case study findings from a novel bems installation for small and temporary commercial buildings
TRANSCRIPT
TECHNICAL TEAM PROJECTS BRIEFING 20TH JANUARY 2016, MILTON KEYNES
MALCOLM HANNA TECHNICAL DIRECTOR
improving the use of energy in buildings
Case Study Findings from a Novel BEMS Installation for Small and
Temporary Commercial Buildings
EMEX: Technology & Innovation 16th November 2016
Dr Thomas Whiffen
THE ASSEMBLE PROJECT
• The project will develop a low cost, easy-to-
install energy management system for small
to medium size non-domestic premises.
• The system utilises the latest innovation in
power line carrier technology to enable low
disruption ‘plug and play’ installation.
• The bespoke user interface offers low energy
comfort, easily controllable on any internet
enabled device.
THE ASSEMBLE SYSTEM
TeroLight EM
Setup Interface
Control Interface
Monitoring Interface
CASE STUDY TRIALS
Temporary site office Small efficient office
COSTAIN TRIAL: LAYOUT
COSTAIN TRIAL: SETUP
COSTAIN TRIAL: PERIOD
Internal temperature 22.7°C 22.7°C
External temperature 20.5°C 20.2°C
Saved energy: 12.0 Wh/m2/day
(over six weeks period) (floor area: 933 m2)
Financial savings: £1.12 / day (over six weeks period) (based on 10 p/kWh)
29% AC savings
22% weekend use 6% weekday use
20th Jun – 31th Jul 2016 22th Aug – 2nd Oct 2016
Daily temperatures (t) averaged over the comparison period (taken at 12’o clock) and categorised as follows: COLD: t <9°C, COOL: t >9<14°C, MILD: t >14<19°C, WARM: t >19< 24°C, HOT: t >24°C
1,638
kWh
1,168
kWh
Before After
COSTAIN TRIAL: FINDINGS
COSTAIN TRIAL: HOW?
0
2
4
6
8
10
12
14
16
0007-14 AC (weekend) Before
After
Before After Savings
Total (shown weekend) energy use for 0007-14 AC unit (kWh) 20.56 kWh 0.58 kWh 97%
NEF TRIAL: LAYOUT
Uncontrolled (small offices) 102.5 m2
Controlled (main office) 307.5 m2
Mezzanine
Ground floor
NEF TRIAL: SETUP
NEF TRIAL: PERIOD
NEF TRIAL: FINDINGS
Before After
173 kWh
335 kWh
sunny: 28% sunny: 39%
light: 64% light: 61%
dark: 8% dark: 0%
Saved energy: 18.2 Wh/m2/day
(over one week period) (floor area: 308 m2)
Financial savings: £0.54 / day (over one week period) (based on 10 p/kWh)
48% lighting savings
Where: Dark equates to >3 hours of lux <25% from 8am till 7pm. Sunny equates to >7 hours of lux >45% from 8am till 7pm Light equates when neither of the above is applicable
NEF TRIAL: HOW?
0
15
30
45
60
75
0
200
400
600
800
1000
1200
1400
1600
1800
Lux,
%
Po
we
r, W
Lts A
Lts B
Lux
18-May Energy for lighting - 23.3 kWh
0
15
30
45
60
75
0
200
400
600
800
1000
1200
1400
1600
1800
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00
Lux,
%
Po
we
r, W
Lts A
Lts B
All off
Half off
Half on
All on
Lux
04-Aug Energy for lighting - 6.6 kWh
OVERALL SAVINGS
Total building(1) 302 £30.20 100% £28,177
kWh/m2/yr £/m2/yr(6) % £/yr(7)
Heating energy savings(2)
15.1 £1.51 5.0% £1,409
AC cooling energy savings(3)
10.0 £1.00 3.3% £933
Lighting energy savings(4)
10.4 £1.04 3.4% £971
Behaviour change savings(5)
15.1 £1.51 5.0% £1,409
Total savings 50.6 £5.06 16.8% £4,721
(1)Based on 100 W/m2, 12 hours a day, 252 days a year (Elliotts) (2)Estimated 5-7% heating savings from benchmark figures (BSRIA) (3)Based on Costain J34 summer trial findings and annual temperature profile (4)Based on NEF lighting trial findings and assumed illumination profile (5)Estimated 5-10% from literature (CTV023)
(6)Based on 10p/kWh (7)Based on the Costain J34 office floor area of 933 m2 (46 cabins)
FINDINGS
• Identified importance of robust comms. architecture
• Identified importance of engaging and maintaining
engagement of staff
• Configured set-points as required to optimising
conditions to staff desires
• Demonstrated capability to handle and find meaning
in big data
• Supported development of technology and business
case
• Gained soft acceptance of technology at NEF
