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This thesis presents energy, exergy and economic analyses of the heating system of an existing building, the Konya Central Informatics Technical High School. The heat requirement for each room of the building is found by calculating heat losses. Radiator lengths that can provide the heat requirements are selected. For the exergy analysis, the system is divided into three parts: Heat generator, radiators and rooms. Comparisons are made according to minimum outdoor temperature, insulation quality of the structural elements, fuel type, heating water temperature and heat generator type (boiler, heat pump, cogeneration unit with heat pump) to see their effects on energy usage, exergy consumption, capital costs and annual operating cost of the system. Results show that the largest heat loss is due to infiltration but it should not be reduced because of the fresh air requirement. Minimum energy usage, exergy consumptions and annual operating cost is achieved by using the cogeneration unit with the heat pump. However, due to high capital cost it has a long payback period (45.3 years). The shortest payback period (3.2 years) is calculated for upgrading the windows to 4 mm double glass panes and 12 mm stagnant air gap. |
