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Borehole installations or air to water heat pumps. What to use and where.

Sistemi sa bušotinama ili toplotne pumpe vazduh-voda. Koje rešenje koristiti i na kojoj lokaciji.

Author(s) : NIELSEN G.

Summary

The use of boreholes as a low temperature heat source is spreading rapidly in Norway. There seems to be very little critical thinking whether this is an investment worthwhile or not. On the west coast of Norway we see a rapid build-up of numbers of borehole based heat pump installations, even though the climate is generally mild, and the winters usually are rather wet and grey, than crisp and white, due to the passing warm Gulf current. The typical west coast situation is an annual mean temperature of 7°C to 8°C and a design outdoor temperature of -9°C to -14°C. Even for Tromsø, as far north as 69°, with a design outdoor temperature of -15°C and an annual mean temperature of 3.4°C, there should be doubts whether borehole or air should be used as the low temperature heat source. However the use of air as heat source poses some challenges, with regard to design, especially in connection with defrosting and varying evaporation temperature. In this paper a comparison of the energy- and economic efficiency of bore-hole and air to water heat pump systems, located in Bergen, Karasjok, Oslo, Røros, and Tromsø is presented. The systems are calculated using two types and brands of reciprocating compressors and one screw compressor.

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Pages: 16 p.

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Details

  • Original title: Sistemi sa bušotinama ili toplotne pumpe vazduh-voda. Koje rešenje koristiti i na kojoj lokaciji.
  • Record ID : 30020210
  • Languages: English
  • Source: 47th International HVAC&R Congress and Exhibition.
  • Publication date: 2016/12

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