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The variation of the generator and condenser temperatures as well as the intercooler pressure were considered for an evaporator temperature of −10 °C and a unitary cooling capacity of 1 kW.
Thermodynamic (energy and exergy) analyses and optimization studies of two-stage transcritical N2O and CO2 cycles, incorporating compressor intercooling, are presented based on cycle simulation employing simultaneous optimization of intercooler pressure and gas cooler pressure.
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The two-stage CO2 cycle with the intercooler yielded a 13.1% improvement of the cooling COP at the intercooling pressure of 6 MPa.
The analysis shows that the cycle dimensionless power can be optimized by searching the optimum heat conductance distributions among the hot- and cold-side heat exchangers, the regenerator and the intercooler for fixed total heat exchanger inventory, and by searching the optimum intercooling pressure ratio.
The PCU consists of a gas turbine, a recuperator, a precooler, low-pressure and high-pressure compressors, an intercooler, and a generator.
The design and operating parameters include inlet temperatures to compressors and turbines and pressure ratios of intercooler and reheater.
The make-up water temperature also affects the optimal pressure level for intercooling and it is shown that an optimal position can be decided considering design parameters of the compressor and the water circuit.
Most of the abovementioned literature studies have been carried out to improve the performance of real gas power plants through the optimization of design and operating parameters such as compressor and turbine inlet temperatures, pressure ratios of intercooling, reheat, and conductance of heat exchangers [12, 29, 30, 31, 32, 33].
In this innovative PCS, the working gas is nitrogen whose flow rate delivers power to a turbine driving with the same shaft two compressors (low and high pressure) separated by an intercooler.
The main objective of this investigation is to identify and assess advanced improvements to the combined cycle such as gas turbine firing temperature, pressure ratio, combustion techniques, intercooling, enhanced blade cooling schemes and supercritical steam cycles that will lead to significant performance improvements in coal based power systems.
The results obtained by the energy-exergy analysis indicate that by increasing the pressure ratio compressor, exergy destruction of high-pressure compressors, intercooler, gas turbine and the special produced work of gas turbine cycle constantly increase and the exergy destruction of recuperator, in contrast, decreases continuously.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com