Fraunhofer ISE presents the outcomes of the renovation of warmth pump installations in multi-family homes in Germany. A demonstrator exhibits rooftop photo voltaic PV and a multi-source warmth pump developed in collaboration with Viessmann. It makes use of wind and geothermal as the warmth supply.
Germany’s Fraunhofer ISE, Freiburg College, and the Karlsruhe Institute of Know-how (KIT) have developed options to retrofit warmth pumps, warmth switch programs, and air flow programs in multi-family houses as a part of the “LowEx within the Constructing Inventory” challenge. The staff additionally developed a multi-source warmth pump with Germany-based heating producer Viessmann. The machine makes use of wind and geothermal as warmth sources.
“In metropolis facilities, there’s often not sufficient area to drill boreholes for geothermal probes and utilizing exterior air as a warmth supply is comparatively ineffective and has greater noise emissions,” stated Fraunhofer ISE in a press release. “The multi-source warmth pump system combines the benefits of two warmth sources: exterior air and floor. With this mixture, a small drilling space is achieved regardless of the excessive effectivity of a brine warmth pump can nonetheless be achieved.
The researchers put in the answer in a 160-unit condo constructing in Karlsruhe-Durlach, Germany. The system is paired with a peak-load gasoline boiler and a 60 kW PV system on the constructing’s roof.
“To realize low CO2 warmth technology in these buildings, the warmth pumps are designed to have the best attainable protection fee with the gasoline boiler working occasionally,” stated Fraunhofer.
Within the first six months of operation, between February and July 2022, the multi-source warmth pump achieved a supply temperature of 8 C on common, in accordance with Fraunhofer ISE. Its coefficient of efficiency (COP) on the time was reported to be 3.2. The gasoline boiler accounted for 31% of the warmth provided to the constructing. That is “primarily because of the excessive temperature necessities for hygienic home scorching water,” the analysis institute claims. Total, the retrofit system decreased carbon dioxide emissions by 42%.
“The demonstrator multifamily homes on this challenge show the potential of retrofitting multifamily homes with warmth pumps and low exergy applied sciences,” stated Manuel Lämmle, a researcher from the College of Freiburg. .
“To realize the most effective operation, it is very important think about the given state of affairs, together with the warmth distribution programs and the quantity of area within the heating cellar,” he stated. “Throughout the retrofit, it is usually essential to make a hydraulic steadiness of the heating system and verify if the circulate temperatures might be additional decreased, for instance, by changing particular person radiators.”
The challenge contains different technological developments akin to hybrid warmth pumps, warmth pumps with propane as refrigerant, and high-temperature warmth pumps. Different know-how companions embody German producers Bosch, Beck+Heun, and Kermi.
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