腐蚀性水中Cl-、游离CO2等都具腐蚀性,溶解氧的存在增加了对金属管道的腐蚀损坏效果。应用水源热泵体系时,对腐蚀性、硬度高的水源,应在体系中加装抗腐蚀的不锈钢换热器或钛板换热器。
不锈钢换热器有些水源矿化度较高,对金属的腐蚀性较强,如直接进入机组会因腐蚀效果削减机组使用寿命。假如通过水处理的办法削减矿化度,费用很大。通常选用加装板式换热器中间换热的方式,把水源水与机组离隔,使机组免了水源水可能发生的腐蚀效果。
当水源水的矿化度小于350mg/L时,水源体系能够不加换热器,选用直供衔接。当水源水矿化度为350-500mg/L时,能够装置不锈钢换热器。当水源水矿化度>500mg/L时,应装置抗腐蚀性好的钛合金板式换热器。也可装置容积式换热器,费用比板式换热器少。
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