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Armaflex Solutions For Cooling , Refrigeration

Armaflex Solutions For Cooling , Refrigeration. Air Conditioning and Ventilation. Armaflex Solutions For Cooling , Refrigeration , AC and Ventilation Systems. General information on condensation control . Products for Cooling and Refrigeration and Air Conditioning

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Armaflex Solutions For Cooling , Refrigeration

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  1. ArmaflexSolutions For Cooling, Refrigeration Air Conditioning and Ventilation

  2. ArmaflexSolutions For Cooling, Refrigeration, AC and Ventilation Systems • General information on condensationcontrol. • Products for Cooling and Refrigeration and Air Conditioning • Products for Ventilation.

  3. Cooling &Refrigeration • Target: • Preventcondensation • Improvethe protectionagainstcorrosionunderinsulation • Limitheat gain(energy savings)

  4. Condensation Control– main problem to deal with on cooling, refrigeration and AC installations Water on the surface of metal pipecausecorrosion.

  5. Condensation Control– main problem to deal with on coolingrefrigeration and AC installations

  6. Whatiscondensation? Air contains a quantity of water vapour.

  7. dew point (+19,4°C) initial (ambient) temp. (+22°C) final (line) temp. (+6°C) humidity 100% humidity 85% humidity 100% • Whatiscondensation? Reduction of ambient air temperature will cause the relative humidity to increase even with the same amount of moisture, up to 100% for dew point. excess moisture (surface condensation)

  8. [°C] + 0° - Condensation control - dew point pipe ambient temp. dew point temp. line temp. surface temp. (> dew point temp.) insulation

  9. Insulationsurfacetemperaturecan not exceedthedewpointtemperature o = 19,9°C > o = R = 19,4°C R = 19,4°C steelpipe DN 15 ext. diameter 21,3 mm linetemp. m = + 6°C ambienttemp. a = + 22°C humidity = 85 % SR = 14,2 mm Smin = 16,5 mm Snom = 18,0 mm thicknessrange tubeAF-4-022

  10. Minimal insulation thicknessas a function of humidity mm pipe  28mm ambient temp. = +25°C -12°C insulation thickness relative humidity of the ambient air

  11. TF h T TW q Surfacecoefficient of heat transfer – influence thecondensation on theinsulation 9W/(m2K) temperature of external surface depends on surface coefficient ambienttemperaturea surfacetemperature 5W/(m2K) hse externalsurfacecoefficient linetemperaturei

  12. Surfacecoefficient of heat transfer - equations Surfacecoefficient of heat transfer canhaveveryvariousvaluesdepending on kind (rough/smooth) and colour(black/bright) of surface, kind of medium (liquid/gaseous) and velocity of flow of medium as well as temperature of insulationsurface and ambient. Surfacecoefficientusuallyconsists of two parts: due to convection and due to radiation: h = hc + hr. Radiation part can be calculatedaccording to therules of heat transfer by radiation. Howeverconvection part can be calculatedbased on empiricalequations. Alltogetherdue to abovereasonthecalculatedvalue of surfacecoefficientisnevertooprecise and its precision can be even30% (or less precise). hr hc

  13. Surfacecoefficient of heat transfer - values m/s

  14. Static area increases the danger of condensation lack of free air circulation (convection)

  15. Location of the tank - view from top diameter 8.2 m hight 4.5 m air flow

  16. No distance to thewall: condensation

  17. Condensationonlyintheseplaceswheresurfacecoefficientislow

  18. Required air gaps between insulated objects 100 mm 100 mm 100 mm 100 mm 100 mm 100 mm 1000 mm 1000 mm 1000 mm min. 25 mm (better100 mm) for pipes / smallobjects 1,000 mm for vessels / largeobjects

  19. Condensation Control– main problem to deal with on coolingrefrigeration and AC installations Watervapourdiffusion Ice=2,2 W/(mK) Watervapourpenetrationcausesdeteriorationintheinsulationproperties temp.- 20°C λgoesup as an effect of watervapourpenetrationintoinsulationmaterial Water =0,55 W/(mK) Condensation on the pipewall DryInsulation=0,033 W/(mK)

  20. temp.+ 6°C RH 0% ambient temp. 22°C relativehumidity RH 70% Smalltransmissionthroughresistantinsulation Thanks to strongvalue water vapour penetration is very slow and kept at limited level.  = watervapourdiffusionresistancefactor diffusion in air  = diffusion in insulation

  21. g · cm m2 · h · Pa Water vapour permeability Important: water vapour permeability ismeasuredatconstanttemperature. Water vapour partial pressure difference isensured by humidity sorbent insidethetubeorinsidetheboxwithsheet lid: relativehumidity = 0. Diffusioninthematerialor air isdefined by water vapour permeability Test for sheetsacc. to EN 12086at 23°C and 50% humidity

  22. Water vapour permeability by materials air insulation metal

  23. 23 In refrigeration and air-conditioningonly elastomeric insulation should be used Armaflex ULTIMA AF/Armaflex Armaflex XG Armaflex ACE NH/Armaflex HT/Armaflex Why?

  24. 24 A reliable closed-cellmaterialmust protect the insulation against impermissible penetration of moisture. A high -value reduces the possibility of moisturepenetrationintoinsulation 

  25. 6°C RH 0% Tight joints are important Installation should be carried out with products that enable a tight fit both at the joints as well as along the pipe length. Rigid insulation can often leave a gap where moisture can form.

  26. Tight joints The integrity of the system (tight joints) is only ensured by correct installation procedures and the use of correct adhesive. The contact System Armaflex Adhesive grabs the Armaflex insulation surface by chemical reaction resulting in a “cold weld” joint. “cold weld” jointguaranteesrequiredtightness

  27. Armaflex products based on FlexibleElastomericFoamhaveexcellentμvalue Armaflex products have a closedcellstructure and verygoodμ-values • > 10 000 • > 7 000

  28. Closed cell insulation prevents corrosion • AF/Armaflexinsulation after 20 years • valuesof  i parameterspreserved

  29. Solving the problems with Armaflexinsulation • The vapour barrier is not concentrated on a thin (sensitive and relatively inflexible) film or the like, but is built up over the entire insulation thickness. • The resistance to water vapour diffusion permanently reduces diffusion phenomena to a minimum. • The highly flexible foam fits around even the most complicated of objects, and it can be bonded over the entire insulation thickness at critical points (e.g. penetrations, junctions, etc.). • Armaflexinsulationcan be insatlledwithoutanygapswheremoisturecan form due to excellentgluedconnections

  30. 30 Products for coolingrefrigaration AC and ventilation StaNDARD FEF PRODUCTS Armaflex XG, Armafix X Armaflex ACE HT/Armaflex ArmaflexDuct Refrigeration, Cooling Air Conditioning and Ventilation • PREMIUM FEF PRODUCTS: • AF/ARMAFLEX,ARMAFIX AF • TUBOLIT SPLIT • SPECIAL FEF PRODUCTS: • ARMAFLEX ULTIMA • NH/ARMAFLEX • EPDM PRODUCTS: • HT/ARMAFLEX • HT/ARMAFLEX S TAPE SHEETS TUBES

  31. Armaflex - Applications Armaflexinsulation: for pipes,air ducts, vessels of air-conditioning / refrigeration and process equipment prevent condensation and save energy. Structure-borne noise reduction

  32. Thank you www.armacell.com

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