Installation rules and guidelines DGC Workshop GAHP March 28th - 2014 Luigi Tischer Strategic Business Director Robur SpA

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

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

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

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…

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

Weather compensation curve

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

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

Reducing thermal loads through interventions on the building envelope

Parallel configuration GAHP Boiler T

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

Heating only + DHW – control by BMS

Heating only + DHW – control by DDC + RB200

Heating only + DHW – control by DDC + RB200

GAHP Deep Retrofit example

GAHP: Historical Building example

E.ON monitoring

Thank you for your attention 19