The heat transfer processes in the heat exchange unit of combined photoenergy system
Previously developed photoenergetic system based on silicon
multijunction solar cells with vertical diode cells or gallium arsenide
solar cells, which has a positioning and control facility,
which increases the amount of light energy that comes to the
surface of photoenergetic system has many advantages. Such
photoenergetic system will produce electricity and heat water, as
well. But significant weaknesses connected with a uniform cooling
of installed solar cells were detected and need a separate solution.
Based on aforesaid, the aim of this work was to make mathematical
modelling of the main parameters of heat transfer block
for such photoenergetic system based on heat transfer general
patterns for forced fluid circulation case.
Using theoretical study it was considered two options of construction:
construction with a large area of the heat exchanger,
and construction that has a large coefficient of heat transfer in
heat exchanger area that is close to heat receiving surface. Based
on carried calculations the basic construction of a flat heat exchanger
has been improved by the insertion of microchannels for
increasing heat transfer coefficient. Heat exchanger block is
designed as a finished unit with implementation turbulent flow in
it, which allows obtaining heat transfer coefficient of
Analysis of the received heat pictures allows concluding that at
the flowing liquid speed 0.3 m/s for the proposed construction of
the heat exchanger sufficient uniformity of cooling surface is
achieved. In this case, the maximum temperature does not exceed
43.5oC, which is sufficient for effective solar cell work without
reducing efficiency. Along with this, flowing liquid speed reducing
leads to loss of cooling uniformity and to significantly increasing
of the surface temperature more than 60oC, which is
Flow analysis confirmed the turbulent regime of the flow, which
gives the maximum possible heat transfer coefficient.
photovoltaic systems. Solar Energy, 2001, Vol. 70, Issue 4,
2. Tuomiranta A., Marpu P., Munawwar S., Ghedira H.
Validation of thermal models for photovoltaic cells under hot
desert climates. Energy Procedia, 2014, Vol. 57, pp. 136-143.
3. Development of the energy picture settings based on
multijunction solar cells with silicon-governmental vertical diode
cells. Report on R & D (final; state registration number
0111U007628) / Director E. Sokol (Kharkov: NTU "KPI", 2012).
4. Strebkov D.S. Matrix solar cells: Monograph in 3 volumes.
Vol. 1 – Moscow, GNU VIESH Publ., 2009, 120 p.
5. Sokol E.I., Kopach V.R., Zaitsev R.V. Physical and
technical features and practical limits of the photonenergy module
of the new generation on the territory of Ukraine. Renewable
energy, 2011, No. 2(25), pp. 18-28.
6. Reddy K.S., Premkumar D., Vikram T.S. Heat Transfer
Modeling and Analysis of Solar Thermo-chemical Reactor for
Hydrogen Production from Water. Energy Procedia, 2014, Vol.
57, pp. 570-579.
7. Steinfeld A. Solar thermochemical production of hydrogen
– a review. Solar Energy, 2005, Vol. 78, Issue 5, pp. 603-615.
8. Modi A., Buhler F., Andreasen J.G., Haglind F. A review
of solar energy based heat and power generation systems.
Renewable and Sustainable Energy Reviews, 2017, Vol. 67, pp.
9. Rezcov V.F., Surzhyk O.M., Ohota O.O. Experimental
study of the thermal conductivity of composite materials solar
collectors. Renewable energy, 2016, No. 2(45), pp. 41-44.
10. Gubin S.V., Gontar M.G. Dynamic simulation of the
operation of the photovoltaic battery with regard to the temperature
change of the panel. Renewable energy, 2016, No. 1(44),
11. Isachenko V.P., Osipov V.A., Sukomel A.S. Heat transfer
– Moscow : Enegroizdat, 1981, 488 p.
12. Kuznecov M.P. Modeling collaboration wind and solar
energy station. Renewable energy, 2016, No. 1(44), pp. 12-16.
13. Kuznecov M.P. Some features of the battery wind and
solar power. Renewable energy, 2016, No. 2(45), pp. 15-21.
14. Mikheyev M.A. Fundamentals of heat transfer – Moscow-
Leningrad: gosenergoizdat, 1960, 208p.
15. Shokri R., Ghaemi S., Nobes D.S., Sanders R.S. Investigation
of particle-laden turbulent pipe flow at high-
Reynolds-number using particle image/tracking velocimetry
(PIV/PTV). International Journal of Multiphase Flow, 2017,
Vol. 89, pp. 136-149.
16. Shirvan K.M., Ellahi R., Mirzakhanlari S., Mamourian
M. Enhancement of heat transfer and heat exchanger effectiveness
in a double pipe heat exchanger filled with porous media: Numerical
simulation and sensitivity analysis of turbulent fluid flow. Applied
Thermal Engineering, 2016, Vol. 109, Part A, pp. 761-774.
This work is licensed under a Creative Commons Attribution 4.0 International License.