Weak current College】 【machine room exclusively used air conditioner selection guide-Power By】 【China power house network.

<br> A estimation of air conditioners and the cooling capacity, the selected device model is usually to consider the following main factors A-1, engine equipment heat A-2, room area A-3, room conditions (including layers high, seal ., decoration, outdoor installation location, and so on) A-4, local climatic conditions A-5, model specifications rounded unified B, PABX room press switches the "door" or "line" number estimates: 2.4 ~ 3.5kcal / h · .door or line by switch room "area" check: 165 ~ 222w/m2 [150 ~ 200kcal / h · m2] *. switch heat emission increases with traffic, but it does not change; *. in outdoor environment temperature in particular areas such .as 50 ¡ .æ, can be considered per room 8.2kw 100m2 about their dissipation; other climatic conditions need not be considered. C, computer room C-1, according to the estimation of the cooling capacity per unit area: Chinese equipment room in a one-story .building in 290 ~ 350w/m2 [250 ~ 300kcal / h · m2] room in multi-storey buildings 175 ~ 290w/m2 [150 ~ 250kcal / h · m2] Soviet 450 ~ 565w/m2 [390 ~ 485kcal / h · m2 .] United States 350 ~ 405w/m2 [300 ~ 350kcal / h · m2] Japan 407 ~ 525w/m2 [350 ~ 450kcal / h · m2] Note: 1, with the computer, VLSI integrated circuits and chip technology, computer volume are .smaller, more heat emission is significantly reduced, with a corresponding estimation index also require certain adjustments; but as the network technology, requires a computer with more reliable, run more quickly, with a corresponding increase in heat and, consequently, the cooling capacity of .estimation should be combined with the actual situation. 2, for the vast majority of the engine room (equipment General calorific value), not accurate computer room equipment calorific value, the precision air-conditioning selection can be directly follow 290 ~ 350w/m2 or .0.29-0.35KW/m2 (equivalent to 250 ~ 300kcal / h · m2) standards for design, but for security reasons, most cases follow 0.35KW/m2 (ie 300kcal / h · m2) of standard design. C-2, according .to computer room equipment for the heat of cooling capacity: foreign companies tend to complete the installation of computer equipment, electric power in the country is also multiplied by a certain value of coefficient ① host device dissipation 1000NK Q = Q-heat dissipation w N- .host device installed power (kW)-total factor K, domestic equipment 0.4 ~ 0.5; import equipment 0.6 ~ 0.8 ② external device dissipation 1000NK Q = Q-heat dissipation w N-external devices installed power (kW)-total factor K, domestic .equipment 0.2 ~ 0.3; import equipment 0.5C-3, lighting the heat quantity Q = 1000n1n2n3NC-4, human body heat dissipation and powder moisture Q = nq W = nw notes: 1. Because the actual type is often press air conditioners series model .specifications upward rounding, so that you have a safety factor of 3, 4, and therefore the amount of heat is negligible; 2. Other telecommunication room selection you can reference the parameters of the computer room. D, a new air conditioning system at the .following three items in one of the biggest: D-1, press room staff take 40m3 / h · pD-2, maintaining the room interior pressure required air flow through the engine room air conditioning D-3, total air volume of 5% with .underfloor air velocity: 1.5 ~ 2.0m / s overall Underfloor air vent hole area floor area of 0.6% E, commonly used heat unit conversion E-1, pressure conversion 1 bar (bar) ≈ 1 kilogram-force/cm2 (at) ≈ .1 standard atmospheric pressure (atm) ≈ 105 Pascal (pa) E-2, cold energy conversion 1 horse (PS) = 2500 kcal (kcal / h) 1 kilowatt (kw) = 860 kilocalorie (kcal / h) 1 horse (PS .) = 2.9 kilowatt (kw) 1 ton = 3024 kilocalorie (kcal / h) 1BTU / h = 0.2519 kilocalorie (kcal / h) remarks: the above data are derived from the domestic and international variety of design manuals, technical standards and statistical reports ...