Energy and Exergy Analysis of Solar Organic Rankine Cycle Coupled with Vapor Compression Refrigeration Cycle
Abstract
:1. Introduction
2. System Configurations
3. Modelling and Analysis
- (1)
- The system operation is at steady-state conditions;
- (2)
- The heat and frictional losses in the cycle are negligible;
- (3)
- The variations in kinetic and potential energy are negligible;
- (4)
- The pumping, compression, and expansion processes are isentropic;
- (5)
- The throttling process in the expansion valve is isenthalpic;
- (6)
- The operation of the solar collector pump is negligible;
- (7)
- The economizer and evaporator of the ORC exchange heat such that the evaporator inlet and outlet qualities are 0 and 1, respectively.
- -
- ORC turbine
- -
- ORC condenser
- -
- ORC pump
- -
- ORC recuperator
- -
- Heat input
- -
- VCC compressor
- -
- VCC condenser
- -
- Expansion valve
- -
- Evaporator
4. Results and Discussion
4.1. Performance Analysis of ORC
4.2. Performance Analysis of ORC–VCC
5. Conclusions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Nomenclature
Abbreviations | |
COP | coefficient of performance |
CHP | combined heat and power |
CCHP | combined cooling, heat, and power |
Ex | exergy |
GHG | greenhouse gas |
GWP | global warming potential |
ORC | organic Rankine cycle |
ODP | ozone depletion potential |
VCC | vapor compression refrigeration cycle |
h | specific enthalpy [kJ/kg] |
mass flow rate [kg/s] | |
PTC | parabolic trough solar collector |
heat transfer [kW] | |
s | specific entropy [kJ/kg·K] |
T | temperature [K] |
work [kW] | |
efficiency [%] | |
Subscripts | |
compressor | |
condenser | |
evaporator in the vapor compression cycle | |
ex | exergy |
in | input |
o | ambient conditions |
oil | solar collector heat transfer oil |
organic Rankine cycle | |
vapor generator in the organic Rankine cycle | |
pump | |
PP | pinch point |
sc | solar collector |
turbine | |
thermal | |
water | condenser cooling water |
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Working Fluid | Molar Mass (kg/kmol) | Normal Boiling Point (°C) | Critical Temperature (°C) | Critical Pressure (kPa) | ODP/ GWP | Safety Group |
---|---|---|---|---|---|---|
R245fa | 134.05 | 15.0 | 153.9 | 3651 | 0/858 | A1 |
R114 | 170.92 | 3.6 | 145.7 | 3257 | 1/8590 | A1 |
R600 | 58.12 | −0.5 | 152.0 | 3796 | 0/1 | A3 |
R142b | 100.50 | −9.1 | 137.1 | 4055 | 0.065/1980 | A2 |
R152a | 114.04 | −29.5 | 94.7 | 3382 | 0/138 | A2 |
R1234yf | 66.05 | −24.0 | 113.6 | 4517 | 0/1 | A2L |
Parameter | Value |
---|---|
Atmospheric temperature, To [°C] | 25 |
Atmospheric pressure, Po [kPa] | 101.3 |
Solar intensity, G [W/m2] | 700 |
[-] | 0.81 |
Maximum thermal oil temperature, T10 [°C] | 150 |
Collector working pressure, Psc [kPa] | 2000 |
[kg/s] | 2 |
[°C] | 5 |
Turbine inlet pressure, P6 [kPa] | 1500–2500 |
Turbine inlet temperature, T6 [°C] | 130–140 |
[-] | 0.8 |
[-] | 0.75 |
[-] | 0.85 |
[-] | 0.8 |
Condensing temperature, T1 [°C] | 30–40 |
Condenser water inlet temperature, T14 [°C] | 15 |
[kg/s] | 2 |
Working Fluid | Operation Mode | Net Work (kW) | Thermal Efficiency * (%) | Second-Law Efficiency * (%) | Evaporator Capacity (kW) | Mass Flow Rate (kg/s) | Compressor Power (kW) | COP |
---|---|---|---|---|---|---|---|---|
R245fa | ORC | 15.82 | 13.1 (11.8) | 48.0 (43.7) | ||||
ORC–VCC | 13.00 | 25.0 (22.6) | 42.4 (38.6) | 17.29 | 0.55 | 3.12 | 5.54 | |
R114 | ORC | 17.37 | 12.3 (10.7) | 46.1 (40.4) | ||||
ORC–VCC | 14.17 | 23.6 (20.5) | 40.5 (35.5) | 19.08 | 0.94 | 3.55 | 5.37 | |
R600 | ORC | 18.86 | 12.9 (11.3) | 48.5 (43.1) | ||||
ORC–VCC | 15.47 | 24.7 (21.7) | 42.8 (38.0) | 20.69 | 0.35 | 3.76 | 5.51 | |
R142b | ORC | 23.62 | 11.5 (10.1) | 46.2 (41.5) | ||||
ORC–VCC | 18.66 | 23.9 (21.0) | 39.9 (35.8) | 30.44 | 0.89 | 5.50 | 5.54 | |
R152a | ORC | 22.17 | 8.6 (7.2) | 37.3 (33.1) | ||||
ORC–VCC | 15.56 | 21.7 (18.2) | 30.0 (26.7) | 40.22 | 0.84 | 7.34 | 5.48 | |
R1234yf | ORC | 19.77 | 8.1 (5.9) | 34.3 (28.0) | ||||
ORC–VCC | 13.75 | 19.4 (14.2) | 27.2 (22.2) | 33.81 | 1.50 | 6.69 | 5.06 |
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Kim, M.-H. Energy and Exergy Analysis of Solar Organic Rankine Cycle Coupled with Vapor Compression Refrigeration Cycle. Energies 2022, 15, 5603. https://doi.org/10.3390/en15155603
Kim M-H. Energy and Exergy Analysis of Solar Organic Rankine Cycle Coupled with Vapor Compression Refrigeration Cycle. Energies. 2022; 15(15):5603. https://doi.org/10.3390/en15155603
Chicago/Turabian StyleKim, Man-Hoe. 2022. "Energy and Exergy Analysis of Solar Organic Rankine Cycle Coupled with Vapor Compression Refrigeration Cycle" Energies 15, no. 15: 5603. https://doi.org/10.3390/en15155603