Özet:

In this study, waste heat loss of flue gases from the boilers in Kafkas University district heating system has calculated between 6-8% according to the combustion analysis and annual cost of this heat loss has found as $58,658.79. In terms of energy efficiency and national economy, it has thought that this lost heat should recover as much as possible and fuel and energy savings should be achieved. The effects of variants such as air excess coefficient, flue gas temperature, boiler capacity and fuel consumption on the heat recovery from flue gas have presented in detail. The heat recovery scenarios have presented for reusing this waste energy for the space heating, domestic hot water, preheating combustion air and applicability of these scenarios has been investigated in terms of thermodynamics and economics. In the second scenario examined to cover the domestic hot water need of the guest house building, the energy savings of the scenario will provide during 20 years of economic's life is $122,820.83, and it has the highest savings income among the scenarios. In addition, it is possible to recover approximately 50% of the flue gas loss with thanks to the scenario. On the other hand, the third scenario of heating the boiler combustion air with waste heat is the easiest and most economical scenario because its payback period is only one year, and there are no extra excavation and pipe costs.

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