Environmental control system and method

Data processing: generic control systems or specific application – Specific application – apparatus or process – Mechanical control system

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700278, G05B 1300

Patent

active

060061421

ABSTRACT:
The present invention provides a sequencing control strategy for environmental system controllers that takes better advantage of the capabilities of the system elements to enhance performance and reduce operating costs. Digital controller technology is included and operates in accordance with a state transition diagram clarifying conditions that must exist for the environmental controller to switch from one mode of operation to another (e.g., from a cooling mode with dampers set at the minimum position to a cooling mode with the dampers modulating to reduce the energy used for mechanical cooling). Several controllers, or a single controller operating on several sets of control parameters, sequentially operate in accordance with transition data and system performance characteristics for controlling system operation.

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J.E. Seem et al., "A New Sequencing Control Strategy for Air-Handling Units" International Journal of Heating, Ventilation, Air Conditioning and Refrigeration Research, ASHRAE, Jan., 1999.

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