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Evaluation of solar heat source and sink in multi-functional heat pump operation.

Number: No 168

Author(s) : WEMHOENER C., BUESSER S., SCHWARZ R., ROMINGER L.

Summary

With increasing heat pump use, heat sources gain importance. For high performance, the heat source should deliver high temperature levels. Compared to outdoor, air solar installations like unglazed collector or photovoltaic/thermal installations can extract energy from the ambient air, but also yield higher temperatures at solar irradiation.To overcome cost barriers compared to cheaper outside air heat pumps, a multi-functional operation for direct solar space heating/domestic hot water (DHW) generation at high solar irradiation has advantages. During nighttime, also space cooling by heat rejection to the colder ambient temperatures/night sky can be provided which increases performance of the overall system by multi-functional integration.Test rig measurement of solar components as heat sink are evaluated and seasonal performance calculations are performed by simulation. Results indicate that in particular in buildings with higher space cooling and DHW shares, solar components can yield higher overall seasonal performance factors than outdoor-air heat pumps. Night cooling capacities can be enhanced by an evaporation on the collector, which also enables to vary surface properties to adapt to DHW production during daytime and space cooling during nighttime.

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Details

  • Original title: Evaluation of solar heat source and sink in multi-functional heat pump operation.
  • Record ID : 30030021
  • Languages: English
  • Subject: Technology
  • Source: 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
  • Publication date: 2021/08/31

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