Parallel Condenser ORC System for Cavitation-Free Heat Regulation
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Solution Overview
Problem
Existing ORC systems face challenges in efficiently regulating heat distribution and managing different pressure levels in dual condenser setups, leading to increased complexity and potential cavitation issues, especially when switching between air-cooling and liquid-cooling modes.
Innovation Solution
A device and method utilizing at least two condensers connected in parallel, with a liquid-cooled and an air-cooled condenser, along with a siphon, container, and back-pressure valves, to ensure flexible heat distribution and prevent cavitation, allowing for adjustable fan and pump speeds to manage heat emission and subcooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical valves are used to regulate mass flows in dual condenser setups, then heat distribution can be controlled, but system complexity and error rate increase due to different pressure levels causing return flow
Solution Approach 1:
The condensers are designed to automatically self-regulate mass flow distribution based on pressure differences without requiring external mechanical valves. The system uses the inherent pressure gradients and flow dynamics to direct working medium to the appropriate condenser, eliminating the need for complex valve control mechanisms and reducing system complexity while maintaining adaptability.
Solution Approach 2:
The patent replaces mechanical valve systems with a pressure-based flow regulation mechanism. By utilizing pressure differences between condensers and the expansion machine, the system automatically directs mass flow without mechanical intervention, substituting a simple pressure-driven mechanism for complex mechanical valve control.
2Reliability
If condensed working medium is subcooled to avoid cavitation in the feed pump, then cavitation is prevented, but the NPSH value requirement increases the complexity of temperature control
Solution Approach 1:
The patent maintains the liquid phase of working medium throughout the condenser system by ensuring pressure and temperature conditions remain above the saturation curve. By keeping the condensed medium in a liquid state through proper pressure management, the system achieves cavitation-free operation while simplifying temperature control, as no phase change management is required in the pump suction line.
Solution Approach 2:
The system performs preliminary subcooling of the working medium in the condenser before it reaches the feed pump. By ensuring the medium is already subcooled and in liquid form before pump intake, the system prevents cavitation at the source rather than requiring complex active control during pump operation.
3Adaptability or versatility
If two condensers are interconnected to allow both air-cooling and liquid-cooling modes, then operational flexibility is improved, but regulating mass flow distribution between condensers becomes difficult
Solution Approach 1:
The dual condenser system automatically self-regulates mass flow distribution based on real-time pressure differences between the condensers. When one condenser operates in air-cooling mode (higher pressure), the working medium naturally flows to the liquid-cooled condenser (lower pressure), and vice versa, eliminating the need for manual flow regulation while maintaining operational flexibility.
Solution Approach 2:
The system uses inherent pressure feedback between the two condensers to automatically balance mass flow distribution. The pressure difference created by different cooling modes serves as a natural feedback signal that directs flow to the appropriate condenser, creating a self-balancing system that is easy to operate while maintaining versatility.
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
Enables flexible heat regulation and efficient operation by preventing cavitation and maintaining a sufficient positive suction head, reducing system complexity and error rates, while allowing for seamless switching between cooling modes.
Implementation Method 1
Each condenser can be connected to the feed pump via a siphon, wherein a minimum filling height of the condensed working medium is determined in the condenser by the vertex of the siphon
Implementation Method 2
at least two condensers connected in parallel between the expansion machine and the feed pump for deheating, condensing and optionally additionally subcooling the expanded working medium
Implementation Method 3
The condensed working medium returns from the condenser to the feed pump, whereby the thermodynamic cycle is closed
Data Source
AI summary
The invention relates to a device for operating a thermodynamic cycle, in particular an ORC process, comprising: a feed pump for conveying liquid working medium to an evaporator by increasing the pressure; the evaporator for evaporating and optionally additionally superheating the working medium by supplying heat; an expansion machine for producing mechanical energy by expanding the evaporated working medium; and at least two condensers connected in parallel between the expansion machine and the feed pump for condensing and optionally subcooling the expanded working medium. The invention further relates to a corresponding method for operating a thermodynamic cycle.