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Energy and efficiency analysis of heat pump systems in non-residential buildings by means of long-term measurements.

Number: pap. n. 158

Author(s) : WINIGER S., KALZ D., SONNTAG M., et al.

Summary

This paper presents a cross-comparison of 10 ground-coupled heat-pump systems installed in different non-residential buildings. The analysis is based on high-quality measurement data collected with high temporal resolution over several years of operation. The measured seasonal performance factors (heat pump with compressor and primary pump) are between 2.9 and 5.7 kWhtherm/kWhel in heating mode, 2.2 to 16.5 kWh(therm)/kWhel when using direct cooling and 4.8 to 5.8 kWhtherm/kWhel in active cooling. Crucial design factors are the auxiliary energy demand of the primary pump as well as the supply temperature for the distribution systems. Good efficiencies can be reached when using heat-pump systems in combination with direct cooling, waste-heat-recovery and distribution systems which permit supply temperatures near room temperature (16 to 20°C in cooling mode, 28 to 33°C in heating mode). The analyzed heat pumps typically start up to 20 times per day and then operate for a time span of 20 to 80 minutes before they turn off again (heating mode).

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Pages: 8 p.

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Details

  • Original title: Energy and efficiency analysis of heat pump systems in non-residential buildings by means of long-term measurements.
  • Record ID : 30008749
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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