Simulation of a New Hybrid Solar and Organic Cycle as a Combined Cooling, Heat and Power (CCHP) Unit in Off Design Condition

Document Type: Research Article

Authors

Mechanical and Energy Engineering Department, Shahid Beheshti University, Tehran, Iran

Abstract

In this paper, using parabolic mirrors, a solar field was designed, which was related to a storage tank for a residential complex in the city of Tafresh located in the center of Iran. The design was performed for the existing oils: VP1, THERMINOL 66, THERMINOL 59. Finally, considering an organic cycle with R123 as working fluid and assuming a minimum length required for oil flow rate to reach a specified temperature, VP1 was selected both as working fluid and for the storage system. Position of single-effect absorption chiller in the outlet of the organic turbine in hot seasons for cooling and also using a condenser in cold seasons due to the lack of need for cooling provide the possibility of selecting two different working pressures in the cycle, which leads to increased storage in winter. The overall performance of solar cycle was calculated with variable electrical demand load of 63%. In off-design condition, on the longest day of the year, the considered cycle was shown to be able to uninterruptedly generate power, cooling, and heating for 20 h for hygienic purposes. Also, it could generate power and heating for 10 h and 50 min on average on the shortest day of the year.

Keywords


Dudley, V.E., Kolb, G.J. and Mahoney, A.R. (1994). Test Results: SEGS LS-2 Solar Collector. SAND94-1884. Albuquerque, NM: SANDIA National Laboratories.

Karellas, S. and Braimakis, K. (2016). Energy–exergy analysis and economic investigation of a cogeneration and trigeneration ORC–VCC hybrid system utilizing biomass fuel and solar power, Energy Conversion and Management, 107: 103–113.

Yağlıa, H., Koça, Y., Koça, A., Görgülüb, A. and Tandiroğlu, A. (2016). Parametric optimization and exergetic analysis comparison of subcritical and supercritical organic Rankine cycle (ORC) for biogas fuelled combined heat and power (CHP) engine exhaust gas waste heat, Energy, 111: 923–932.

Freeman, J., Hellgardt, K. and  Markides, C. N. (2016). Working fluid selection and electrical performance optimization of a domestic solar-ORC combined heat and power system for year-round operation in the UK, Applied Energy. Corrected Proof.

Ungureşan, P.,  Petreuş, D.,  Pocola, A. and  Bălan, M. (2016). Potential of Solar ORC and PV Systems to Provide Electricity under Romanian Climatic Conditions, Energy Procedia, 85: 584-593.

Ameri, M. and Jorjani, M. (2016). Performance assessment and multi-objective optimization of an integrated organic Rankine cycle and multi-effect desalination system Desalination. 392: 34-45.

Mokhtari, H., Ahmadisedigh, H. and Ebrahimi, I. (2016). Comparative 4E analysis for solar desalinated water production by utilizing organic fluid and water, Desalination.  377: 108-122.

El-Dessouky, H. T., Ettouney, H. M. and Mandani, F. (2000). Performance of parallel feed multiple effect evaporation system for seawater desalination. Appl. Thermal Eng., 20: 1679–1706.

Farouk Kothdewila, A., Norton, B. and Eames, P. C. (1995). The effect of variation of angle of inclination on the performance of low concentration ratio compound parabolic solar collector.  Solar Energy, 55: 301-309.

Gnielinski, V. (1976). New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow. International Chemical Engineering, 16: 359–363.

Incropera, F. and DeWitt, D. (1990). Fundamentals of Heat and Mass Transfer, Third Ed. NY: John Wiley and Sons, New York.

Malika, O., Abdallah, K. and Larbi, L. (2013). Estimation of the temperature, heat gain and heat loss by solar parabolic trough collector under Algerian climate using different thermal oils. Energy Conversion and Management, 75: 191–201.

Tao, Y. B. and He, Y. L., (2010). Numerical study on coupled fluid flow and heat transfer process in parabolic trough solar collector tube. Solar Energy 84, 1863–1872.

Touloukian, Y.S. and DeWitt, D.P. (1972). Radiative Properties, Nonmetallic Solids. Thermophysical Properties of Matter, 8, New York, NY: Plenum Publishing.