Condenser Fan and Flow Control for Stable Head Pressure
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Solution Overview
Problem
Prior art condenser units in vapor-compression refrigeration systems face efficiency issues due to fluctuations in ambient temperature, leading to unstable head pressure, which can cause system malfunction and require excessive refrigerant usage, increasing energy consumption and environmental impact.
Innovation Solution
A condenser unit with a controller that adjusts the flow control and fan speed based on preselected parameters, such as head pressure, ambient temperature, or refrigerant temperature, to maintain head pressure within a predetermined range, using a flow control means and a fan control circuit to optimize refrigerant flow and air dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a flooding valve is used to control head pressure by causing liquid refrigerant to back up into the condenser, then head pressure increases, but device complexity increases and refrigerant usage increases
Solution Approach 1:
The patent removes the flooding valve from the system entirely. Instead of using a flooding valve to control head pressure, the system uses a flow control means positioned in the refrigerant line between the compressor and condenser to control the flow of superheated refrigerant vapor into the condenser, thereby maintaining head pressure without the complexity and refrigerant consumption associated with flooding valves
Solution Approach 2:
The patent introduces a flow control means as an intermediary device to regulate refrigerant flow into the condenser. This flow control means acts as a mediator between the compressor and condenser, controlling head pressure through flow regulation rather than through the flooding mechanism, thus avoiding the need for liquid refrigerant backup into the condenser
2Reliability
If a flooding valve is used to maintain head pressure, then system reliability improves under low ambient temperature, but quantity of refrigerant increases
Solution Approach 1:
The patent eliminates the flooding valve mechanism that requires significant liquid refrigerant charge. By using a flow control means to regulate superheated refrigerant vapor flow into the condenser, the system maintains reliability across ambient temperature ranges without requiring the excessive refrigerant quantities needed for flooding valve operation
Solution Approach 2:
The patent changes the operating parameter from liquid refrigerant flooding to superheated refrigerant vapor flow control. The flow control means regulates the flow of superheated refrigerant vapor into the condenser, maintaining head pressure through vapor flow regulation rather than liquid refrigerant accumulation, thereby reducing overall refrigerant requirements while maintaining system reliability
3Stress or pressure
If compressor operates at artificially high level due to flooding valve, then head pressure is maintained, but energy consumption increases
Solution Approach 1:
The patent implements a control system with a controller that receives input from a head pressure sensor and adjusts the flow control means accordingly. This feedback mechanism allows the system to maintain head pressure within a desired range by dynamically adjusting refrigerant flow, preventing the compressor from operating at artificially high levels and reducing energy consumption compared to flooding valve systems
Solution Approach 2:
The patent introduces dynamic control through the flow control means and control system. Rather than the static flooding valve that forces constant high compressor operation, the flow control means dynamically adjusts refrigerant flow based on actual system conditions, allowing the compressor to operate efficiently across varying ambient temperatures and reducing overall energy consumption
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 maintains efficient operation across a wider range of ambient temperatures, reduces refrigerant usage, and decreases energy consumption, while ensuring proper system function and minimizing environmental impact.
Implementation Method 1
a condenser fan, for moving air past the condenser, to dissipate heat from the condenser
Implementation Method 2
a condenser for receiving the superheated refrigerant vapor and condensing the superheated refrigerant vapor therein to a liquid refrigerant to release heat therefrom upon the condensation thereof
Data Source
AI summary
A condenser unit including a compressor for compressing a refrigerant vapor to provide a superheated refrigerant vapor exerting a head pressure, and a condenser for receiving the superheated refrigerant vapor and condensing the superheated refrigerant vapor therein, the condenser being located in an uncontrolled space with air therein at an ambient temperature. The condenser unit also includes a flow control means for controlling flow of the superheated refrigerant vapor from the compressor into the condenser, a rotatable condenser fan for moving air past the condenser to dissipate heat from the condenser, and a controller for controlling the flow control means and the speed of rotation of the condenser fan based on at least one preselected parameter, to maintain the head pressure within a predetermined range thereof.