pv journal spoke with Tim Riedel, who owns a 24 kW residential rooftop PV system and a 12.86 kW air-source warmth pump, in regards to the return on funding for air-source warmth pumps and the financial savings households can obtain by pairing of this in PV.
Germany is contemplating banning new gasoline and oil heaters from 2024. This has sparked discussions in regards to the potential of warmth pumps to compete economically with gasoline heating and the position of PV in lowering electrical energy payments. Though simulation information on the return on funding of warmth pumps and their symbiotic relationship with rooftop PV is plentiful, area information is harder to acquire.
In an interview with pv journal, Tim Riedel, a sustainability guide at Berlin-based Planetgroups, shared information from a warmth pump and PV system put in in his single-family home in Germany. Riedel put in an air-source warmth pump system in its listed constructing from 1796 on February 24, 2022, consisting of an exterior warmth pump unit with a heating output of as much as 12.86 kW, a 170-liter sizzling water storage tank, and a smaller indoor unit for water heating positioned within the basement of the property.
Between Could and October, the primary warmth pump just isn’t lively. Riedel mentioned, “we simply use much less to warmth the water,” which is more cost effective and extends the lifetime of the bigger unit. The warmth pump system has a complete value of €31,000, together with set up companies. It qualifies for a €10,500 subsidy from Germany’s warmth pump rebate scheme, bringing the value right down to €20,500.
Riedel’s property gasoline consumption in 2021 amounted to twenty,000 kWh, whereas the warmth pump’s electrical energy consumption between April 1, 2022, and March 31, 2023, was 4,009 kWh. At an electrical energy value of €0.53/kWh and a gasoline value of €0.18/kWh, the warmth pump system leads to financial savings of €1,595 per yr. The Riedel household additionally has a 24 kW PV system put in on their rooftop, which produces 19.000 kWh of electrical energy a yr and leads to annual financial savings of €2,256 in comparison with heating with gasoline.
The warmth pump system exhibits a seasonal coefficient of efficiency (SCOP) of 5, as a result of its annual heating output of about 20,000 kWh and electrical energy consumption of 4,009 kWh. The SCOP reported within the datasheet is 4.53. Concerning chilly climate efficiency, Riedel says he solely seen a lack of effectivity when the surface temperature was decrease than -3 C. On days when the surface temperature reached -10 C, the system warmth pump “blows plenty of electrical energy.”
Riedel famous that Germany solely experiences such situations for a short while every year. “Persons are not very risk-averse, they purchase their gear as if they should survive the North Pole winter. What they do not know is that we now have one or two weeks of very chilly climate in Germany each winter .
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