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 language | English (US) |
|---|---|
| Pages (from-to) | 237-244 |
| Number of pages | 8 |
| Journal | ASHRAE Transactions |
| Volume | 99 |
| Issue number | pt 2 |
| State | Published - 1993 |
| Externally published | Yes |
| Event | Proceedings of the 1993 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. - Denver, CO, USA Duration: Jun 27 1993 → Jun 30 1993 |
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering