Humidity Controller Pressure-Differential Control for Reliable Switching
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Solution Overview
Problem
The existing humidity controllers with refrigerant circuits face issues due to large differences in high and low pressures, which can lead to operational troubles and potential damage to the switching mechanism, as they require alternating cooling and heating cycles for moisture adsorption and desorption.
Innovation Solution
Incorporating a differential pressure detection system and a control mechanism that adjusts the compressor capacity or stops it when pressure differences exceed certain thresholds, preventing excessive pressure variations and ensuring smooth operation of the switching mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching mechanism reverses refrigerant circulation flow to alternate cooling and heating of adsorbent heat exchangers, then moisture adsorption and desorption can be repeated alternately, but large pressure differences may cause switching troubles or mechanism breakdown
Solution Approach 1:
The control device detects the pressure difference between high and low pressure sides before switching occurs, and preemptively controls compressor capacity to reduce the pressure difference to below the third threshold value, preventing switching mechanism troubles before they happen
Solution Approach 2:
The control device continuously monitors the pressure difference between high and low pressure sides, uses this feedback information to dynamically adjust compressor capacity, and maintains pressure difference within safe operating limits for reliable switching
2Productivity
If the compressor operates at high capacity to meet humidity control demand, then productivity is improved, but the pressure difference between high and low pressure sides increases causing switching mechanism troubles
Solution Approach 1:
The compressor capacity is made dynamically adjustable based on real-time pressure difference conditions, allowing the system to optimize between productivity and reliability by varying compressor output rather than operating at fixed high capacity
Solution Approach 2:
The control device changes the operating parameters of the compressor (capacity/discharge amount) based on detected pressure difference values, adjusting the compression ratio and refrigerant circulation rate to maintain safe pressure differentials while meeting humidity control demands
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 solution effectively manages pressure differences, preventing damage to the switching mechanism and enhancing the reliability of the humidity controller by controlling compressor capacity based on detected pressure values.
Implementation Method 1
a differential pressure detection means for detecting a difference between high pressure and low pressure in the refrigeration cycle
Implementation Method 2
two adsorbent heat exchangers are included... On the adsorbent heat exchanger serving as the evaporator, the adsorbent is cooled by the refrigerant and adsorbs moisture in the air
Implementation Method 3
On the adsorbent heat exchanger serving as the condenser, the adsorbent is heated by the refrigerant and desorbs the moisture adsorbed thereon
Data Source
AI summary
A humidity controller includes a differential pressure detection means (93, 97) for detecting a difference between high voltage and low voltage in a refrigeration cycle of a refrigerant circuit (50) and a control means (30) for controlling the capacity of the compressor (53). The control means (30) reduces the capacity of the compressor (53) when a detected value of the differential pressure detection means (93, 97) exceeds a reduction threshold. Further, the control means (30) stops the compressor (53) when the detected value of the differential pressure detection means (93, 97) exceeds a stop threshold higher than the reduction threshold.