Heating system control based on required heating power

Details Heating system control based on required heating power Heating system control based on required heating power

2008-02-06

2011-12-27

Shechtman, Sean (Department: 2121)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Mechanical control system

C700S031000, C703S007000

Reexamination Certificate

active

08086353

ABSTRACT:
A control system and method for controlling an indoor heating system for an indoor environment of a building in accordance with a desired indoor temperature, comprising a sensor (18) for detecting an outdoor temperature, a sensor (17) for detecting a in return temperature T.sub.return of a heat carrying medium circulated in a heat distribution system with a flow rate, and a controller (13). The controller is adapted to determine a required heating power P.sub.req to be delivered by the heat distribution system to maintain a heating power balance according to P.sub.req=P.sub.loss-P.sub.source, where P.sub.loss is an approximation of heating power losses from the building, and includes a dynamic approximation of heating power transfer through walls of the building, based on at least the desired indoor temperature, the detected outdoor temperature, a heat transfer coefficient of the wall, and a heat capacity of the wall, and P.sub.source is an approximation of heating power sources external to the heating system, and, based on the detected return temperature, control a combination of forward flow temperature and flow rate so as to ensure that the distribution system delivers the required heating power. According to the present invention, a dynamic model of the heating power balance of the building is used to control the heating power delivered by the heating system. This results in improved control compared a control scheme based only on flow temperature control based on outdoor temperature.

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