HVAC Load Control for Stable Room Temperature and Energy Savings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air-conditioning system control devices fail to enhance operation efficiencies while maintaining a stable room temperature, as they either lack the ability to adjust heat loads or cause frequent temperature fluctuations.
Innovation Solution
An air-conditioning system control device that includes an air-conditioning apparatus data obtaining unit, a heat load estimation unit, and a control command determining unit to optimize operation frequencies and start-stop schedules of air-conditioning units based on permissible heat and temperature changes, ensuring energy-efficient operation within predetermined temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air-conditioning system control devices maintain constant room temperature depending on heat load, then room temperature stability is improved, but operation efficiency of air-conditioning apparatus cannot be increased
Solution Approach 1:
The patent applies dynamics by transitioning from static temperature maintenance to dynamic heat load adjustment. The control device dynamically modifies the heat load based on operation efficiency calculations, allowing the system to adapt its operating parameters in real-time rather than maintaining fixed temperature setpoints, thereby resolving the contradiction between stability and efficiency
Solution Approach 2:
The patent changes the controlled parameter from room temperature to heat load. Instead of adjusting temperature to maintain comfort, the system adjusts the heat load parameter within permissible ranges to optimize operation efficiency, while still maintaining temperature within acceptable boundaries through indirect control
2Loss of energy
If air-conditioning system control devices adjust heat load to increase operation efficiency, then operation efficiency is improved, but room temperature fluctuates frequently
Solution Approach 1:
The patent implements feedback control by continuously monitoring room temperature and using it to adjust heat load modifications. The control device calculates permissible heat load ranges based on current temperature conditions and adjusts the heat load accordingly, creating a closed-loop system that maintains temperature stability while optimizing efficiency through iterative adjustments
Solution Approach 2:
The patent applies preliminary action by calculating permissible heat load change ranges before actual heat load adjustments are made. The control device determines the maximum allowable heat load modification that will not cause excessive temperature fluctuations, then adjusts the heat load within these pre-calculated boundaries to prevent temperature instability
3Loss of energy
If air-conditioning system control devices stop air-conditioning apparatus to improve operation efficiency, then energy saving is improved, but room temperature changes frequently
Solution Approach 1:
The patent applies partial action by implementing partial load reduction rather than complete shutdown of air-conditioning apparatus. The control device calculates optimal heat load reductions that improve efficiency without completely stopping operation, maintaining sufficient cooling capacity to prevent temperature fluctuations while still achieving energy savings through reduced operational intensity
Data Source
AI summary
An air-conditioning system controller controls one or plural air-conditioning apparatus installed in a building, and includes a processor 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 processor divides the control-target period into time sections, 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, and a heat load to be processed by each air-conditioning apparatus, and determines, for each time section, as the air-conditioning apparatus control command, an operation frequency and start-stop of the air-conditioning apparatus, based on the heat-load change permissible range and an operation efficiency of the air-conditioning apparatus.