These probably represent about one half to one-fifth of the figures used for tubulars as quoted in Kern, but it must be noted that the Kern figures probably are conservative, even for tubular exchangers.

APV, meanwhile, has carried out test work that tends to confirm that fouling varies for different plates with the more turbulent type of plate providing the lower fouling resistances. In testing an R405 heating a multicomponent aqueous solution containing inverse solubility salts (ie, salts whose water-solubility decreases with increasing temperature), it was learned that the rate of fouling in the Paraflow was substantially less than that inside the tubes of a tubular exchanger. The tubular unit had to be cleaned every 3 or 4 days while the Paraflow required cleaning about once a month.

Additional tests on cooling water fouling were sponsored by APV at Heat Transfer Research, Inc. (HTRI) with the test fluid being a typical treated cooling tower water. Results of these experiments follow.

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