Thermoelectric Pump Head Cooling for Supercritical Fluid Chromatography
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Solution Overview
Problem
Existing actuator systems for supercritical fluid chromatography lack effective cooling mechanisms to maintain the liquid state of carbon dioxide, which is crucial for maintaining the efficiency and accuracy of the chromatography process.
Innovation Solution
The integration of a thermoelectric cooling module within the actuator, comprising a Peltier device sandwiched between thermally conductive plates, allows for independent temperature control of the pump head by transferring heat from the pump head to the actuator body, enhancing thermal stability and control of fluid density regardless of ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If no cooling mechanism is integrated into the actuator, then the device complexity is reduced, but the thermal stability and ability to maintain liquid state of carbon dioxide deteriorates
Solution Approach 1:
The cooling module is integrated directly into the actuator body, merging the cooling function with the pumping function. The thermoelectric cooling device is positioned in thermal contact with the pump head through thermally conductive plates, allowing both cooling and pumping operations to occur within a single integrated unit, thereby improving thermal stability without proportionally increasing device complexity
Solution Approach 2:
The cooling module is nested within the actuator structure. The thermoelectric cooling device is housed inside the actuator body, with the cold plate in thermal contact with the pump head and the hot plate thermally coupled to the actuator body, creating a nested configuration where the cooling system is contained within the pumping system
2Adaptability or versatility
If ambient temperature varies, then adaptability to different environments is improved, but control of fluid density and mass flow precision deteriorates
Solution Approach 1:
The thermoelectric cooling module enables active temperature control of the pump head, creating a feedback mechanism that compensates for ambient temperature variations. By maintaining a stable thermal environment at the pump head regardless of external conditions, the system preserves precise control over fluid density and mass flow even when operating in varying environmental conditions
Solution Approach 2:
The cooling module applies localized thermal control specifically at the pump head region where carbon dioxide is stored and pressurized. The thermally conductive plates concentrate cooling效果 at the critical pump head area, maintaining local thermal stability and fluid density control while allowing other parts of the system to adapt to ambient 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
This solution improves the thermal stability and control of the pump head, enabling accurate mass flow and maintaining the liquid state of carbon dioxide, thereby enhancing the precision and reliability of supercritical fluid chromatography systems.
Implementation Method 1
The integration of a thermoelectric cooling module within the actuator, comprising a Peltier device sandwiched between thermally conductive plates, allows for independent temperature control of the pump head by transferring heat from the pump head to the actuator body
Implementation Method 2
The pump head is in thermal contact with the support plate. Means for cooling is disposed between and in thermal communication with the support plate and the actuator body
Data Source
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AI summary
An actuator has a support plate, a pump head in thermally conductive contact with the support plate, and an actuator body. Cooling means is disposed between the support plate and the actuator body. The cooling means is configured to remove and transfer heat from the pump head to the actuator body. In one embodiment, the cooling means includes two thermally conductive plates (called cold-side and hot-side plates) and a thermoelectric device disposed in thermally conductive contact between the cold-side and hot-side plates. The cold-side plate is in thermal communication with the pump head through the support plate. The hot-side plate is in thermal communication with the actuator body. The thermoelectric device is configured to transfer heat from the cold-side plate, which is in thermal communication with the pump head, to the hot-side plate, which is in thermal communication with the actuator body, thereby removing heat from the pump head.