Global Patent Index - EP 1159658 A1

EP 1159658 A1 2001-12-05 - METHOD AND APPARATUS FOR FLOWING LIQUID TEMPERATURE CONTROL

Title (en)

METHOD AND APPARATUS FOR FLOWING LIQUID TEMPERATURE CONTROL

Title (de)

VERFAHREN UND VORRICHTUNG ZUR REGELUNG DER TEMPERATUR EINER STRÖMENDEN FLÜSSIGKEIT

Title (fr)

PROCEDE ET APPAREIL DE REGULATION DE LA TEMPERATURE D'UN LIQUIDE EN ECOULEMENT

Publication

EP 1159658 A1 (EN)

Application

EP 00912192 A

Priority

  • US 0005932 W
  • US 26178899 A

Abstract (en)

[origin: WO0052547A1] A method and apparatus for controlling the temperature of a flowing liquid in a process. Process parameters are identified in a controller. The process parameters typically include a set point temperature and data corresponding to a specific heat and density of the liquid. One or more sensors permit the controller to monitor the incoming temperature, outgoing temperature and flow rate of the liquid at the heater. A theoretical power required for the heater to adjust the outgoing temperature of the liquid to be substantially equal to the set point temperature is determined. A heater efficiency correction factor derived from information including the incoming liquid temperature and flow rate is also determined. A calculated power is derived from information including the theoretical power and the heater efficiency correction factor. A final power to be applied to the heater is derived from information including the calculated power and an error term. The error term is substantially continuously derived by a control algorithm using information including a proportional term, an integral term and a derivative term. The derivative term is derived from information including the difference between the set point temperature and the outgoing temperature of the liquid (TSET-TOUT). The final power is applied to the heater to adjust the outgoing temperature of the liquid to be substantially equal to the set point temperature.

IPC 1-7 (main, further and additional classification)

G05D 23/20

IPC 8 full level (invention and additional information)

G05D 23/19 (2006.01)

CPC (invention and additional information)

G05D 23/19 (2013.01)

Citation (search report)

See references of WO 0052547A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0052547 A1 20000908; EP 1159658 A1 20011205; JP 2002538544 A 20021112

INPADOC legal status


2002-05-22 [18W] APPLICATION WITHDRAWN

- Date of withdrawal: 20020321

2001-12-05 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010926

2001-12-05 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE