3, heat conducts coefficient: This concept is the core noun of this standard. All palisade structures: The door, window, outside wall, housetop and ground spread out around this concept. Blueprint is examined or the government checks a branch selectiving examination also is this data. Her substantival explanation is: Difference of temperature of two side air is palisade structure 1 ℃ , 1h passes the quantity of heat that 1m2 area delivers, unit W/m2.k. Saying simply is the rate that quantity of heat delivers in some kind of material, rate is minorrer, so the heat proof quality of this kind of material is better also. How to get this data? Conduct heat 1/ R0 of coefficient K0 ＝ .
R0, express thermal resistance: Unit of Ri ∑R Re of R0 ＝ : M2/K.W
Ri and Re are the heat exchange block of surface of material inside and outside respectively. They are fixed data, can differ by the watch: 0.11m2/K.W 0.04m2/K.W.
∑R is the thermal resistance the sum of each material. The ／ of thermal resistance R=δ of some monolayer material λ , δ is the ply of this material, the unit is M, λ is the coefficient of thermal conductivity of this material, the unit is W/m.K. λ is the crucial data in this formulary evaluation process, also be the inherent attribute of every kinds of material. Her substantival explanation is: The object with thick 1m, difference of temperature of two side air is 1 ℃ , 1h passes the quantity of heat that 1m2 area delivers, unit W/m.k. Be less than 0.3 W/m.K and can use λ of coefficient of thermal conductivity at the material of adiabatic project normally, be called heat insulating materials. Coefficient of thermal conductivity is heat insulating materials is the most important the mainest hot physics index. For example: 1.74W/m.K of ＝ of common concrete λ , 1.51W/m.K of ferroconcrete λ ＝ , 0.58W/m.K of ＝ of perforated brick λ , 0.047W/m.K of ＝ of λ of polyethylene expanded plastics, 0.0216W/m.K of ＝ of λ of polyurethane hard expanded plastics, (this kind of material is in especially inside global limits Euramerican the uses the most generally data in waiting for a developed country to regard a building as adiabatic project) , and 49.9W/m.K of cast-iron λ ＝ . In actual project application, design of part of the wall outside getting stuck to compare those who strap office building especially is used get together acerbity ester of different cyanogen Niao (PIR) , 0.020W/m.K of this kind of more new-style material λ ＝ , belong to heat insulating materials. This is maintain a structure conduct heat the process seeking solution that coefficient K is worth.
Be united in wedlock below " public construction is energy-saving design standard " the one by one of adiabatic requirement compose that writtens guarantee to the departmental cent palisade of Shanghai area discusses:
1. roofing: K≤0.70W/m2.k
Our habitual practice can satisfy this requirement commonly. For example: Concrete of bubble of ＋ of layer of make level of mortar of 20 thick cement looks for ＋ of floor of concrete of 120 thick cast-in-place slope layer is the thinnest 40 thick λ ＝ 0.03W/m.K squeeze 30 thick ＋ model board (XPS) ＋ of ＋ waterproof layer covering layer of mortar of 20 thick cement, such practice can achieve K≤0.60W/m2.k. The heat-insulation layer that must notice a key should choose 40 large crowded model commonly board, if choose,get together benzene board, ply should increase to 60.
Previous 1 2 34 5 Next