21 April 2008
The USA have been the leaders in the
adoption of seasonal energy effi ciency
indices for air-to-air units, in cooling
and in heating modes, recently
followed by Japan, Korea and China
(IPLV for package units).
Since seasonal performance indices
allow the effect of temperature variations
and heating load variations on
performance to be included, they are
likely to give a better indication of the
real effi ciency of the products in the
fi eld than do present EER and COP
fi gures at full load under rated conditions.
At least, this enhances the comparison
of the energy performances
of different products by taking more
variables into account.