UK: Mitsubishi Electric’s Ecodan air source heat pump is said to have shown better efficiency than a gas condensing boiler in year-long trials.
Estimated carbon emission savings of 21%, 41% and 67%, respectively, were also demonstrated and the EST report also shows that after future grid decarbonisation, these carbon savings rise to 85% over gas and 88% over oil.
The EU defines the renewable threshold as an average seasonal performance of 2.5, when measured against reduced boundary conditions covering the performance of the heat pump in isolation (known as SPFH2).
SPFH4 conditions widen the monitoring by including all auxiliary power consumption and this gives a much clearer indication of overall system performance. 15 of the Ecodan sites also achieved an SPFH4 average of 2.98 across the winter of 2011-2012 – one of the coldest on record for decades, and seven of the sites achieved an average of 3.04.
“These tests measured all auxiliary power consumption as well as that of the heat pump itself so it gives a much more accurate indication of the overall performance,” explains John Kellett, general manager of Mitsubishi Electric’s Ecodan heating range.