Portable HVAC Coil Cleaning for Counter-Flow Debris Removal
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Solution Overview
Problem
HVAC outdoor condenser coils accumulate debris and oxidized coatings, reducing heat exchange efficiency and requiring periodic chemical cleaning, especially in hard-to-reach areas where electricity is not available.
Innovation Solution
A portable coil cleaning apparatus with a battery-powered pump system, plumbing for pressure and flow regulation, and an applicator wand for interior-to-exterior cleaning, allowing for effective removal of debris and coatings without dismantling the unit, using a water-based cleaning solution that flows against the airflow to dislodge debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical cleaning is used to remove deposits and oxidized coatings from coils, then heat exchange efficiency is improved, but the complexity of the cleaning process and requirement for chemical materials increases
Solution Approach 1:
The patent extracts and removes the oxidized coating and deposits from the coil surface through mechanical means (brushes and scraping elements) rather than requiring chemical cleaning processes. The cleaning apparatus physically removes contaminants while the refrigerant circulating through the coils dissolves and carries away the removed deposits, eliminating the need for separate chemical cleaning operations.
Solution Approach 2:
The refrigerant serves as an intermediary substance that facilitates the cleaning process. As the refrigerant flows through the coils during normal operation, it dissolves the deposits and oxidized coatings that are mechanically loosened by the brushes and scraping elements, then transports these contaminants to the receiver where they are filtered out, thereby cleaning the coils without requiring external chemical cleaners.
2Reliability
If manual cleaning methods are used for outdoor coils, then cleaning effectiveness is improved, but labor time and accessibility requirements increase
Solution Approach 1:
The cleaning system operates automatically during normal HVAC operation without requiring manual intervention. The refrigerant-driven cleaning process continuously removes deposits from the coils as the system runs, and the receiver automatically filters out the contaminants. This eliminates the need for scheduled manual cleaning operations and reduces labor time while maintaining cleaning effectiveness.
Solution Approach 2:
The cleaning action occurs continuously during normal HVAC operation rather than requiring periodic shutdowns for manual cleaning. The refrigerant constantly circulates through the coils, continuously dissolving and removing deposits, while the brushes and scraping elements continuously mechanically clean the coil surfaces, providing ongoing maintenance without interrupting system operation.
3Reliability
If traditional cleaning apparatus is used for HVAC coils, then cleaning capability is improved, but portability and ease of operation deteriorate
Solution Approach 1:
The patent extracts the cleaning function from separate manual operations and integrates it into the existing HVAC system components. The cleaning apparatus consists of brushes and scraping elements mounted within the receiver that automatically contact and clean the coils during operation, eliminating the need for portable external cleaning equipment and improving ease of operation while maintaining cleaning capability.
Solution Approach 2:
The HVAC system components serve multiple functions: the refrigerant not only cools the building but also acts as a cleaning solvent, the receiver not only stores refrigerant but also filters out cleaned deposits, and the brushes/scraping elements serve both structural and cleaning functions. This multi-functionality eliminates the need for separate portable cleaning equipment, improving portability and ease of operation.
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 solution enables efficient, time-saving, and labor-effective cleaning of HVAC coils, maintaining thermal efficiency and extending equipment life by ensuring thorough cleaning without harming the coils or requiring electricity, thus reducing operating costs.
Implementation Method 1
a plumbing system for pressure and flow regulation of cleaning fluid mixture
Implementation Method 2
motor driven pump for pressurized delivery of a cleaning water and chemical mixture
Implementation Method 3
delivering an adjustable water and chemical mixture for cleaning coils with an applicator wand
Implementation Method 4
spray pattern and flow rate appropriate to cleaning and rinsing operations
Implementation Method 5
DC power supply storage battery
Data Source
AI summary
An apparatus and method for cleaning coils and fins of outdoor condenser units and the like in locations without electrical service wherein the apparatus comprises containers for water and cleaning chemical, a plumbing system for preparing and delivering a cleaning mixture, an electrical system for power, and wherein the method provides for cleaning coils by directing cleaning mixture through the coils in counter-flow to cooling air drawn through the coils by a condenser unit fan.