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Module 3. Ground Source Heat Pumps. Plan. Intro: Why and what is a Ground Source Heat Pump (GSHP)? Advantages of GSHPs How a fridge works? How a liqui/water heat pump works? Works Co-efficient of preformance (COP) Effficiencies Sizing Futher information Micro CHP.

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module 3

Module 3

Ground Source Heat Pumps

www.sara-project.net

slide2
Plan

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • Intro: Why and what is a Ground Source Heat Pump (GSHP)?
  • Advantages of GSHPs
  • How a fridge works?
  • How a liqui/water heat pump works?
  • Works
  • Co-efficient of preformance (COP)
  • Effficiencies
  • Sizing
  • Futher information
  • Micro CHP
why ground source heat pumps
Why Ground Source Heat Pumps ?

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • Relies on fairly constant temperature of the ground
  • Can be used for heating and cooling
  • High capital costs, very low running costs
slide4
Ground and Air Temperatures

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

Source: Geoscience

what is a ground source heat pumps
What is a Ground Source Heat Pumps ?

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

advantages of gshps
Advantages of GSHPs

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • high reliability (few moving parts, no exposure to weather)
  • high security (no visible external components to be damaged or vandalised)
  • long life expectancy (typically 20-25 years and up to 50 years for the ground coil)
  • low noise
  • low maintenance costs (no regular servicing requirements)
  • no boiler or fuel tank
  • no combustion or explosive gases within the building
  • no flue or ventilation requirements
  • no local pollution.
how a fridge works
How a fridge works

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

Diagram: BBT Thermotechnology UK

how a liquid water heat pump works
How a liquid/water heat pump works

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

Diagram: BBT Thermotechnology UK

ground source heat pumps
Ground Source Heat Pumps

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • Horizontal collectors can be less expensive to install but require an area of approximately 120-150% of the floor area to be heated
  • Capital cost around EUR 6 000 per household (depending on civils)
slide10
A Typical drilling rig for a borehole based GSHP installation

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

Photo: Geoscience

slide11
Trench for a ground loop heat exchanger

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

Photo:

Geoscience

co efficient of performance cop
Co-efficient of Performance (COP)

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

efficiencies
Efficiencies

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • Heat pump efficiencies improve as the temperature differential between ‘source’ and demand temperature decreases
  • Therefore a low temperature heat distribution system is required
slide14
Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

BRE Good Practice Guide 339

sizing
Sizing

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • Crucial to operation
  • Energy efficiency very important
  • Usually designed to meet 50% of peak demand and 80-85% of heat demand over the year
  • Usually pre-heats hot water, electrical immersion heater used for top up heating
further information
Further Information

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • IEA Heat Pump Centre www.heatpumpcentre.org
  • Canadian Earth Energy Association www.earthenergy.ca
  • www.earthenergy.co.uk
micro chp
Micro CHP

Sustainable Architecture Applied to Replicable Public Access Buildings

www.sara-project.net

Contract:TREN/04/FP6EN/S07.31838/503118

  • CHP (Combined Heat and Power)
  • Replaces gas boiler and also produces electricity
  • Whispergen
    • £3000 + VAT
    • Available from Powergen in East Anglia, East Midlands, Yorkshire, the North West and London regions
    • £150 savings per year (EST report, 3-4 bedroom house)
    • CO2 savings of 1.5 tonnes a year
    • Floor mounted, against an outside wall
  • Microgen
    • Similar system, to be launched in the UK in 2007
  • Further info at www.chpa.co.uk
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