No abstract

This study implies the significance of a trigeneration (TG) system, which converts a single fuel source into three useful energy products (i. e. power, heating, and cooling), and focuses on the simulation of a TG system with direct co-combustion of poultry wastes. The methodology is applied to a case study in northwest of Turkey to investigate how local poultry manure and environmental conditions can be effective in the production of energy. In addition, thermodynamic assessment of the system is performed, and the performance of the TG system is assessed by using energy, exergy, and parametric analysis methods. Poultry litter to coal ratio was 50% at the beginning, then poultry litter ratio in the mixture was increased to 90%, and this has led to less CO 2 emissions from the TG and combined heat and power systems co-firing with poultry litter. With rice husk however the consumptions of TG and combined heat and power increased from 6533-6624 tonne per year, and 6549-6640 tonne per year, respectively. As a result, co-combustion of poultry waste can be considered as the best environmentally-friendly remedy to dispose chicken farm wastes, while catering the energy demand of the facility.

Utilizing compressors, natural gas compression stations (NGCS) supply the required pressure to transport the natural gas in pipelines. This study proposes to utilize the waste heat of gas turbines (GT), employed in these stations, to produce shaft power for compressors. A NGCS coupled to an Organic Rankine Cycle (ORC) is simulated by THERMOFLEX in this study. Ten different working fluids are compared against each other in the ORC to select a working fluid with the highest possible efficiency and obtainable power, and lowest possible environmental impacts. According to the results, n-Pentane is selected to be the working fluid, as compared to others, it better meets these criteria. The effects of the variation of the ambient temperature and the condenser pressure on the net power of the cycle working with n-Pentane are investigated in details. It was found that the utilization of waste heat in NGCS by an ORC can improve the energy efficiency and generates electricity for near rural areas.

-Recovering energy from municipal solid waste (MSW) is one of the most important issues of energy management in developed countries. This raises even more interest as world fossil fuel reserves diminish and fuel prices rise. Being one of main processes of waste disposal, anaerobic digestion can be used as a means to reduce fossil fuel and electricity consumption as well as reducing emissions. With growing demand for cooling in Turkey, especially during warm seasons and considering the energy costs, utilizing heat-driven absorption cooling systems coupled with an anaerobic digester for local cooling purposes is a potentially interesting alternative for electricity driven compression cooling. The aim of this article is to study the viability of utilizing biogas obtained from MSW anaerobic digestion as the main fuel for heating facilities of Gazi University, Turkey and also the energy source for an absorption cooling system designed for the central library of the aforementioned campus. The results prove that the suggested system is sustainably and financially appealing and has the potential to replace the conventional electricity driven cooling systems with a reasonable net present worth; moreover, it can notably reduce carbon dioxide emissions.