# US 11,999,640 B2 · Method for sanitizing water supply system

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- Number: US 11,999,640 B2
- Document ID: US11999640B2
- Status: Granted
- Kind: B2
- Application number: 17/485,419
- Filed: 2021-09-25
- Published: 2022-03-10
- Granted: 2024-06-04
- Earliest claimed: 2020-09-10
- Assignees: Intellihot, Inc.
- Applicants: Intellihot, Inc.
- Inventors: Sridhar Deivasigamani; Sivaprasad Akasam
- Web page: https://patentgrep.com/patent/US11999640B2

## CPC

- C02F 1/78: with ozone {(C02F1/4672 takes precedence)}
- C02F 1/008: {Control or steering systems not provided for elsewhere in subclass C02F}
- C02F 1/02: by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D)
- C02F 2209/02: Temperature
- C02F 2209/23: O3
- C02F 2209/40: Liquid flow rate
- C02F 2209/44: Time
- C02F 2303/04: Disinfection
- C02F 2307/06: Mounted on or being part of a faucet, shower handle or showerhead
- F24D 2200/20: Sewage water
- Y02W 10/37: using solar energy
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- F24D: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A method for controlling ozonation in a water supply system including an ozonator, a controller functionally connected to the ozonator, a flow meter configured for detecting a flowrate through the water supply system, a valve configured for turning on or off of the water supply system, the method including using the controller for; determining at least one event from flowrate data of the flow meter over a time period of a plurality of days, the at least one event including a time span of a day in which the flowrate remains below or at a threshold value over the time span of a day within each day of the plurality of days; determining overlaps of the at least one event of all days within the time period; determining a frequency of the overlaps of the at least one event over the time period and determining a requirement for ozone.

## Claims

### Claim 1

A method for controlling ozonation in a water supply system comprising an ozonator, the water supply system functionally connected to the ozonator, a flow meter configured for detecting a flowrate through the water supply system, a valve configured for turning on or off of the water supply system, said method comprising using the water supply system for: (a) determining at least one event from flowrate data of the flow meter over a time period of a plurality of days, said event comprising a time span within a day in which the flowrate remains below or at a threshold value over said time span within a day for each day of said plurality of days; (b) determining overlaps of said each event to another one of said each event of all days within said time period; and (c) determining a frequency of the overlaps of said each event over said time period; and (d) determining a requirement for ozone, wherein if the frequency exceeds a frequency threshold and said requirement for ozone exists, a counteraction pair including a first action and a second action in opposition to the first action is executed during a time span corresponding to said each event, wherein said first action is executed at a start time within said time span corresponding to said each event and said second action is executed at an end time within said time span, wherein said first action comprises turning on the water supply system and turning on the ozonator.

### Claim 2 (depends on 1)

The method of claim 1, wherein said second action comprises turning off the water supply system and turning off the ozonator.

### Claim 3 (depends on 1)

The method of claim 1, wherein said start time is disposed at a first offset period prior to the end of said time span.

### Claim 4 (depends on 3)

The method of claim 3, wherein said first offset is about 1 hour.

### Claim 5 (depends on 3)

The method of claim 3, wherein said first offset is about 30 minutes.

### Claim 6 (depends on 1)

The method of claim 1, wherein said end time is disposed at a second offset after the start time.

### Claim 7 (depends on 6)

The method of claim 6, wherein said second offset is about 15 seconds.

### Claim 8 (depends on 1)

The method of claim 1, wherein the water supply system supplies water at a point of use and the ozonator comprises an ozone sensor configured to obtain an ozone concentration level at said point of use and said ozonator is configured to ozonate at a rate based on said ozone concentration level.