Vol.10, No 2, 2011 pp. 153 - 166
UDC 621.472   517.93   519.6
MATHEMATICAL MODEL AND NUMERICAL SIMULATION OF CPC-2V CONCENTRATING SOLAR COLLECTOR
Velimir Stefanović, Saša Pavlović, Nenad Apostolović
University of Niš, Faculty of Mechanical Engineering, Department for Energetics and Process tehnique, Aleksandra Medvedeva 14, 18000 Niš, Serbia
E-mail: veljas@masfak.ni.ac.rs
Abstract. Physical and mathematical model is presented, as well as numerical procedure for predicting thermal performances of the CPC-2V solar concentrator. The CPC-2V solar collector is designed for the area of middle temperature conversion of solar radiation into heat. The collector has high efficiency and low price. Working fluid is water with laminar flow through a copper pipe surrounded by an evacuated glass layer. Based on the physical model, a mathematical model is introduced, which consists of energy balance equations for four collector components. In this paper water temperatures in flow directions are numerically predicted, as well as temperatures of relevant CPC-2V collector components for various values of input temperatures and mass flow rates of the working fluid, and also for various values of direct sunlight (solar) radiation and for different collector length.
Key Words: thermal, solar radiation, performance, model, dynamic analysis.
MATEMATIČKI MODEL I NUMERIČKI PRORAČUN KONCENTRIŠUĆEG SOLARNOG PRIJEMNIKA CPC-2V
Predstavljeni su fizički i matematički model, kao i numerička procedura za predviđanje termičkih performansi Složenog Paraboličnog Koncentratora CPC-2V. Solarni prijemnik CPC-2V je predviđen za oblast srednjetemperaturne konverzije sunčevog zračenja u toplotu. Prijemnik CPC-2V ima visoki učinak i nisku cenu. Radni fluid (voda) laminarno struji kroz bakarnu cev okruženu evakuisanim staklenim omotačem. Na osnovu fizičkog modela postavljen je matematički model, koga sačinjavaju jednačine bilansa energije za četiri komponente prijemnika. U ovom radu numerički su predviđane promene temperature vode u pravcu strujanja, kao i temperature odgovarajućih komponenti prijemnika CPC-2V za različite vrednosti ulazne temperature i masenog protoka radnog fluida, zatim za različite vrednosti direktnog sunčevog zračenja kao i za različitu dužinu prijemnika.
Ključne reči: solarno zračenje, karakteristike, numerički model, dinamička analiza