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US 5,101,851 AGranted
Apparatus for control of hard water scale deposition in cooling systems
AssigneeKhodabandeh Abadi
InventorsKhodabandeh Abadi, Craig A. Hunt
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AssigneeKhodabandeh Abadi
InventorsKhodabandeh Abadi, Craig A. Hunt
Estimating the term…
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.
Apparatus responsive to a first variable representing changes in conditions of a liquid in a heat transfer system to control compensating conditiosn in a related second variable which comprises first and second detector means responsive to changes in said first variable for determining first and second predetermined limiting conditions thereof, said means comprising first and second output means providing electrical signals indicative of said first and second conditions respectively, a first amplifier having an input coupled to receive the electrical signal from said first detector output, a second amplifier having an input coupled to receive the electrical signal from said second detector output, means comprising an inverter having an input coupled to the output of said first amplifier for providing an output signal inverted in polarity with respect to its input signal, inverter and the output of said second amplifier, output means for deriving an output signal from said RS flip-flop circuit including a flow control means controlling addition of liquid to said system and removal of liquid therefrom as said related second variable.
Dependencies are inferred from the claim text.