Exhaust air heat pump connection schemes and balanced heat recovery ventilation effect on district heat energy use and return temperatureThalfeldt, Martin; Kurnitski, Jarek; Latõšov, EduardApplied thermal engineering2018 / p. 402-414 : ill https://doi.org/10.1016/j.applthermaleng.2017.09.033 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS