Initial investigations of coil heat exchanger utilizing waste heat from air conditioning system

In this paper the selected results of testing of tube coil heat exchanger have been presented. The investigated heat exchanger is designed to preheating domestic warm water with the use of waste heat from air conditioning system. The tested device consists of finned tube coil heat exchanger immersed in the thermal storage tank. The tank is equipped with three heating coils and the cylindrical-shaped temperature stratification system. Two coils use water as a heating medium. The third, double-wall heat exchanger coil is filled with the refrigerant from the air conditioning system. The industrial stand enables the experimental investigations of thermal and flow characteristics of the exchanger. In the paper the authors present the technological scheme of the test stand, specification of components of the stand, research possibilities and the exemplary results of characteristic temperature and pressure measurements.

Full text (pdf)

1. Genić S.B., Jaćimović B.M., Jarić M.S., Budimir N. J., Dobrnjac M. M.: Research on the shell-side thermal performances of heat exchangers with helical tube coils, Int. J. Heat Mass Transfer, 55 (2012 4295-4300.
2. Logie W.:  Immersed Coil Heat Exchangers, Solartechnik Prüfung Forschung, 22 (2007) 1-11.
3. Prabhanjan D.G., Raghavan G.S. V., Rennie T.J.: Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger, Int. Comm. Heat Mass Transfer, 29 (2002) 185-191.
4. Smusz R., Wilk J.: Coil heat exchanger with the nanofluid filled buffer layer, Appl. Mech. Materials, 831 (2016) 223-231.
5. Smusz R, Wilk J.: Modeling of heat transfer processes in filled with nanofluid the buffer layer of coil heat exchanger, J. Power Technologies, 20 (2016) in the process of publishing.
6. Zachár A.: Analysis of coiled-tube heat exchangers to improve heat transfer rate with spirally corrugated wall, Int. J. Heat Mass Transfer, 53 (2010) 3928-3939.