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06 eurammon natural refrigeration award 2017_peng gao_f3

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Natural Refrigeration Award 2017_Peng Gao

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06 eurammon natural refrigeration award 2017_peng gao_f3

  1. 1. eurammon Symposium 2017 An exhaust waste heat-driven sorption freezing system for a refrigerated truck SPEAKER: PENG GAO; LIWEI WANG; RUZHU WANG SHANGHAI JIAO TONG UNIVERSITY, SHANGHAI, CHINA Schaffhausen, 22nd/23rd June, 2017
  2. 2. Schaffhausen, 22nd / 23rd June, 2017 Page 2 Contents 1.Background 2. Sorption freezing system for refrigerated trucks 3.Test the experimental system in the lab 4.Test the experimental system on the truck 5.Conclusions
  3. 3. Schaffhausen, 22nd / 23rd June, 2017 Page 3 • Refrigerated trucks are mainly used to carry fresh, frozen and perishable foods • Main refrigerating method:Mechanical vapor compression refrigeration • Compressors are driven by engines • Reduce the engine power • 1.8 kW refrigerating capacity:  2.6 kW engine power • Increase exhaust emission • 1.8 kW refrigerating capacity:  0.846 L/h fuel oil  2.16 kg/h CO2 emission Engine exhaust gas has a relatively high temperature (200-500oC) and lots of heat (30% of fuel combustion heat) 1.Background
  4. 4. Schaffhausen, 22nd / 23rd June, 2017 Page 4 Waste Heat Sorption refrigeration cycle Refrigerating capacity A novel solid sorption freezing cycle is proposed for refrigerated trucks. Adsorption air-conditioner is developed for the locomotive driver-cabin. Previous most investigation about the sorption refrigeration cycle for the vehicle focused on the refrigerating temperature above 5oC. Required refrigerating temperature of refrigerated trucks: -18 to 0oC NOT USE 1.Background
  5. 5. Schaffhausen, 22nd / 23rd June, 2017 Page 5 Critical operating conditions Low load: 200-250oC Full load: 400-500oC Low heat transfer coefficient In summer, temperature ≥30oC Such critical operating conditions,the single stage sorption freezing cycle is difficult to meet requirements. A novel two-stage sorption freezing cycle is employed. Engine exhaust gas temperature isn’t stable. Sorption beds are cooled directly by ambient air. 1. Trucks vibrates continually at driving conditions; 2. Available space for the sorption freezing system is very limited; 4.Critical heat transfer conditions: 3. Pressure drop of exhaust gas in the sorption bed is 2400-3000 Pa;
  6. 6. Schaffhausen, 22nd / 23rd June, 2017 Page 6 Two-stage sorption freezing cycle Single stage cycle Two stage cycle Desorption temperature Adapt to the critical operation condition Sorption temperature 166oC 136oC 48oC 104oC Advantage of the two-stage cycle:
  7. 7. Schaffhausen, 22nd / 23rd June, 2017 Page 7 2. Sorption freezing system for refrigerated trucks MnCl2 sorption bed(HTS bed) CaCl2 sorption bed(MTS bed) Tank Condenser • MnCl2 sorption bed (HTS bed) MnCl2+ENG-TSA • CaCl2 sorption bed (MTS bed) CaCl2+ENG-TSA • Condenser and Evaporator • Expansion valve • Liquid storage tank Evaporator
  8. 8. Schaffhausen, 22nd / 23rd June, 2017 Page 8 MnCl2 sorption bed(HTS bed) CaCl2 sorption bed(MTS bed) Tank Condenser Evaporator Working principle • Sorption process of HTS bed/Desorption process of MTS bed • Evaporator→HTS bed MTS bed → Condenser Air Exhaust
  9. 9. Schaffhausen, 22nd / 23rd June, 2017 Page 9 MnCl2 sorption bed(HTS bed) CaCl2 sorption bed(MTS bed) Tank Condenser Evaporator Working principle Air Exhaust • Sorption process of HTS bed/Desorption process of MTS bed • Evaporator→HTS bed MTS bed → Condenser • Resorption process between HTS bed and MTS bed • HTS bed → MTS bed
  10. 10. Schaffhausen, 22nd / 23rd June, 2017 Page 10  Sorption beds consist of many unit tubes: Experimental system Characteristic of the sorption beds: • Exhaust gas and ambient air exchange heat with the external face of the unit tubes; • Sorption beds can work well at the vibration state. Structure of the sorption bed and the unit tube
  11. 11. Schaffhausen, 22nd / 23rd June, 2017 Page 11 • Plate-fin evaporator • Parallel-flow condenser and Liquid storage tank Experimental system
  12. 12. Schaffhausen, 22nd / 23rd June, 2017 Page 12 3. Test the experimental system in the lab  Use the hot air to simulate the exhaust gas;
  13. 13. Schaffhausen, 22nd / 23rd June, 2017 Page 13 Experimental results in the lab Air inlet and outlet temperature Working pressure Refrigerating temperature -20oCRefrigerating temperature -10oC
  14. 14. Schaffhausen, 22nd / 23rd June, 2017 Page 14 Experimental results in the lab Maximum refrigerating capacity: 2.46 kW Minimum refrigerating temperature: -25oC Hot air temperature:210oC Meet requirements of this refrigerated truck
  15. 15. Schaffhausen, 22nd / 23rd June, 2017 Page 15 4. Test the experimental system on the truck Liquid storage tank CaCl2 sorption bed(MTS) Condenser Evaporator MnCl2 sorption bed(HTS)
  16. 16. Schaffhausen, 22nd / 23rd June, 2017 Page 16 Experimental system on the truck Data acquisition system Sorption-type refrigerated truck Evaporator Sorption beds Condenser
  17. 17. Schaffhausen, 22nd / 23rd June, 2017 Page 17 Experimental results on the truck • Engine exhaust gas temperature:200-250oC • Ambient temperature: 25oC • Chilled air outlet temperature of the evaporator: -15oC • Meet requirements for transporting: fresh foods and some frozen foods Air inlet and outlet temperature Refrigerating capacity
  18. 18. Schaffhausen, 22nd / 23rd June, 2017 Page 18 5. Conclusions • Experimental results show that the system can work very well under critical operating conditions. An exhaust waste heat-driven solid sorption freezing system is designed and established for a refrigerated truck. • There are still some questions to be solved for the refrigeration cycle for refrigerated trucks. • Experimental results show that the system can meet the required refrigerating capacity of this refrigerated truck.
  19. 19. Schaffhausen, 22nd / 23rd June, 2017 Page 19 • [1] P. Gao, L.W. Wang, R.Z. Wang, D.P. Li, Z.W. Liang. Optimization and performance experiments of a MnCl2/CaCl2-NH3 two-stage solid sorption freezing system for a refrigerated truck. International Journal of Refrigeration 2016;71:94-107. • [2] P. Gao, X.F. Zhang, L.W. Wang, R.Z. Wang, D.P. Li, Z.W. Liang, A.F. Cai. Study on MnCl2/CaCl2-NH3 two-stage solid sorption freezing cycle for refrigerated trucks at low engine load in summer. Energy Conversion and Management, 2016; 109: 1-9 • [3] P. Gao, L.W. Wang, R.Z. Wang, X.F. Zhang, D.P. Li, Z.W. Liang, A.F. Cai. Experimental investigation of a MnCl2/CaCl2-NH3 two-stage solid sorption freezing system for a refrigerated truck. Energy 2016; 103:16-26 • [4] P. Gao, L.W. Wang, R.Z. Wang, D.P. Li, Z.W. Liang. Performance of an optimized MnCl2/CaCl2-NH3 two-stage solid sorption freezing system for a refrigerated truck. 2016 HPC & IHTS Conference, University of Nottingham, UK. Some papers published by P. Gao et al.
  20. 20. Contact: Name: Peng Gao Address: 800 Dongchuan Road, Shanghai Country: China Phone:+86-21-34208038 Fax:+86-21-34206814 E-Mail:1059781237@qq.com Thanks a lot for your attention.

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