Four years monitoring of heat pump, solar thermal and PV system in two net-zero energy multi-family buildings

This work presents four-year monitoring results of two new multi-family houses in Innsbruck aiming to be net-zero energy buildings (NZEB). The project combines high-performance designed Passive House standard, highly-efficient HVAC systems i.e., low-temperature distribution and emission, a double-stage ground-water source heat pump including desuperheater mechanical ventilation with recovery, maximum possible renewable sources roofs fully covered photovoltaic panels (PV) solar thermal collectors. design goal NZEB was balance on an annual basis, the electricity consumption technical production PVs, later evaluation by means campaign. With combination technologies respect building envelope, HVAC, renewables, measured onsite produced PV is 6% (4-year average) higher than one consumed pump. However, it not sufficient cover all (auxiliary appliances). Concerning quality recommended, concerning complex configuration seems beneficial practice there no clear indication benefit implementing this project. Solar collectors 20% more per unit area PV-driven pump, however, both corresponding system complexity tends show negative aspects, thus, decision should taken care. Finally, could shown that reducing losses minimization auxiliary energies major importance reach NZEB.