1. Installation rules and guidelines
DGC Workshop GAHP March 28th
Luigi Tischer
Strategic Business Director Robur SpA

2. Keys for a proper design and installation
Hydraulics
Installation guidelines
Base load (peak Vs. backup) / Sizing
Weather curve
Applications with radiators
Series / parallel configurations
BMS/RB200
Case studies and experience

3. Hydraulics Flexible connections Pressure gages Regulation valve Filter
Isolation valves
Circulation pump
Relief valve
Expansion tank
Hydraulic separator / buffer tank
Secondary circuit
DDC / control

4. Anti-icing Threshold on water temperature
Threshold on outdoor air temperature
Two-steps control strategy:
Water circulation
Burner activation

5. Installation guidelines
Outdoor installation / air circulation
Water flow rate / circulation pumps
Buffer size / ON-OFF vs modulation (single unit / cascade)
DHW production / exchange surface
Sound
Load of the building / Weather curve / Return temperatures…

6. The behaviour of the building
Peak boiler (integration)
Vs.
Backup boiler (substitution)
Building load
[kW]
TOLEHP
TOLGAHP
Tbiv
Tdes
16 °C
Outdoor temperature [°C]

7. Weather compensation curve

8. The behaviour of the building
Qu = m*cp*(Tflow-Tret)
Tflow
RETURN TEMPERATURE
IS DECIDED BY THE BUILDING
65 °C Tm
Tret
55 °C Qu

9. The behaviour of radiators
According to EN442:
REDUCED TEMPERATURES
ARE POSSIBLE
ΔT = Tm - Ta
Ta (20°C)
Tinlet
Nominal ΔTn = 50 K
Tm = (Tinlet+Toutlet) / 2
Toutlet

10. Reducing thermal loads through interventions on the building envelope

11. Parallel configuration
GAHP
Boiler T

12. Series configuration Heat Pumps and Boilers Series Connection 75 °C
GAHP
Heat Pumps and Boilers Series Connection
75 °C
55 °C
65 °C

13. Heating only + DHW – control by BMS

14. Heating only + DHW – control by DDC + RB200

15. Heating only + DHW – control by DDC + RB200

16. GAHP Deep Retrofit example

17. GAHP: Historical Building example

18. E.ON monitoring

19. Thank you for your attention19