Air conditioning system control device and air conditioning system control method
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Solution Overview
Problem
Existing air-conditioning system control devices fail to increase operation efficiencies while maintaining a stable room temperature within a predetermined range, leading to inefficient energy usage and frequent temperature fluctuations.
Innovation Solution
An air-conditioning system control device that determines optimum control commands based on a heat-load change permissible range, calculated from a room-temperature change permissible range and the operation efficiency of the air-conditioning apparatus, to manage energy usage and maintain comfortable temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air-conditioning system control devices provide exact required capacity depending on heat load, then room temperature is maintained constant, but operation efficiency of air-conditioning apparatus is not improved
Solution Approach 1:
The control device performs preliminary actions by determining a heat-load change permissible range based on room-temperature change permissible range before controlling the air-conditioning apparatus. This allows the system to proactively adjust operations to maintain both temperature stability and improve operation efficiency, rather than simply reacting to maintain constant temperature.
2Use of energy by moving object
If air-conditioning apparatus is stopped when heat load decreases operation efficiency, then energy-saving operation is achieved, but room temperature changes frequently
Solution Approach 1:
The control device dynamically adjusts the operation of air-conditioning apparatus based on the determined heat-load change permissible range. Instead of statically stopping the apparatus when efficiency decreases, the system dynamically modulates operations within the permissible range, thereby achieving energy-saving operation while maintaining room temperature stability through flexible, real-time adjustments.
3Use of energy by moving object
If heat load is adjusted to increase operation efficiency, then energy-saving operation is achieved, but room temperature may exceed permissible range
Solution Approach 1:
The control device uses feedback by continuously monitoring whether room temperature remains within the permissible range and adjusting the heat load accordingly. The system determines the heat-load change permissible range based on the room-temperature change permissible range, creating a feedback loop that ensures energy-saving operation does not cause temperature to exceed acceptable limits.
Data Source
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AI summary
An air-conditioning system control device (41) controls one or a plurality of air-conditioning apparatus (21) installed in a building, and includes an air-conditioning apparatus data obtaining unit (64), a heat load estimation obtaining unit (62), and air-conditioning apparatus control command determining unit (63) that determines an air-conditioning apparatus control command so that a preset evaluation index satisfies a preset condition in a preset control-target period under a preset constraint. The air-conditioning apparatus control command determining unit (63) includes time sections to divide the control-target period by one or a plurality of preset division intervals, determines a room-temperature change permissible range within which a room temperature satisfies the constraint, determines a heat-load change permissible range, based on the room temperature, the room-temperature change permissible range, a heat load estimation (53), and a heat load to be processed by each of the air-conditioning apparatus (21), and determines, for each of the time sections, as the air-conditioning apparatus control command, an operation frequency and start-stop of the air-conditioning apparatus (21), based on the heat-load change permissible range and an operation efficiency of the air-conditioning apparatus (21).