Fin-Type Condensate Cooler Layout for Wide-Range Reference Humidity
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Solution Overview
Problem
Existing humidity reference devices face challenges in accurately representing low dewpoint temperatures due to technical issues such as pressure losses, short service life, and limitations in high-temperature operations, especially when using ice-based systems, which lead to measurement errors and instability.
Innovation Solution
A device with a fin-type condensate cooler arranged for horizontal gas flow, featuring two partial condensate coolers in series and a pre-condenser, ensures stable condensate management and minimizes pressure losses, allowing for dewpoint temperature control between -60°C and 90°C by varying pressures and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ice-based systems are used for low dewpoint temperature representation, then the dewpoint range is extended to lower temperatures, but pressure losses increase and service life decreases
Solution Approach 1:
The condensate cooler is divided into multiple sections with different orientations. The lower section has vertical fins for ice-based humidity representation at low dewpoints, while the upper section has horizontal fins for water-based representation at higher dewpoints. This segmentation allows the system to operate in different modes without the drawbacks of using a single configuration for the entire temperature range.
Solution Approach 2:
The system dynamically switches between ice-based and water-based humidity representation modes depending on the required dewpoint temperature. The condensate cooler can operate with vertical fin configuration for low temperatures (ice mode) and horizontal fin configuration for higher temperatures (water mode), adapting its structure to the operational requirements to optimize performance and reliability.
2Temperature
If vertical fin condensate coolers are used for ice-based humidity representation, then low dewpoint temperatures are achieved, but pressure losses increase due to condensate accumulation
Solution Approach 1:
The condensate cooler is segmented into vertical and horizontal fin sections. The vertical fin section is used only when ice-based humidity representation is required, accepting that pressure losses occur in this mode. The horizontal fin section is used for water-based representation where pressure losses are minimized. This segmentation allows the system to optimize for each operational mode separately.
Solution Approach 2:
The system uses an intermediary approach by providing two distinct fin configurations that can be selectively activated. The vertical fins act as an intermediary structure specifically for ice-based operation, while horizontal fins serve as the intermediary for water-based operation, allowing the system to transition between modes based on operational requirements.
3Stress or pressure
If horizontal fin condensate coolers are used for water-based humidity representation, then pressure losses are minimized, but service life is reduced due to condensate accumulation on fins
Solution Approach 1:
The condensate cooler is segmented into distinct vertical and horizontal fin sections. The horizontal fin section is dedicated to water-based humidity representation where pressure losses are minimized, while the vertical fin section handles ice-based operation. This segmentation prevents condensate accumulation issues in the horizontal section by restricting its use to water-based modes only.
4Device complexity
If a single condensate cooler configuration is used for both ice and water-based methods, then device complexity is reduced, but measurement precision decreases due to condensate accumulation
Solution Approach 1:
The condensate cooler is segmented into vertical and horizontal fin sections to handle different humidity representation methods. This segmentation, while increasing structural complexity, ensures measurement precision by preventing condensate accumulation on active fins during water-based operation and allowing proper ice formation during ice-based operation.
Solution Approach 2:
Different sections of the condensate cooler have different local qualities - vertical fins are optimized for ice-based representation with proper drainage characteristics, while horizontal fins are optimized for water-based representation with minimal pressure loss. Each section has the specific properties needed for its intended function, ensuring high measurement precision in both modes.
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 device provides stable and accurate humidity representation across a wide dewpoint range with reduced pressure losses and extended service life, enabling efficient operation for both water and ice-based humidity representation methods.
Implementation Method 1
Dry air or nitrogen at a pressure p1 is conducted here via a pressure regulator through a water bath in a saturation chamber (pre-saturating device) with the temperature ts. As a result, practically water vapor-saturated air at an approximate dewpoint temperature ̃ts at a pressure p1 is obtained.
Implementation Method 2
Subsequently, the saturated air is conducted through a heated connecting line with a temperature tv1>ts into a condensate cooler. The condensate cooler is temperature-stabilized in a highly stable liquid bath and cools the inflowing air to the condenser temperature t1, wherein the entire amount of excess water appears as the condensate.
Implementation Method 3
The saturated air is removed from the condensate cooler through a heated connecting line with a temperature tv2>t1, is relaxed to the pressure p2 via a heated needle valve with the temperature tp>tv2
Data Source
AI summary
A device for creating a reference humidity that includes a saturation chamber and a condensate cooler in fluid communication with the saturation chamber and arranged downstream of the saturation chamber, wherein the condensate cooler is a fin-type condenser whose arrangement is such that substantially horizontal gas flow through the condensation cooler results. A measuring chamber connected with the condensate cooler, in which a desired reference humidity is definitely set by varying pressures and/or temperatures.