# US 8,788,105 B2 · Method of automatic hydraulic equalization in a fluid-flow system

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- Number: US 8,788,105 B2
- Document ID: US8788105B2
- Status: Granted
- Kind: B2
- Application number: 13/153,937
- Filed: 2011-06-06
- Published: 2011-12-08
- Granted: 2014-07-22
- Earliest claimed: 2010-06-05
- Assignees: Oventrop GmbH & Co. KG
- Applicants: Gerhard Loeffler
- Inventors: Gerhard Loeffler
- Web page: https://patentgrep.com/patent/US8788105B2

## CPC

- F24F 3/06: characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24D 19/1012: {by regulating the speed of a pump}
- F24D 19/1036: {Having differential pressure measurement facilities}
- F24F 11/83: by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F 11/84: using valves
- F24F 11/85: using variable-flow pumps
- F24D 2220/0264: Hydraulic balancing valves
- Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A heating-cooling system has a plurality of users, a piping system subdivided into a plurality of zones in each of which a respective group of the users is connected in parallel, a heater or cooler having a supply line and a return line connected to the zones, a pump connected to the heater or cooler and to one of the lines for flowing a heat-exchange medium through the respective users, and respective flow-control valves connected in each of the zones for controlling flow of the medium therethrough and establishing in the respective zones a respective differential pressure. Flow in the zones is adjusted by controlling the respective valves to make a detected actual value of the differential pressure in the zone correspond to a set-point value previously detected and stored, with the differential pressure across each of the control valves being similarly feedback controlled.

## Claims

### Claim 1

A method of hydraulically calibrating a heating/cooling system having:
a plurality of users;
a piping system subdivided into a plurality of areas in a building in each of which a respective group of the users is connected in parallel;
a heater or cooler having a supply line and a return line connected to all of the areas;
a pump connected to the heater or cooler and to one of the lines for flowing a heat-exchange medium through all of the users; and
respective flow-control valves connected in each of the areas for controlling flow of the medium therethrough and establishing in the respective areas a respective differential pressure,
the method comprising the steps of:
detecting the pressure differentials between inlet and outlet sides of each of the valves and generating respective set-point outputs corresponding thereto;
detecting the pressure differential between the supply and return lines and generating a set-point output corresponding thereto;
storing all of the outputs; and thereafter
continuously monitoring the pressure differentials between the inlet and outlet sides of each of the valves and generating respective actual-value outputs corresponding thereto;
fully opening the valve of the fluidically least efficient area, thereafter only adjusting flow in the other valves, and thereafter
continuously monitoring the pressure differential between the supply and return lines and generating an actual-value output corresponding thereto and operating the pump while adjusting the valves in such a manner that the least effective area is supplied with sufficient differential pressure; and
continuously comparing each of the actual-value outputs with the respective set-point outputs and adjusting flow through each of the valves so as to bring the respective actual-value output into agreement with the respective set-point value.

### Claim 2 (depends on 1)

The calibration method defined in claim 1, further comprising before detecting the differential pressures, the step of:
presetting the flow rates of the valves.

### Claim 3 (depends on 1)

The calibration method defined in claim 1, further comprising the step of
reducing the differential pressures in the valves in a setback operating mode.

### Claim 4 (depends on 1)

The calibration method defined in claim 1, wherein the outputs are stored in and controlled with a computer, the method further comprising the step of:
connecting the computer to the internet and communicating therethrough with other computers connected to the internet.