Abstract
Performance metrics of a system with single input and single output is straight forward and is generally termed as ‘efficiency’. However, for systems with multiple outputs, defined performance metrics has to include effects of all outputs on a rational basis. For systems with both multiple inputs and outputs such definition is even more complicated. Polygeneration is the integration of multiple utility outputs with one or more inputs for better performance. The better performance may again be assessed from different aspects, e.g., thermodynamic, economic, social, etc. Performance metrics of polygeneration is not unique. It depends on type of systems as well as objective of evaluation of it. In this paper, several possible performance parameters for polygeneration are discussed. Evaluation of performance is also tested with multi-dimensional viewpoints. Simulation results of two polygeneration schemes are used to show case studies for these defined performance parameters. Relative performance of polygeneration schemes with different fuel inputs is presented to show the performance variation of these schemes with multi-dimensional viewpoints.
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Abbreviations
- EPtrigen :
-
Overall energy performance of trigeneration plant
- \({\dot{\text{E}}\text{x}}_{\text{cool}}\) :
-
Exergy of cooling rate, MW
- Exfuel :
-
Exergy of fuel, MJ/kg
- \({\dot{\text{E}}\text{x}}_{\text{heat}}\) :
-
Exergy of utility heat rate, MW
- \(\dot{F}\) :
-
Fuel–energy required for the polygeneration, MW
- \(\dot{F}_{\text{ref}}\) :
-
Reference amount of fuel–energy, MW
- LHVfuel :
-
Lower heating value of fuel, MJ/kg
- \(\dot{m}_{\text{fuel}}\) :
-
Mass flow rate of fuel input, kg/s
- PEStrigen :
-
Primary energy savings of trigeneration plant
- \(\dot{Q}_{\text{cool}}\) :
-
Cooling rate, MW
- \(\dot{Q}_{\text{desali}}\) :
-
Heat input rate to desalination, MW
- \(\dot{Q}_{\text{heat}}\) :
-
Utility heat output rate, MW
- \(\dot{Q}_{\text{gen}}\) :
-
Heat input to refrigeration generator, MW
- \(\dot{Q}_{i}\) :
-
Utility heat at temperature T i , MW
- T i :
-
Temperature of utility heat, K
- T 0 :
-
Environment temperature, K
- T gen :
-
Temperature of refrigeration generator, K
- \(\dot{W}_{\text{GT}}\) :
-
Gas turbine power, MW
- \(\dot{W}_{\text{ST}}\) :
-
Steam turbine power, MW
- \(\dot{W}_{\text{net}}\) :
-
Net power output, MW
- x i :
-
Priority factor of ith utility
- η a :
-
Artificial thermal efficiency
- η boiler :
-
Reference boiler efficiency
- η e :
-
Reference power plant electric efficiency
- η cogen :
-
Energy efficiency of cogeneration plant
- η ex,cogen :
-
Exergy efficiency of cogeneration plant
- η ex,trigen :
-
Exergy efficiency of trigeneration plant
- η GT :
-
Gas turbine cycle efficiency
- η power plant :
-
Power plant overall efficiency
- η ST :
-
Steam turbine cycle efficiency
- CHP:
-
Combined heat and power
- COP:
-
Coefficient of performance of refrigeration
- COPVAR :
-
Coefficient of performance for vapor absorption refrigeration
- FESR:
-
Fuel–energy savings ratio
- IROS:
-
Incremental return on sustainability
- MED:
-
Multi-effect distillation
- MSF:
-
Multi-stage flash
- RO:
-
Reverse osmosis
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Acknowledgments
Mr. Kuntal Jana gratefully acknowledges the fellowship awarded by Council of Scientific and Industrial Research (CSIR-New Delhi, India) for this research toward PhD.
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Jana, K., De, S. Polygeneration performance assessments: multi-dimensional viewpoint. Clean Techn Environ Policy 17, 1547–1561 (2015). https://doi.org/10.1007/s10098-014-0885-6
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DOI: https://doi.org/10.1007/s10098-014-0885-6