RESIDENTIAL HEATING & COOLING SEMINAR
AN INTRODUCTION TO TEMPERATURE CONTROL SYSTEMS
www.rehau.co.uk
Building
Automotive
Industry
SPEAKER AGENDA–
09.00 – 09.30
09.30 – 10.00
10.00 – 10.30
10.30 – 11.00
11.00 – 11.30
11.20 – 12.00
12.00 – 13.30
TONY HARBOUR, Technical Specifications Manager, REHAU Ltd.
RICK HUTCHINSON, Business Development Manager, MITSUBISHI Electric Europe B.V.
PAUL HEATLEY, Area Sales Manager, KAHRS Flooring
COFFEE / TEA Break
GARY AKERS, Technical Manager, St George West London
WILL GOLD, Design Engineer, REHAU Ltd.
Q&A session and Networking Lunch
RESIDENTIAL HEATING & COOLING SEMINAR
AN INTRODUCTION TO TEMPERATURE CONTROL SYSTEMS
www.rehau.co.uk
Building
Automotive
Industry
REHAU SURFACE HEATING & COOLING TECHNOLOGY
AN INTRODUCTION TO TEMPERATURE CONTROL SYSTEMS
www.rehau.co.uk
Building
Automotive
Industry
LEARNING OBJECTIVES
AGENDA
• About REHAU
• The UK UFH market
• Introduction to Underfloor Heating & Cooling
• Control Options
• Floor types
• PE-Xa pipe
© REHAU
REHAU COMPANY HISTORY
UK LOCATIONS
Private Company
-
1948 Founded in the Bavarian town of REHAU
1962 First UK Sales Office and Warehouse
opened in Slough
1975 First Manufacturing Plant was opened in
Amlwch
1995 Opening of the new headquarters in
Ross-on-Wye
2012 REHAU celebrated its 50th anniversary
trading in the UK
© REHAU
REHAU WORLDWIDE
THINK GLOBALLY – ACT LOCALLY
6 CONTINENTS
174 LOCATIONS
OVER 15,000 EMPLOYEES
© REHAU
REHAU DIVISIONS
UNLIMITED POLYMER SOLUTIONS
Industry
FURNITURE, HOUSEHOLD APPLIANCES,
HOSES AND INDUSTRIAL DEVELOPEMENTS
Automotive
EXTERIOR, WATER MANAGEMENT, AIR
MANAGEMENT & SEALING
Building
Solutions
WINDOW
AND
CURTAIN
WALLING
TECHNOLOGY, BUILDING TECHNOLOGY,
CIVIL ENGINEERING
© REHAU
UNDERFLOOR HEATING AND COOLING
THE UK UNDERFLOOR HEATING MARKET
• Wet & Electric UFH included
• Market grown since 2009
• 5% of the UK heating market
• £78m value in 2011
• Est. £90m value by 2016
• Non-domestic projects account
for 51% share
• Emphasis on small flats &
apartments (49% share)
• UFH can create up to 15%
more space in the property
© REHAU
UNDERFLOOR HEATING AND COOLING
ENERGY REQUIREMENTS
•
Energy requirements of a UK home can typically come from 40-50
W/m²
•
Average family home (120-160m² ) requires 6-7kW
•
Optimum flow temperature for heating from heat pumps (≈ 35-40°C)
•
Optimum flow temperature for cooling is ≈ 16°C, possible to obtain
cooling directly from primary ground-source circuit, i.e. simple pump
(no heat pump)
© REHAU
UNDERFLOOR HEATING AND COOLING
BUILDING REGULATIONS – DOMESTIC HEATING COMPLIANCE GUIDE
Domestic Heating Compliance Guide
- System temperature controls
- High limit thermostat
- Room temperature control
- Temperature control for each room
- Weather compensating controls should be installed
- Time control
- Dwellings with total usable area up to 150m²
- Dwellings with total usable area > 150m²
- Boiler control
- Boiler interlock
- SAP rating
© REHAU
UNDERFLOOR HEATING AND COOLING
BASIC PRINCIPLES
Modes of heat transfer from human body
© REHAU
UNDERFLOOR HEATING AND COOLING
BASIC PRINCIPLES
Thermal Comfort / Radiant Heat
Underfloor
heating
Radiators
Radiation
60 %
30 %
Convection
40%
70 %
*
Convection
Radiation
Thermal comfort
Since majority of the heat lost from the human body is due to Radiation, the comfort level derived from
Floor Heating is greater than by Convection, due to the heat lost from the human body being replaced
in the same way
*
Source: BSRIA APPLICATION GUIDE AG 12/2001
© REHAU
UNDERFLOOR HEATING AND COOLING
TEMPERATURE PROFILES
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM INSTALLATION
- Prepare Building
- Fit Edge Insulation
- Lay Floor Insulation
- Tape Joints
- Tape Edge Insulation
- Site Manifold
- Lay Circuit
- Reverse Spiral
- Fill / flush
- Pressurise to 6 Bar
© REHAU
UNDERFLOOR HEATING AND COOLING
BENEFITS OF UNDERFLOOR HEATING
•
Same comfort level at lower room temperatures
> 15% to 30% potential saving in fuel costs*
•
Reduces wasted heat at ceiling height
> lower heat load
•
Large heat emitter reduces heating water temperature
> compatible with heat pumps / solar etc.
•
Vertical temperature profile close to ideal profile
> increased comfort level
•
Even spread of heat across complete floor
> high comfort level
•
Silent and invisible heating system
> high comfort level
•
Air movement at a minimum
> allergy friendly
•
No radiator grills
> freedom in space design & safe
•
Virtually maintenance free system
> no downtime
•
No ventilation shafts, no covers
> very low security risk (prisons, public areas)
* Source:SEAV – ‘Operating Costs of Gas Appliances’ & Choosing a heating system’ / BSRIA Application Guide AG 12/2001
© REHAU
UNDERFLOOR HEATING AND COOLING
WHY COOLING?
-
Over heating of residential buildings is even in UK climate conditions quite common for
the following reasons:
- High internal gains through people
- High internal gains through electrical equipment e.g. TV’s, Computers/Laptops etc.
- High solar gains
- Higher insulation of building
- Lower air leakage rates
© REHAU
UNDERFLOOR HEATING AND COOLING
PRINCIPLES OF UNDERFLOOR COOLING
Thermal comfort of a person is determined by:
• The person’s activity
• The person’s clothes
• Air temperature
• Air speed
• Air humidity
• Surface Temperature
Heat output of the human body occurs via three main mechanisms:
RADIATION
EVAPORATION
CONVECTION
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM DESIGN
Important factors which effect the cooling output
- Floor covering
- Pipe spacing
- Pipe dimension
- Floor Construction
- System
- Heat gains
© REHAU
UNDERFLOOR HEATING AND COOLING
THERMAL MASS OF EMMITERS
- Lower thermal mass
- Chip board 25 mm
- Plaster board 25 mm
- Higher thermal mass
UFH system for joisted floors
Chilled ceiling element
- Screed 65 mm
- Concrete 150 to 200 mm
- Typical response times
- Screed (75mm) – 1 -1.5 hr/1°C
- Concrete (150mm) – 4 – 6 hr /1°C
Screed systems
TABS systems
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM DESIGN
Typical “R” Values of Floor Coverings
Thickness
Description
Cross Section
d
mm
Thermal
Conductivity
λ
W/mK
Resistance
RλB
M²K/W
Carpet
10
0.07
Max
0.15
Wood/
Adhesive
8
2
0.2
0.2
0.04
0.01
0.05
Vinyl
5
0.23
0.022
Ceramic Tiles/
Thin Mortar Bed
10
2
1.0
1.4
Ceramic Tiles/
Mortar Bed
10
10
1.0
1.4
Flagstones/
Mortar Bed
15
10
3.5
1.4
0.01
0.001
0.011
0.01
0.007
0.017
0.004
0.007
0.011
Overall
Thickness
dWD
mm
10
10
5
12
20
25
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM DESIGN
• Typical 100-150mm pipe centres
• 16mm x 1.5mm RAUTHERM Universal pipe
• Flow temp 16ºC – Return temp 19ºC
• With a surface temperature of 20ºC and room temperature of 26ºC – 32W/m² cooling can be
achieved.
• IT IS RECOMMENDED THAT A FLOOR COVERING WITH A LOW THERMAL RESISTANCE IS
USED TO MAXIMISE THE COOLING OUTPUT (Tile, Slate etc.)
© REHAU
UNDERFLOOR HEATING AND COOLING
COOLING CONTROLS
REHAU INTELLIGENT CONTROL SYSTEM HEATING & COOLING MODES:
• Each zone controlled by a room sensor – continuously compares required room temp with
actual room temp
• If room temp is too low or high it signals the actuator to open the return valve and allow
warm or cold water to flow into the circuit
SET-BACK MODE:
• When leaving the house or at night, systems allows internal temp to drop to a lower level
• In cooling mode it allows the internal temperatures to INCREASE
• Makes the system respond quickly & efficiently
© REHAU
UNDERFLOOR HEATING AND COOLING
REHAU CONTROL OPTIONS
© REHAU
UNDERFLOOR HEATING AND COOLING
BMS AND UNDERFLOOR HEATING CONTROLS
Underfloor Heating Controls with BMS Compatibility
Advantages
- Specifically designed for underfloor heating and
cooling
- Developed and tested software
- Remotely monitor and control UFH/C system
- Optimise running costs
- Install less sensors to do the same job
- Low cost option
© REHAU
SUB-SURFACE HEATING / COOLING CONTROLS
STAR CONTROLS – FOR MULTI-OCCUPANCY PROJECTS
REHAU STAR Control System
Advantages
- Cost Effective
- Easy to use
- Underfloor heating ONLY
- Reliable PWM used
- Valve protection system reduces maintenance
- Night setback can deliver savings of up to 30%
© REHAU
UNDERFLOOR HEATING AND COOLING
FLOOR TYPES OVERVIEW
DIFFUSION PLATE
RAUFIX
FLOATING FLOOR
TACKER SHEET
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM COMPONENTS
Rautherm Universal Pipe
-
Excellent thermal and chemical resistance
-
Can withstand 6 bar at 95ºC
-
Pipe ‘kinks’ do not damage the pipe and still
maintains 98% strength
Base pipe made of PE-Xa
Adhesive
O2-Barrier coating made of
EVAL Oxygen impermeability
according to B.S 7291
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM COMPONENTS
Rautherm Universal Pipe
-
Made from Cross-Linked Polyethylene (PE-Xa)
Conforms to:
-
WRAS
BBA Approved
BS 7291
DIN 4726
Polyethylene
Polyethylene Cross
linked
© REHAU
UNDERFLOOR HEATING AND COOLING
SYSTEM COMPONENTS
-
Nearly 1 billion installations worldwide – no
leaks!
-
10 year comprehensive loss warranty
-
Fast and simple installation (60% quicker
than copper)
© REHAU
POLYMER CAN BE GREEN
ENVIRONMENTAL AND RECYCLABLE ISSUES
Lower cost to the environment for production
- No mining operations for the ore
- PEX pipe is chemically inert therefore highly resistant
to corrosion and lasts longer
- PE is abundant, created by refining operations
- Low energy cost to produce compared with copper
- No chlorine is used in production of PEX
Proven long life and durability
- Provides value: Performance vs environmental cost
- Recyclable PEX can be ground up to inert “filler” e.g.
inert filler in asphalt, irrigation tube etc
Other Consideration
- Quiet operation
- Dampens water hammer, reduces pressure spikes that may harm equipment and fixtures
- Does not add minerals to drinking water or to the public water system
© REHAU
RENEWABLE ENERGY SOLUTIONS
DOMESTIC APPLICATIONS
Low energy windows /
curtain walling
Ground-air heat
exchanger
District heating
pipework
Underfloor
heating/cooling
Ground-source
probes/collectors
Stormwater
management
Rainwater harvesting
© REHAU
THANK YOU FOR YOUR ATTENTION
ANY QUESTIONS?
www.rehau.co.uk
Building
Automotive
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