Condensate Tray Heating Control for Heat Exchanger Defrosting
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Solution Overview
Problem
Existing condensate recovery systems in heat exchangers face high electrical energy consumption due to continuous heating to prevent freezing, as the heating elements are activated based on outside temperature and not specifically when condensates are generated or at risk of freezing.
Innovation Solution
A system where the heating element in the condensate recovery tank is controlled by a thermostat that measures air temperature and only activates when both defrosting of the heat exchanger and a risk of freezing are detected, ensuring heating only occurs when necessary, thus reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating elements are continuously activated to prevent condensate freezing in the tray, then the reliability of condensate evacuation is improved, but the electrical energy consumption increases significantly
Solution Approach 1:
The heating element's operational state is dynamically adjusted based on real-time detection of defrosting conditions and temperature thresholds. The system transitions from static continuous heating to dynamic conditional heating, activating heating only when defrosting is detected and temperature is below the freezing point, thereby maintaining reliability while reducing energy consumption.
Solution Approach 2:
The system employs a feedback mechanism where the microcontroller continuously monitors defrosting status and tray temperature, comparing actual conditions against predetermined thresholds. This closed-loop feedback control enables the system to activate heating elements only when necessary (during defrosting operations and below freezing temperatures), eliminating unnecessary energy consumption while ensuring condensate evacuation reliability.
2Reliability
If heating elements operate continuously during the heating season, then the risk of condensate freezing is eliminated, but the operational time of heating elements increases to approximately 60% of the heating season
Solution Approach 1:
The heating element's operational duration is dynamically controlled based on real-time detection of defrosting conditions and temperature thresholds. The system transitions from static continuous heating (60% of heating season) to dynamic conditional heating (less than 1% of heating season), activating heating only when defrosting is detected and temperature is below freezing, thereby maintaining freezing prevention while dramatically reducing operational time.
Solution Approach 2:
The microcontroller continuously monitors defrosting status and tray temperature, comparing actual conditions against predetermined thresholds. This feedback control enables the system to activate heating elements only when both conditions are met (defrosting detected and temperature below freezing), reducing operational time from 60% to less than 1% of the heating season while maintaining effective freezing prevention.
3Reliability
If heating elements are activated based on outside temperature alone, then freezing conditions are addressed, but heating operates even when condensates are not generated during cooling operations
Solution Approach 1:
The heating element's operational state is dynamically determined by combining two conditions: defrosting detection and temperature threshold. The system transitions from temperature-based activation alone to dual-condition activation, ensuring heating occurs only when both defrosting is detected (indicating condensate generation) and temperature is below freezing, thereby eliminating unnecessary heating during cooling operations while maintaining freezing protection when needed.
Solution Approach 2:
The microcontroller monitors both defrosting status and tray temperature, requiring both conditions to be satisfied before activating heating elements. This dual-condition feedback control prevents unnecessary heating during cooling operations (when no condensates are generated) while ensuring heating activation during defrosting operations when condensates are generated and freezing risk exists, eliminating energy waste while maintaining freezing protection.
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 approach significantly minimizes electrical energy consumption by limiting heating to less than 1% of the heating season, as the heating element only operates when condensates are generated and at risk of freezing, while not interfering with the automatic defrosting system of the heat exchanger.
Implementation Method 1
at least one heating element which is able to heat at least one zone of said tank
Implementation Method 2
at least one thermostat which is able to measure the temperature of the air in the environment in which said tank is placed
Implementation Method 3
a heat exchanger which is capable of undergoing defrosting operations and of generating condensates
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to a system for managing the recovery and evacuation in liquid form of condensates from a heat exchanger, comprising: - a heat exchanger capable of undergoing defrosting operations and of generating condensates, - a tank ( 42) for recovering liquid condensates which has an opening (46) through which the condensates are evacuated, - a thermostat (90) able to measure the temperature of the air in the environment in which the tray is placed and to compare it with a set value representative of a risk of freezing of the condensates, - a heating element (60) able to heat a zone of the tank in the event of defrosting of the exchanger and when the measured temperature of the air of the environment in which is tank is lower than the set value.