Performance characteristics and modelling of a micro gas turbine for their integration with thermally activated cooling technologies

Abstract

SUMMARYWe have developed a simple model of a micro gas turbine system operating at high ambient temperatures and characterized its performance with a view to integrating this system with thermally activated cooling technologies. To develop and validate this model, we used experimental data from the micro gas turbine test facility of the CREVER research centre. The microturbine components were modelled and the thermodynamic properties of air and combustion gases were estimated using a commercial process simulator. Important information such as net output power, microturbine fuel consumption and exhaust gas mass flow rate can be obtained with the empirical correlations we have developed in this study. This information can be useful for design exhaust gas fired absorption chillers. Copyright # 2006 John Wiley & Sons, Ltd.KEY WORDS: modelling; micro gas turbine; cogeneration; waste heat; cooling BACKGROUND AND OBJECTIVESFor building applications in which energy demand is closely related to climatic conditions, adding an absorption chiller to a micro gas turbine based cogeneration system is a good way to increase cost efficiency. At high ambient temperatures, however, the performance of the micro gas turbine is somewhat degraded. Manufacturers offer only limited information on microturbine derated performance characteristics at off-design conditions (power capacity,

Theoretical and experimental evaluation of an indirect-fired GAX cycle cooling system

“…The thermal energy of the exhaust gases is recovered to drive an absorption cooling system before being rejected to the Table 1 shows the main characteristics of the MGT, operating in steady state conditions. More specific data of the exhaust gases at different conditions have been reported [15].…”

“…The following parameters were used in the MGT simulations: isentropic and mechanical efficiency of the compressor, 74% and 89%, respectively; compression ratio, 3.35; hot stream outlet temperature approach in the regenerator, 93°C; isentropic and mechanical efficiency of the turbine, 86% and 97.4%, respectively; turbine discharge pressure, 1 bar. More details of the MGT simulation are reported by [15].…”

Determination of Optimized Parameters for the Flexible Operation of a Biomass-Fueled, Microscale Externally Fired Gas Turbine (EFGT)

“…Although higher efficiencies of 25% for EFGT have been reported [30], for the relevant size within this study, we expect an electrical efficiency below 20% [13,15,22,30]. Actually, there is no exact definition for EFGT classes with respect to the plant size, so we defined microscale, based on other researches, as being up to 200 kW el [31][32][33][34]. An overview of existing research on EFGT is given in Table 2.…”

Selection of a trigeneration system using a fuzzy AHP multi-criteria decision-making approach

“…Nevertheless, high cost prevents its popularization. [33]. The concept of microturbine usually means combustion turbines, which produce between 25 and 500 kW of power.…”