Theoretical And Mathematical Analysis Of Double- Circuit Solar Station With Thermo Siphon Circulation

Öz

This article discusses the mathematical models of the individual structures and modes of operation of a double-circuit solar collector with thermo siphon circulation. To perform this task, we considered a new design of a flat solar collector with thermo siphon circulation, in which the heat transfer coefficient was increased by eliminating additional partitions between the panel and thermal insulation. The efficiency of the solar collector is achieved due to the presence of the metering tank and the heat pump in the tank, where the condenser and evaporator are made in the form of a “spiral in a spiral” type heat exchanger, and the heat exchanger pipelines are placed one above the other, which allows increasing the area and intensity of heat exchange. The result of this work is a theoretical and mathematical analysis of the unsteady thermal regime of flat solar collectors on the modes of operation under consideration. Based on the results of the analysis, it is possible to optimize individual structural elements, as well as to predict the thermal regime and select alternative solutions for the design of flat solar collectors and the choice of operating modes.

Anahtar Kelimeler

• Double-circuit solar station,heat pump,solar collector,thermo siphon circulation

Kaynakça

1. [1] J. R. Wixson. Function Analysis and Decomposition Using Function Analysis Systems Technique. International Council on Systems Engineering Annual Conference (INCOSE ’99) June 6, 1999 – June 10, 1999
 [2] Tomas, M.; Vladimir, Z.; Juliane, M. Detailed modeling of solar flat-plate collectors with design tool kolektor 2.2, building simulation. In Eleventh International IBPSA Conference, Glasgow, Scotland; IBPSA: Loughborough, UK, 2009; 2289–2296. [3] Duffie, J.A.; Beckman, W.A. Solar Engineering of Thermal Processes, 2nd ed.; John Wiley & Sons, Inc.: New York, 1980; 23, 73–74, 95–101. [4] Koyuncu, T. Performance of various design of solar air heaters for crop drying applications. Renewable Energy 2006, 31, 1073–1088.
 [5] Kicsiny, R. Improved multiple linear regression based models for solar collectors. Renewable Energy 2016, 91, 224–232.
 [6] Gao, W.; Lin, W.; Liu, T.; Xia, C. Analytical and experimental studies on the thermal performance of cross-corrugated and flat plate solar air heaters. Applied Energy 2007, 84(4), 425–441. [7] Alvarez, A.; Cebaza, O.; Muñiz, M.C.; Varela, L.M. Experimental and numerical investigation of a flat-plate solar collector. Energy 2010, 35, 3707–3716.
 [8] Buzás, J.; Farkas, I.; Biró, A.; Németh, R. Modelling and simulation of a solar thermal system. Mathematics and Computers in Simulation 1998, 48, 33–46. [9] Chow, T.T.; He, W.; Ji, J. Hybrid photovoltaicthermosyphon water heating system for residential application. Solar Energy 2006, 80, 298–306.
 [10] Ji, J.; He, H.; Chow, T.; Pei, G.; He, W.; Liu, K. Distributed dynamic modeling and experimental study of PV evaporator in a PV/T solar-assisted heat pump. International Journal of Heat and Mass Transfer 2009, 52, 1365–1373. [11] Tiwari, A.; Sodha, M.S. Parametric study of various configurations of hybrid PV/thermal air collectors: Experimental validation of theoretical model. Solar Energy Materials and Solar Cells 2007, 91, 17–28.
 [12] Talbot, P.; Lhote, M.; Heilporn, C.; Schubert, A.; Willaert, F.-X.; Haut, B. Ventilated tunnel solar dryers for small-scale farmers communities: Theoretical and practical aspects. Drying Technology 2016, 34, 1162–1174. [13] Duffie, J.A.; Beckman, W.A. Solar Engineering of Thermal Processes; John Wiley Sons: Hoboken, NJ, USA, 1980; Chapter 12, pp. 487–497. [14] Prapas, D.E.; Veliannis, I.; Evangelopoulos, A.; Sotiropoulos, B.A. Large DHW solar systems with distributed storage tanks. Sol. Energy 1995, 35, 175–184. [15] Chang, K.C.; Lin, W.M.; Lee, T.S.; Chung, K.M. Local market of solar water heaters in Taiwan: Review and perspectives. Renew. Sustain. Energy Rev. 2009, 13, 2605–2612. [16] Lin, W.M.; Chang, K.C.; Liu, Y.M.; Chung, K.M. Field surveys of non-residential solar water heating systems in Taiwan. Energies 2012, 5, 258–269. [17] Karagiorgas, M.; Botzios, A.; Tsoutsos, T. Industrial solar thermal applications in Greece economic evaluation, quality requirements and case studies. Renew. Sustain. Energy Rev. 2001, 5, 157–173.