DOI: https://doi.org/10.15587/1729-4061.2018.120546

### Advantages of using channels with different corrugation height in the plate heat exchangers

#### Abstract

In the case when there is a difference in consumption on the side of the cold and hot heat carriers, the use of channels with the same corrugation height in one heat exchanger leads to a decrease in velocity of the heat carrier on the side with low consumption.

Low velocity contributes to appearance of deposits on the heat transfer surface, which leads to disruption of operation mode of the apparatus and a forced clean-up stop. In case of using channels with a different corrugation height (cross-section area), velocities in the channels are aligned and intensity of emergence and growth of contamination falls sharply. It also allows us to reduce the heat transfer surface area of the apparatus and fully implement permissible pressure losses on the sides of the heat exchanger. For designing of heat exchangers of this structure, the authors developed the mathematical model that allows making calculations of heat exchangers for assigned operation conditions with the use of geometrical data of the plates, thermophysical properties of heat carriers and criterial equations for plates of the selected type.

The calculation algorithm involves determining of the ratio between corrugation heights. Practical value lies in the fact that the proposed approach makes it possible to extend the service life of the heat exchanger prior to a maintenance stop. This enables provision of continuity of the technological process and decreases operation costs. Calculation of the heat exchanger of hot water supply by the parallel scheme of attachment to heating networks and the heat exchanger of stage 1 of the two-stage hybrid scheme was presented. Calculation data indicate a decrease in the heat transfer surface area compared to heat exchangers with channels of equal height, full realization of pressure losses and their alignment in the channels, which facilitates an increase in resistance to contamination of the plates’ surface.

Calculation showed the advantage of using apparatuses with channels of different cross-section area. The higher the ratio between consumption of heat carriers in the channels, the stronger this advantage.

#### Keywords

plate heat exchangers; corrugation height; heat transfer analysis; resistance to contamination; hot water supply

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#### References

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Klemes, J., Arsenyeva, O., Kapustenko, P., Tovazhnyanskyy, L. (2015). Compact Heat Exchangers for Energy Transfer Intensification. CRC Press, Boca Raton, 372. doi: 10.1201/b18862

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Gajanan, S. D., Premkumar, S. D., Sreedhara, B. R., Sastry, R. C. (2016). Optimization of channel spacing for the heat transfer performance of corrugated plate heat exchangers. International Research Journal of Engineering and Technology (IRJET), 3 (3), 906–911.

Pandey, S. D., Nema, V. K. (2011). Experimental investigation of heat transfer and friction factor in a corrugated plate heat exchanger. International Jjurnal of Energy and environment, 2, 287–296.

Zimmerer, C., Gschwind, P., Gaiser, G., Kottke, V. (2002). Comparison of heat and mass transfer in different heat exchanger geometries with corrugated walls. Experimental Thermal and Fluid Science, 26 (2-4), 269–273. doi: 10.1016/s0894-1777(02)00136-x

Ciofalo, M., Di Piazza, I., Stasiek, J. A. (2000). Investigation of flow and heat transfer in corrugated-undulated plate heat exchangers. Heat and Mass Transfer, 36 (5), 449–462. doi: 10.1007/s002310000106

Stasiek, J. A. (1998). Experimental studies of heat transfer and fluid flow across corrugated-undulated heat exchanger surfaces. International Journal of Heat and Mass Transfer, 41 (6-7), 899–914. doi: 10.1016/s0017-9310(97)00168-3

Tovazshnyansky, L. L., Kapustenko, P. A., Khavin, G. L., Arsenyeva, O. P.; Khavin, G. L. (Ed.) (2007). Plate Heat Exchangers in heat supply. Kharkiv: NTU KhPI.

Arsenyeva, O. P., Tovazhnyansky, L. L., Kapustenko, P. O., Khavin, G. L. (2011). Optimal design of plate-and-frame heat exchangers for efficient heat recovery in process industries. Energy, 36 (8), 4588–4598. doi: 10.1016/j.energy.2011.03.022

#### GOST Style Citations

Funke. UXP gasketed heat exchangers. «Off-Set» channels. URL: http://www.funke.de (last accessed: 04.11.2017).

Compact Heat Exchangers for Energy Transfer Intensification / Klemes J., Arsenyeva O., Kapustenko P., Tovazhnyanskyy L. CRC Press, Boca Raton, 2015. 372 p. doi: 10.1201/b18862

Wang, L., Sunden B., Manglik R. M. PHEs. Design, Applications and Performance. WIT Press, Southhampton, UK, 2007. 288 p.

Martin H. A theoretical approach to predict the performance of chevron-type plate heat exchangers // Chemical Engineering and Processing: Process Intensification. 1996. Vol. 35, Issue 4. P. 301–310. doi: 10.1016/0255-2701(95)04129-x

CFD applications in various heat exchangers design: A review / Aslam Bhutta M. M., Hayat N., Bashir M. H., Khan A. R., Ahmad K. N., Khan S. // Applied Thermal Engineering. 2012. Vol. 32. P. 1–12. doi: 10.1016/j.applthermaleng.2011.09.001

Lin J. H., Huang C. Y., Su C. C. Dimensional analysis for the heat transfer characteristics in the corrugated channels of plate heat exchangers // International Communications in Heat and Mass Transfer. 2007. Vol. 34, Issue 3. P. 304–312. doi: 10.1016/j.icheatmasstransfer.2006.12.002

Optimization of channel spacing for the heat transfer performance of corrugated plate heat exchangers / Gajanan S. D., Premkumar S. D., Sreedhara B. R., Sastry R. C. // International Research Journal of Engineering and Technology (IRJET). 2016. Vol. 3, Issue 3. P. 906–911.

Pandey S. D., Nema V. K. Experimental investigation of heat transfer and friction factor in a corrugated plate heat exchanger // International Jjurnal of Energy and environment. 2011. Issue 2. P. 287–296.

Comparison of heat and mass transfer in different heat exchanger geometries with corrugated walls / Zimmerer C., Gschwind P., Gaiser G., Kottke V. // Experimental Thermal and Fluid Science. 2002. Vol. 26, Issue 2-4. P. 269–273. doi: 10.1016/s0894-1777(02)00136-x

Ciofalo M., Di Piazza I., Stasiek J. A. Investigation of flow and heat transfer in corrugated-undulated plate heat exchangers // Heat and Mass Transfer. 2000. Vol. 36, Issue 5. P. 449–462. doi: 10.1007/s002310000106

Stasiek J. A. Experimental studies of heat transfer and fluid flow across corrugated-undulated heat exchanger surfaces // International Journal of Heat and Mass Transfer. 1998. Vol. 41, Issue 6-7. P. 899–914. doi: 10.1016/s0017-9310(97)00168-3

Plate Heat Exchangers in heat supply / Tovazshnyansky L. L., Kapustenko P. A., Khavin G. L., Arsenyeva O. P.; Khavin G. L. (Ed.). Kharkiv: NTU KhPI, 2007.

Optimal design of plate-and-frame heat exchangers for efficient heat recovery in process industries / Arsenyeva O. P., Tovazhnyansky L. L., Kapustenko P. O., Khavin G. L. // Energy. 2011. Vol. 36, Issue 8. P. 4588–4598. doi: 10.1016/j.energy.2011.03.022