• Comparison of COP estimation methods for large-scale heat pumps used in energy planningPieper, Henrik; Ommen, Torben; Kjær Jensen, JonasEnergy2020 / art. 117994, 13 p. : ill https://doi.org/10.1016/j.energy.2020.117994
• Method of linear approximation of COP for heat pumps and chillers based on thermodynamic modelling and off-design operationPieper, Henrik; Krupenski, Igor; Markussen, Wiebke Brix; Ommen, Torben; Siirde, Andres; Volkova, AnnaEnergy2021 / art. 120743 : ill https://doi.org/10.1016/j.energy.2021.120743 https://www.scopus.com/sourceid/29348 https://www.scopus.com/record/display.uri?eid=2-s2.0-85107644419&origin=inward&txGid=0d829234dc6ef106832150c86771d264 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=ENERGY&year=2022 https://www.webofscience.com/wos/woscc/full-record/WOS:000662703200011