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Division 3 Seasonal space heating energy efficiency of warm air heaters:

United Kingdom

Original text. Later amendments are not shown.

  1. (a)

    The seasonal space heating energy efficiency ηs,h shall be calculated as the seasonal space heating energy efficiency in active mode ηs,on which includes consideration of the seasonal thermal energy efficiency ηs,th , the envelope loss factor Fenv and the emission efficiency ηs,flow , corrected by contributions accounting for heat output control, auxiliary electricity consumption, vented flue losses and ignition burner power consumption Pign (if applicable).

Notes on Annex III

Footnotes

f1

The wet bulb temperature condition is not required when testing units which do not evaporate condensate.

f2

For units designed for heating and cooling mode, the flow rate obtained during the test at standard rating conditions in cooling mode is used.

f3

Outlet temperatures dependent on water flow rate as determined at standard rating conditions (100 % part load ratio when cooling, 88 % when heating)

f4

With the water flow rate determined during ‘A’ test for units with a fixed water flow rate or with a variable flow rate.

f5

With the water flow rate determined during ‘A’ test for units with a fixed water flow rate or with a variable flow rate.