with an optional<br/>secondary flow into the other channels with regards to cooling capacity, overall UA-value and COP.<br/>The results showed spurious fluctuations in pressure when simulating the pulsating flow, thus the dynamic<br/>behavior in the mixture two-phase flow model is insufficient to model the discontinuous liquid injection<br/>principle. Despite, the fluctuations and imperfections of the model we found that the cycle time should be<br/>kept as low as possible and that the optional secondary flow increases performance. Moreover, the paper reports<br/>on the applicability of Modelica developed models to analyze and optimize the working principle and<br/>design of expansion devices such that Modelica may be used in future development of novel discontinuous<br/>expansion devices.
AB - In this paper a working principle based upon the novel expansion and distributor device EcoFlowTM is analyzed.<br/>The device enables compensation of flow maldistribution by control of individual channel superheat.<br/>The working principle is discontinuous liquid injection (pulsating flow) into each individual channels during a<br/>specified cycle time. Moreover, the influence of the injection cycle time is investigated together with an optional<br/>secondary flow into the other channels with regards to cooling capacity, overall UA-value and COP.<br/>The results showed spurious fluctuations in pressure when simulating the pulsating flow, thus the dynamic<br/>behavior in the mixture two-phase flow model is insufficient to model the discontinuous liquid injection<br/>principle. Despite, the fluctuations and imperfections of the model we found that the cycle time should be<br/>kept as low as possible and that the optional secondary flow increases performance. Moreover, the paper reports<br/>on the applicability of Modelica developed models to analyze and optimize the working principle and<br/>design of expansion devices such that Modelica may be used in future development of novel discontinuous<br/>expansion devices.
KW - Refrigeration
KW - Air-conditioning
KW - Evaporator
KW - Two-phase flow
KW - Liquid injection
KW - Pulsation
KW - Transiemt
KW - Dynamic
KW - Modeling
KW - Simulation
KW - Modelica
U2 - 10.3384/ecp12076713
DO - 10.3384/ecp12076713
BT - Proceedings of the 9th International Modelica Conference
T2 - Proceedings of the 9th International Modelica Conference
SP - 713
EP - 726
ER -