scholarly journals Review Paper on Inverted Brayton Cycles

2020 ◽  
pp. 78-84 ◽  
Keyword(s):  
Heat Recovery ◽  
Waste Heat ◽  
Combustion Engine ◽  
Thermodynamic Cycle ◽  
Exhaust Gas ◽  
Energy Of Combustion ◽  
Recovery System ◽  
Heat Recovery System ◽  
Primary Cycle ◽  
Further Development

The exhaust gas from an internal combustion engine contains approximately 30% of the thermal energy of combustion. Waste heat recovery (WHR) systems aim to reclaim a proportion of this energy in a bottoming thermodynamic cycle to raise the overall system thermal efficiency. One of promising heat recovery approaches is to employ an inverted Brayton cycle (IBC) immediately downstream of the primary cycle. However, it is a little-studied approach as a potential exhaust-gas heat-recovery system, especially when applied to small automotive power-plants.The experiments of the IBC prototype were conducted in the gas stand. The correlated IBC model can be utilized for the further development of the IBC system. Researchers were reviewed core paper on Inverted Brayton Cycles (IBC) and concluded that there were possibility of heat recovery system in that for changing different mechanical components.

scholarly journals Pyroelectric power generation from the waste heat of automotive exhaust gas

2020 ◽  
Vol 4 (3) ◽  
pp. 1143-1149 ◽  
Author(s):  
Juyoung Kim ◽  
Satoru Yamanaka ◽  
Ichiro Murayama ◽  
Takanori Katou ◽  
Tomokazu Sakamoto ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Thermodynamic Cycle ◽  
Time Dependent ◽  
Exhaust Gas ◽  
Heat Sources ◽  
Temperature Changes ◽  
Waste Heat Recovery System ◽  
Recovery System

A waste heat recovery system is investigated basically. Original electro-thermodynamic cycle and novel system are expected to be viable in any heat sources with time dependent temperature changes instead of the spatial temperature gradient.

Modeling and Simulation of an Inverted Brayton Cycle as an Exhaust-Gas Heat-Recovery System

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Zhihang Chen ◽  
Colin Copeland ◽  
Bob Ceen ◽  
Simon Jones ◽  
Alan Agurto Goya
Keyword(s):  
Heat Exchanger ◽  
Internal Combustion Engine ◽  
Thermodynamic Model ◽  
Heat Recovery ◽  
Test Bench ◽  
Combustion Engine ◽  
Brayton Cycle ◽  
Exhaust Gas ◽  
Recovery System ◽  
Heat Recovery System

The exhaust gas from an internal combustion engine contains approximately 30% of the thermal energy of combustion. The exhaust-gas heat-recovery systems aim to reclaim a proportion of this energy in a bottoming thermodynamic cycle to raise the overall system thermal efficiency. The inverted Brayton cycle (IBC) considered as a potential exhaust-gas heat-recovery system is a little-studied approach, especially when applied to small automotive power-plants. Hence, a model of the inverted Brayton cycle using finite-time thermodynamics (FTT) is presented to study heat recovery applied to a highly downsizing automotive internal combustion engine. IBC system consists of a turbine, a heat exchanger (HE), and compressors in sequence. The use of IBC turbine is to fully expand the exhaust gas available from the upper cycle. The remaining heat in the exhaust after expansion is rejected by the downstream heat exchanger. Then, the cooled exhaust gases are compressed back up to the ambient pressure by one or more compressors. In this paper, the exhaust conditions available from the engine test bench data were introduced as the inlet conditions of the IBC thermodynamic model to quantify the power recovered by IBC, thereby revealing the benefits of IBC to this particular engine. It should be noted that the test bench data of the baseline engine were collected by the worldwide harmonized light vehicles test procedures (WLTP). WLTP define a global harmonized standard for determining the levels of pollutants and CO2 emissions, fuel consumption. The IBC thermodynamic model was simulated with the following variables: IBC inlet pressure, turbine pressure ratio, heat exchanger effectiveness, turbomachinery efficiencies, and the IBC compression stage. The aim of this paper is to analysis the performance of IBC system when it is applied to a light-duty automotive engine operating in a real-world driving cycle.

Development of a Thermal Approach to Optimize the Waste Heat Utilisation From an Existing Gas Turbine Station Without Heat Recovery System

2003 ◽  
Author(s):  
Guyh Dituba Ngoma ◽  
Amsini Sadiki
Keyword(s):  
Gas Turbine ◽  
Heat Recovery ◽  
Waste Heat ◽  
Finned Tube ◽  
Pressure Tube ◽  
Exhaust Gas ◽  
Static System ◽  
Recovery System ◽  
Heat Recovery System ◽  
Tube Banks

The present work deals with a numerical simulation of a flow in finned tube banks arranged behind a gas turbine. Three models of dual-pressure tube systems are developed and analyzed in order to predict the static system performances by optimizing the utilization of the exhaust gas from an existing gas turbine without heat recovery system. For more precise modeling, the theoretical analysis of finned tube banks systems is based on the non-linear conservation equations of mass, momentum and energy. Simulations are accomplished to prove the effectiveness of the present work in performance prediction of the dual-pressure tube systems. The obtained results clearly show the necessity to take into account all relevant physical phenomena in the simulation of flows in and across finned tube banks installed behind a gas turbine. The results also reveal the different operating behavior of the developed models considering combined effects of the exhaust gas parameters and the tube geometries.

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