Immiscible Fluid Heat Transfer With Membrane Separation
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Solution Overview
Problem
Existing heat transfer technologies face challenges with corrosive and incompatible fluid additives in heat exchangers, requiring expensive materials or inferior thermal conductivity to prevent corrosion, and fail to effectively recover thermal energy from salt solutions like seawater.
Innovation Solution
The use of immiscible fluids with specific heat capacity matching and omniphobic or hydrophilic membranes for gravity separation after heat transfer, allowing direct heat transfer from a non-corrosive first fluid to a second fluid with additives, and subsequent filtration to isolate additives, thereby minimizing exposure to the heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional heat exchangers are used with corrosive fluid additives, then heat transfer can be achieved, but corrosion and fouling occur requiring expensive materials
Solution Approach 1:
An immiscible intermediate fluid is introduced between the corrosive brine and the heat exchanger surfaces. This intermediate fluid acts as a mediator that transfers thermal energy from the brine to the heat exchanger without allowing direct contact between the corrosive additives and the heat exchanger materials, thereby preventing corrosion and fouling while enabling efficient heat transfer
Solution Approach 2:
The heat transfer process is segmented into two distinct stages: first, heat transfer from the brine to the immiscible intermediate fluid occurs without direct contact with heat exchanger surfaces; second, the intermediate fluid transfers heat to the heat exchanger. This segmentation isolates the corrosive brine from the heat exchanger, allowing use of cost-effective materials
2Loss of energy
If heat exchangers are exposed to salty water, then heat transfer occurs, but thermal energy recovery is inefficient
Solution Approach 1:
The immiscible intermediate fluid serves as an intermediary that enables efficient thermal energy recovery from brine. The fluid's immiscibility with brine prevents contamination while its thermal properties facilitate effective heat transfer, allowing recovery of thermal energy that would otherwise be lost
3Reliability
If expensive corrosion-resistant materials are used, then corrosion resistance improves, but thermal conductivity decreases
Solution Approach 1:
The immiscible intermediate fluid acts as a thermal intermediary that decouples the requirements for corrosion resistance and thermal conductivity. The heat exchanger can use cost-effective materials with good thermal conductivity since they only contact the non-corrosive intermediate fluid, while the corrosive brine is isolated by the intermediate fluid barrier
Solution Approach 2:
Different regions of the system have different functional requirements: the intermediate fluid contacts both the brine (requiring chemical inertness) and the heat exchanger (requiring good thermal conductivity). This local differentiation allows optimization of material properties in different zones, using cost-effective materials where thermal conductivity is critical
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 enhances heat transfer efficiency, reduces corrosion, and allows for effective thermal energy recovery, achieving a higher mass flow rate with minimal pressure differential and reduced fouling, while using cost-effective materials.
Implementation Method 1
direct heat transfer from a non-corrosive first fluid to a second fluid with additives
Implementation Method 2
heat transfer predominantly for the purpose of vaporizing a constituent of a working fluid
Implementation Method 3
omniphobic or hydrophilic membranes for gravity separation after heat transfer
Implementation Method 4
subsequent filtration to isolate additives
Data Source
AI summary
The heat exchangerless membrane system optimizes heat transfer between a set of two immiscible fluids such that the second of the two immiscible fluids having an additive, notably an additive that makes the second fluid corrosive, is infrequently in contact any heat exchangers that would make the heat exchanger subject to corrosion. This membrane system is capable of separating the two immiscible fluids downstream of the heat transfer process, such that heat transfer can repeat the cycle again in an energy efficient manner.