ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.
Scope
"Abstract One of the main goals of ventilation is to create a favorable thermal condition inside a compartment. The efficiency of a ventilation system to achieve this goal depends on many factors such as: air flow rate@ incoming air temperature@ air flow pattern etc. For this purpose@ there is need for a control system which can provide proper inlet conditions resulting the required output at a specific location. The main objective of this paper is to examine the possibility to control the temperature in a ventilated chamber in different spatial regions individually. Twenty two-dimensional spatially fixed and equal square cells in a small ventilated test chamber (0.70??0.65??0.4 m; 27.56""??25.60""??15.75"") were used. Step inputs in ventilation rate and inlet air temperature are applied and temperature responses at 30 sensor locations are recorded. First order transfer function data-based models are identified for modeling the dynamic behavior of temperature in each of the 20 cells. A Proportional-Integral-Plus PIP control system is designed based on the identified models to control the temperature in each of the 20 cells individually."