Method for control of hard water scale deposition in evaporative

Details Method for control of hard water scale deposition in evaporative Method for control of hard water scale deposition in evaporative

1991-12-05

1993-04-06

Hepperle, Stephen M.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137 91, G05D 1113

Patent

active

051994534

ABSTRACT:
Disclosed is a method and apparatus for preventing or minimizing scale deposition from hard water onto heat transfer surfaces in atmospheric cooling towers, such as those used in air conditioning and refrigeration systems, where evaporative cooling of water provides the necessary heat sink to the atmosphere. An electrical/mechanical control system responsive to changes in density of the water in the evaporative cooling system operates to permit discharge of water containing dissolved and suspended solids from the system when its density reaches a predetermined maximum value and to discontinue the discharge of cooling system water when its density reaches a predetermined minimum value. Water drained from the cooling system is replaced by fresh water, preferably by water containing chemical additives to increase solubility of hard water minerals in the cooling water.

REFERENCES:
patent: 2543522 (1951-02-01), Cohen
patent: 2869831 (1959-01-01), Brockelsby
patent: 3195551 (1965-07-01), Russell
patent: 3282277 (1966-11-01), Hayman
patent: 3485257 (1969-12-01), Gegenheimer et al.
patent: 3557817 (1971-01-01), Royse
patent: 3754741 (1973-08-01), Whitehurst
patent: 4982755 (1991-01-01), Roberts et al.

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