System and method of controlling condensing and non-condensing boiler firing rates

摘要

Hydronic heating systems, controllers for such systems, and methods of using/operating same are disclosed herein. In one example embodiment, such a system includes at least one condensing boiler and at least one non-condensing boiler, and at least one controller configured for utilizing at least one PID control program to generate at least one signal for controlling firing rates of one or more of the boilers based upon sensed water temperature and temperature setpoint inputs. Depending upon the mode of operation, the at least one PID control program is a first PID control program dedicated to controlling only the at least one condensing boiler, or is a second PID control program dedicated to controlling only the at least one non-condensing boiler, or includes both the first and second PID control programs. Also, outside air temperature serves as a basis for generating the temperature setpoint inputs.

主权项

1. A hydronic heating system, comprising:
at least one condensing boiler; at least one non-condensing boiler; and at least one controller configured to operate to determine, at least indirectly, first and second firing rates for the at least one condensing boiler and the at least one non-condensing boiler, wherein the at least one controller is configured to operate in accordance with a first proportional-integral-derivative (PID) control loop to determine, at least indirectly, the first firing rate for the at least one condensing boiler, wherein, the at least one controller is configured to operate in accordance with a second PID control loop to determine, at least indirectly, the second firing rate for the at least one non-condensing boiler, wherein the first PID control loop is configured to generate a first output signal that at least indirectly determines the first firing rate, based at least in part upon a first comparison of a first sensed supply header water temperature and a first supply header water temperature setpoint, and wherein the second PID control loop is configured to generate a second output signal that at least indirectly determines the second firing rate, based at least in part upon a second comparison of a second sensed supply header water temperature and a second supply header water temperature setpoint.