@article{huchtemann2013supply,
title={Simulation study on supply temperature optimization in domestic heat pump systems},
author={Huchtemann, K. and M{\"u}ller, D.},
volume={59},
ISSN={0360-1323},
url={https://www.sciencedirect.com/science/article/pii/S0360132312002405},
urldate={2023-12-17},
DOI={10.1016/j.buildenv.2012.08.030},
journal={Building and Environment},
publisher={Elsevier BV},
year={2013},
month={01},
pages={327--335},
annote={Quote: "In the case of retrofit, buildings are often equipped with radiator heating systems that need relatively high supply temperatures. This is one reason for low heat pump efficiencies. In Germany, the supply temperature of the heating system is normally controlled according to the ambient air temperature. It is set in a way that with nominal mass flow rate and temperature spread the chosen heating system delivers a heat flow that matches the room's heat load at the according ambient temperature. The heating curve usually is set once for nominal conditions when the heat generator system is installed. Thermostatic valves adapt the mass flow rate according to differing load conditions."  Quote: "... the nominal ambient temperature which lies between -16 and -12 {\degree}C in Germany ..."},
}