Under Floor Heating

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Under Floor Heating

  1. 1. Ordre of Engineers Tripoli - Lebanon UNDER FLOOR HEATING TECHNOLOGY Eng. Wael Zmerly 02-11-2007
  2. 2. WHAT IS “FLOOR HEATING” TO USE THE FLOOR AS A HEAT EMISSION SURFACE Order of Engineers – Tripoli - Lebanon 2 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  3. 3. HISTORICAL BACKGROUND 2000 years ago Heating systems inspired by this idea were built by the Chinese, Egyptians and Romans. Order of Engineers – Tripoli - Lebanon 3 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  4. 4. HISTORICAL BACKGROUND 1900 At the start of this century floor heating appears in its present form. Hot water cycles inside a tube burred under ground. In London in 1909, one of the Royal palaces was heated with this new system. Order of Engineers – Tripoli - Lebanon 4 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  5. 5. HISTORICAL BACKGROUND 1945 TO 1950 In Europe, from 1945 to 1950, over 100,000 homes were heated by this technique. Very soon, however, it was noted that the equipment was causing numerous physiological problems due to the following facts: Metallic pipes instead of plastic (long distance between pipes) No use of cement slab, High thermal inertia. 40ºC The boiler temperature was 70ºC to 80ºC. The reason why the floor temperature was 34ºC to 40ºC. Which caused also some health problems. Order of Engineers – Tripoli - Lebanon 5 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  6. 6. THE NEW SYSTEMS FROM 1970s 3 New values were added: • Use of Floating floors. Low thermal inertia of the floor slab. • More insulation, Low heat losses. Low surface temperature (28 - 29ºC). Uniform heat distribution. • Plastic pipes, small pitches. 29ºC Order of Engineers – Tripoli - Lebanon 6 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  7. 7. ADVANTAGES ☺ Uniform heat distribution. ☺ Healthy conditions. Absence of air draughts. ☺ Safety. ☺ Space saving. ☺ Low noise ☺Temperature reduction from feet to head. ☺ Lack of dryness due to low temperatures. ☺ Friendly to the environment. ☺ Efficient. Low operating cost. ☺ Reduction of roof thermal loses. ☺ Short-term depreciation. Order of Engineers – Tripoli - Lebanon 7 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  8. 8. INCONVIENIENTS HEATING OUTPUT RELATED TO RELATIVLY HIGH THERMAL LIMITED AREA. INERTIA. Order of Engineers – Tripoli - Lebanon 8 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  9. 9. HEAT AND COMFORT RADIATOR HEATING FLOOR HEATING Hottest part of the room is at ceiling Coolest part of the room is at ceiling level. level. Room temperature setting below 21ºC (19). Room temperature setting at 21ºC. No draught. Cold feet due to cooler convective air No cold feet. current. Less dust which can settle on walls, furniture and curtains. Order of Engineers – Tripoli - Lebanon 9 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  10. 10. HEAT REPARTITION 270cm 170cm Floor heating Ceiling heating Radiators ext. Radiators int. Warm air 10cm ºC 16 20 24 16 20 24 Thermal comfort Warm air Radiators Radiators Floor heating Ceiling Ideal curve (external walls) (internal walls) radiant panel heating Order of Engineers – Tripoli - Lebanon 10 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  11. 11. APPLICATIONS RESIDENTIAL. OFFICES. INDUSTRIAL. Order of Engineers – Tripoli - Lebanon 11 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  12. 12. PANEL CONTAINEMENT STRUCTURES Skirting board Acrylic Acrylic adhesive Tiles grouting Insulation Protective Panel strip diaphragm Pipes 1.5cm Thermal Concrete 4.0cm 2.5cm Insulation 2.0cm Floor Slab Order of Engineers – Tripoli - Lebanon 12 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  13. 13. LAYOUT Distribution manifold Loops Order of Engineers – Tripoli - Lebanon 13 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  14. 14. LAYOUT Order of Engineers – Tripoli - Lebanon 14 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  15. 15. LOOP CONFIGURATIONS variation SINGLE SERPENTINE Order of Engineers – Tripoli - Lebanon 15 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  16. 16. LOOP CONFIGURATIONS Floor temperature Variation PARALLEL SUPPLY AND RETURN – COUNTERFLOW TYPE Order of Engineers – Tripoli - Lebanon 16 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  17. 17. LOOP CONFIGURATIONS Floor temperature Variation PARALLEL SUPPLY AND RETURN – SPIRAL TYPE Order of Engineers – Tripoli - Lebanon 17 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  18. 18. LOOP CONFIGURATIONS Order of Engineers – Tripoli - Lebanon 18 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  19. 19. MATERIALS Order of Engineers – Tripoli - Lebanon 19 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  20. 20. PIPES PEX – ALU - PEX PEX with oxygen barrier PIPE REEL Order of Engineers – Tripoli - Lebanon 20 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  21. 21. MANIFOLDS For correct operation and maintenance of the system, manifolds must have: •Main on/off valves, •Panel on/off valves, •Micrometric panel regulating valves, •Automatic air vents, •Drain cocks. Order of Engineers – Tripoli - Lebanon 21 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  22. 22. MANIFOLDS Order of Engineers – Tripoli - Lebanon 22 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  23. 23. PERIFERAL INSULATION STRIP Order of Engineers – Tripoli - Lebanon 23 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  24. 24. INSULATION BOARD Order of Engineers – Tripoli - Lebanon 24 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  25. 25. INSULATION BOARD Order of Engineers – Tripoli - Lebanon 25 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  26. 26. INSULATION BOARD Order of Engineers – Tripoli - Lebanon 26 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  27. 27. EXPASION JOINTS Order of Engineers – Tripoli - Lebanon 27 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  28. 28. NETWORK TESTING •For 30 min at 150% of working pressure •For 90 min at double working pressure •Installation test •Same pressure during the pouring of thermal concrete Order of Engineers – Tripoli - Lebanon 28 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  29. 29. CONCRETE COMPOSITION 1m³of concrete contain • 0,8m³ river sand • 0,4m³ gravel, 4 - 6mm grain size • 350 kg cement • 2,5 kg plasticizer • 250 kg water • 900 gr/m³ polypropylene fibers Order of Engineers – Tripoli - Lebanon 29 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  30. 30. CALCULATION PARAMETERS Ambient air temperature Outer diameter of pipe Thermal resistance of the floor Internal diameter of pipe Thermal conductivity of slab Thermal conductivity of pipe Thickness of slab above pipe Flow temperature of water Panel surface Center to center distance Thermal resistance below panel Underneath room temperature Order of Engineers – Tripoli - Lebanon 30 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  31. 31. REQUIRMENTS The most frequently used grids are as follows: CENTER TO CENTER DISTANCE • 7,5 15,0 22,5 30,0 37,5 • 5,0 10,0 15,0 20,0 30,0 • 45 a 55°C with traditional boilers; MAXIMUM DESIGN WATER • 40 a 45°C with district heating, condensing TEMPERATURE boilers, heat pumps; • 32 a 38°C with solar panels. Two aspects in consideration : HEAT OUTPUT REQUIRED • the lack of heat loss through the floors, • the heat contribution of any panels located on the floor above. SURFACE TEMPERATURE OF To avoid uncomfortable physiological conditions, the THE FLOOR surface temperature of the floor should be less than: • 29°C in continuously occupied environments, • 33°C in bathrooms, showers and swimming pools, • 35°C in perimeter areas or rooms rarely used. Order of Engineers – Tripoli - Lebanon 31 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  32. 32. REQUIRMENTS It is advisable not to be too high in order: TEMPERATURE DIFFERENCE OF • not to over-reduce the average temperature of the HEATING FLUID fluid, and thus the heat output of the panel; • to avoid surface temperatures which differ too much from each other, • Usually it is used below 8 ÷ 10°C Considering that the maximum flow of a panel is on PANEL FLOW average between: •200 ÷ 220 l/h, for pipes with Di = 16 mm •120 ÷ 130 l/h, for pipes with Di = 13 mm It is advisable that the difference between the preset HEAD REQUIRED head and that should be at least 200 ÷ 300 mm w.g. In domestic applications, it is advisable not to go LENGTH OF THE PANEL beyond the commercial lengths of pipe rolls (120 ÷ 150 metres) Order of Engineers – Tripoli - Lebanon 32 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  33. 33. HEAT OUTPUT tp = surface temperature of floor, °C ta = ambient temperature, °C q = specific heat output (upwards) of panel, W/m2 In particular (at ambient temperature = 20°C), the maximum specific output which can be transferred by a panel is: • qmax = 8,92 . ( 29 – 20 ) 1,1 = 100 W/m2 in continuously inhabited environments. • qmax = 8,92 . ( 33 – 20 ) 1,1 = 150 W/m2 in bathrooms, showers and swimming pools. • qmax = 8,92 . ( 35 – 20 ) 1,1 = 175 W/m2 in perimeter areas or rooms rarely used. Order of Engineers – Tripoli - Lebanon 33 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  34. 34. CONTROL SYSTEM Order of Engineers – Tripoli - Lebanon 34 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  35. 35. CONTROL SYSTEM Order of Engineers – Tripoli - Lebanon 35 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  36. 36. BOILER ROOM Mixing Valve Order of Engineers – Tripoli - Lebanon 36 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  37. 37. BETONKOERNAKTIVERUNG Order of Engineers – Tripoli - Lebanon 37 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  38. 38. WALL HEATING Radiant wall heating is one of the most comfortable form of heating available. Water circulating at 30-40ºC in pipes built into the wall provides gentle but highly efficient radiant heat. Order of Engineers – Tripoli - Lebanon 38 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  39. 39. CEILING HEATING Order of Engineers – Tripoli - Lebanon 39 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007
  40. 40. ELECTRICAL FLOOR HEATING Order of Engineers – Tripoli - Lebanon 40 Under Floor Heating Technology ZMERLY & CO SARL. Eng. Wael Zmerly - 2007

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