Advanced Exergy Assessment of an Air Source Heat Pump Unit

Year 2024, Volume: 13 Issue: 1, 15 - 22, 24.03.2024

Ayşegül Güngör Çelik

https://doi.org/10.17798/bitlisfen.1308933

Abstract

Conventional exergy-based analysis methods are used for evaluating the performance of the energy conversation systems. Conventional exergy-based analyses identify the sources, amounts, and reasons of irreversibilities (exergy destructions), costs and environmental effects, and provide a general direction for improvement. However, interactions between system components (endogenous/exogenous) and technical limitations (avoidable/unavoidable) cannot be identified with any conventional analysis. Hence, the real potential for improvement and optimization strategies can be misguided. Advanced exergy based analysis seeks to overcome this limitation. An air source heat pump unit was assessed applying conventional and advanced exergy analysis approaches respectively. Avoidable/unavoidable and endogenous/exogenous exergy destructions, modified exergy efficiencies and modified exergy losses ratios were calculated for every single component of the system. The results showed that while the evaporator and condenser efficiencies could be upgraded via constructional enhancements to the overall system and other system components, internal operating conditions were mainly responsible of the inefficiencies regarding with the compressor. The analysis demonstrated that while it was possible to improve evaporator and condenser efficiency by making constructive enhancements to whole system design, the efficiency of the compressor was mainly determined by the internal conditions in which the compressor operated.

Keywords

Advance exergy, Heat pump, Exergy.

Supporting Institution

CBÜ BAP

Project Number

2022-056

Thanks

The author would like to thank Manisa Celal Bayar University (BAP) for providing the funding for the research named ‘Design, Construction and Experimental Investigation of an Air Source Heat Pump System with Advanced Exergy Analysis Method (2022-056)'.

References

• [1] Y. Jung, J. Oh, U. Han, H. Lee. “A comprehensive review of thermal potential and heat utilization for water source heat pump systems” Energy and buildings, vol. 266, pp.112-124, 2022.
• [2] I. Dincer, A.Z. Sahin. “A new model for thermodynamic analysis of a drying process” International Journal of Heat and Mass Transfer, vol. 47, pp. 645-652, 2004.
• [3] T. Morosuk, G. Tsatsaronis. “A new approach to the exergy analysis of absorption refrigeration machines” Energy, vol. 33, pp. 890–907, 2008.
• [4] O. Balli. “Advanced exergy analysis to evaluate the performance of a military aircraft turbojet engine (TJE) with afterborner system: Splitting exergy destruction into unavoidable/avoidable and endogeneous/exogenous” Applied Thermal Engineering, vol. 111, pp. 152-169, 2017.
• [5] J. Chen, “Investigation of vapour ejectors in heat driven ejectors refrigeration system,” Ph.D. Thesis, Division of applied thermodynamics and refrigeration department of energy tecnology, Royal Enstitute of technology, KTH , SE-100 44 Stckholm, Sweden, 2014.
• [6] T. Morosuk and G. Tsatsaronis. “A new approach to the exergy analysis of absorption refrigeration machines” Energy, vol. 34, pp. 890–907, 2008.
• [7] G.D. Vuckovic, M.V. Vukic, M.M. Stojiljkovic, D.D Vuckovic. “Avoidable and Unavoidable Exergy Destruction and Exergoeconomic Evaluation of the Thermal Processes in a Real Industrial Plant” Thermal science, vol. 16, Suppl. 2, pp. 433-446, 2012.
• [8] B. Ghorbani, H. Roshani. “Advanced exergy and exergoeconomic analysis of the integrated structure of simultaneous production of NGL recovery and liquefaction” Trans Phenom Nano Micro Scales, vol. 6 (Specials), pp. 8-14, Doi: 0 22111/tpnms, 2018.
• [9] A. Hepbasli and A. Kecebas. “Comparative study on conventional and advanced exergetic analyses of geothermal district heating systems based on actual operational data” Energy and Buildings, vol. 61, pp. 193–201, 2013.
• [10] X. Liu, X. Yan, X. Liu, Z. Liu, W. Zhang. “Comprehensive evaluation of a novel liquid carbon dioxide energy storage system with cold recuperator: Energy, conventional exergy and advanced exergy analysis”, Energy Conversion and Management, vol. 250, 114909, 2021. https://doi.org/10.1016/j.enconman.2021.114909.
• [11] T. Morosuk, G. Tsatsaronis. “Advanced exergy analysis for chemically reacting systems – application to a simple open gas-turbine system” Int J Therm, vol.12, no.3, pp.105–111, 2009.
• [12] A. Bejan, G. Tsatsaronis, and M. Moran, Thermal design and optimization, Wiley, New York., 542 p., 1996
• [13] O. Balli, H. Caliskan. “On-design and off-design operation performance assessments of an aero turboprop engine used on unmanned aerial vehicles (UAVs) in terms of aviation, thermodynamic, environmental and sustainability perspectives” Energy Conversion and Management, Vol. 243, pp. 114403, 2021.
• [14] F. Petrakopoulou, “Comparative evaluation of power plants with Co2 capture: thermodynamic, economic and environmental performance”, Ph. D. dissertion, Berlin Technical University, Berlin, 209 p, 2011.
• [15] T. Morosuk, G. Tsatsaronis, C. Zhang. “Conventional thermodynamic and advanced exergetic analysis of a refrigeration machine using a Voorhees’ compression process” Energy Conversion and Management, vol. 60, pp.143-151, 2012.
• [16] T. Morosuk, G. Tsatsaronis. “Understanding and improving energy conversion processes with the aid of exergy-based methods. 1st 492 International Exergy, Life Cycle Assessment, and Sustainability” Workshop and Symposium (ELCAS), 4-6 June, 2009, Nisyros-Greece.
• [17] S. Kelly, “Energy systems improvement based on endogenous and exogenous exergy destruction”. PhD Thesis, Institut fur Energietechnik, Technische Universtat Berlin, Berlin, Germany, 2008.