Analysis of stability of livestock building heating/ventilation control systems

Y. Zhang, E. M. Barber, H. C. Wood

Research output: Contribution to journalConference articlepeer-review

Abstract

An important issue related to control systems is stability. In the future, as humidistats become available for use in livestock buildings, temperature-humidity control strategies will be used. Simulation results reported in this paper show that temperature control (TC) is absolutely stable and temperature-humidity control (THC) is conditionally stable. Two THC systems, humidistat-controlled heater and thermostat-controlled second-stage fan (THC1) and thermostat-controlled heater and humidistat-controlled second-stage fan (THC2), were investigated. An upper temperature limit to deactivate the heater for THC1 control should be devised; otherwise instability may occur when the weather is both warm and wet. A lower temperature limit to deactivate the second-stage fan for THC2 should be devised; otherwise instability may occur when the weather is cold. A THC system would likely give a wider temperature fluctuation than temperature-based control systems.

Original languageEnglish (US)
Pages (from-to)237-244
Number of pages8
JournalASHRAE Transactions
Volume99
Issue numberpt 2
StatePublished - 1993
Externally publishedYes
EventProceedings of the 1993 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. - Denver, CO, USA
Duration: Jun 27 1993Jun 30 1993

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Analysis of stability of livestock building heating/ventilation control systems'. Together they form a unique fingerprint.

Cite this