Method for controlling fan coil units and method for calculating heat transfer amount
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Solution Overview
Problem
Existing methods for controlling fan coil units in perimeter zones of buildings fail to consider heat loads, leading to inefficient use of cold or hot water and increased energy consumption.
Innovation Solution
A method for controlling fan coil units by dividing them into groups based on installation direction, determining a drawn-air temperature setting for each group, and adjusting the supply of cold or hot water to match the calculated heat load, allowing for efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If real time inverter control is executed based on heat load, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent pre-calculates and stores optimal drawn-air temperature settings for different outdoor temperatures and heat load conditions before actual operation. During runtime, the system simply retrieves the pre-determined settings based on current outdoor temperature, avoiding complex real-time calculations while maintaining energy efficiency.
Solution Approach 2:
The system dynamically adjusts the drawn-air temperature setting based on outdoor temperature variations and heat load conditions. By making the temperature setting variable rather than fixed, the system adapts to changing environmental conditions to optimize energy efficiency without requiring advanced control algorithms.
2Loss of energy
If drawn-air temperature setting is optimized considering heat load, then heat consumption energy is reduced, but control complexity increases
Solution Approach 1:
Optimal drawn-air temperature settings are pre-determined and stored in a lookup table based on outdoor temperature and heat load conditions. The control system simply retrieves the appropriate setting from the table rather than calculating it in real-time, reducing control complexity while maintaining energy optimization.
Solution Approach 2:
The patent replaces complex thermal calculations and control algorithms with a simple lookup table approach. Instead of performing real-time heat load calculations and iterative optimization, the system uses pre-computed data to determine optimal settings, significantly simplifying the control mechanism.
3Reliability
If fan coil units are controlled to maintain constant set temperature, then indoor comfort is improved, but cold water or hot water is wasted
Solution Approach 1:
The system dynamically adjusts the drawn-air temperature setting based on outdoor temperature and heat load conditions rather than maintaining a fixed set temperature. This dynamic adjustment allows the system to adapt to changing environmental conditions, maintaining comfort while avoiding energy waste during periods of low heat load.
Solution Approach 2:
The patent changes the control parameter from a fixed set temperature to a variable drawn-air temperature setting that depends on outdoor temperature and heat load. By changing this parameter dynamically, the system optimizes energy usage while maintaining adequate indoor comfort levels.
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 reduces heat consumption energy by optimizing the drawn-air temperature settings and water supply, making it applicable to existing control systems without requiring advanced control devices.
Implementation Method 1
the air that has been heat-exchanged with cold water or hot water in a heat exchange coil
Implementation Method 2
Each fan coil unit takes in indoor air and blows out the air that has been heat-exchanged with cold water or hot water
Data Source
AI summary
A method for controlling fan coil units is provided which is simple and can efficiently use cold water or hot water considering a heat load in a perimeter zone. The method is a method for controlling the fan coil units installed in the perimeter zone and includes a first step of dividing the fan coil units into groups based on a direction of an installation position of each fan coil unit and determining a predetermined drawn-air temperature setting for each group in advance and a second step of, during operation of the fan coil units, controlling supply of cold water or hot water to each fan coil unit and stop of the supply in accordance with the drawn-air temperature setting determined in advance for each group. The first step includes a third step of calculating a heat load in each direction in the perimeter zone and a fourth step of determining the drawn-air temperature setting for each group in accordance with the heat load having been calculated.