Abstract
To utilize waste heat from fishing boats, an organic Rankine cycle/vapor compression cycle system was employed for ice making and a thermodynamic model was developed. Six working fluids were selected and compared in order to identify suitable working fluids which may yield high system efficiencies. The calculated results show that R600a is most suitable working fluid through comprehensive comparison of efficiency, size parameter, pressure ratio, coefficient of performance, system pressure and safety.
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Abbreviations
- COP c :
-
Coefficient of performance for VCC
- COP s :
-
Overall coefficient of performance for ORC/VCC
- CRPR :
-
Ratio of COP c to PR
- CPRm A :
-
Ratio of Q eva to overall mass flows of ORC/VCC
- h 1 :
-
Enthalpy at working fluid pump outlet, kJ/kg
- h 1s :
-
Enthalpy at working fluid pump outlet based on isentropic process, kJ/kg
- h 2 :
-
Enthalpy at expander inlet, kJ/kg
- h 3s :
-
Enthalpy at expander outlet based on isentropic process, kJ/kg
- h 4 :
-
Enthalpy at working fluid pump inlet, kJ/kg
- h 5 :
-
Enthalpy at evaporator inlet, kJ/kg
- h 6 :
-
Enthalpy at evaporator outlet, kJ/kg
- h 7s :
-
Enthalpy at compressor outlet based on isentropic process, kJ/kg
- m ic :
-
Mass flow rate of working fluid for VCC, kg/s
- m p :
-
Mass flow rate of working fluid for ORC, kg/s
- P 6 :
-
Pressure at compressor inlet, kPa
- P 7 :
-
Pressure at compressor outlet, kPa
- PR :
-
Pressure ratio between compressor inlet and outlet
- Q boi :
-
Generator heat input, kW
- Q eva :
-
Evaporator power for ice maker, kW
- SP :
-
Expander size parameter, m
- T boi :
-
Generation temperature in generator, °C
- T c :
-
Condensation temperature, °C
- T crit :
-
Critical temperature, °C
- T h :
-
Hot water temperature at generator inlet, °C
- V 2 :
-
Volumetric flow at expander inlet, m3/s
- V 3 :
-
Volumetric flow at expander outlet, m3/s
- VFR :
-
Volumetric flow ratio
- W com :
-
Compressor work input, kW
- W exp :
-
Expander work output, kW
- W net :
-
Net work output for ORC, kW
- W pump,w :
-
Working fluid pump power consumption, kW
- WRm :
-
Ratio of W net to m p , kW.s/kg
- η com :
-
Compressor isentropic efficiency
- η exp :
-
Expander isentropic efficiency
- η p :
-
Organic Rankine cycle efficiency
- η pump,w :
-
Working fluid pump isentropic efficiency
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Hi-Tech Research and Development Program (863) of China (No.2012AA053003), the National Natural Science Foundation of China (No.51106161) and Guangdong Province and Chinese Academy of Sciences Comprehensive Strategic Cooperation Projects (2012B091100263).
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Bu, X., Wang, L. & Li, H. Working fluids selection for fishing boats waste heat powered organic Rankine-vapor compression ice maker. Heat Mass Transfer 50, 1479–1485 (2014). https://doi.org/10.1007/s00231-014-1350-0
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DOI: https://doi.org/10.1007/s00231-014-1350-0