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A novel cogeneration system based on SOFC and air source heat pump with heat recovery

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The system proposed is based on SOFC combined with an air source heat pump (ASHP): exhausted gases of SOFC are mixed with inlet air of heat pump to increase efficiency in particular when evaporator may freeze.

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A novel cogeneration system based on SOFC and air source heat pump with heat recovery

  1. 1. ANALYSIS OF A COGENERATION SYSTEM BASED ON SOLID OXIDE FUEL CELLAND AIR SOURCE HEAT PUMP WITH NOVEL HEAT RECOVERY Giulio Vialetto, Marco Noro and Masoud Rokni
  2. 2. Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION SOFC (solid oxide fuel cell) waste gases has a high percentage of water (steam). If not only sensible but also latent heat could be recovered, energy efficiency of the system could be increased.
  3. 3. Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Air source heat pumps (ASHP) are cheaper than ground source heat pumps (GSHP). In some climates, however, evaporation section may frozen.
  4. 4. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) SOFC waste gases are mixed with inlet air into an adiabatic mixer, increasing both temperature and absolute humidity.
  5. 5. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) The aim is to increase COP of ASHP and decrease the freezing of evaporation section.
  6. 6. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) A traditional heat pump is simulated, a frost factor is consider in the cases of outdoor air temperature between –10 to 10 °C and relative humidity between 50- 100 %.
  7. 7. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) Simulations were performed with a SOFC of 50 kW nominal power and an ASHP 7.7 heating nominal power. Temperature varies from –7.5 °C to 15 °C, relative humidity from 25% to 100%. Two benchmarks are defined to evaluate the performances: COP variation and %PES
  8. 8. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) COP variation verifies if COP of system proposed is higher than a traditional ASHP %PES verifies which is the primary energy saving of the innovative system compared with a traditional one. 𝐶𝑂𝑃𝑣𝑎𝑟𝑖𝑎𝑡𝑖𝑜𝑛 = 𝐶𝑂𝑃𝑖𝑛𝑛𝑜𝑣 ,𝑠𝑦𝑠 𝐶𝑂𝑃𝑡𝑟𝑎𝑑 ,𝑠𝑦𝑠 − 1 ∙ 100 %𝑃𝐸𝑆 = 1 − 𝑃𝐸𝑖𝑛𝑛𝑜 ,𝑠𝑦𝑠 𝑃𝐸𝑡𝑟𝑎𝑑 ,𝑠𝑦𝑠 ∙ 100 = 1 − 𝐸𝑎𝑣𝑎 𝜂 𝑒𝑙𝑒 + 𝐻𝑎𝑣𝑎 𝜂 𝑏𝑜𝑖𝑙𝑒𝑟 𝐹𝑆𝑂𝐹𝐶 ∙ 100
  9. 9. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) COP in function of external air temperature (T2) in the two cases (air relative humidity - SOFC nominal electric power). Case 1: 25 % - 20 kW; case 2: 100 % - 50 kW
  10. 10. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) COP variation varying the external inlet air temperature for four very different cases in terms of SOFC nominal power and air relative humidity.
  11. 11. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) Primary energy saving varying the external inlet air temperature for four very different cases in terms of SOFC nominal power and air relative humidity.
  12. 12. OVERVIEW MODEL ANALYSIS CONCLUSIONSIMULATION Analysis of a cogeneration system based on solid oxide fuel cell and air source heat pump with novel heat recovery (Vialetto G., Noro M. and Rokni M.) A novel heat recovery for system composed by ASHP and SOFC is proposed and analysed. Simulations show that is possible to increase efficiency of the system, COP is higher when a powerful SOFC is available and when air has a high relative humidity: in these cases SOFC prevents freezing of evaporator section of ASHP.
  13. 13. THANK YOU FOR YOUR ATTENTION ANY QUESTION? CONTACT E-Mail: giulio@giuliovialetto.it Site: www.giuliovialetto.it

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