Transcript Time for the UK to Rediscover Underfloor Heating

Heat Pumps And Underfloor Heating – A Match Made In
Heaven?
THE NATIONAL ENERGY FOUNDATION
Ground Source Heat Pump Seminar
12th May 2005
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Introduction
• Steve Alldritt
Business Development Manager: Central Region
Uponor Housing Solutions Ltd
• Nick Wincott
Managing Director
Eastern Heat Pumps Incorporating
Screedmasters
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Who Are We????????
Uponor
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Net Sales Worldwide : 1.3 billion EUR
Sales to 100 countries worldwide
27 production sites in 13 countries
4800 employees
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Main Areas of Business
Heating & Cooling systems
indoor water systems (heating / potable)
Sewer & storm pipework
ground loop collector pipework
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Introduction
• Aims
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Explain how underfloor Heating works.
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Examine advantages & disadvantages UFH used with
GSHP
• Outcome
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Show how you and your clients can benefit from UFH &
GSHP
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Effect energy efficiency improvements
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HOW DO MODERN HEATING SYSTEMS WORK?
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What are we trying to achieve?
Radiator
Ideal
Underfloor
2,7 m
1,7 m
1,7 m
1,7 m
0,1 m
0,1 m
0,1 m
°C
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°C
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20
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°C
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20
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UFH is very close to the ideal temperature distribution
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How Does UFH Work?
Just like one big low temperature radiator
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General Control Principles
WTC Control
Box
Room
‘Stat
40°C
82°C
Primary Pump
Energy Source
72°C
Flow Detector
UFH Pump
Wirsbo
Underfloor
Heating
Min Flow
Bypass
35°C
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GSHP Control Principles
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1960’s Underfloor Heating
• Mainly electric cable in thick concrete floors
• Floor used as storage heater
• Poor controls
• Floors too hot (Uncomfortable)
• Inefficient (Generally poor insulation)
• Ineffective (Huge number of air changes)
• Ultimately unreliable (Expensive to run)
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Modern Underfloor Heating
• Mainly warm water
• High tech plastic pipe in or just below floor
• Water is 45-60OC
• Forms to suit most floor constructions
• Well proven controls
• Economical to run (Especially with GSHP)
• Reliable, long lasting
• Maintenance-free
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Underfloor Heating / GHSP Design Principles
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Ultimate performance from both systems
Perform Heat Loss Calculations
Match W/m2 from UFH with GSHP
Agree flow / return temps, depending on floor
constructions
• Agree control strategy (i.e individual room
temperature control)
• Tel the customer what we can give him!!!!
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Manifold cabinet & Thermostatic adjustment
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Solid Floor – 100 W/m2 max (40-45° Flow)
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Floor Cross Section
Carpet
Tile
Wood
Screed
Insulation
Over site
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Pipe set in place before screed is laid
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Pipe positioning plate
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Clip Rail
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Suspended Floor – 70 W/m2 max (50-55°C Flow)
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Unifoil System – 70 W/m2 (50-55°C Flow)
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Floating Floor – 70 W/m2 max (50-55°C Flow)
Final floor covering
14mm pipe
Heat emission plate
Floating floor panel
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Sports Hall
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Underfloor Heating / Cooling via GSHP
• Comfort cooling can be achieved by reverse
cycling GSHP
• Cooling outputs of approx. 40 W/m2
• Flow / Return temperatures of 10/15°C
• Dew point control to avoid ‘Wet Floors’
• Heating / Cooling changeover controls
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Underfloor Heating / Cooling Via GSHP
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Five Areas of Energy Saving with UFH
• No hot air in front of glass
= Less heat loss through window
• No hot air at ceiling level
= Less heat loss through ceiling & walls
• Lower air temperature for
same comfort
= Reduced number of air changes
• Uses lower water
temperature
= Lower transmission losses
• Options to use Ground
Source Heat Pumps
= Fuel saving economies
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Advantages of UFH / GSHP
• Very comfortable
– No ‘hot heads or cold feet’
– Does not promote floor draughts
– No drying of the air
– Reduced dust levels
– Beneficial to allergy sufferers, asthma etc
– Simplifies controls i.e. minimal mixing required
• Unobtrusive
– Walls left completely clear
– Floors and walls are easier to clean
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Other Advantages of UFH
• Quiet
– No creaks and groans, especially in solid floors
• Safe
– No hot surfaces - important to HSE
– No sharp edges to cause injury
– Ultimate low surface temperature radiator
– Nothing to vandalise
– In Sweden, only UFH is allowed, by law, in children's
nurseries
– Ultimate in ‘green’ energy
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Other Advantages of UFH
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Complements other aspects of heating
– Keeps options open for water heating
– heat pumps
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Cost effective installation
– Less damage & less pilferage
– Installable in most stages of the construction
process
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Lower running costs
– Low water temperature direct from GSHP
– Reduced installation problems
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BA Headquarters Heathrow
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Kingdom Hall
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Ancient manuscript archive
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Pizza Express Restaurant
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Why UFH / GSHP’s Relevant to You
• Improving building insulation standards leads to
reduced heating requirements
• EU regulations on energy efficiency and pollution
require low temperature emitters such as UFH
• Options are kept open for green energy sources
based on low temperatures (heat pumps)
The UK is now to rediscovering
Underfloor Heating
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Summary
Underfloor Heating today is:• clean and ‘green’
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comfortable
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invisible
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quiet
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safe
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energy-efficient
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maintenance-free
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UPONOR HOUSING SOLUTIONS LTD
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