PartL ROI: General Tab

Setting	Description
HWS	The Hot Water System specifications are set here. DHW system - Up to 20 different DHW systems can be defined. Each room is associated with a DHW system. Each DHW system has a set of data to define the system. Description – Each DHW system has a unique name. Generator type – Select the type of DHW generator, this selection includes using the same heat generator as the heating system. Fuel type – Select the Fuel type from list. Later than 1988 – For boiler systems installed from 1998 onwards, a default seasonal efficiency of 0.81 is suggested by the tool (based on Statutory Instrument 1994 No. 3083), and for boiler systems installed before this period, a conservative default seasonal efficiency of 0.65 is suggested. Please note that from around 1989, the boiler industry began producing boilers with efficiencies that would have complied with the above statutory instrument. Generator seasonal efficiency – The generator seasonal efficiency can be specified, or a default value can be used. Storage system – A hot water storage system can be specified. If the Storage volume (litres) and the Storage losses (MJ/month) are known, they can defined, otherwise a default will be used. Secondary circulation – If there is secondary circulation with the DHW system it can be specified. If the Circulation losses (W/m), Pump power (kW) and the pipe Loop length (metres) are known, they can be defined, otherwise a default will be used. Time control can also be specified for the secondary circulation. If the Storage system or the Secondary circulation system are set to use defaults, the program will fill in the data based on the defaults used by SBEMie. The Bi-valent systems section allows a bivalent HWS system to be setup. This is when the heating is supplied by two or more different types of heat sources.
SES	The Solar Energy System specifications are set here. System - Up to 20 different SES systems can be defined. The following data must be defined for each SES system. DHW system - Each SES system must be designated to a DHW system so that the specific energy saving due to solar power can be correctly counted. Description – Each SES system has a unique name. Area – Solar panel area (m²) Inclination – Select nearest inclination angle from the list. Orientation – Select the nearest orientation from the list. Multiplier – Several identical solar panels can be specified, all being designated to the DHW system.
Wind generator, PVS and Solar Collectors	The Wind generator specifications are set here. System - Up to 20 different wind generators can be defined. Each wind generator has a set of data associated with it. Description - Each wind generator has a unique name. Terrain type - Indicates the type of terrain around the generator. Power - Used to define delivered electrical power at rated wind speed. Hub height - Used to enter turbine hub height. Multiplier - Several identical wind generators can be specified. The Swept area of the wind turbine is used to calculate the area of air intercepted by the turbine rotor. Axial horizontal wind turbines, enter the rotor diameter in m. The swept area is automatically calculated as the area of the circle delineated by the turbine's blades. For any other type of wind turbines including vertical axis wind turbines enter the turbine rotor swept area, in m². The Solar collectors contains already defined solar collectors, assigned if the room is served by solar collectors. The Photo-voltaic systems specifications are set here. System - Up to 20 different PVS systems can be defined. Each PVS system has a set of data associated with it. Description – Used to define name. Each PVS system has a unique name. Peak power – If the peak power for the PV array is known it can be entered here otherwise the type and area need to be entered. Type – Used to select the type of module technology used in this PV panel. Area – Used to enter Photovoltaic panel area, excluding the supporting construction. Inclination – Select nearest inclination angle from the list. Orientation –Select the nearest orientation from the list. Multiplier – Several identical photovoltaic panels can be specified, all being designated to the DHW system. Overshading – This refers to the percentage of the sky that is blocked by obstacles. Ventilation strategy – This refers to the types ventilation between the PV module and its mounting surface.
CHP, District Heating and Air Conditioning	CHP generator - If the System uses CHP check box has been checked for the heating system, CHP generator data can be defined. The following data is defined for a CHP generator. Fuel type – Select from the list. Heat efficiency – Used to enter value of the heat efficiency of the CHP generator. Electrical efficiency – Used to enter value of the electrical efficiency of the CHP generator. Building space heat supplied – Used to enter value of the proportion of space heating supplied to the building by the CHP generator (%). Building hot water supplied – Used to enter value of the proportion of DHW supplied to the building by the CHP generator (%). CHPQA quality index – Used to enter value of the annual useful heat supplied by the CHP generator divided by the annual electricity generated (ratio). Air conditioning inspection - This data is used for reporting purposing and is not used in the calculation. If the Building has an air conditioning system the following can be entered: A/c rating - If this is know it can be entered otherwise the estimated rating should be set. Estimated rating – If the actual rating is unknown then an estimated range should be set. Inspection status – The current status of the air conditioning inspection should be specified. District heating - The CO₂ emission factor for district heating should reflect the average annual efficiency and fuel mix of the whole district heating system. It should include all heat generating plant, including any CHP, any waste heat recovery or heat dumping, the effect of heat losses in distribution (external to the building), the emissions from electricity used for pumping, and any other relevant carbon dioxide emissions. This option is only available if district heating has been selected on any of the currently selected HVAC system.
Other	Power factor and Lighting controls Electric power factor – This is a measure of the actual electric power consumption to that usually measured by the electric metre. Lighting control – This gives a 5% controls correction to the lighting system is both options are specified. LENI Calculation - Specifies whether a calculation following the Lighting Energy Numerical Indicator (LENI) method has been carried out for the building as an alternative to complying with the lighting efficacy standards specified in the Non-Domestic Building Services Compliance Guide. Ground floor U values - If the U value of the ground floors have been modified in accordance to BR 443:2006, this needs to be specified. If the U values have not been modified then SBEMie will perform the modification. Centre lines - Typically DDB rooms are entered using the internal edge of all room surfaces. The NCM modelling guide defines the floor area of the zone to be calculated using the internal horizontal dimensions between the internal surfaces of the external zone walls and half-way through the thickness of the internal zone walls. Selecting this option will prevent this program from adjusting the room area to account for the thickness of the partition surfaces.

HWS

The Hot Water System specifications are set here.

DHW system - Up to 20 different DHW systems can be defined. Each room is associated with a DHW system. Each DHW system has a set of data to define the system.
Description – Each DHW system has a unique name.
Generator type – Select the type of DHW generator, this selection includes using the same heat generator as the heating system.
Fuel type – Select the Fuel type from list.
Later than 1988 – For boiler systems installed from 1998 onwards, a default seasonal efficiency of 0.81 is suggested by the tool (based on Statutory Instrument 1994 No. 3083), and for boiler systems installed before this period, a conservative default seasonal efficiency of 0.65 is suggested. Please note that from around 1989, the boiler industry began producing boilers with efficiencies that would have complied with the above statutory instrument.
Generator seasonal efficiency – The generator seasonal efficiency can be specified, or a default value can be used.

Storage system – A hot water storage system can be specified. If the Storage volume (litres) and the Storage losses (MJ/month) are known, they can defined, otherwise a default will be used.

Secondary circulation – If there is secondary circulation with the DHW system it can be specified. If the Circulation losses (W/m), Pump power (kW) and the pipe Loop length (metres) are known, they can be defined, otherwise a default will be used. Time control can also be specified for the secondary circulation.

If the Storage system or the Secondary circulation system are set to use defaults, the program will fill in the data based on the defaults used by SBEMie.

The Bi-valent systems section allows a bivalent HWS system to be setup. This is when the heating is supplied by two or more different types of heat sources.

SES

The Solar Energy System specifications are set here.

System - Up to 20 different SES systems can be defined. The following data must be defined for each SES system.
DHW system - Each SES system must be designated to a DHW system so that the specific energy saving due to solar power can be correctly counted.
Description – Each SES system has a unique name.
Area – Solar panel area (m²)
Inclination – Select nearest inclination angle from the list.
Orientation – Select the nearest orientation from the list.
Multiplier – Several identical solar panels can be specified, all being designated to the DHW system.

Wind generator, PVS and Solar Collectors

The Wind generator specifications are set here.

System - Up to 20 different wind generators can be defined. Each wind generator has a set of data associated with it.
Description - Each wind generator has a unique name.
Terrain type - Indicates the type of terrain around the generator.
Power - Used to define delivered electrical power at rated wind speed.
Hub height - Used to enter turbine hub height.
Multiplier - Several identical wind generators can be specified.

The Swept area of the wind turbine is used to calculate the area of air intercepted by the turbine rotor.

Axial horizontal wind turbines, enter the rotor diameter in m. The swept area is automatically calculated as the area of the circle delineated by the turbine's blades.
For any other type of wind turbines including vertical axis wind turbines enter the turbine rotor swept area, in m².

The Solar collectors contains already defined solar collectors, assigned if the room is served by solar collectors.

The Photo-voltaic systems specifications are set here.

System - Up to 20 different PVS systems can be defined. Each PVS system has a set of data associated with it.
Description – Used to define name. Each PVS system has a unique name.
Peak power – If the peak power for the PV array is known it can be entered here otherwise the type and area need to be entered.
Type – Used to select the type of module technology used in this PV panel.
Area – Used to enter Photovoltaic panel area, excluding the supporting construction.
Inclination – Select nearest inclination angle from the list.
Orientation –Select the nearest orientation from the list.
Multiplier – Several identical photovoltaic panels can be specified, all being designated to the DHW system.
Overshading – This refers to the percentage of the sky that is blocked by obstacles.
Ventilation strategy – This refers to the types ventilation between the PV module and its mounting surface.

CHP, District Heating and Air Conditioning

CHP generator - If the System uses CHP check box has been checked for the heating system, CHP generator data can be defined. The following data is defined for a CHP generator.

Fuel type – Select from the list.
Heat efficiency – Used to enter value of the heat efficiency of the CHP generator.
Electrical efficiency – Used to enter value of the electrical efficiency of the CHP generator.
Building space heat supplied – Used to enter value of the proportion of space heating supplied to the building by the CHP generator (%).
Building hot water supplied – Used to enter value of the proportion of DHW supplied to the building by the CHP generator (%).
CHPQA quality index – Used to enter value of the annual useful heat supplied by the CHP generator divided by the annual electricity generated (ratio).

Air conditioning inspection - This data is used for reporting purposing and is not used in the calculation.

If the Building has an air conditioning system the following can be entered:

A/c rating - If this is know it can be entered otherwise the estimated rating should be set.
Estimated rating – If the actual rating is unknown then an estimated range should be set.
Inspection status – The current status of the air conditioning inspection should be specified.

District heating - The CO₂ emission factor for district heating should reflect the average annual efficiency and fuel mix of the whole district heating system. It should include all heat generating plant, including any CHP, any waste heat recovery or heat dumping, the effect of heat losses in distribution (external to the building), the emissions from electricity used for pumping, and any other relevant carbon dioxide emissions. This option is only available if district heating has been selected on any of the currently selected HVAC system.

Other

Power factor and Lighting controls

Electric power factor – This is a measure of the actual electric power consumption to that usually measured by the electric metre.
Lighting control – This gives a 5% controls correction to the lighting system is both options are specified.

LENI Calculation - Specifies whether a calculation following the Lighting Energy Numerical Indicator (LENI) method has been carried out for the building as an alternative to complying with the lighting efficacy standards specified in the Non-Domestic Building Services Compliance Guide.

Ground floor U values - If the U value of the ground floors have been modified in accordance to BR 443:2006, this needs to be specified. If the U values have not been modified then SBEMie will perform the modification.

Centre lines - Typically DDB rooms are entered using the internal edge of all room surfaces. The NCM modelling guide defines the floor area of the zone to be calculated using the internal horizontal dimensions between the internal surfaces of the external zone walls and half-way through the thickness of the internal zone walls.

Selecting this option will prevent this program from adjusting the room area to account for the thickness of the partition surfaces.