Fan Convector Cooling Control Using Perceived Temperature and Humidity
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Solution Overview
Problem
Existing heating and cooling systems in cooling mode often end the operation of the blower convector prematurely, leading to uncomfortable conditions for users and unnecessary energy consumption, as they do not account for the perceived room temperature and relative humidity.
Innovation Solution
The system controls the cooling operation of the blower convector by taking into account the perceived room temperature, in addition to the measured room air temperature and relative humidity, to determine a corrected room temperature set value, thereby ensuring user comfort and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fan coil unit operates based solely on room air temperature control, then the system简单易操作, but the operation terminates prematurely when the setpoint temperature is reached, leading to uncomfortable conditions for users
Solution Approach 1:
The control system continuously monitors both room air temperature and relative humidity, using this feedback to dynamically adjust the fan coil unit operation. The perceived room temperature is calculated from temperature and humidity measurements, creating a closed-loop control system that maintains user comfort without requiring manual intervention.
Solution Approach 2:
The system changes the control parameter from simple air temperature to a composite perceived room temperature that incorporates both temperature and relative humidity. This parameter transformation allows the system to accurately reflect user comfort conditions and prevent premature termination of cooling operation.
2Loss of energy
If the fan coil unit stops operating when the setpoint room air temperature is reached, then energy consumption is reduced, but the perceived room temperature may still be too warm for user comfort
Solution Approach 1:
The control element continuously monitors perceived room temperature (derived from temperature and humidity) and adjusts fan coil operation accordingly. This feedback mechanism ensures the system runs long enough to achieve actual user comfort while avoiding unnecessary extended operation that would waste energy.
Solution Approach 2:
The system dynamically adjusts the effective setpoint temperature based on current humidity conditions. When humidity is high, the effective setpoint is lowered, extending operation until comfort is achieved. When humidity is low, the setpoint can be higher, allowing earlier termination. This dynamic adjustment optimizes the balance between comfort and energy consumption.
3Reliability
If the user manually adjusts the setpoint to achieve comfortable conditions, then user comfort is improved, but the system requires continuous user intervention and may lead to unnecessary energy consumption
Solution Approach 1:
The control system automatically calculates perceived room temperature from sensor measurements and adjusts fan coil operation accordingly, without requiring user intervention. The system serves itself by using its own sensors and control logic to maintain comfort conditions, eliminating the need for users to manually adjust setpoints.
Solution Approach 2:
The system uses feedback from temperature and humidity sensors to automatically determine when comfort conditions are achieved. This closed-loop control replaces manual user adjustment with automated decision-making, maintaining comfort while reducing user burden and preventing unnecessary energy consumption from frequent setpoint changes.
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 prevents premature termination of the blower convector's operation, maintains comfortable conditions for the user, and reduces energy consumption by adjusting the cooling operation based on perceived temperature and humidity levels.
Implementation Method 1
The dehumidification of the air that occurs when a fan coil unit is used in cooling mode
Implementation Method 2
The dehumidification of the air that occurs when a fan coil unit is used in cooling mode
Implementation Method 3
means for detecting the room air temperature and relative humidity
Implementation Method 4
means for detecting the room air temperature and relative humidity
Data Source
Figure 1
AI summary
The present invention relates to a method for controlling a heating and cooling system in cooling mode, wherein the heating and cooling system comprises at least one fan convector, a control element, means for detecting the room air temperature and the relative humidity, and means for inputting a room temperature setpoint by a user, wherein the control element determines a corrected room temperature setpoint T_air_set_new from the room temperature setpoint T_air_set, the detected room air temperature T_air, and the detected relative humidity, and wherein the cooling mode of the heating and cooling system is based on the corrected room temperature setpoint T_air_set_new.Furthermore, the present invention relates to a heating and cooling system comprising at least one fan convector, a control element and means for detecting the room air temperature and relative humidity, as well as means for inputting a room temperature setpoint by a user, wherein the control element is designed to specify the process steps for carrying out such a process.