Air Conditioning Water Temperature Control for Outdoor Load Changes
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Solution Overview
Problem
Air conditioning systems face inefficiencies and comfort issues due to water temperature being set at a constant value, leading to overshooting or undershooting of indoor temperatures when outside air temperature changes, causing a lag in power adjustment by the heat source unit.
Innovation Solution
A temperature control system that adjusts the outlet water temperature of the heat source device based on outside air temperature changes, using a heat medium circuit, heat exchange device, and a controller to maintain indoor comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water temperature is maintained at a constant value, then system operation is simple, but indoor temperature overshooting or undershooting occurs when outside air temperature changes
Solution Approach 1:
The patent applies dynamics by transitioning from constant water temperature control to dynamic water temperature adjustment. The heat source device continuously adjusts water temperature based on real-time detection of outside air temperature and indoor temperature, ensuring the water temperature adapts to changing environmental conditions and load variations, thereby preventing indoor temperature overshooting or undershooting.
Solution Approach 2:
The patent implements feedback control by using temperature sensors to detect both outside air temperature and indoor temperature, then feeding this information back to the heat source device. The controller processes this feedback and adjusts the water temperature accordingly, creating a closed-loop control system that maintains stable indoor temperature despite external conditions changing.
2Reliability
If heat source unit power is adjusted based on indoor temperature variation, then indoor temperature control is achieved, but response lags behind outside air temperature changes
Solution Approach 1:
The patent applies preliminary action by using outside air temperature as a leading indicator to predict future heating or cooling demands. Since outside air temperature changes precede indoor temperature changes, the system adjusts water temperature in advance based on outside temperature variations, proactively compensating for the thermal inertia of the building before indoor temperature deviations occur.
Solution Approach 2:
The system dynamically adjusts water temperature based on the rate of change of outside air temperature. When outside temperature changes rapidly, the system responds more aggressively by adjusting water temperature at a higher rate, thereby reducing the time lag and maintaining better temperature control during transitional periods.
3Use of energy by moving object
If water temperature is adjusted according to load, then operating efficiency improves, but water temperature variation range must be optimized to prevent comfort degradation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting water temperature within an optimized variation range based on the current load conditions. The system calculates the appropriate water temperature deviation from the setpoint considering the magnitude of outside temperature changes and current indoor temperature, ensuring energy-efficient operation while maintaining comfort by preventing excessive temperature adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for high operating efficiency and comfort by dynamically adjusting water temperature in response to outside air temperature changes, preventing indoor temperature overshooting or undershooting and optimizing power usage.
Implementation Method 1
a heat source device 2 controlled to heat or cool a heat medium (water) flowing therein
Implementation Method 2
a heat exchange device 12 that exchanges heat with indoor air and controls an indoor temperature to a target temperature
Data Source
AI summary
The controller 31 performs a first control that controls a temperature of water (heat medium) flowing out of the heat source device 31 on the basis of an outside air temperature and a temperature difference between chronologically preceding and following outside air temperatures that are detected by the outdoor temperature sensor 21. The controller 31 controls the temperature of the indoor temperature to a target temperature by performing the first control.