Capacitance based liquid, ice, and frost sensor
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Solution Overview
Problem
Conventional cooling systems and HVAC systems struggle to detect early debris accumulation, such as ice and dust, which reduces efficiency and requires significant maintenance, often leading to downtime and increased operational costs.
Innovation Solution
A capacitance-based frost sensor system that includes co-planar plates and a measurement circuit to detect changes in capacitance between plates, allowing for early detection of debris buildup on evaporator coils, which can trigger a defrost cycle and maintain system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature or air flow monitoring is used to detect ice accumulation, then the system can detect accumulation, but only after it has reached a critical level requiring complete cleaning or de-icing
Solution Approach 1:
The capacitance sensor detects ice accumulation in the early stages before it reaches critical levels. By monitoring capacitance changes between the sensor plates, the system can identify frost buildup at its initial phases and trigger defrost cycles proactively, preventing the need for complete cleaning or de-icing operations that would cause system downtime.
Solution Approach 2:
The patent replaces conventional temperature or air flow monitoring methods with a capacitance-based sensing system. The capacitance sensor uses electrical field measurements rather than thermal or mechanical measurements to detect ice accumulation, enabling more sensitive and earlier detection of frost buildup on evaporator coils.
2Reliability
If complete cleaning or de-icing of coils is performed when accumulation reaches critical level, then the cooling system can be maintained, but further down time of the cooling system is caused
Solution Approach 1:
The capacitance sensor provides continuous feedback on the state of ice accumulation on the evaporator coils. This feedback enables the control system to monitor degradation in real-time and trigger defrost or cleaning operations at optimal moments, balancing the need for system maintenance with minimizing operational downtime. The system can respond to capacitance threshold exceedances without waiting for critical failure conditions.
3Productivity
If temperature and air flow monitoring is used in HVAC systems, then debris buildup can be detected, but reduced heating and cooling capacity is already available when buildup occurs
Solution Approach 1:
The capacitance sensor detects debris accumulation including dust and frost in the early stages before they significantly impact heating and cooling capacity. By identifying buildup at its initial phases, the system can schedule maintenance or cleaning operations proactively, preventing the degradation of thermal performance and maintaining optimal productivity throughout the HVAC system's operation cycles.
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
Enables timely detection and remediation of debris accumulation, reducing maintenance needs and operational costs by initiating defrost processes before efficiency is significantly impacted.
Implementation Method 1
The measurement circuit is configured to measure a capacitance sensed by the capacitance sensor, the measurement representing a change of material between the plates over time
Data Source
AI summary
A frost sensor, or a frost/ice/water sensor, and systems and methods of using the same, are provided herein. The frost sensor includes a body including a measurement circuit, and a capacitance sensor including two or more co-planar plates coupled to and extending laterally from the body. The measurement circuit is configured to measure a capacitance sensed by the capacitance sensor, the measurement representing a change of material between the plates over time. The frost sensor also includes at least one mounting component coupled to and extending laterally from the body. In some instances, the frost sensor is coupled to evaporator coils of a cooling system.