Internal heat gain Lightning

Thermal power

CL BS EPG
ThisThe thermal power is the maximum amount of power of heat which is generated by lighting, expressed in W or W/m². When expressing the power in W/m², the gross surface area of the floor is taken into consideration. In this case the calculations are based on fixed wall dimensions, i.e. centre point dimensions excluding wall thicknesses. See Dimensions.
In the EPG calculations the thermal power of lighting is only taken into account if the project settings specify that lighting power needs to be considered in detail. In order to determine the lighting power in case of a flat rate method, the power is related to the functions of use inside the building.

•      Houses: no lights during daytime, 15 W / m² in living room and kitchen in the evening;

•      Schools: 10 W / m²;

•      Offices: guidelines for the power in m² are presented in the table below.

Presence detection

EPG
This option allows you to choose whether the lighting is controlled based on the presence and absence of people. An infrared sensor is used to detect any movement inside the room and to switch on the lights upon detected movement.

Illuminated ceiling

CL
This option allows you to choose whether the ceiling is illuminated. If so, the ceiling may accumulate radiant heat.

Lighting has air exhaust

CL BS EPG
This option allows you to apply exhaust to the luminaires using the ventilation system of the corresponding room. If this box has been checked, the heat gain may be reduced depending on the way of applying exhaust (position and type). Exhaust should be applied to at least 70% of the luminaires in the building (calculation zone) in an EPG calculation in order to appraise this in the EPC.

BS Lightning has air axhaust via armature and sceiling:         CF_l =0,68

Position

CL BS
This option only applies if the lighting has no air exhaust. Based on this position, a convection factor (CF_l) is determined..

Type

CL BS
This choice concerns the type of extract which is applied in case the lighting does have an air exhaust. A reduction factor is determined based on this choice and the flow rate.

•      Through plenum; extract is applied via the airless space in the lowered ceiling. This is the least efficient type of suction.

•      Through insulated duct; extract is applied via an insulated duct, to lead away as much heat as possible. This is the most efficient type of suction.

•      Through uninsulated duct; suction is applied via an uninsulated duct. A slight amount of heat will leak away through the duct into the room.

Flow rate

CL BS
The flow rate indicates the amount of air being sucked away per 100 W of installed power. This quantity may be a design requirement to be taken into account.

•      Flow rate of 20 m³ / h per 100W or 0.0056 m³ / s

•      Flow rate of 30 m³ / h per 100W or 0.0083 m³ / s

•      Flow rate of 50 m³ / h per 100W or 0.0140 m³ / s

•      Flow rate of 100 m³ / h per 100W or 0.0280 m³ / s

The contribution of the lighting to the cooling load is computed from the specified input according to a set of calculation rules, which can be found in the following standards:

Control

[keuze] BS EPG
The control affects the way the software deals with switching the lighting on and off.  This parameter does not affect the cooling load calculations.

§ Manual: no control is applied to the lighting.

§ Central control: the lighting system is switched on and off in the complete building

§ Sweep pulse: the corresponding lighting is switched off at predefined times using a sweep pulse.

§ Daylight control; the lighting in the building is controlled based on a light sensor measuring the amount of incoming light. The light sensor may be installed for each room or for each luminaire.

§ Sweep pulse and daylight: The lighting is switched off at specified times (e.g. during lunchtime) using a sweep pulse and simultaneously a light sensor is applied to measure the amount of incoming light on the surface.

§ Room control: the lighting is controlled for each room separately.

Room and facade control: this is equivalent to room control with an added option to control the facade separately.

BS In a building simulation the daylight is regulated based on the chosen control. If no daylight control was chosen, the lighting switches off when no people are present in the room / building. If a daylight scheme was chosen, the lighting is controlled in accordance the specified limits on the intensity of daylight on the facade.

EPG In determining the lighting power in an EPG calculation a distinction is made between the flat rate and detailed methods. In the former methods daylight control is not taken into account for determining the lighting power.

Daylight control

Only for (daylight) controls BS
This option allows you to choose whether the daylight control should only switch the lights on when it gets too dark outside and the lights have to be switched off manually, or whether the daylight control should both switch the lights on when it gets too dark outside and switch them off when it gets light outside. This entry only applies in case daylight control was chosen.

•      Only on; only control switching the lights on (which then keep burning the whole day)

•      On and off; control switching the lights both on and off

Intensity “on”

Standard 600 lux BS
This is the maximum intensity of the light outside at which the lighting inside should be switched on. This entry only applies to daylight control

Intensity “off”

Standard 1200 lux BS
This is the minimum intensity of the light outside at which the lights inside should be switched off. This entry only applies to daylight control which both controls switching the lights on and off.