Aysegul Abusoglu

Thermodynamic analysis and life cycle assessment of the heating strategies in historical buildings: a case study

This paper presents the thermodynamic analysis and life cycle assessment (LCA) of the heating strategies in historical buildings. We evaluated two main systems used in historical buildings to provide heat: a central heating system, which is based on a method of heating the whole air volume within the building, and a localised heating system, which is based on a method of supplying the desired amount of heat to the individual occupants. After evaluating both systems in a historic mosque, we found that using a modern localised heating system like the carbon film heating, a comfortable temperature can be maintained while saving 22.4 MWh of electricity annually, compared with a conventional central heating system. Moreover, the carbon film heating system can reduce stress on the environment by 60% when compared with the conventional heat pump system.

Exergy-based industrial ecology assessment of integrated and separated power and heat production systems

In this paper, exergy-based industrial ecology concept is demonstrated in terms of exergetic rate of resource depletion by analysing two different combined heat and power productions systems: the CGAM system and a Diesel Engine Powered Cogeneration (DEPC) system. The analysis indicates that exergy-based industrial ecology concept can be successfully applied to cogeneration systems, demonstrating advantages of integrated generation. The weighted depletion number for separate productions of electricity and steam is determined to be 0.673 whereas the value for the integrated CGAM system is 0.532. The corresponding depletion numbers for the DEPC system are determined to be 0.590 and 0.480, respectively. It is clear from these numerical results that separate power and heat production system causes greater non-renewable resource depletion when compared with integrated systems.

Thermodynamic analysis and assessment of a municipal wastewater treatment system: a field study on sewage treatment

This paper is a field study on thermodynamic analysis and assessment of an actual municipal wastewater treatment facility. The system operation is described and a methodological approach based on the energy and exergy analyses is provided to assess the performance of a complex wastewater treatment system. Since the specific exergy value of the sludge is increased through treatment process, a new exergy based parameter, net exergy ratio (NExT), is defined to reflect the renewable and sustainable nature of the process. The system treats nearly 222,000 m² domestic wastewater per day by using the primary and secondary treatments. The NExT values for primary and secondary treatments are found as 2.81 and 1.31, respectively. When the sludge outputs of both processes are considered as waste, the exergetic efficiencies of subsystems in the actual municipal wastewater treatment plant (WWTP) can be obtained as 57.4% for primary treatment system (PTS) and 29.7% for secondary treatment system (STS).

Exergoeconomic assessment of a municipal primary and secondary sewage treatment

This paper presents the exergoeconomic analysis and assessment of a municipal primary and secondary sewage treatment systems. Operation of an existing municipal sewage treatment plant is described in detail and an exergoeconomic methodology based on SPECO method is provided to allocate cost flows through subcomponents of the plant. The system treats nearly 222,000m³ domestic wastewater per day by using the primary and secondary treatment systems. The exergetic efficiencies of the primary and secondary sewage treatment systems are determined to be 53.4% and 14.8%, respectively. The exergetic cost rate and the specific unit exergetic cost of the treated wastewater at the exit of the WWTP are found to be 62.05

Emission Characteristics of Diesel Engine-Powered Cogeneration Systems

/h and 3.804 ¢/m³, respectively.

Thermoeconomic Optimization of Hydrogen Production and Liquefaction by Geothermal Power

The industrial sector is a major electricity consumer. The growth rate of electricity demand is high especially in the developing countries and a continuous growth is anticipated for coming years. Many governments revise their energy policy introducing legislative and economic incentives to encourage private participation in the power generation investments. Generally, a favorable economic environment is created for the industries that make use of energy conservation, and cogeneration is an effective method of achieving this. Unfortunately power facilities have the potential of environmental pollution by the emission of harmful gases and other hazardous components. Power plants and cogeneration facilities emit some undesirable content in exhaust gases including solid particles, and these emissions, depending on their level, can be very harmful for human beings and other organisms (Frangopoulos, 1993; EPA, 2000).

Economic Optimization of Indirect Sewage Sludge Heat Dryer Unit for Sewage Sludge Incineration Plants

In this study, the thermoeconomic approximation is applied to the optimization of a case study of a geothermal hydrogen production and liquefaction system. The objective of this application is to minimize its overall product unit costs (electricity, hydrogen production, and hydrogen liquefaction). The approximation is based on the cost-optimal exergetic efficiency that is obtained for a component isolated from the remaining of the system components. The objective function that expresses the optimization methodology for each subcomponent of the system is developed. In the iterative optimization methodology, the variables, relative cost differences, and exergy efficiency with the corresponding optimal values are obtained. Exergoeconomically optimal values for total product cost flow rate, total cost fuel flow rate, cost of electricity, cost of hydrogen production, and cost of hydrogen liquefaction are calculated to be 1820

Assessment of Sewage Sludge Potential from Municipal Wastewater Treatment Plants for Sustainable Biogas and Hydrogen Productions in Turkey

/h, 274.2

Exergoeconomic analysis and optimization of combined heat and power production: A review

/h, 0.01908

Exergetic and thermoeconomic analyses of diesel engine powered cogeneration: Part 1 – Formulations

/kWh, 1.967