One of the problems of producing fresh water by reverse osmosis is its sensitivity to process conditions. In this article, a method for redesigning the hydraulic turbocharger rotor as an energy Recovery device in desalination units has been discussed. For this purpose, firstly, the performance of a desalination unit in operation is investigated. Then, using turbomachinery similarity relations and CFD, two new rotors have been designed for two high- and low-pressure modes and replaced with the primary rotor. The validated results with the test show that despite changing membrane inlet pressure, the amount of produced water was not changed, the total efficiency has increased by more than 4% and the energy recovery has increased by about 2% in the high-pressure mode, which shows that this method can be used in situations where the pressure change of the membranes is noticeably higher or lower than the initial design pressure.

2Due to the increasing global demand for energy and growing environmental concerns, the use of renewable resources like biomass has become highly important. Sugarcane bagasse, as an agricultural byproduct, is a valuable source for sustainable energy production. This article reviews the main approaches for energy recovery from bagasse. Thermochemical methods, including pyrolysis, gasification, direct combustion, and hydrothermal liquefaction, have been evaluated. Additionally, biochemical processes like fermentation for bioethanol production and the physical-thermochemical method of briquetting have been examined. The results indicate that each method has its own specific advantages and limitations. Hydrothermal liquefaction converts bagasse into high-quality bio-oil, while briquetting increases its density and calorific value. Direct combustion is the most common method but faces challenges such as high moisture content, which can be mitigated through co-combustion. Furthermore, gasification and fermentation are efficient methods for producing gaseous and liquid fuels. This review emphasizes that sugarcane bagasse has significant potential for energy recovery, and selecting the optimal process can substantially help reduce reliance on fossil fuels and improve waste management.

This research is a model of CHP system which used energy for Parand City, produced by Gas Turbine from Parand power plant. At first, the structures are simulated base on the type of materials and the usage of structures by data gathering & simulation software such as HAP, Carrier & E-Quest software. Subsequently the Thermal Energy consumption for the City is estimated. And optimization point for production of energy is found.Retrievable energy potential from Power Plant Gas Turbines is obtained by Thermo-flow software. Then with respect to the retrievable energy potential & average demand of Thermal energy usage of City, the steam produced capacity from simulation of HRSG by Thermo-flex is calculated. Finally, the project is economically evaluated by excel software.

The Allam cycle is an oxy-combustion cycle for generating electricity from natural gas with near-zero emissions. When the fuel is changed to liquified natural gas, the gas compression work is reduced; therefore; the power plant cycle can be highly competitive with the other conventional power plant cycles. In this study, two alternatives for using cold energy during the liquified natural gas regasification were investigated to reduce the CO2 compression work. The results indicated that the direct heat integration of liquified natural gas regasification and liquefaction of captured CO2 in the Allam cycle leads to an energy saving of 46.34%. Additionally, the amount of captured CO2 during indirect heat integration of the Allam cycle with an organic Rankine cycle is less than the direct method. However, this method is the best choice for improvement, generating additional electricity and showing a 58% energy saving.

A huge part of the thermal energy consumed in energy industries is lost after exiting the process. Some of this waste heat can be recovered by various methods such as generating electrical energy, generating hot air for the production process or providing hot water. In Iran, the cement industry has always been far from the optimal use of resources, including energy, due to the existence of energy subsidies. In this research, the heat loss from the baking system of Nireez white cement plant as a model industry of the country to evaluate the simultaneous production of heat and electricity by using the organic Rankine cycle that generates electric power has been investigated in Span Plus V12 software. This evaluation is done to calculate the heat loss, including the mass and energy balance on the cooking system, as well as the energy balance on the pre-cooking system. The heat energy obtained enters the Rankine cycle and is converted into energy by the turbine. The results show that 635 kilowatts of electrical energy was produced from energy recycling, which leads to the elimination of 317.5 kg/hour of greenhouse gas.