1. Czech Technical University in Prague Faculty of Civil Engineering Department of Microenvironmental and Building Services Engineering Czech Technical University in Prague Faculty of Civil Engineering Department of Microenvironmental and Building Services Engineering Building Services Systems 20 Lecture 3 Heat load and consumption Lecture 3 Heat load and consumption

2. Heat loss calculation Preliminary heat loss calculation Preliminary heat loss calculation specific thermal consumption or envelope method specific thermal consumption or envelope method Used for preliminary boiler design Used for preliminary boiler design

3. ČSN EN 12831 Design heat load calculation Total heat load (W) Total heat load (W)  i =  T,i +  V,i  T,i ….. transmission  V,i …..ventilation

4. ČSN EN 12831 Simplified method Transmission Transmission Ventilation Ventilation Heating design load  HL =   T,i +   V,i +   RH,i (W)

5. Annual heat energy consumption Annual heat consumption Annual heat consumption Degree - day method Degree - day method

6. Minimizing of the energy consumption thermal insulation of the building envelope thermal insulation of the building envelope size and quality of the windows size and quality of the windows optimizing the ventilation rate (controlled ventilation?) optimizing the ventilation rate (controlled ventilation?) shape of the building shape of the building

7. Heating equipment Heat source - heat transfer medium - heat emitter Heat source - heat transfer medium - heat emitter Classification of the systems Classification of the systems local local floor floor central central district district