A criterial analysis of the effectiveness of air-to-air heat exchangers with periodic change of airflow direction

•The model of the heat exchanger with periodic change in the airflow direction was developed.•The model takes into account the phase transitions on walls of the channel and in a flow.•Eight complexes influencing the efficiency of the heat exchanger were determined.•The properties of polypropylene an...

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Bibliographic Details
Published in:Applied thermal engineering 2018-02, Vol.130, p.1246-1255
Main Authors: Borodulin, V.Yu, Nizovtsev, M.I.
Format: Article
Language:English
Subjects:
Air flow
Heat exchange
Heat exchangers
Humidity
Humidity air
Mathematical models
Matrix methods
Moisture transfer
Parameters
Phase transition
Phase transitions
Regenerative heat exchanger
Regenerative heat exchangers
Sensible and latent efficiency
Studies
Thermophysical properties
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Summary:•The model of the heat exchanger with periodic change in the airflow direction was developed.•The model takes into account the phase transitions on walls of the channel and in a flow.•Eight complexes influencing the efficiency of the heat exchanger were determined.•The properties of polypropylene and cardboard are most suitable for the heat exchanger. The physico-mathematical model of the regenerative heat exchanger with periodic changes of air flow direction has been developed. The model takes into account phase transitions both on the surface of air channels of heat exchange matrix and directly in the airflow. In this paper, the results of the influence of parameter groups on the heat exchanger effectiveness are generalized. Such generalization is reached by identifying the governing dimensionless groups in the system of equations. The analysis using the generalized parameters allows considerably simplifying the study of processes with a large number of parameters. In addition, the influence of air humidity and temperature on the sensible and latent effectiveness of the heat exchanger has been analyzed. Computations enable determining the heat exchange matrix material that is the most suitable in terms of its thermophysical properties.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2017.11.126