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Abstract:
A novel algorithm for heat exchanger containing capillaries is
presented by developing and applying a model for choked capillary
with known inlet refrigerant parameter only into the model for
multi-path heat exchanger containing capillaries as well as
introducing auxiliary equations into it to redistribute the
refrigerant mass flow rate when there are capillaries chocked. The
situation of capillaries choked or not during simulation process is
concluded into 3 types of no capillary choked, part capillaries
choked and all capillaries on all paths choked. The model and
algorithm are verified with experimental data. The verification
results show that the deviations for predicting refrigerant flow rate in capillary is less than ±6%, the deviations for predicting heat transfer and pressure drop characteristics of heat exchanger are within ±5% and ±15%, respectively.
Key words: Heat exchanger
Capillary
Simulation
CLC No: TTB657
国家自然科学基金(50576053)和博士点基金(20050248019)资助项目. Received 20060624, received in revised form 20070110
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