Matt Gitsham from Sustain Ltd gives some brilliant monitoring and measuring top tips about how to begin assessing your energy use and how simple changes can reduce energy consumption.

1. Matt Gitsham
Go Green 2015
Energy and
Resource
Efficiency

2. Whoarewe?
Drivers
- CO2
- Cost/Profit
- Brand Reputation
- Moral Obligation
- Government’s 80% 2050 obligation
Introduction

3. Data
Utility Bills
- Estimated VsActual

4. Data
Metering
- Water
- Gas
- Electricity
- Night time?
- Weekend?
- Summer/Winter?

5. Data
Metering
Converting Gas to kWh
ft3 m3
Units used
Imperial to metric x2.83 -
Volume correction x1.022 x1.022
Calorific Value x39.3 x39.3
KWh conversion ÷3.6 ÷3.6

6. Data
Benchmarking
- Gas
- Electricity
- Building Floor Area
Table 20.1 Fossil and electric building benchmarks - CIBSE Guide F
Building Type
Energy consumption benchmarks for existing buildings
Good Practice Typical Practice
Fossil Fuels Electricity Fossil Fuels Electricity
kWh/m2 kWh/m2 kWh/m2 kWh/m2
Catering
Fast Food 480 820 670 890
Restaurants (with bar) 1100 650 1250 730
Education (further/higher)
Lecture room, arts 100 67 120 76
Halls of residence 240 85 290 100
Education (schools)
Primary 113 22 164 32
Secondary 108 25 144 33
Hospital
Teaching and specialist 339 86 411 122
Hotel
Holiday 260 80 400 140
Industrial Building
Post 1995, >5000m2 96
Office
Air conditioned, standard 97 128 178 226
Naturally ventilated, cellular 79 33 151 54
Naturally ventilated, open plan 79 54 151 85
Retail
Banks and Building Societies 63 71 98 101
Clothes Shops 65 234 108 287
Small food shops 80 400 100 500
Taken from CIBSE Guide F
Last published 2012

7. Data
Benchmarking
- Gas
- Electricity
- Building Floor Area
Table 20.1 Fossil and electric building benchmarks - CIBSE Guide F
Building Type
Energy consumption benchmarks for existing buildings
Good Practice Typical Practice
Fossil Fuels Electricity Fossil Fuels Electricity
kWh/m2 kWh/m2 kWh/m2 kWh/m2
Catering
Fast Food 480 820 670 890
Restaurants (with bar) 1100 650 1250 730
Education (further/higher)
Lecture room, arts 100 67 120 76
Halls of residence 240 85 290 100
Education (schools)
Primary 113 22 164 32
Secondary 108 25 144 33
Hospital
Teaching and specialist 339 86 411 122
Hotel
Holiday 260 80 400 140
Industrial Building
Post 1995, >5000m2 96
Office
Air conditioned, standard 97 128 178 226
Naturally ventilated, cellular 79 33 151 54
Naturally ventilated, open plan 79 54 151 85
Retail
Banks and Building Societies 63 71 98 101
Clothes Shops 65 234 108 287
Small food shops 80 400 100 500
Taken from CIBSE Guide F
Last published 2012
0.193
0.519
0
0.1
0.2
0.3
0.4
0.5
0.6
Gas Electric
kg CO2 per kWh

8. Water
Carbon Footprint for Bristol Water
to deliver water and treat sewage 0.4 kg CO2/m3
=
Carbon Footprint to heat water to
45oC using electricity 21.1 kg CO2/m3
=
50x
Carbon Footprint heat water to
45oC using gas 9.6 kg CO2/m3
=
22x
Data

9. Water
Carbon Footprint for Bristol Water
to deliver water and treat sewage 0.4 kg CO2/m3
=
Carbon Footprint to heat water to
45oC using electricity 21.1 kg CO2/m3
=
50x
Carbon Footprint heat water to
45oC using gas 9.6 kg CO2/m3
=
22x
0.4
9.6
22
0
5
10
15
20
25
Cold Water Gas Hot Water Electric Hot Water
Water kg CO2 per m3
Data

10. Water
Did you know?
1 litre of hot water from the
kitchen/bathroom hot tap generates 50x
as much CO2 as 1 litre of cold water.
1 litre of boiling water from the instant
water boiler generates 130x as much
CO2 as 1 litre of cold water.
Save Carbon, try to use cold water
whenever possible.
Data

11. - Energy Manager
- Dress for the weather
- Controls:
- Set Point Temperatures
- Time Clock
- Dead Band
Immediate Payback
Immediate Payback
- Energy Manager
- Dress for the weather

12. Short Payback
Short Payback – Building Fabric
Cavity Wall Solid Wall

13. Short Payback
Short Payback - Pipework

14. Short Payback
Short Payback - Pipework

15. Our business
Short Payback – Task Lighting
Short Payback

16. Our business
Short Payback – Task Lighting
2268
450
30
0
500
1000
1500
2000
2500
Fixed Lighting Predicted Task
Lighting
Actual Task
Lighting
kWh per year
Short Payback

17. Our business
Long Payback - Lighting
- Audit – 12 W/m2 = good performance
- Automatic Controls
Light Number
Electricity
demand (kW)
Hours used
per day
Days
per year kWh/year
T8 strip light 23 0.054 8 250 2,484
Long Payback

18. Our business
Long Payback - Lighting
- Audit – 12 W/m2 = good performance
- Automatic Controls
Light Number
Electricity
demand (kW)
Hours used
per day
Days
per year kWh/year
T8 strip light 23 0.054 8 250 2,484
Long Payback

19. Our businessLong Payback
Long Payback – Major Plant
Replacement
- Heating
- Hot Water
- Chiller /AC

20. Our business
Micro Business – is this you?
Either:
- Use less than 100,000 kWh of electricity a year
Or:
- Use less than 293,000 kWh of gas a year
Or:
- Have fewer than 10 employees (or their full-time
equivalent) and your yearly turnover, or yearly
balance sheet, is not more than 2 million Euros.
Then get in touch! - £6k grant available

21. Thank You
Electricity
Matt Gitsham
Senior Associate
Matthew.Gitsham@sustain.co.uk
01934 864 831
www.sustain.co.uk