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ABSTRACT
In this study, a new design has been developed to increase the thermal performance of a plate heat exchanger. In the developed design, springs are placed on the heat exchanger plates at an angle of 45°. In this study, which aims to improve heat transfer by increasing turbulence, nanoparticles were also used to increase the heat transfer coefficient of the heat transfer fluid. The nanoparticles used are Al2O3 and CuO in three different densities. The performance factor of the system was calculated experimentally with these fluids entering the heat exchanger at six different speeds. The highest performance factor obtained was 1.33, and it was obtained by using 1% mass ratio Al2O3 nanoparticles. The highest value for CuO, the other nanoparticle used, was determined as 1.27. The highest increases in heat transfer are 60.7% and 56.5% for Al2O3 and CuO, respectively.
Nomenclature
| m | = | Mass flow rate (kg/s) |
| T | = | Temperature (K) |
| Re | = | Reynolds number |
| μ | = | Dynamic viscosity (Pa s) |
| h | = | Heat transfer coefficient (W /m2 K) |
| Pr | = | Prandtl number |
| j | = | Colburn factor |
| F | = | Fanning friction factor |
| A | = | Heat transfer area (m2) |
| c | = | Specific heat (j/kgK) |
| G | = | Mass velocity (kg/ m2s) |
| Dh | = | Hydraulic diameter (m) |
| N | = | Number of channels |
| Nu | = | Nusselt number |
| k | = | Thermal conductivity(W/mK) |
| JF | = | Thermal–hydraulic performance factor |
| Subscripts | = | |
| i | = | inlet |
| w | = | water |
| a | = | average |
| p | = | plate |
| n | = | nanofluid |
| o | = | outlet |
| c | = | cold |
| h | = | hot |
Acknowledgments
This study was funded by the TUBITAK ARDEB. The authors would like to express their thanks to TUBITAK for their supports. Additionally, This article was produced from the doctoral thesis named “The Effect of Nanofluid on Heat Transfer in a New Type Plate Heat Exchanger.”
Disclosure statement
No potential conflict of interest was reported by the author(s).