Type 0006

Number
6

Name
Auxiliary Heater

Description
An auxiliary heater is modeled to elevate the temperature of a flow stream using either internal control, external control or a combination of both types of control. The heater is designed to add heat to the flow stream at a user-designated rate (Qmax) whenever the external control input is equal to one and the heater outlet temperature is less than a user-specified maximum (Tset). By specifying a constant value of the control function of one and specifying a sufficiently large value of Qmax, this routine will perform like a domestic hot water auxiliary with internal control to maintain an outlet temperature of Tset. By providing a control function of zero or one from a thermostat or controller, this routine will perform like a furnace adding heat at a rate of Qmax but not exceeding an outlet temperature of Tset. In this application, a constant outlet temperature is not sought and Tset may be thought of as an arbitrary safety limit.

Known Issues
For simple way to model a boiler, set efficiency of about 0.8.

Similar TYPE
Type 0659