FUNCTION_BLOCK ZONE_MDL

An instance of this function block type provides the dynamic model of a heating/cooling zone in the HVAC example according to the differential equation:
CvV dT/dt = FCv(Ti - T) + h - (A/R)(T - Ta),
where Cv is the volumetric heat capacity of air, .018 BTU/ft3/Fo; V is the volume of the zone in ft3; T is the zone temperature in oF; t is time in minutes; F is volumetric air flow in CFM (ft3/min); Ti is inlet air temperature in oF; h is heat load in BTU/min from computer equipment, cookstoves, etc; A/R is wall heat transfer coefficient in BTU/min/Fo; and Ta is outside (ambient) air temperature in oF.
The units for variables given above are used for consistency in the differential equation. Units of some of the inputs to the ZONE_MDL block are different from those used in the differential equation; see the comments in the src view. These differences are accounted for in the calculation algorithms.
Last updated: 2011-01-04.
©2011 Holobloc Inc.
Licensed under the Academic Free License version 3.0.