Abstract
In a modified ejector cooling system (MECS), the ejector is assisted by a jet pump that allows the MECS to operate at higher condenser pressure relative to that in a conventional ejector cooling system (ECS). The behavior of an MECS is analyzed herein for a new eco-friendly working fluid, R1234yf, and compared with the commonly used refrigerant R134a. Energy and exergy investigations are conducted for a fixed cooling capacity of 1 kW and fixed ejector exit pressure of 700 kPa. The coefficient of performance (COP) obtained in the modified system is 0.29, whereas for the conventional ejector cooling system it is only 0.03 under the same designed conditions. At a generator temperature between 82 and 94 °C, the heat load in the MECS varies between 2.5 and 3 kW whereas the ECS consumes 14–44 kW while operating both systems at the same condenser pressure. The pump work required in the MECS is found to be higher than in the ECS, and it is higher with R134a in both systems. The total irreversibility of the MECS is calculated as 1.023 kW and 0.93 kW for R134a and R1234yf, respectively, under the designed conditions. Increasing the ejector exit pressure is found to decrease the performance of the modified system.
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Abbreviations
- CAS:
-
Constant area section
- COP:
-
Coefficient of performance
- ECS:
-
Ejector cooling system
- EES:
-
Engineering Equation Solver
- Eje:
-
Ejector
- ER:
-
Entrainment ratio
- ERS:
-
Ejector refrigeration system
- JP:
-
Jet pump
- MECS:
-
Modified ejector cooling system
- VCS:
-
Vapor compression system
- Ė :
-
Exergy (kW)
- h :
-
Specific enthalpy (kJ kg−1)
- I :
-
Irreversibility (kW)
- ṁ :
-
Mass flow rate (kg s−1)
- M :
-
Mach number
- P :
-
Pressure (kPa)
- Q :
-
Heat (kW)
- s :
-
Specific entropy (kJ kg−1 k−1)
- T :
-
Temperature (°C)
- V :
-
Velocity (m/s)
- W :
-
Power (kW)
- ρ :
-
Density of refrigerant (kg m−3)
- µ :
-
Entrainment ratio
- ƞ :
-
Efficiency
- γ :
-
Heat capacity ratio
- Con:
-
Condenser
- d:
-
Diffuser
- D:
-
Destruction
- Eje:
-
Ejector
- Eva:
-
Evaporator
- EV:
-
Expansion valve
- ex:
-
External fluid
- F:
-
Fuel
- Gen:
-
Generator
- gen:
-
Generation
- i :
-
Inlet
- JP:
-
Jet pump
- m :
-
Mixing
- n :
-
Nozzle
- o :
-
Outlet
- P :
-
Product
- ref:
-
Refrigerant
- 1,2,3,…:
-
State points of fluid
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Sharma, B., Sachdeva, G. Energy and Exergy (2E) Analysis of a Jet Pump-Assisted Ejector Cooling System. Iran J Sci Technol Trans Mech Eng 48, 65–80 (2024). https://doi.org/10.1007/s40997-023-00644-y
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DOI: https://doi.org/10.1007/s40997-023-00644-y