Division 5 Specific conditions for seasonal space heating energy efficiency

The seasonal space heating energy efficiency of all local space heaters except commercial local space heaters is defined as:

η_S = η_S,on – 10 % + F(1) + F(2) + F(3) – F(4) – F(5)

The seasonal space heating energy efficiency of commercial local space heaters is defined as:

η_S = η_S,on – F(1) – F(4) – F(5)

Where:

• η_S,on is the seasonal space heating energy efficiency in active mode, expressed in %, calculated as set out in point 5(b);

• F(1) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency of electric storage local space heaters due to adjusted contributions for options for heat storage and output; and a negative contribution to seasonal space heating efficiency for commercial local space heaters due to adjusted contributions for options for the heat output, expressed in %;

• F(2) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency due to adjusted contributions of controls of indoor heating comfort, the values of which are mutually exclusive, cannot be added to each other, expressed in %;

• F(3) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency due to adjusted contributions of controls for indoor heating comfort the values of which can be added to each other, expressed in %;

• F(4) is a correction factor accounting for a negative contribution to the seasonal space heating energy efficiency by auxiliary electricity consumption, expressed in %;

• F(5) is a correction factor accounting for a negative contribution to the seasonal space heating energy efficiency by energy consumption of a permanent pilot flame, expressed in %.

The seasonal space heating energy efficiency in active mode is calculated as:

For all local space heaters except electric local space heaters and commercial local space heaters:

η_S,on = η_th,nom

Where:

• η_th,nom is the useful efficiency at nominal heat output, based on NCV.

For electric local space heaters:

$${\eta }_{\mathrm{S,on}}=\frac{1}{\mathrm{CC}}\times {\eta }_{\mathrm{th,on}}$$

Where:

• CC is the electric to primary energy ‘conversion coefficient’.

• η_th,on for electric local space heaters is 100 %.

For commercial local space heaters:

η_S,on = η_S,th · η_S,RF

Where:

• η_S,th is the weighted thermal efficiency, expressed in %;

• η_S,RF is the emission efficiency, expressed in %.

For luminous local space heaters, η_S,th is 85,6 %;

For tube local space heaters:

η_S,th = (0,15 · η_th,nom + 0,85 · η_th,min ) – F_env

Where:

• η_th,nom is the useful efficiency at nominal heat output, expressed in %, based on GCV;

• η_th,min is the useful efficiency at minimum heat output, expressed in %, based on GCV.

• F_env are the envelope losses of the heat generator, expressed in %;

If the heat generator of the tube local space heater is specified by the manufacturer or by the supplier to be installed in the indoor space to be heated, the envelope losses are 0 (zero).

If the heat generator of the tube local space heater is specified by the manufacturer or by the supplier to be installed outside the heated area, the envelope loss factor depends on the thermal transmittance of the envelope of the heat generator according to Table 4.

The emission efficiency of commercial local space heaters is calculated as follows:

$${\eta }_{\mathrm{S,RF}}=\frac{\left(\mathrm{0,94}\times {\mathrm{RF}}_S\right)+\mathrm{0,19}}{\left(\mathrm{0,46}\times {\mathrm{RF}}_S\right)+\mathrm{0,45}}$$

Where:

• RF_S is the radiant factor of the commercial local space heater, expressed in %.

For all commercial local space heaters except tube systems:

RF_S = 0,15 · RF_nom + 0,85 · RF_min

Where:

• RF_nom , is the radiant factor at nominal heat output, expressed in %;

• RF_min , is the radiant factor at minimum heat output, expressed in %.

For tube systems:

$${\mathrm{RF}}_S=\sum _{i=1}^n\left(\mathrm{0,15}\times {\mathrm{RF}}_{\mathrm{nom,i}}+\mathrm{0,85}\times {\mathrm{RF}}_{\mathrm{min,i}}\right)\times \frac{P_{\mathrm{heater,i}}}{P_{\mathrm{system}}}$$

Where:

• RF_nom,i , is the radiant factor per tube segment at nominal heat output, expressed in %;

• RF_min,i , is the radiant factor per tube segment at minimum heat output, expressed in %;

• P_heater,i , is the heat output per tube segment, expressed in kW, based on GCV;

• P_system , is the heat output of the complete tube system, expressed in kW, based on GCV.

The above equation only applies if the construction of the burner, tubes and reflectors of the tube segment as applied in the tube system is identical to a single tube local space heater and the settings that determine the performance of a the tube segment are identical to those of a single tube local space heater.

The correction factor F(1) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for heat input and output and if the heat is distributed through natural or fan assisted convection for electric storage local space heaters and a negative contribution for commercial local space heaters related to the capability of the product of regulating its heat output.

For electric storage local space heaters the heat output correction factor F(1) is calculated as follows:

In case the product is equipped with one of the (mutually exclusive) options shown in table 5, the correction factor F(1) shall be increased with the corresponding value of that option.

In case the heat output of the electric storage local space heater is assisted by a fan, an additional 1,5 % shall be added to F(1).

For commercial local space heaters the heat output correction factor is calculated as follows:

The minimum value of the correction factor F(1) for two stage commercial local space heaters is 2,5 %, and for modulating commercial local space heaters is 5 %.

For local space heaters not being electric storage heaters or commercial local space heaters the correction factor F(1) shall be 0 (zero).

The correction factor F(2) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for indoor heating comfort, the values of which are mutually exclusive or cannot be added to each other, is calculated as follows:

For all local space heaters the correction factor F(2) is equal to one of the factors according to Table 7, depending on which control characteristic applies. Only one value can be selected.

The F(2) correction factor does not apply to commercial local space heaters.

The correction factor F(3) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for indoor heating comfort, the values of which can be added to each other, is calculated as follows:

For all local space heaters the correction factor F(3) is the summation of the values according to Table 8, depending on which control characteristic(s) applies.

The auxiliary electricity use correction factor F(4) is calculated as:

This correction factor takes into account the auxiliary electricity use during on-mode and standby-mode operation.

For electric local space heaters the correction is calculated as follows:

The auxiliary electricity use correction factor F(4) is calculated as:

$$F\left(4\right)=\mathrm{CC}\times \frac{\alpha \times {\mathrm{el}}_{\mathrm{sb}}}{P_{\mathrm{nom}}}\times 100\left[\%\right]$$

Where:

• el_sb is the standby electric power consumption, expressed in kW;

• P_nom is the nominal heat output of the product, expressed in kW;

• α is a factor taking into account whether the product complies with Commission Regulation (EC) No 1275/2008^f1:

  • if the product complies with the limit values set in Regulation (EC) No 1275/2008, α is by default 0 (zero),

  • if the product does not comply with the limit values set in Regulation (EC) No 1275/2008, α is by default 1,3.

For local space heaters using gaseous or liquid fuels the auxiliary electricity use correction is calculated as follows:

$$F\left(4\right)=\mathrm{CC}\times \frac{\mathrm{0,2}\times {\mathrm{el}}_{\max }+\mathrm{0,8}\times {\mathrm{el}}_{\min }+\mathrm{1,3}\times {\mathrm{el}}_{\mathrm{sb}}}{P_{\mathrm{nom}}}\times 100\left[\%\right]$$

Where:

• el_max is the electric power consumption at nominal heat output, expressed in kW;

• el_min is the electric power consumption at minimum heat output, expressed in kW. In case the product does not offer a minimum heat output the value for the electric power consumption at nominal heat output shall be used;

• el_sb is the electric power consumption of the product while in standby mode, expressed in kW;

• P_nom is the nominal heat output of the product, expressed in kW.

For commercial local space heaters the auxiliary electricity use correction factor is calculated as follows:

$$F\left(4\right)=\mathrm{CC}\times \frac{\mathrm{0,15}\times {\mathrm{el}}_{\max }+\mathrm{0,85}\times {\mathrm{el}}_{\min }+\mathrm{1,3}\times {\mathrm{el}}_{\mathrm{sb}}}{P_{\mathrm{nom}}}\times 100\left[\%\right]$$

The correction factor F(5) related to the energy consumption of a permanent pilot flame is calculated as follows:

This correction factor takes into account the permanent pilot flame power requirement.

For local space heaters using gaseous or liquid fuels it is calculated as:

$$F\left(5\right)=\mathrm{0,5}\times \frac{P_{\mathrm{pilot}}}{P_{\mathrm{nom}}}\times 100\left[\%\right]$$

Where:

• P_pilot is the pilot flame consumption, expressed in kW;

• P_nom is the nominal heat output of the product, expressed in kW.

For commercial local space heaters the correction factor is calculated as:

$$F\left(5\right)=4\times \frac{P_{\mathrm{pilot}}}{P_{\mathrm{nom}}}\times 100\left[\%\right]$$

In case the product has no permanent pilot light (flame) P_pilot is 0 (zero).

Where:

• P_pilot is the pilot flame consumption, expressed in kW;

• P_nom is the nominal heat output of the product, expressed in kW.