Performance evaluation and economic assessment of a gas power plant with solar and desalination integrated systems

In this study, a new configuration of a cogeneration system of electricity and freshwater in integration with solar collector has been thoroughly investigated. A gas power plant is modeled thermodynamically. The results of this modeling are compared with the actual data of a power plant to verify the simulation. Subsequently, by placing multi-effect desalination with thermal vapor compression and solar collectors, the functions including energy and exergy efficiencies and carbon dioxide emissions of the power plant have been studied. By applying the desalinating cycle and solar collectors, the energy efficiency of this power plant is increased from 35% to 46% and the exergy efficiency from 37% to 48%. This configuration of the cogeneration system with linear solar collectors produces 16.479 m3 of fresh water per day while reducing the CO2 emissions by 37,216 tons/d.http://www.deswater.comam2020Mechanical and Aeronautical Engineerin

Sensitivity analysis of combined cycle parameters on exergy, economic, and environmental of a power plant

In this paper, a typical combined cycle power generation unit in Iran is simulated by a mathematical method in order to perform sensitivity analysis on environmental emission and electricity price. The results of this study demonstrate that the efficiency of the power plant depends on both gas turbine design parameters such as gas turbine inlet temperature, compressor pressure ratio and steam cycle design parameters such as HRSG pinch point temperature, condenser pressure. The results demonstrate that an increase in TIT and compressor pressure ratio have a significant effect on exergy efficiency and destruction.http://link.springer.com/journal/109732020-05-28hj2020Mechanical and Aeronautical Engineerin

Experimental Investigation of Flow Control over an Ahmed Body using DBD Plasma Actuator

Ahmed body is a standard configuration of road vehicles and most of the studies of automobile aerodynamics are performed based on it. In this paper, the plasma actuator was used as an active flow control method to control the flow around the rear part of the Ahmed body with the rear slant angle of 25°. Experiments were carried out in a wind tunnel at two different velocities of U=10m/s and U=20m/s using steady and unsteady excitations. The hot-wire anemometer was used to measure the vortex shedding frequency at the downstream of the body. Pressure distribution was measured using 52 sensors and total drag force was extracted with a load cell. Furthermore, smoke flow visualization was employed to investigate the flow pattern around the body. The results showed that the plasma actuator was more effective on the pressure distribution and total drag force at the velocity of U=10m/s. In fact, by applying steady and unsteady excitations there was 7.3% and 5% drag reduction; respectively. While at the velocity of U=20m/s; the actuator had no significant effect on pressure distribution and total drag. As a remarkable result, the plasma actuator, especially in the steady actuation, has demonstrated its effectiveness on dispersing the longitudinal vortices and suppressing the separated flow on the rear slant at low velocities