Part L – The Directors Cut
Fagerhult Lighting – 24 February 2011
Liz Peck MS c MS LL
• Part L
– Who d e cid e s the m
– 201 0 in d e tail
– Flaws
– Am b igu ity
• E ne rgy Is sue s
• The Future
Building Regulations
• U K G ove rnm e nt
– S e cre tary of S tate
• Bu ild ing Act 1 984
• (b) furthe ring the conse rvation of fue l and powe r
• D e partm e nt of C om m unitie s and Local
G ove rnm e nt (D C LG )
• www.com m unitie s .gov.uk
Part L Documents
Part L2 : Non-Domes tic
Part L2 : Lighting efficacy
Part L2 : Controls
* Local Manual: Distance from switch to luminaire <6m or twice room heightWindow luminaires should be switched separately
Cell Office
Open Plan
Meeting Room
Store / WC
Corridor
Retail
Part L2 : Enhanced Controls
Part L2 : Metering
Part L2 : F laws
• O ffice , Ind ustrial, S torage
– T5 lum inaire
• 60 Llm /cW
– E m pty O ffice at 2am
• Manual switch le ft on
PART L2 COMPLIANT !!
Part L2 : F laws
• G e ne ral Are as
– T5 lam ps
• 80-1 00 lm /W
– Black box
• LO R 0%
PART L2 COMPLIANT !!
Part L2 : Ambiguity
Energy Is s ues
(b) furthering the conservation of fuel and power…
Dwindling Energy S upplies
Why S ave Energy?
Carbon Reduction Commitment
• 80% re d uction in C O2 by 2050
– 66% of 2050 bu ild ing s tock alre ad y e xis ts
– 26 m illion bu ild ings e xis t tod ay
– 1 8 m illion will ne e d re furb is hm e nt
– 500,000 e ve ry ye ar
50 buildings every hour
LENI (EN15193)
• L ighting
• Ene rgy
• Num e ric
• Ind icator
kWh/m /year ²
LENI (EN15193)
• Ins talle d powe r
• Paras itic powe r
• Lighting controls
• D aylight contribution
• O pe rating hours
• U se ful floor space
LENI (EN 15193)
LENI = W ( total power consumed in kWh)
A ( total us eful floor area in m2)
Note : W = WL (lighting load) + WP (parasitic load)
WL = {(Pn x FC) x [(tD x FO x FD) + (tN x FO)]} / 1000
WP = {{PPC x [ty – (tD + tN)]} + (Pem x te)} / 1000
Lighting Load
• PN Total power of the illumination luminaires [W]
• A Area under cons ideration [m2]
• FC Maintenance link for cons tant illuminance benefit factor
• FD Daylight link benefit factor
• FO Abs ence link benefit factor absence during operating time
• tD Operating time with daylight availability [hrs ]
• tN Operating time with no daylight availability [hrs ]
Paras itic Load
• Pem Total charge power for emergency lighting luminaires [W]
• PPC Total s tandby power for the lighting controls [W]
• te Operating time for charging emergency lighting batteries
[hrs ]
• ty S tandard hours in a year [8760 hrs ]
Tertiary Lighting S ectors
• O ffice
• Ind ustrial
• H e althcare
• E d ucation
• R e tail
• S port
Be nchm arking
E stim ation
Valid ation
Lighting for People
The right l ight
In the right place
At the right time
Thank you
Top Related