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Innovative cogeneration system for residential purpose

This system was presented ad the Global Conference on Global Warning 2015 in Athens. The system is made by a SOFC system and a ground source heat pump (GSHP).

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Innovative cogeneration system for residential purpose

  1. 1. A NEW COGENERATION RESIDENTIAL SYSTEM BASED ON SOLID OXIDE FUEL CELLS FOR A NORTHERN EUROPEAN CLIMATE Giulio Vialetto and Masoud Rokni Global Conference on Global Warming 2015, Athens (Greek)
  2. 2. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES FUEL ELECTRICITY GRID HEAT
  3. 3. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 1 0.42 0.52 1.9 1 0.9 HEATING 2.32 0.9 HEAT PRODUCED + 158 % (All energy fluxes are in kWh, COP of heat pump is assumed as 3.66, efficiency of the boiler 0.9) Innovative system Traditional system
  4. 4. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES SOFC - Simulation of the fuel cell and fuel reformer was made in DNA - Simulation of an inverter for DC/AC conversion with 92% of efficiency - Energy consumption of auxiliaries is considered with a lower overall efficiency SOFC Performances H/P 0.8262 ηSOFC 0.53 (SOFC of 1 kW at full load)
  5. 5. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES HEAT PUMP (GSHP) - Ground source heat pump (GSHP) with closed loop ground-coupled heat exchangers - Simulation using as reference a real heat pump according to UNI/TS 11300-3 and EN 14825Performance COP 5.1 (Performance at full load, W10/W55) - It covers heating demand (both space heating and DHW demand) when waste heat from SOFC is not enough Regarding simulation of GSHP with UNI/TS 11300-3 see also Energy and economic analysis of different heat pump systems for space heating (Busato F., Lazzarin R. and Noro M., 2012)
  6. 6. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES EQUIVALENT ELECTRIC LOAD (EEL) SOFC is driven by electricity demand related not only to the electrical demand of the user but also to the energy consumption of the heat pump in order to cover heating demand considering that waste heat of SOFC covers a part of it. EEL=f(ηSOFC, H/P, COPHEATINGELEDEMAND,HEATDEMAND) Regarding EEL see also Design of a combined heating, cooling and power system: Sizing, operation strategy and parametric analysis (Kavvadias K.C., Tosion A.P. and Maroulis Z.B. 2010)
  7. 7. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES
  8. 8. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES EQUIVALENT ELECTRIC LOAD (EEL) ADVANTAGES - EEL is more constant than only electrical demand during the day - It is required a smaller water tank than the other strategies - A paper (K.C. Kavvadias et al., 2010) shows that this strategy is more profitable than other ones DISADVANTAGES - It is necessary to know exactly the performances of the SOFC and heat pump in order to calculate the correct EEL
  9. 9. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES EQUIVALENT ELECTRIC LOAD (EEL) - following EEL with a maximum of 1 kW of SOFC electricity production ELF=min(EEL, 1 kW) (called ELF 1 kW) EEL is used to define ELF (Electric Load Following). The aim of the strategy is to follow the electric equivalent load and it is done in three different ways: - following EEL with a maximum of 2 kW of SOFC electricity production ELF=min(EEL, 2 kW) (called ELF 2 kW) - EEL monthly average is calculated and used as set point so SOFC works all the hour at constant power (called CO)
  10. 10. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 5 EEL(kWh) EEL ELF 2 kW
  11. 11. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 5 EEL(kWh) EEL CO
  12. 12. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES
  13. 13. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 11150 5472 212 198 3028 2458 4765 8986 13695 56 0 2000 4000 6000 8000 10000 12000 14000 Fuel in SOFC El. Prod. Grid in Grid out User ele. dem. GSHP ele. cons. SOFC heat prod. GSHP heat prod. User heat dem. Heat losses Energy (kWh) Energy fluxes with system under ELF 2 kW strategy
  14. 14. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 8928 4340 1486 97 3028 2701 3854 9876 13695 35 0 2000 4000 6000 8000 10000 12000 14000 Fuel in SOFC El. Prod. Grid in Grid out User ele. dem. GSHP ele. cons. SOFC heat prod. GSHP heat prod. User heat dem. Heat losses Energy (kWh) Energy fluxes with system under ELF 1 kW strategy
  15. 15. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES 11673 5671 1802 2025 3028 2420 5044 8850 13695 199 0 2000 4000 6000 8000 10000 12000 14000 Fuel in SOFC El. Prod. Grid in Grid out User ele. dem. GSHP ele. cons. SOFC heat prod. GSHP heat prod. User heat dem. Heat losses Energy (kWh) Energy fluxes with system under CO strategy
  16. 16. A new cogeneration residential system based on Solid Oxide Fuel Cell for a Northern European climate (Vialetto G., Rokni M.) OVERVIEW MODEL ANALYSIS CONCLUSIONSTRATEGIES CONCLUSION - System proposed has high primary energy saving ratio and efficiency of the fuel cell - Heat demand is mainly convered by GSHP - ELF 2 kW strategy shows that the system could be used for stand- alone user - CO strategy shows that a SOFC with a nominal power of 1 kW could be used only if net metering is possible
  17. 17. THANK YOU FOR YOUR ATTENTION ANY QUESTION? CONTACT E-Mail: giulio@giuliovialetto.it Site: www.giuliovialetto.it

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