Dehumidifier Speed Control Under Current Limits and Defrost Delay
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Solution Overview
Problem
Dehumidifying systems face inefficiencies due to fixed compressor and fan speeds, leading to reduced capacity or efficiency, and risk of exceeding circuit current requirements, especially under low temperature conditions with ice buildup on evaporator coils, and require more energy when using desiccant systems.
Innovation Solution
A dehumidifying system with a controller that adjusts the speed of the compressor and fan based on current and temperature thresholds, using ambient sensors and user inputs to optimize performance and delay defrost cycling, thereby maintaining efficient operation and maximizing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed compressor and fan speeds are used, then system simplicity is maintained, but system performance and capacity are reduced
Solution Approach 1:
The patent applies dynamics by transitioning from fixed-speed operation to variable-speed operation of the compressor and fan. The controller dynamically adjusts the speeds based on real-time monitoring of current draw, temperature, and humidity conditions, allowing the system to optimize performance across different operating scenarios rather than being constrained to predetermined settings.
Solution Approach 2:
The patent implements parameter changes by modifying operational parameters (compressor speed, fan speed) based on measured system conditions. The controller continuously monitors current draw, temperature, and humidity, then adjusts speeds to maintain optimal dehumidification capacity while preventing excessive current consumption and delaying defrost cycles.
2Productivity
If higher compressor and fan speeds are used, then dehumidification capacity is increased, but current draw exceeds circuit requirements
Solution Approach 1:
The patent implements feedback control by continuously monitoring the current draw of the compressor and fan, comparing it against predetermined thresholds, and adjusting speeds accordingly. When current draw approaches problematic levels, the controller reduces speeds to stay within safe operational limits while maintaining adequate dehumidification performance.
Solution Approach 2:
The system dynamically adjusts compressor and fan speeds based on real-time electrical load conditions. Rather than operating at fixed high speeds that exceed circuit requirements, the speeds are continuously adapted to match actual dehumidification needs while maintaining current draw within safe thresholds.
3Use of energy by moving object
If fixed operation settings are used, then system operation is simplified, but efficiency decreases under varying environmental conditions
Solution Approach 1:
The patent applies parameter changes by adjusting compressor and fan speeds based on measured environmental conditions including temperature and humidity. The controller modifies operational parameters in response to changing conditions, optimizing energy efficiency across different operating scenarios rather than relying on fixed settings that become inefficient as conditions vary.
Solution Approach 2:
The system uses feedback from temperature and humidity sensors to continuously optimize operational efficiency. The controller receives feedback on environmental conditions and adjusts speeds to maintain peak efficiency, preventing energy waste that would occur with fixed-speed operation under varying conditions.
4Reliability
If compressor speed is increased to prevent ice buildup, then defrost cycling is delayed, but current draw increases
Solution Approach 1:
The patent implements feedback control by monitoring both current draw and temperature conditions simultaneously. The controller uses this combined feedback to make intelligent decisions about compressor speed adjustment, balancing the need to delay defrost cycling with the constraint of maintaining current draw within safe thresholds.
Solution Approach 2:
The system applies parameter changes by adjusting compressor speed based on the interplay between temperature conditions (which indicate ice buildup risk) and current draw measurements. This coordinated parameter adjustment allows the system to delay defrost cycling while preventing excessive current consumption.
Data Source
AI summary
A dehumidifying system and method for reducing humidity in ambient air is disclosed. The system includes a circulation unit, a refrigeration unit, a condensate receptacle for receiving condensate generated by the refrigeration unit, a controller to control both the circulation and refrigeration units, and wherein the controller receives input from one or more ambient sensors configured to sense ambient conditions, and a user interface configured to receive input from a user. The system implements variable speed control within the circulation and/or refrigeration unit to maximize efficiency or capacity under a current threshold, and enables the system to delay the need for defrost cycling during low temperature operation.