Heat pumps in subarctic areas: current status and benefits of use in Iceland

Abstract

Heat pumps use the temperature difference between inside and outside areas to modify a refrigerant, either for heating or cooling. Doing so can lower the need for external heating energy for a household to some extent. The eventual impact depends on various factors, such as the external source for heating or cooling and the temperature difference. The use of heat pumps, and eventual benefits has not been studied in the context of subarctic areas, such as in Iceland. In Iceland, only remote areas do not have access to district heating from geothermal energy where households may, therefore, benefit from using heat pumps. It is the intent of this study to explore the observed benefits of using heat pumps in Iceland, both financially and energetically. This study further elaborates on incentives provided by the Icelandic government. Real data were gathered from the Icelandic energy authority for the analysis. It was found for the study database of 128 households that the annual electricity use was reduced from 37.8 to 26.7 kWh (an average 29.3% reduction) after installation of heat pumps. Large pumps (9.0-14.4 kW) and small pumps (5.0-9.0 kW) saved an average of 31.4 and 26.0% (95% confidence intervals), respectively. On average, households used approximately 26 MWh after installing a heat pump. When installing a small pump (5-9 kW), the mean annual saving (and 95% confidence intervals) was 10.6 (AE2.7) MWh (approximately 26%). However, when installing a larger pump, mean annual savings were 11.3 (AE1.6) MWh (Approximately 31%).

Study of the Distribution of Air Temperature in a Greenhouse Heated by Air to Air Heat Pump

“…With the rise of energy costs and technological advancements, heat pumps are now being reconsidered as an alternative heating system [5]. The efficiency of heat pumps in subarctic areas are stated in [6].…”

Heat pumps in Ontario

“…Heat pumps, and specifically ASHPs, are becoming more capable and efficient. A study of 128 heat pumps installed in Icelandic homes found an energy savings of approximately 30% annually [4]. Average temperatures in Reykjavik are a few degrees Celsius warmer than those in Windsor or Toronto, Ontario [4,16].…”

“…A study of 128 heat pumps installed in Icelandic homes found an energy savings of approximately 30% annually [4]. Average temperatures in Reykjavik are a few degrees Celsius warmer than those in Windsor or Toronto, Ontario [4,16]. ASHPs studied in Alaska were found to require backup heating only at very low temperatures and to have operating ranges extending to − 27 • C [56].…”