Abstract
The energy, exergy, thermoeconomic and sustainability analyses are applied to the building heating system with a natural gas-fired combi-boiler. The building area is considered as 90 m 2 . Furthermore, the design and analysis of the natural gas installation of the building are done. Two different methodologies (Fine-HVAC and LowEx analyses) are used for energy analyses (heat loss and demand) of the building. As a result, the energy efficiency of the building is found to be 29.451% using LowEx method. The exergy efficiency of the building is also calculated as 2.906%. The general energy and exergy efficiencies of the combi-boiler are determined to be 94.223% and 12.573%, respectively. Furthermore, it is found that the combi-boiler, which is used in the building as a heating system device, is approximately 11% more sustainable than the building, and thermoeconomic analysis is more beneficial when the exergetic rates are considered.
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