Comparative Study on Solar Collector’s Configuration for an Ejector-Refrigeration Cycle
AbstractSolar collector’s configuration plays important role on solar-powered refrigeration systems to work as heat source for generator . Three types of solar collector consisting of flat plate, evacuated tube, and compound parabolic solar collectors are compared to investigate their performances. The performances consist of the behavior of heat which can be absorbed by the collectors, heat loss from the collectors and outlet temperature of working fluid at several slopes of the solar collectors. The new accurate analysis method of heat transfer is conducted to predict the performance of the solar collectors. The analysis is based on several assumptions, i.e. sky condition at Bandung is clear and not raining from 08.00 until 17.00 and thermal resistance at cover and absorber plate is negligible. The numerical calculation results confirm that performance of the evacuated tubes solar collector at the same operating conditions is higher than the others. For the case of an evacuated-tubes solar collector system with aperture area of 3.5 m2, the maximum heat which can be absorbed is 3992 W for the highest solar intensity of 970 W/m2 at 12.00 with horizontal position of the solar collector. At this condition, the highest outlet temperature of water is 347.15 K with mass flow rate 0.02 kg/s and inlet temperature 298 K.
Chan, S., Sato, H., Suwono, A., Astina, I M., & Darmanto, P. S., Ejectorbased Refrigeration Cycle Using HCs as the Working Fluid, 8th IIR Gustav Lorentzen Conference on Natural Working Fluids, Copenhagen, 2008.
Pridasawas, W., Solar-Driven Refrigeration Systems with Focus on the Ejector Cycle, Doctoral Thesis, Royal Institute of Technology KTH, Stockholm, 2006.
Pilatowsky, I., Rivera, W., & Romero, J. R., Performance Evaluation of a Monomethylamine-Water Solar Absorption Refrigeration System for Milk Cooling Purposes, Applied Thermal Engineering, 24(7), 1103-1115, 2004.
Koo, J. M., Development of a Flat Plate Solar Collector Design Program, Master Thesis, Wisconsin University, USA, 1999.
Riffat, S. B., Doherty, P. S., & Abdel, A. E. I., Performance testing of different types of liquid flat plate collectors, Int. Journal of Energy Research, 24, Nottingham University, UK, 2000.
Riffart, S. B., Zhao, X., & Doherty, P. S., Developing a Theoretical Model to Investigate Thermal Performance of a Thin Membrane HeatPipe Solar Collector, Applied Thermal Engineering, 25, 899-915, 2005.
Duffie, J. A & Beckman, W. A., Solar Engineering of Thermal Processes, 2nd Edition, John Wiley & Sons, New York, 1991.
Lemmon, E. W., Jacobsen, R. T., Penoncello, S. G., & Friend, D. G., Thermodynamic Properties of Air and Mixtures of Nitrogen, Argon, and Oxygen From 60 to 2000 K at Pressures to 2000 MPa, Physical Chemical Ref. Data, 29(3), 331-362, 2000.
Lemmon, E. W., Huber, M.L., & McLinden, M. O., Thermodynamic and Transport Properties of Refrigerants and Refrigerant mixture (REFPROP), NIST Standard Reference Database 23 Ver. 8.0, 2007.
Ierardi, J. A., A Computer Model of Fire Spread from Engine to Passenger Compartments in Post-Collision Vehicles, Master thesis, Worcester Polytechnic Institute, 1999.
Agus Hermana, Pengembangan Metode Simulasi untuk Perancangan dan Prediksi Performansi Sistem Pengkondisian Udara Energi Surya, Doctoral Dissertation, Institut Teknologi Bandung, 2006.
Selvaraju, A. & Mani, A., Analysis of an Ejector with Environment Friendly Refrigerants, Applied Thermal Engineering, 24, 827-838, 2004.
Summers, D. A., Thermal Simulation and Economic Assessment of Unglazed Transpired Collector Systems, Master Thesis, Wisconsin University, USA, 1995.
Khalifa, A. M. A., Taha, M. M. A., & Akyurt, M., Design, Simulation, and Testing of a New Concentrating Type Solar Cooker, Solar Energy, 38(2), 79-88, 1987.
Souka, F. A. & Safwat, H. H., Optimum Orientations for the Double Exposure Flat-Plate Collector and Its Reflector, Solar Energy, 10(4), 170-174, 1966.
Harding, G. L. & Zhiqiang, Y., Thermosyphon Circulating In Solar Water Heaters Incorporating Evacuated Tubular Collectors and a Novel Water-In-Glass Manifold, Solar Energy, 34(1), 13-18, 1985.
Mertens, H. & Polman, A., Depth-Resolved Nanostructure and Refractive Index of Borosilicate Glass Doped with Ag Nanocrystals, Optical Materials, 29, 326-331, 2006.
Zhang, J. X. & Wang, Z. R., A New Combined Adsorption-Ejector Refrigeration and Heating Hybrid System Powered by Solar Energy, Applied Thermal Engineering, 22(11), 1245-1258, 2002.
Hollands, K. G. T., Unny, T. E., Raithby, G. D., & Lonicek, L., Free Convection Heat Transfer Across Inclined Air Layers, Transactions of ASME Journal of Heat Transfer, 98, 189-201, 1976.
Lunde, P. J., Solar Thermal Engineering, Space Heating and Hot Water Systems, John Wiley & Sons, New York, 1980.
Soin, R. S., Raghuraman, S., & Murali, V., Two-Phase Water Heater: Model and Long Term Performance, Solar Energy, 38(2), 105-112, 1987.
Yiqin, Y., Hollands, K. G. T., & Brunger, A. P., Measured Top Heat Loss Coefficients for Flat Plate Collectors with Inner Teflon Covers, Proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, August 19-23, 1200-1210, 1991.