This master thesis examines adjustment of the heating system after refurbishment of the external thermal envelope of the building. It focuses on methodology, based on the adjustment of central-based heating system with radiators. With energy refurbishment of buildings, heating requirements are decreased. Existing radiators become oversized and heating water supply temperature or heating water mass flow can be reduced. The thermal power of radiators in individual rooms lowers unevenly which causes some limitations when decreasing the heating water supply temperature. Using a self-designed program within Microsoft Excel, we managed to determine the lowered heating water supply temperature and heating water mass flow temperature of an existing heating system. For chosen building with project temperature regime 90/70, the new heating water supply temperature is 46 °C. The calculated heating water mass flow, which the circulating pump must acquire, is 0,5248 kg/s.
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