Cooling System Pump Activation for Low-Temperature Compressor Idling
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Solution Overview
Problem
Existing cooling systems face challenges in efficiently operating with low-GWP refrigerants, particularly in low ambient temperatures, leading to issues such as difficulty in compressor switching and increased risk of dehumidification and freezing.
Innovation Solution
A cooling system that activates a refrigerant pump instead of the compressor when outdoor temperatures are below a threshold, using low-GWP refrigerants like R513A, R515B, R1234ze, and R471A, and switches to normal operation based on temperature and cooling requests, reducing compressor usage and enhancing evaporating temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compressor is used to circulate refrigerant in low ambient temperatures, then the cooling system can operate, but the compressor has difficulty switching on and the risk of dehumidification and freezing increases
Solution Approach 1:
A refrigerant pump is introduced as an intermediary device to circulate refrigerant liquid during low ambient temperature operation, replacing the compressor's circulation function. The pump is activated when outdoor temperature is at or below a threshold (e.g., 32°F), preventing compressor switching issues and reducing the risk of dehumidification and freezing by controlling refrigerant flow more reliably in cold conditions.
2Object-generated harmful factors
If low-GWP refrigerants are used to meet emissions standards, then environmental compliance is improved, but the refrigerants pose problems for existing cooling systems
Solution Approach 1:
The system dynamically switches between compressor-based operation and pump-based operation based on outdoor temperature conditions. When temperature is at or below the threshold, the pump activates to circulate refrigerant; when above the threshold, the compressor operates normally. This dynamic adaptation allows the system to effectively use low-GWP refrigerants while maintaining compatibility with existing cooling system infrastructure.
3Productivity
If the compressor is activated in low temperatures, then cooling can be provided, but the system efficiency decreases due to operational difficulties
Solution Approach 1:
The mechanical compression and circulation system is partially replaced with a pump-based liquid circulation system during low temperature operation. The refrigerant pump requires less energy to circulate refrigerant liquid compared to the compressor operating in cold conditions, thereby improving system efficiency while still providing the necessary cooling 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
The system reduces the risk of dehumidification and freezing, meets industry emissions standards, and improves efficiency, thereby reducing carbon footprint and indirect emissions.
Implementation Method 1
a condenser coupled to the CRAC unit, where the condenser is configured to cool the provided refrigerant liquid
Implementation Method 2
a refrigerant pump coupled to the CRAC unit, where the refrigerant pump refrigerant is configured to provide a refrigerant liquid to the CRAC unit
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A method for activating a pump operation circuit of a cooling system may include receiving outdoor temperature data from an outdoor temperature sensor and receiving a predetermined outdoor temperature threshold. The method may include determining whether the received outdoor temperature data exceeds the received predetermined outdoor temperature threshold by comparing the received outdoor temperature data to the received predetermined outdoor temperature threshold. Upon determining the received outdoor temperature does not exceed the received predetermined outdoor temperature threshold, the method may include generating one or more control signals configured to cause a compressor of a computer room air conditioning unit to be idled and generating one or more control signals configured to cause a pump to be activated.