switching from oil or electricity to a ground source heat pump saves an average of 62 percent of the energy. But there are large differences between different systems show a large field test from the Swedish Energy Agency.
test, which is the largest field test of geothermal heat pumps in Sweden, was performed in 20 families in West Bengal during the period May 2012 to May 2013.
results show that changing the heating system from oil or electricity to geothermal heating saves an average of 62 percent of the energy. But there are large differences between different systems. Energy savings ranged from 70 percent at best 48 percent at worst.
According Energy Agency explains the differences among other things, how well the heat pump is matched to the heating system and the installation itself.
measurements show that the hot water is approximately the same throughout the year. There were big differences between how much the different families used to heat and how much went to the hot water in the taps.
Because a heat pump, generally speaking, are not as effective when it produces hot water goes in many cases to save energy by, for example revise their shower habits.
test shows that the frequency and duration of showering are more important for hot water use than how many people live in the house.
A detailed table of the various houses that were included in the test can be found here.
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