Earth Notes: General Bibliography (miara2021renovated)

• [miara2021renovated] Marek Miara Does a house have to be renovated first in order to install a heat pump? (accessed 2023-03-30), 2021-02 (www) (BibTeX).
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  [Quote: "For various reasons, (full) refurbishment of buildings is sometimes not possible in the short term. Fortunately, houses do not have to be extensively renovated in order to allow for an installation of a heat pump." Quote: "A very recent evaluation of 20 air-to-water heat pump systems, continuously monitored by Fraunhofer ISE, has shown the following: The average outdoor air temperature for the evaluated heat pump systems was -3.6°C during this very cold period (there have only been 5 months with average temperatures below -3.5°C in Germany in the last 50 years). The efficiency of 17 systems (the three best in fully renovated buildings were not taken into account) was 2.3 during this period, with a range between 1.6 and 2.8. That is to say: even with such cold weather, more than twice as much heat could be extracted from the ambient air with each kilowatt-hour of electricity. The device with the lowest efficiency had to operate with the lowest average outside air temperature of -10.2°C. Additional electric back-up heaters were used in only five plants and were taken into account when determining efficiency. The desired heating energy was provided by all plants."]