Compressor Bypass Cooling System for Low-Ambient-Temperature Operation
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Solution Overview
Problem
Conventional cooling systems face inefficiencies when ambient temperatures are low, leading to reduced refrigerant pressure, which causes compressors to cycle on and off frequently, wasting energy and reducing effectiveness.
Innovation Solution
The cooling system incorporates a bypass line and valve that opens when ambient temperatures or refrigerant pressure is low, allowing refrigerant to bypass compressors, and uses a pump or thermosiphon to maintain pressure, thereby shutting off compressors and reducing energy waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the high side heat exchanger speed is reduced or turned off to remedy low refrigerant pressure, then refrigerant pressure is improved, but cooling efficiency deteriorates
Solution Approach 1:
The system segments the refrigerant circulation path into two separate paths: a compressor path for normal operation and a bypass path for low temperature conditions. The bypass line with valve couples the discharge of the high side heat exchanger directly to the flash tank, allowing independent control of each path based on ambient conditions
Solution Approach 2:
The bypass valve acts as an intermediary that directs refrigerant flow between the compressor and the bypass line based on temperature and pressure conditions. The pump serves as an intermediary device to maintain refrigerant circulation and pressure when compressors are shut off during low temperature operation
2Stress or pressure
If the compressor cycles on and off frequently when ambient temperatures are low, then refrigerant pressure is maintained, but energy consumption increases
Solution Approach 1:
The bypass system enables continuous refrigerant circulation through the bypass line when compressors are shut off, eliminating the on/off cycling behavior. The pump maintains continuous operation to circulate refrigerant through the bypass path, ensuring steady pressure without repeated compressor startup and shutdown
Solution Approach 2:
The invention extracts the compression function from the refrigerant circulation system during low temperature conditions by shutting off compressors and replacing it with the bypass path and pump, separating the pressure maintenance function from the compression function
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 allows for the efficient operation of cooling systems at low temperatures by bypassing compressors and maintaining necessary pressure, reducing energy waste and ensuring effective refrigerant cycling, even in extremely cold conditions.
Implementation Method 1
When ambient temperatures are extremely low, thermosiphon may be used to cycle the refrigerant rather than a pump
Data Source
AI summary
A cooling system is designed to generally allow for one or more compressors to be bypassed when ambient temperatures are low. The system includes a bypass line and valve that opens when ambient temperatures are low and/or when the pressure of the refrigerant in the system is low. In this manner, the refrigerant can flow through the bypass line instead of through one or more compressors. These compressors may then be shut off. To supply any needed pressure to cycle the refrigerant, the system may include a pump that turns on when the bypass line is open. When ambient temperatures are extremely low, thermosiphon may be used to cycle the refrigerant.