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Performance Evaluation of Wire Cloth Micro Heat Exchangers

: Fugmann, H.; Martens, S.; Balzer, R.; Brenner, M.; Schnabel, L.; Mehring, C.

Volltext urn:nbn:de:0011-n-5812301 (13 MByte PDF)
MD5 Fingerprint: a5a94419baacabe27be05e1b93bea032
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Erstellt am: 13.3.2020

Energies 13 (2020), Nr.3, Art. 715, 16 S.
ISSN: 1996-1073
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
Thermische Systeme und Gebäudetechnik; computational fluid dynamics; heat exchanger; heat transfer enhancement; performance figures; wire structure; Energieeffiziente Gebäude; Wärme- und Kälteversorgung; Materialien und Komponenten für Wärmetransformation

The purpose of this study is to validate a thermal-hydraulic simulation model for a new type of heat exchanger for mass, volume, and coolant/refrigerant charge reduction. The new heat exchanger consists of tubes with diameters in the range of 1 m m and wires in the range of 100 m , woven together to form a 200×200× 80 m m 3 wire cloth heat exchanger. Performance of the heat exchanger has been experimentally evaluated using water as inner and air as outer heat transfer medium. A computational thermal and fluid dynamic model has been implemented in OpenFOAM®. The model allows variation of geometry and operating conditions. The validation of the model is based on one single geometry with an opaque fabric and air-side velocities between 1 and 7 m / s . The simulated and measured pressure drops are found to be in good agreement with a relative difference of less than 16%. For the investigated cases, the effective heat transfer coefficients are in very good agreement (less than 5%) when adapting the contact resistance between tubes and wires. The numerical model describes the fluid flow and heat transfer of the tested heat exchanger with adequate precision and can be used for future wire cloth heat exchanger dimensioning for a variety of applications.