EP 1159658 A1 20011205 - 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
Application
Priority
- US 0005932 W 20000303
- US 26178899 A 19990303
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
IPC 8 full level
G05D 23/19 (2006.01)
CPC (source: EP)
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
DOCDB simple family (publication)
WO 0052547 A1 20000908; EP 1159658 A1 20011205; JP 2002538544 A 20021112
DOCDB simple family (application)
US 0005932 W 20000303; EP 00912192 A 20000303; JP 2000602903 A 20000303