Humidity Controller Capacity Control for Stable Room Comfort
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Solution Overview
Problem
Existing air conditioning systems face challenges in simultaneously maintaining comfortable room temperature and relative humidity levels when both sensible and latent heat loads are processed, as changes in room temperature affect relative humidity, making it difficult to control both parameters effectively.
Innovation Solution
An air conditioning system that includes a humidity controller for processing latent heat and an air conditioner for processing sensible heat, with a control system that adjusts capacities based on target temperature and relative humidity settings, using a refrigerant circuit with adsorption heat exchangers to adjust humidity levels, allowing for simultaneous temperature and humidity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the capacity of the humidity controller is controlled on the basis of the relative humidity of the room at that point in time, then the humidity control responds quickly to current conditions, but it becomes difficult to maintain immediately both the room temperature and the relative humidity within comfortable ranges because room temperature changes with the operation of the air conditioner
Solution Approach 1:
The control device calculates the future room temperature that will be reached after the air conditioner operates to achieve the set temperature, and uses this predicted future temperature (rather than current temperature) as the basis for controlling the humidity controller's capacity. This preliminary calculation of future state allows the humidity control to anticipate temperature changes and adjust accordingly, maintaining both temperature and humidity within comfortable ranges simultaneously.
2Ease of operation
If both room temperature and relative humidity are controlled simultaneously, then comfortability is improved, but the control complexity increases because temperature changes affect relative humidity
Solution Approach 1:
The control device introduces an intermediary calculation step that converts the set temperature and current relative humidity into a set absolute humidity value. This absolute humidity serves as a mediator that decouples the interdependence between temperature and relative humidity control, allowing the air conditioner and humidity controller to operate independently while achieving coordinated comfort control. The control logic becomes simpler by using absolute humidity as the intermediate parameter rather than directly controlling relative humidity based on changing temperature.
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
The system effectively maintains room temperature and relative humidity at comfortable levels by adjusting the humidity controller's capacity to match target settings, ensuring immediate convergence to desired conditions without the need for additional input sections, using a simple configuration.
Implementation Method 1
an adsorption heat exchanger supporting an adsorbing agent which performs adsorption of moisture
Implementation Method 2
the adsorbing agent is refrigerated by the refrigerant evaporating in the adsorption heat exchanger
Implementation Method 3
the adsorbing agent is heated by the refrigerant condensed in the adsorption heat exchanger and the moisture adsorbed in the adsorbing agent is released
Data Source
AI summary
In an input section (30), a set temperature Ts which becomes a control target temperature of a humidity controller (10), and a set relative humidity Rs which becomes a control target humidity of the humidity controller (10) are set. An air conditioning control section (42) adjusts the temperature adjusting capacity of the humidity controller (10) such that the room temperature may come very close to the set temperature Ts. Further, an arithmetic section (33) calculates, as the target absolute humidity As, the absolute humidity which becomes the relative humidity set value Rs at the set temperature Ts. A humidity adjustment section (41) adjusts the humidity adjusting capacity of the humidity controller (10) such that the absolute humidity of the room may come very close to the target absolute humidity As.