Oxford Civic Society 24 September 2011 - oxcivicsoc.org.uk · Oxford Civic Society – 24 September...

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micro-renewable solutions for a sustainable future

Micro-renewable energy

Martin Brook – Ecoliving Oxfordshire

Oxford Civic Society – 24 September 2011


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A look at our motivations


Financial reality

• We live in the real world, it has to work financially

Emotional – living with it

• This is the “gut feel” of what’s right, what can I be proud of?

Energy sustainability

• The need to meet our energy demands in a long-term sustainable way.

Carbon reduction

• The need to reduce carbon in our atmosphere


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UK CO2 Emissions


28.9% (138 million tonnes)

from energy we use to

heat, light and power our

homes


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Typical energy use in the home


Space Heating 30,000 kWh / year

Hot Water 5000 kWh / year

Lighting

Cooking 5000 kWh / year

Appliances


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Two types of energy


Heat Power

Easier to store Difficult to store

Difficult to export Easy to export

Use it or lose it Use it or share it

Difficult to convert Easy to convert to

to power heat

The main sources of renewable energy applicable to homes & businesses.


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Renewable Energy


Solar PV – Electricity

Solar Thermal – Hot water

Biomass Wind turbine

Heat Pumps are Solar, not

geo-thermal.

Logs & Wood

pellets

RENEWABLE HEAT POTENTIAL

• Dec 2008 – David Mackay in his book “Sustainable

Energy” (From Oct 2009 – DECC’s Chief Scientific Advisor)

"For forest-dwellers, there’s wood. For everyone else, there’s heat pumps. We should replace all our fossil-fuel heaters

with electric-powered heat pumps”

• March 2011 - Chris Huhne, Energy Minister

“Renewable heat is a largely untapped resource

and an important new green industry for the future”


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A look at some technologies


Heat Pumps

Heat Recovery Ventilation

Biomass

Solar Thermal

Solar PV

Wind

Most of us have a heat pump already

We just call it

a fridge


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How a Heat Pump Works -1

START

Evaporator

Compressor Condenser

Expansion Valve


Heating water

Refrigerent

Collector


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How a

Heat Pump

Works - 2


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Different Types of Heat Pump


Ground Source Heat Pump

Air Source Heat Pump

Exhaust Air Heat Pump

(Ventilation)


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Ground Source Heat Pump



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Recent Projects

– Ground Source Heat Pump



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Air Source Heat Pump

Operates to -20°C

Positioning of the unit is important

– cold air & sound


Heating and

Hot Water


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Recent Projects

– Air Source Heat Pump



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Heat Recovery Heating &

Ventilation

A Must in New Homes


The heat exchanger delivers a

healthy indoor climate.

SICK BUILDING SYNDROME


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Heat Pumps - benefits

Predictable, constant heat all year around

Reduced running costs

(by up to 70% compared to oil /electricity)

More comfortable indoor climate

Docks with other renewables


HEAT LOSS


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CO2 Savings

Solar PV 4 Kw system - 1500 kg per year


GSHP vs GAS - 1330 kg per year

GSHP vs OIL - 5636 kg per year

GSHP vs ELECTRIC - 14280 kg per year


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Heat Recovery Ventilation

Heat Exchanger


A heat exchanger ensures that one

complete air change is achieved

every 2 hours

Providing pre-warmed, filtered fresh air

Reduces energy bills

Inhibits moisture and mould

• Biomass refers to organic material such as timber or crops grown to be burned in order to produce heat and/or power.

• Burning wood is carbon neutral since the CO2 released when burning is equal to the CO2 absorbed during growth.


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Biomass

Wood log boiler

Heats up a large

volume of water to use

for a few days

More space required


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Biomass

Wood Pellet boiler

Works ‘on demand’ in

the same way as a

‘conventional’ boiler.

More space required


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Biomass


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Creating a focal point and delivering

space heating on the coldest days of

the year.

Output 3 - 7 kW

Efficiency < 80%

Wood-burning Stoves


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Solar thermal panels on the roof.

‘Free hot water’……………

Eco warrior vs Payback warrior

Solar Thermal

- Domestic Hot Water


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Solar PV

System

Solar Photovoltaic

- On-site Microgeneration

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• The UK has 40% of Europe’s total wind energy

• Suitable in many situations

• Siting is important • 100m from building recommended

• Shadow Flicker

• Planning Permission


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Wind


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Essentials….


Energy Efficiency

Heating – R. H. I.

Electricity – F. I. T.


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Thank You for your

attention!

Martin.brook [email protected] www.ecolivinguk.com


Any questions? (No hard ones please)

Oxford Civic Society 24 September 2011 - oxcivicsoc.org.uk · Oxford Civic Society – 24 September...

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