Thermodynamic Analysis of Combined Power and Cooling Cycle

Öz

In this study, thermodynamic analysis of the combined power and cooling cycle, which simultaneously provide power and cooling, was performed. In the cycle, which is a combination of absorption cooling cycle and Rankine power cycle, ammonia-water mixture with variable temperature feature during the boiling and condensation process was used as the working fluid. The effects of turbine inlet pressure and boiler temperature on net work and system efficiency were examined for certain cooling loads. And the pressure ranges in which the system could produce net work were determined. According to the results obtained, the ratio of net work to cooling load at 120 110 and 100 oC boiler temperatures are 4.696, 4.088 and 2.978, respectively.

Anahtar Kelimeler

• Combined cycle
• Cooling
• Power production

Bileşik Güç ve Soğutma Çevriminin Termodinamik Analizi

Öz

Bu çalışmada aynı anda güç ve soğutma elde edilebilen bileşik güç ve soğutma çevriminin termodinamik analizi yapılmıştır. Absorbsiyonlu soğutma çevrimi ile Rankine güç çevriminin birleşimi olan çevrimde çalışma akışkanı olarak kaynama ve yoğuşma sürecinde değişken sıcaklık özelliğine sahip amonyak –su karışımı kullanılmıştır. Türbin giriş basıncı ve boyler sıcaklığının net iş ve sistem verimi üzerindeki etkileri belirli soğutma yükleri için incelenmiş ve sistemin net iş üretebildiği basınç aralıkları belirlenmiştir. Net işin soğutma yüküne oranları 120, 110 ve 100 oC boyler sıcaklıklarında sırasıyla 4.696, 4.088 ve 2.978 olarak bulunmuştur.

Anahtar Kelimeler

• Birleşik çevrim
• Güç üretimi
• Soğutma

Kaynakça

1. [1] Kim KH, Han CH, Kim K. (2012). Effects of ammonia concentration on the thermodynamic performances of ammonia–water based power cycles, Thermochimica Acta, 530, 7– 16.
2. [2] Kumar U, Karimi MN, Asjad M. (2016). Parametric optimisation of the organic Rankine cycle for power generation from low-grade waste heat, International Journal of Sustainable Energy, 35(8), 774–792. http://dx.doi.org/10.1080/14786451.2014.950962
3. [3] Dejfors C, Svedberg G. (1999). Second Law Analysis of Ammonia-Water Power Cycle for Direct-Fired Cogeneration Application, Int. J. Applied Thermodynamics, 2(3), 125-131.
4. [4] Maloney JD, Robertson RC. (1953). Thermodynamic study of ammonia–water heat power cycles, Oak Ridge National Laboratory Report, CF-53-8-43.
5. [5] Kalina AI. (1984). Combined cycle system with novel bottoming cycle, Journal of Engineering for Gas Turbines and Power, 106(4), 737-742.
6. [6] Goswami DY. (1996). Solar thermal power technology: Present status and ideas for the future, Energy Sources Journal, 20,137–45.
7. [7] Xu F, Goswami DY, Bhagwat SS. (2000). A Combined Power/Cooling Cycle, Energy, 25, 233–246.
8. [8] Lu S, Goswami DY. (2003). Optimization of a novel combined power/refrigeration thermodynamic cycle, Journal of Solar Energy Engineering, 125(2),212–217.

9. [9] Padilla RV, Demirkaya G, Goswami DY, Stefanakos E, Rahman MM. (2010). Analysis of power and cooling cogeneration using ammonia-water mixture, Energy, 35, 4649-57.
10. [10] Goswami DY, Xu F. (1999). Analysis of a new thermodynamic cycle for combined power and cooling using low and mid temperature solar collectors, Journal of Solar Energy Engineering, 121,91–7.
11. [11] Yılmam, T. Bileşik güç ve soğutma sistemlerinin enerji ve ekserji analizi kullanılarak incelenmesi,(2019). Yüksek Lisans Tezi, Namık Kemal Üniversitesi Fen Bilimleri Enstitüsü. Tekirdağ.
12. [12] Demirkaya G, Padilla RV, Goswami DY, Stefanakos E, Rahman MM. (2011). Analysis of a combined power and cooling cycle for low-grade heat sources. International Journal of Energy Research, 35, 1145-57.
13. [13] Zare V, Mahmoudi SMS, Yari M, Amidpour M. (2012). Thermoeconomic analysis and optimization of an ammonia–water power/cooling cogeneration cycle, Energy, 47(1), 271–83.
14. [14] Vijayaraghavang S, Goswami DY. (2003) On evaluation efficiency of a combined power and cooling cycle, Journal of Energy Resources Technology, 125, 221–7.
15. [15] Sadrameli SM, Goswami DY. (2007). Optimum operating conditions for a combined power and cooling thermodynamic cycle, Applied Energy, 84(3), 254–65.
16. [16] Martin C, Goswami DY. (2006). Effectiveness of cooling production with a combined power and cooling thermodynamic cycle, Applied Thermal Engineering, 26 (5–6), 576–82.
17. [17] Vijayaraghavan S, Goswami DY. (2006). A combined power and cooling cycle modified to improve resource utilization efficiency using a distillation stage, Energy, 31(8–9),177–96.