Abstract
Recently, using integrated energy systems for residential-scale applications has been of great interest to the researchers. The objective of this study is the proposal, techno-economic analysis, and optimization of the best prime mover for the residential scale combined cooling, heating, and power generation system (CCHP). Different prime movers consisting of solid oxide fuel cell (SOFC), internal combustion engine (ICE), microgas turbine (MGT), and hybrid SOFC/GT system for power production are integrated with HRSG and double effect Li/Br refrigeration system for heating and cooling generation, respectively. A parametric study is conducted on the best case to find the key decision variables. Also, a very cutting-edge optimization, which is 3D multi-objective optimization, is carried out for minimizing the unit product cost and emission and maximizing the exergetic efficiency. Results revealed that the hybrid SOFC/GT has higher exergy efficiency of 69.06% and unit product cost of 37.78 $ GJ−1, among other case studies. Also, optimization results indicate a maximum exergy efficiency of 73.15%, and a minimum cost of 25.08 ($ GJ−1) can be reached for the SOFC-/GT-based CCHP system. Moreover, the optimized emission for the best-case scenario becomes 62.52 g MWh−1.
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Abbreviations
- A :
-
Area, m2
- c :
-
Specific exergy cost, $ GJ−1
- Ċ :
-
Cost rate, $ h−1
- \(\dot{E}\) :
-
Exergy rate, kW
- f :
-
Exergoeconomic factor
- F :
-
Faraday constant, C mol−1
- \(\Delta \bar{g}^{0}\) :
-
Change in molar Gibbs free energy, J/mol
- h :
-
Enthalpy
- i r :
-
Interest rate
- j :
-
Current density, A m−2
- J :
-
PEME current density
- K :
-
Equilibrium constant
- LHVf :
-
Fuel lower heating value
- M :
-
Molar mass
- ṁ f :
-
Fuel mass flow rate
- N :
-
Operating hours, h
- \(n_{1} ,n_{2} , \ldots ,n_{7}\) :
-
Mole number of reaction components
- n e :
-
Number of electrons produced per hydrogen mole
- ṅ :
-
Molar flow rate
- N C :
-
Number of cells in the stack
- P :
-
Pressure
- PR:
-
Pressure ratio
- \(p_{{{\text{H}}_{ 2} {\text{O}}}}\) :
-
Partial pressure of H2O
- \(p_{{{\text{H}}_{ 2} }}\) :
-
Partial pressure of H2
- \(p_{{{\text{O}}_{ 2} }}\) :
-
Partial pressure of O2
- \(\dot{Q}_{\text{high}}\) :
-
Heat rate of the heater inside the Stirling engine, kW
- \(\dot{Q}_{\text{loss}}\) :
-
Heat loss rate of cooler inside the Stirling engine, kW
- R :
-
Total ohmic resistance
- R AR :
-
Anode recycling ratio
- R CR :
-
Cathode recycling ratio
- \(\bar{R}\) :
-
Universal gas constant, J mol-1 K
- RV:
-
Piston compression ratio of Stirling engine
- s :
-
Specific entropy
- T :
-
Temperature
- T g :
-
Gasification temperature
- U f :
-
Fuel utilization ratio
- V :
-
Voltage, V
- V 0 :
-
Reversible potential
- V C :
-
Cell voltage, V
- V loss :
-
Loss voltage, V
- V N :
-
Reversible cell voltage, V
- w :
-
Mole fraction of moisture in the biomass (kmol/kmol)
- Ẇ :
-
Power, kW
- y i :
-
Molar fraction
- y r :
-
Extent of water gas shift reaction, mol/s
- x r :
-
Extent of steam reforming reaction for methane, mol/s
- Ż :
-
Cost rate of components, $ h−1
- Ż CI :
-
Capital investment cost rate of components, $ h−1
- Ż OM :
-
Operating and maintenance cost rate of components, $ h−1
- ch:
-
Chemical
- ph:
-
Physical
- 0:
-
Dead state
- act:
-
Activation
- AB:
-
Afterburner
- AC:
-
Air blower
- an:
-
Anode
- AHX:
-
Air heat exchanger
- ca:
-
Cathode
- CEPI:
-
Chemical Engineering Plant Cost Index
- conc:
-
Concentration
- CRF:
-
Capital recovery factor
- D:
-
Destruction
- e:
-
Electrolyte
- FC:
-
Fuel blower
- FHX:
-
Fuel heat exchanger
- HS, gas:
-
Highest Stirling gas temperature
- i:
-
Inlet
- INV:
-
DC to AC inverter
- k:
-
kth component
- L:
-
Loss
- LS, gas:
-
Lowest Stirling gas temperature
- MC:
-
Moisture content
- PM:
-
Prime mover
- GT:
-
Gas turbine
- CCHP:
-
Combined cooling heating and power
- CHP:
-
Combined heating and power
- ICE:
-
Internal combustion engine
- PY:
-
Present year
- R:
-
Reforming
- S:
-
Shifting
- SOFC:
-
Solid oxide fuel cell
- SE:
-
Stirling engine
- tot:
-
Total
- η pcy :
-
Polytrophic efficiency
- η mech, SE :
-
Stirling mechanical efficiency
- ε :
-
Emission indicator
- ε SE :
-
Heater efficiency inside the Stirling engine
- ζ :
-
Lowest to highest temperature of Stirling engine
- γ :
-
Ratio of specific heats
- η I :
-
Energy efficiency
- η II :
-
Exergy efficiency
- φ :
-
Maintenance factor
- τ :
-
Annual plant operation hours
- σ :
-
Total ionic conductivity
- λ :
-
Content of water
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The authors would like to thank the center of excellence in design and optimization of university of Tehran.
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EG involved in methodology, simulation, writing original draft. PH took part in supervision, methodology, conceptualization. PA participated in supervision, validation, proofreading. LM took part in supervision, developing system schematic idea
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Gholamian, E., Hanafizadeh, P., Ahmadi, P. et al. 4E analysis and three-objective optimization for selection of the best prime mover in smart energy systems for residential applications: a comparison of four different scenarios. J Therm Anal Calorim 145, 887–907 (2021). https://doi.org/10.1007/s10973-020-10177-0
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DOI: https://doi.org/10.1007/s10973-020-10177-0