Electric Heat Trace Control for Freeze Prevention and Energy Savings
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Solution Overview
Problem
Existing electric heat trace (EHT) circuits in piping systems face inefficiencies due to constant energization, leading to energy waste and equipment wear, as they either maintain fluid temperature above a setpoint or risk fluid freezing when de-energized.
Innovation Solution
An EHT control system that utilizes temperature and flow sensors to dynamically manage the energization of heat trace cables based on fluid temperature and flow status, incorporating weather data to optimize energy use and prevent freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EHT circuit is constantly energized to maintain fluid temperature above the setpoint, then the fluid remains liquid and flowable, but energy consumption increases and equipment wear increases
Solution Approach 1:
The EHT circuit transitions from static constant energization to dynamic control based on real-time temperature and flow conditions. The controller continuously monitors sensor data and adjusts the energization state, enabling the system to adapt to changing conditions and energize only when necessary, thus reducing energy consumption while maintaining fluid flow reliability.
Solution Approach 2:
The system implements feedback control by using temperature sensors and flow sensors to monitor the actual state of the fluid and piping system. This feedback information is fed back to the controller, which then adjusts the EHT circuit energization accordingly, ensuring the fluid remains above the setpoint temperature only when necessary, thereby reducing energy waste.
2Use of energy by moving object
If the EHT circuit is de-energized to save energy, then energy consumption decreases, but the fluid may freeze or become too viscous to flow properly
Solution Approach 1:
The system takes preliminary action by continuously monitoring temperature and flow conditions before the fluid actually freezes or becomes too viscous. The controller anticipates potential freezing conditions and energizes the EHT circuit in advance, preventing fluid freezing while avoiding unnecessary continuous energization, thus balancing energy savings with flow reliability.
Solution Approach 2:
Real-time feedback from temperature and flow sensors enables the controller to detect conditions approaching freezing thresholds and respond by energizing the EHT circuit only when needed, preventing fluid freezing while minimizing energy consumption.
3Reliability
If the EHT circuit is constantly energized to prevent freezing, then the fluid remains flowable, but unnecessary energy is wasted when fluid is already flowing
Solution Approach 1:
The system dynamically adjusts EHT circuit energization based on real-time flow conditions detected by the flow sensor. When fluid flow is detected, the controller de-energizes the EHT circuit since flowing fluid does not require heating to maintain flowability. When flow stops or slows, the controller energizes the circuit to prevent freezing, thus eliminating energy waste while maintaining flow reliability.
Solution Approach 2:
The flow sensor provides feedback about the actual fluid flow state to the controller. This feedback enables the controller to distinguish between periods when heating is necessary (no flow or low flow) and periods when heating is unnecessary (adequate flow), thereby eliminating energy waste during flowing conditions while maintaining fluid flow reliability during stagnant conditions.
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 system efficiently manages EHT circuits by only energizing when necessary, reducing energy consumption and equipment wear while maintaining fluid temperature, thus enhancing operational efficiency and energy savings.
Implementation Method 1
the heat trace cable connected to that wireless module conducts current, and thereby heats the vessel contacting the heat trace cable
Data Source
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AI summary
Embodiments of the invention provide an electric heat trace (EHT) control system for use with a piping system having pipes and capable of transporting a fluid. The EHT control system includes an EHT circuit for heating the piping system, a temperature sensor outputting a temperature value, a flow status sensor outputting a flow status value, and an EHT management system. The EHT management system can include a controller connected to the EHT circuit in order to selectively energize the EHT circuit. The controller can be connected to the temperature sensor in order to receive the temperature value and the flow status sensor in order to receive the flow status value. The controller can be configured to execute an EHT management program including the steps of receiving the temperature value, receiving the flow status value, and utilizing the temperature value and/or the flow status value to determine whether or not to energize the EHT circuit.