This tab deals with Part L data at the building level (as distinct from data describing individual rooms or constructions).

Part L distinguishes between various building types. The choices are:

Dwelling – requires analysis by Part L1

Dwelling extension – a category within Part L1 (not currently supported)

Residential building – a category within Part L2 (ADL2 Table 2)

Office – a category within Part L2 (ADL2 Table 2, paragraph 1.62 (CPR Method) & paragraph 1.70 - Whole-building Method)

Place of assembly or shop – a category within Part L2 (ADL2 Table 2).

Industrial or storage building – a category within Part L2 (ADL2 Table 2)

School – a category within Part L2 (ADL2 paragraph 1.72 - Whole-building Method)

Hospital – a category within Part L2 (ADL2 paragraph 1.72 - Whole-building Method)

Other – not eligible for Part L2 Whole-building Method (ADL2 paragraph 1.70)

Indicate whether the building is new or existing. An existing building may have a less stringent CPR target for air-conditioning and mechanical ventilation in the L2 Elemental Method. Where alterations are made to the fabric of existing buildings, existing elements that are not subject to alteration may not need to comply with the standards of the current regulations. However, the software currently applies the same checks to all elements.

This tab contains data describing the dwelling’s heating system. This data is used by all three L1 methods, with the exception of data fields appearing in green, which are used only by the Carbon Index (SAP) Method. All other Part L1 tabs are used exclusively by the Carbon Index Method.

This tab provides access to the Boiler Efficiency Database maintained by DEFRA. This database is updated on the first day of each month and the latest version may be downloaded from www.boilers.org.uk. The database file, ‘bedf.dat’, should be placed in the folder ‘IES\apps\Regs’.

The type of system providing space-heating in the dwelling. The options (underlined) are the system types appearing in SAP^[8] Table 4a. Depending on the heating system selected, further data fields are presented, as shown below beneath each option:

Select a central heating system type:

Click on a radio button to indicate the source of the boiler efficiency data:

– to take efficiency and other data from this table

Boiler type (2 fields) – select options to describe the gas/oil boiler for SAP Table 4b

Boiler type (2 fields) – select options to describe the gas/oil boiler for SAP Table 4b

Enter manufacturer’s efficiency? – tick this box to override the SAP Table 4b efficiency

– to take efficiency and other data from the boiler database

Select from database – accesses the boiler database allowing you to select a boiler

Detail – displays the detailed parameters for the selected boiler

These options are used to calculate the Adjusted Efficiency (SAP Table 4c).

Low temperature distribution system – select an option for SAP Table 4c

Control system – select an option for SAP Table 4c

Heat emitter (SAP Table 4d) – select a type of heat emitter for SAP Table 4d

Solid fuel boiler

Solid fuel boiler type – select an option to describe the boiler for SAP Table 4a

Electric Boiler

Electric boiler type – select an option to describe the boiler for SAP Table 4a

Electric CPSU data (SAP Appendix F) – specify CPSU parameters where applicable for use in SAP Appendix F:

CPSU cylinder size (litres)

CPSU operating temperature (winter)

– select an option to describe the heat pump for SAP Table 4a

Select a community heating scheme type (determines the method used for the Carbon Index calculation):

CHP (includes instances where some heat is supplied from community boilers).

Recovered heat from power station (includes instances where some heat is supplied from community boilers) – treated differently from CHP in Carbon Index calculation.

Community boilers  (without any CHP or recovered heat component) – treated with a dedicated section of the SAP worksheet. With this option the parameter ‘Fraction of heat from CHP or fraction of heat recovered from power station’ on the SAP 9* & 10* Space-heating (community heating) tab should be set to 0.

Tariff – select Off-peak or 24-hour tariff for SAP Table 4a

Heater type – select a type of storage heater for SAP Table 4a

Air heating System - select a type of warm-air system for SAP Table 4a

Heater Type - Select a heater type for SAP Table 4a - add 40m3/s for each flueless gar fire if present

 

The boxes on this tab relate to those in Section 4 (Water-heating energy requirements, boxes 39-52), and Section 10 (Fuel costs, boxes, 88-100 and 89*-100*) of the SAP worksheet. For guidance, see Sections 4 and 10 of SAP 2001.

Indicate the system used to provide hot water. The options (with the exception of the first) are those appearing in SAP Table 4a under ‘HOT-WATER-ONLY HEATING SYSTEMS’, with ‘Independent electric water heating system’ expanded into ‘Immersion heater (single)’ and ‘Immersion heater (dual)’ to provide the input data required for SAP Table 13 or (in the case of heat pumps) SAP Appendix G:

Select this option if hot water is supplied by the space heating system, except in the case where space heating is provided by heat pumps.

Select this option or the following if space heating is provided by heat pumps.

Immersion heater (dual)

From a heat exchanger built into a gas warm-air system

Single-point gas water heater

Multi-point gas water heater

Water heating fuel

Select a fuel or electricity tariff to be used in SAP Table 12 or, in the case of heat pumps, SAP Appendix G. The fuel must be consistent with the water heating system.

This option is set automatically. If the heating system is set to COMMUNITY HEATING SCHEME and Water heating system (SAP Table 4a) is set to ‘Provided by space heating system (but not heat pumps)’, the box is ticked, with consequences for the calculations done in Section 4 of the SAP form.

If so, the following data must be entered to provide the data for boxes 41-42 of the SAP form:

Hot water storage volume (litres)

Hot water storage type (SAP Table 2) –

Is there a cylinder thermostat (SAP Table 2)?

Insulation thickness (mm) (SAP Table 2)

Area of solar panel (0 if none) (m²)

 

Primary circuit and keep-hot losses (SAP Tables 3 & 4f)

Water heating system type

Pick an appropriate category for SAP Table 3. If space heating is provided by heat pumps, the appropriate setting is ‘Electric immersion heater’.

 

For a combination boiler, enter the following data used in the section of SAP Table 3 labelled ‘Additional losses for combi boilers’, an in the section of SAP Table 4f labelled ‘Electricity for maintaining keep-hot facility of a gas combi boiler’:

Keep-hot facility type

Controlled by time clock?

Electric power rating (W) (0 if unknown)

The boxes on this tab relate to box 53a of Section 5 of the SAP worksheet: Additional gains from Table 5. For guidance, see Section 5 of SAP 2001.

– Tick if there is a central heating pump (does not apply to community heating)

– Tick if there are warm-air heating system fans (does not apply to community heating)

– Tick if there is a mechanical ventilation system (do not include if either of the two preceding boxes is ticked)

– Tick if there is an oil pump inside the dwelling and therefore contributing to heat gains

 

The boxes on this tab relate to Section 9 (Space-heating requirement, SAP boxes 81-87) and Section 10 (Fuel costs, SAP boxes 88-100) of the SAP worksheet, which apply if space and water heating is not provided by community heating. For guidance, see Sections 9 and 10 of SAP 2001.

The following provide the data for SAP Table 11 (Fraction of heat supplied by secondary heating system), SAP Table 4a (secondary system efficiency for SAP box 84) and the calculation of fuel costs in Section 10 of the SAP form. In the case of electric CPSUs, SAP Appendix F is used in place of Table 11.

– This field, which is used as input to SAP Table 11 (for SAP box 82) is set automatically from data entered on the Heating System tab, as follows:

When Heating system is ‘CENTRAL HEATING...’ or ‘WARM-AIR SYSTEM’, ‘Main system’ is set to ‘Boiler’, except where ‘Heating system type’ is ‘Heat pumps’, when the setting is ‘Heat pump’.

When Heating system is ‘STORAGE RADIATOR SYSTEM’, ‘Main system’ is set to ‘Fan assisted storage heaters’ or ‘Electric storage heaters not fan assisted’, depending on the Heater type.

When Heating system is ‘ROOM HEATER SYSTEM’, the ‘Main system’ setting depends on ‘Room heater system type’ and ‘Heater type’. When ‘Room heater system type’ is ‘Gas’, the setting is ‘Gas room heaters’. When ‘Room heater system type’ is ‘Solid Fuel’, and ‘Heater type’ is any of the options beginning ‘Open fire...’, the setting is ‘Coal fires or other electric systems’. In all other cases the setting is ‘Coal or electric room heater’.

When Heating system is ‘OTHER SPACE-HEATING SYSTEMS’ (which means Electric ceiling heating) ‘Main system’ is set to ‘Coal fires or other electric systems’

 

– select options from the two boxes describing any secondary heating system for SAP Table 11 and Table 4a (ROOM HEATER SYSTEMS)

Describe additional gains from SAP Table 4f for inclusion in SAP boxes 87a-87e:

–  tick if there is a central heating water pump, or a CPSU pump (see SAP Appendix F) or a heat pump (see SAP Appendix G)

  tick in the case of an oil boiler to allow for the oil pump and flue fan

–  tick in the case of a gas boiler with a fan-assisted flue

 

The boxes on this tab relate to ‘Section 9*’ (Space-heating requirement, SAP boxes 82*-88*), Section 10⁽*⁾ (Fuel costs, SAP boxes 88-100) of the SAP worksheet, which apply if space and water heating is provided by community heating. For guidance, see Sections 9 and 10 of SAP 2001.

Fuel data from this tab is also used in the sections of the SAP form headed ‘Carbon Index (CI) for individual and community heating without CHP’ and ‘Carbon Index (CI) for community heating schemes with CHP or heat recovered from power stations’.

Community heating schemes use heat from one or more of the following three sources: CHP, recovered heat from power stations, and community boilers.

 for SAP box 83*. The remaining fraction is assumed to be provided by community boilers.

– select an option for the specification of distribution loss factor in SAP box 85*

 identify the fuel used by community boilers (if present). In the case of community boilers supplementing CHP or heat recovered from power stations, this will be used to set carbon emission factors in the boxes to the left of SAP boxes 109* and 112*.  In the case of community heating without CHP or heat recovered from power stations, this setting is not used

The following fields apply only to community heating schemes using CHP:

Electrical efficiency of CHP unit (eg 0.3) – for SAP box 101*

Heat efficiency of CHP unit (eg 0.5) – for SAP box 102*

CHP fuel (SAP Table 15) – for SAP box 103*. Select a fuel for use in SAP Table 15: Carbon dioxide emission

CHP heat to power ratio (enter 0 if unknown) – for SAP box 106*