Insulated Fluid Conduit with Phase Change Materials for Thermal Control
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Solution Overview
Problem
In cold environments, heated fluids in conduits are prone to solidification or becoming unmanageably viscous due to heat loss, leading to flow interruptions and phase changes, particularly in subsea hydrocarbon production operations where thermal control is critical.
Innovation Solution
An insulated fluid conduit design featuring multiple layers: a conduit inner surface defining a flow channel, an outer surface, a first insulating layer with a phase change material dispersed in a polymer matrix, a second insulating layer with another phase change material, and barrier layers to inhibit migration, where the melting points of the phase change materials are strategically chosen to maximize heat retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If passive insulation is used to prevent heat loss, then heat retention is improved, but the cooldown period is still insufficient for fluids susceptible to solidification
Solution Approach 1:
The patent incorporates phase change materials (PCMs) within the insulation layers that undergo phase transitions (melting/freezing) at temperatures near the fluid's operating temperature. When the fluid temperature drops, the PCMs melt and absorb latent heat, slowing the cooldown process and preventing the fluid from reaching its solidification point during interruptions.
Solution Approach 2:
The insulation system uses composite materials combining traditional insulating materials with phase change materials. This creates a multi-functional insulation layer that provides both thermal resistance and latent heat storage, extending the cooldown period beyond what passive insulation alone can achieve.
2Temperature
If active heating is applied along the conduit length, then heat loss compensation is improved, but system complexity and energy consumption increase
Solution Approach 1:
The phase change materials within the insulation layers provide self-regulating thermal control. When the fluid temperature drops toward the PCM melting point, the PCMs automatically melt and absorb heat, and when the fluid temperature rises, the PCMs freeze and release heat, eliminating the need for external active heating systems.
Solution Approach 2:
The patent extracts the active heating function from separate heating systems and integrates it directly into the insulation structure itself. The PCMs embedded in the insulation layers perform the heat compensation function locally within the insulation, eliminating the need for external heating equipment.
3Temperature
If multiple insulation layers with different phase change materials are used, then thermal control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The insulation system is divided into multiple layers, each containing phase change materials with different melting points tailored to specific temperature ranges. This segmentation allows precise thermal control at different temperature thresholds while maintaining manufacturing simplicity through modular layer construction.
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 design significantly extends the cooldown period of the fluid, preventing premature solidification and maintaining fluid flow by effectively managing heat retention through reversible phase changes, enhancing thermal control in cold environments.
Implementation Method 1
a first insulating layer comprising a first phase change material dispersed in a first polymer matrix; a second insulating layer comprising a second phase change material dispersed in a second polymer matrix
Implementation Method 2
effectively managing heat retention through reversible phase changes
Implementation Method 3
at least one barrier layer configured to inhibit migration of one or more of the first and second phase change materials into the environment
Implementation Method 4
a first phase change material dispersed in a first polymer matrix; a second phase change material dispersed in a second polymer matrix
Data Source
AI summary
The present invention provides an insulated fluid conduit useful in facilities in which a hot fluid susceptible to one or more deleterious phase changes in response to heat loss to a cold environment is transported. Such conduits may be particularly well suited to improve thermal control in subsea hydrocarbon production operations. The fluid conduit includes an inner first insulating layer containing a first polymer matrix, and a first phase change material undergoing a phase change at T1. The fluid conduit includes an outer second insulating layer containing a second polymer matrix, and a second phase change material undergoing a phase change at T2, wherein T1 is greater than T2. One or more barrier layers inhibit migration of the phase change material from the insulation layers and into the environment. In one or more embodiments, the phase change material is present as a microencapsulated phase change material.