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Fraunhofer ISE, Viessman develop multi-source residential heat pump – pv magazine International


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 Expertise (KIT) have developed options to retrofit warmth pumps, warmth switch techniques, and air flow techniques in multi-family houses as a part of the “LowEx within the Constructing Inventory” undertaking. The crew has additionally developed a multi-source warmth pump with Germany-based heating producer Viessmann. The system makes use of wind and geothermal as warmth sources.

“In metropolis facilities, there may be normally not sufficient house to drill boreholes for geothermal probes and utilizing outdoors air as a warmth supply is comparatively ineffective and has larger noise emissions,” mentioned Fraunhofer ISE in an announcement. “The multi-source warmth pump system combines some great benefits of two sources of warmth: the surface air and the bottom. With this mix, a small drilling space is achieved however 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 doable protection price with the gasoline boiler working sometimes,” mentioned 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 response to Fraunhofer ISE. Its coefficient of efficiency (COP) at the moment was reported to be 3.2. The gasoline boiler accounted for 31% of the warmth provided to the constructing. That is “primarily as a result of excessive temperature necessities for hygienic home scorching water,” the analysis institute claims. General, the retrofit system lowered carbon dioxide emissions by 42%.

“The demonstrator multifamily homes on this undertaking show the potential of retrofitting multifamily homes with warmth pumps and low exergy applied sciences,” mentioned Manuel Lämmle, a researcher from the College of Freiburg. .

“To realize one of the best operation, it is very important take into account the given scenario, together with the warmth distribution techniques and the quantity of house within the heating cellar,” he mentioned. “Through the retrofit, it is usually essential to make a hydraulic steadiness of the heating system and test if the stream temperatures might be additional lowered, for instance, by changing particular person radiators.”

The undertaking consists of different technological developments resembling hybrid warmth pumps, warmth pumps with propane as refrigerant, and high-temperature warmth pumps. Different expertise companions embody German producers Bosch, Beck+Heun, and Kermi.

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