Modified CO2-based combined cooling and power cycle with multi-mode and adjustable ability

Abstract To fulfill the diversified demand of power and cooling, the multi-mode combined cooling and power cycle based on CO2 is studied in this research, which can realize full power mode, simultaneous power and refrigeration mode and full refrigeration mode. A two-phase ejector is introduced to ameliorate the configurations of conventional combined cycles. A refrigerated truck is selected as the research objective and two refrigeration conditions are considered. Through the energy and exergy analyses, great improvement in performance and considerable potential in diversified energy supply can achieve by the modified systems. Therein, the modified system with single-stage compression achieves 4.9% improvement of power output and 21.7% improvement of refrigeration output versus the baseline system under refrigeration condition. It can provide extra 15.1 kW power for the objective refrigerated truck after satisfying the refrigeration demand. Besides, the adjustability performance is also discussed in this study, which reveals that the modified system with single-stage compression also possesses the best adjustability performance for its highest cooling to power ratio and the convenient mode transforming and controlling.

[1]  Arif Hepbasli,et al.  Energetic and exergetic comparison of basic and ejector expander refrigeration systems operating under the same external conditions and cooling capacities , 2015 .

[2]  Chenghui Zhang,et al.  Thermodynamic analysis of a novel combined cooling and power system driven by low-grade heat sources , 2018, Energy.

[3]  Jiangfeng Wang,et al.  Thermodynamic and economic analysis and multi-objective optimization of a novel transcritical CO2 Rankine cycle with an ejector driven by low grade heat source , 2018, Energy.

[4]  Yong Wang,et al.  Energy and exergy analysis on gasoline engine based on mapping characteristics experiment , 2013 .

[5]  Qiang Zhang,et al.  Performance assessment and multi-objective optimization of a novel transcritical CO2 trigeneration system for a low-grade heat resource , 2020, Energy Conversion and Management.

[6]  Pei-Xue Jiang,et al.  Particular characteristics of transcritical CO2 refrigeration cycle with an ejector , 2007 .

[7]  S. De,et al.  Ejector based organic flash combined power and refrigeration cycle (EBOFCP&RC) - A scheme for low grade waste heat recovery , 2017 .

[8]  H. Ghaebi,et al.  A novel geothermal combined cooling and power cycle based on the absorption power cycle: Energy, exergy and exergoeconomic analysis , 2018, Energy.

[9]  M. McLinden,et al.  NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 8.0 , 2007 .

[10]  Reinhard Radermacher,et al.  Performance investigation of engine waste heat powered absorption cycle cooling system for shipboard applications , 2015 .

[11]  S. C. Kaushik,et al.  Thermodynamic analysis of a supercritical/transcritical CO2 based waste heat recovery cycle for shipboard power and cooling applications , 2018 .

[12]  R. Llopis,et al.  Subcooling methods for CO2 refrigeration cycles: A review , 2018, International Journal of Refrigeration.

[13]  Jiangfeng Wang,et al.  Thermodynamic analysis and comparison study of two novel combined cooling and power systems with separators using CO2-based mixture for low grade heat source recovery , 2020 .

[14]  Xiao Xiao Xu,et al.  Energy and exergy analyses of a modified combined cooling, heating, and power system using supercritical CO2 , 2015 .

[15]  G. Shu,et al.  Multi-mode analysis of a CO2-based combined refrigeration and power cycle for engine waste heat recovery , 2020 .

[16]  A. Mosaffa,et al.  Ejector based CO2 transcritical combined cooling and power system utilizing waste heat recovery: A thermoeconomic assessment , 2019, Energy Conversion and Management.

[17]  Shuai Deng,et al.  Analysis of a novel combined power and ejector-refrigeration cycle , 2016 .

[18]  J. Keenan,et al.  An Investigation of Ejector Design by Analysis and Experiment , 1950 .

[19]  Jun Li,et al.  Proposal and assessment of a combined cooling and power system based on the regenerative supercritical carbon dioxide Brayton cycle integrated with an absorption refrigeration cycle for engine waste heat recovery , 2020 .

[20]  Xiangguo Xu,et al.  A review of fishing vessel refrigeration systems driven by exhaust heat from engines , 2017 .

[22]  Zeting Yu,et al.  Theoretical study on a novel ammonia–water cogeneration system with adjustable cooling to power ratios , 2014 .

[23]  Chenghui Zhang,et al.  Thermodynamic analysis and multi-objective optimization of a novel power/cooling cogeneration system for low-grade heat sources , 2018, Energy Conversion and Management.

[24]  Agostino Gambarotta,et al.  Internal Combustion Engine (ICE) bottoming with Organic Rankine Cycles (ORCs) , 2010 .

[25]  Yiping Dai,et al.  Exergy analysis, parametric analysis and optimization for a novel combined power and ejector refrigeration cycle , 2009 .

[26]  G. Shu,et al.  A review of modified Organic Rankine cycles (ORCs) for internal combustion engine waste heat recovery (ICE-WHR) , 2018, Renewable and Sustainable Energy Reviews.

[27]  Eckhard A. Groll,et al.  Transcritical CO2 refrigeration cycle with ejector-expansion device , 2005 .

[28]  Sudipta De,et al.  CO2 based power cycle with multi-stage compression and intercooling for low temperature waste heat recovery , 2015 .

[29]  Gequn Shu,et al.  An improved CO2-based transcritical Rankine cycle (CTRC) used for engine waste heat recovery , 2016 .

[30]  Wenge Huang,et al.  Performance analysis and optimization of a combined cooling and power system using low boiling point working fluid driven by engine waste heat , 2019, Energy Conversion and Management.

[31]  Huijuan Chen,et al.  Energetic and exergetic analysis of CO2- and R32-based transcritical Rankine cycles for low-grade heat conversion , 2011 .

[32]  Reinhard Radermacher,et al.  Modeling of waste heat powered energy system for container ships , 2016 .