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Object-oriented programming of HVAC control devices.

Author(s) : FRENCH J. C.

Type of article: Article

Summary

Historically, control software for building management systems has been written individually, line by line, by skilled programmers. An expensive process requiring testing and debugging during commissioning. It has become obvious that a system broken down into simple standard components obviates many error possibilities and is cheaper. Object-oriented programming offers the building of a total program for control of a complex HVAC system by the linking of standard objects. Just as an engineering system might operate by linking a sensor, a controller, and a control valve, a control program might link an input object, a PID loop object, and an analog output object to utilize the sensor input to operate the control valve. The engineering system is a set of standard items, so is its control. The author explains this theme in detail, building from an historical concept, showing how standard objects can be modified when required and adapted to link with other systems within a building. D.W.H.

Details

  • Original title: Object-oriented programming of HVAC control devices.
  • Record ID : 1992-2923
  • Languages: English
  • Source: ASHRAE Journal - vol. 33 - n. 12
  • Publication date: 1991/12
  • Document available for consultation in the library of the IIR headquarters only.

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