Abstract
Gas turbines incur a loss of output power during hot seasons due to high ambient air temperatures, and input air cooling systems are often used to partly offset this problem. Here, results are reported for an investigation of the utilization of a heat pump to cool the inlet air of a gas turbine compressor. The analyses are carried out for two climates: the city of Yazd, Iran, which has a hot, arid climate, and Tehran, Iran, which has a temperate climate. The heat pump input power is obtained from the gas turbine. The following parameters are determined, with and without the heat pump: net output power, first and second law efficiencies, quantities and costs of environmental pollutants, entropy generation and power generation. The results suggest that, by using the air-inlet cooling system, the mean output power increases during hot seasons by 11.5% and 10% for Yazd and Tehran, respectively, and that the costs of power generation (including pollution costs) decrease by 11% and 10% for Yazd and Tehran, respectively. Also, the rate of generation of pollutants such as NOx and CO decrease by about 10% for Yazd and 35% for Tehran, while the average annual entropy generation rate increases by 9% for Yazd and 7% for Tehran, through air-inlet cooling. The average increase of the system first law efficiency is 2% and of the system second law efficiency is 1.5% with the inlet-air cooling system.
Highlights
Electricity contributes significantly to human life and societies today, and its lack impedes economic development
Gas turbines operate in a continual cycle and intake a constant air volumetric flow rate, so air volumes entering the compressors experience a drop in density as the air is heated
The approach taken in this study, which includes several innovative aspects, involves a feasibility analysis of gas turbine inlet air cooling using heat pumps, supporting energy, exergy and economic analyses, and determination of the social costs of air pollutants, fuel consumption, electricity cost and payback period for the capital investment of a heat pump installation in Yazd and Tehran
Summary
Electricity contributes significantly to human life and societies today, and its lack impedes economic development. Dawoud et al compared gas cycle input air cooling systems in two areas in Oman They concluded that fog chillers increase electrical energy generation by. By investigating the performance of a gas cycle including two high-pressure and low-pressure compressors and an inter-cooler evaporative chiller with a heat recovery system, Basilly found that cooling the compressor inlet air with an absorption chiller increased the efficiency and the turbine power 3.5% and 50%, respectively [19]. Farzaneh-Gord and Deymi-Dashtebayaz showed for gas turbines at Khangiran power plant located in the south of Iran that reducing the compressor inlet temperature from 25 to 4 °C can increase gas cycle efficiency by 1.5% to 5% for about 10 months of the year [23]. The approach taken in this study, which includes several innovative aspects, involves a feasibility analysis of gas turbine inlet air cooling using heat pumps, supporting energy, exergy and economic analyses, and determination of the social costs of air pollutants, fuel consumption, electricity cost and payback period for the capital investment of a heat pump installation in Yazd and Tehran
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