Brayton cycle Pressure effect

The effectiveness of the regenerative Brayton cycle performance will depend on the efficiency of the fuel cell, compressor, and turbine units the pressure loss of gases flowing through the system the approach temperatures reached in the recuperative exchanger and, most importantly, the cost of the overall system. 

Consider a simple ideal Brayton cycle with fixed turbine inlet temperature and fixed compressor inlet temperature. What is the effect of the pressure ratio on the cycle efficiency ... 

More recent studies have been carried out on the corrosion behavior of steels and nickel-base alloys in extreme conditions for the CO2 environment, with temperature up to 750°C and pressures up to 250 bar [31—43] in support to the Brayton cycle. A compilation of the main conclusions of all these results is proposed below. The effects of parameters relating to the environment such as CO2 pressure or the amount of impurities in CO2 and the effect of parameters concerning the alloy such as the alloy composition and the alloy surface finish are highlighted. 

Figure 9-34 Estimated effects of recuperator interchannel leak size on Brayton cycle performance. (Modeling Assumptions for Symbols (1) Single unit Brayton generating 100 kWe (2) Turbine inlet temperature is fixed at 1150K (3) Leakage does not impact turbine flow (4) Reduced compressor/turbine efficiencies are not considered in the impact on power output (5) Changes in pressure losses are not...

Sensitivities to the main Brayton cycle design power operating parameters including compressor inlet pressure, compressor pressure ratio, compressor inlet temperature, turbine inlet temperature, recuperator and gas cooler effectiveness, and total AP of loop are discussed in Section 5.0. The following design constraints have been used to guide the current design state points ... 

FIG. 29-39 Performance map showing the effect of pressure ratio and tiirhine inlet temperature on a Brayton-Ranidne cycle. 

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