HVAC Fan and Coil Capacity Coordination for Space Temperature Control
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Solution Overview
Problem
HVAC systems face inefficiencies in regulating space temperature due to the lack of coordinated control between fan capacity and cooling/heating coil capacity, leading to suboptimal energy usage and comfort levels.
Innovation Solution
The method involves varying the fan capacity and discharge air temperature of the cooling/heating coil within predetermined limits to maintain or modulate space temperature, using a control module that coordinates fan and coil control modules to adjust fan speeds and air temperatures based on temperature sensors and space requirements, allowing for efficient regulation of airflow volume and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fan capacity and coil capacity are controlled independently, then the system structure is simple, but the energy efficiency and temperature regulation performance deteriorate
Solution Approach 1:
The patent combines fan capacity control and coil capacity control into a unified coordinated control system. The control module integrates both control functions, allowing the fan and coil to work together synergistically rather than independently, thereby improving energy efficiency while managing system complexity through integration.
Solution Approach 2:
The system dynamically adjusts fan capacity and coil capacity based on real-time temperature feedback and load requirements. The control module continuously modulates both parameters to optimize energy efficiency, transforming static independent control into dynamic coordinated control that adapts to changing conditions.
2Adaptability or versatility
If fan capacity is increased to meet higher cooling/heating demands, then the temperature regulation capability improves, but the energy consumption increases
Solution Approach 1:
The patent changes the operational parameters of the fan and coil by modulating fan capacity and coil discharge air temperature within predetermined ranges. This allows the system to meet varying temperature regulation demands while optimizing energy consumption by adjusting parameters dynamically rather than operating at fixed high-capacity settings.
Solution Approach 2:
The system applies partial action by modulating fan and coil capacities to the extent necessary to meet space temperature requirements, rather than operating at full capacity continuously. The coordinated control ensures that neither component operates excessively, reducing energy loss while maintaining adequate temperature regulation capability.
3Productivity
If the coil discharge air temperature is lowered to increase cooling capacity, then the cooling effect improves, but the risk of freezing and energy inefficiency increases
Solution Approach 1:
The control module uses feedback from temperature sensors to monitor coil discharge air temperature and adjusts fan and coil capacities accordingly. This feedback mechanism prevents the coil discharge air temperature from dropping too low by coordinating fan speed adjustments with coil capacity changes, thereby eliminating freezing risk while maintaining cooling capacity.
Solution Approach 2:
The system applies counterbalancing control where increased coil cooling capacity is offset by coordinated fan capacity adjustments. When the coil operates at higher capacity with lower discharge air temperature, the fan capacity is modulated to prevent excessive temperature drops that could cause freezing, creating a counterbalancing effect that maintains safety while preserving productivity.
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 enhances the efficiency of HVAC systems by optimizing fan and coil operations to maintain desired space temperatures while minimizing energy consumption, allowing for flexible adaptation to changing load requirements.
Implementation Method 1
The discharge fans and/or the cooling/heating coils can be controlled to regulate a volume and/or a temperature of the airflow
Implementation Method 2
The discharge fans may be configured to drive airflow through the cooling/heating coils to control a space temperature
Data Source
AI summary
A method for regulating a discharge fan and a coil of a heating, ventilation, and air conditioning (“HVAC”) system includes maintaining a discharge fan capacity at a low fan capacity setting and varying a coil discharge air temperature between a low discharge air temperature limit and a high discharge air temperature limit. The method also includes, when the coil discharge air temperature reaches the low discharge air temperature limit, varying a fan speed of the variable speed discharge fan between a low fan speed setting and a high fan speed setting so as to maintain a space temperature at a space temperature setpoint set for a space, while maintaining the coil discharge air temperature at the low discharge air temperature limit.