Test Bypass for Cooling Apparatus Heat Load Simulation
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Solution Overview
Problem
Current methods for simulating combined isothermal and non-isothermal heat loads in cooling apparatuses require a large number of measurements, which are costly and prone to high tolerances, especially in cryogenic applications, leading to inaccurate results.
Innovation Solution
A method utilizing a test bypass with at least one regulating valve, a first heating means for isothermal load, and a second heating means for non-isothermal load, allowing the process medium to bypass the consuming device, where the process pressure is adjusted to maintain a constant liquid phase, enabling calculation of mass flow using measured state points and pressure values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of measurements are taken to simulate combined isothermal and non-isothermal heat loads, then the accuracy of heat load simulation can be improved, but the cost and measurement tolerance errors increase significantly
Solution Approach 1:
The patent extracts and separates the measurement requirements into essential and non-essential categories. By using a test bypass with regulated pressure and defined heating loads, it eliminates the need for multiple simultaneous measurements of temperature, pressure, and mass flow that were previously required. Only essential measurements (heating load and either temperature or pressure at one point) are retained, significantly reducing measurement complexity while maintaining simulation accuracy.
Solution Approach 2:
The patent changes the measurement parameters from multiple simultaneous measurements of temperature, pressure, and mass flow to a reduced set of parameters. By regulating pressure in the liquid vessel and defining heating loads, the system transforms the measurement requirements into measuring only heating load and one state parameter (temperature or pressure), thereby reducing measurement complexity while preserving simulation capability.
2Reliability
If multiple measurements are performed to determine state points and mass flow, then the completeness of process data can be improved, but the global tolerance of measurements increases leading to inaccurate results
Solution Approach 1:
The patent extracts only the essential measurements needed for accurate heat load simulation. Instead of measuring multiple parameters (temperature, pressure, mass flow) that accumulate tolerances, it reduces the measurement set to essential parameters only (heating load and one state parameter), thereby maintaining data completeness for simulation while minimizing tolerance accumulation.
Solution Approach 2:
The patent uses a test bypass that copies the essential thermal characteristics of the consuming device without requiring complete replication of all process parameters. By regulating pressure and defining heating loads in the bypass, it creates a simplified copy that preserves the critical heat load behavior while eliminating the need for multiple simultaneous measurements, thus reducing global tolerance.
3Adaptability or versatility
If heating means are used to simulate isothermal and non-isothermal loads in a test bypass, then the versatility of heat load simulation can be improved, but the requirement for process data measurements increases
Solution Approach 1:
The patent changes the measurement parameters by regulating pressure in the liquid vessel and defining heating loads. This transforms the requirement for multiple process data measurements into a requirement for measuring only heating load and one state parameter. The pressure regulation and defined heating loads simplify the parameter set needed for versatile heat load simulation, maintaining adaptability while reducing measurement quantity.
4Ease of operation
If a regulating valve is installed in the bypass to control mass flow or pressure, then the control capability of the test bypass can be improved, but the complexity of the measurement system increases
Solution Approach 1:
The patent changes the control approach by regulating pressure in the liquid vessel rather than controlling mass flow through multiple valves. This pressure regulation approach, combined with defined heating loads, simplifies the measurement system by eliminating the need for multiple simultaneous measurements of temperature, pressure, and mass flow. The control capability is maintained through pressure regulation while measurement complexity is reduced.
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 minimizes the number of required measurements and reduces global measurement tolerance, allowing for accurate simulation of heat loads with saturated vapor flow, thereby improving the precision and efficiency of heat load simulation.
Implementation Method 1
a first heating means (H1) for introducing an isothermal heating load (Q2-3) into the process medium (M)
Implementation Method 2
a second heating means (H2) for introducing a non-isothermal heating load (Q5-6) into the process medium (M)
Implementation Method 3
by means of the at least one regulating valve (CV1, CV2) a process pressure (p4) is established in the liquid vessel (G), into which the isothermal heating load (Q2-3) is introduced, so that in the vessel a constant level of a liquid phase of the process medium is maintained
Implementation Method 4
A cooling apparatus and method for cooling a cavity with the aid of a liquid bath
Implementation Method 5
Here the enthalpy of vaporization of the process medium is used to compensate for the heat input in the cavity
Data Source
Figure 1
AI summary
The invention relates to a method for simulation of an isothermal and non-isothermal heating load introduced by a consuming device (V) into a process medium (M) of a cooling apparatus (1), said simulation being by means of a test bypass (2); and the invention further relates to such a test bypass (2), and a cooling apparatus having such a test bypass.