Cold water supply system
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Solution Overview
Problem
The existing free cooling systems face challenges in independent load control of refrigerant and free cooling circuits, particularly when operated simultaneously, due to shared air-sending fans and integral arrangement of air heat exchangers.
Innovation Solution
A cold water supply system with independent refrigerant and free cooling circuits, each comprising compressors, water heat exchangers, and a controller that adjusts operating frequencies based on water temperature to manage the circuits' operations independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If air heat exchangers for refrigerant circuit and free cooling circuit are integrally arranged side by side, then space utilization is improved, but independent load control capability deteriorates
Solution Approach 1:
The patent divides the air handling system into separate air-sending fans for the refrigerant circuit and free cooling circuit, even though the air heat exchangers are integrally arranged. This segmentation of the air supply control allows independent operation of each circuit while maintaining compact spatial arrangement of the heat exchangers.
2Device complexity
If air-sending fan is shared by refrigerant circuit and free cooling circuit, then device complexity is reduced, but control precision deteriorates when both circuits operate simultaneously
Solution Approach 1:
The patent implements separate air-sending fans for the refrigerant circuit and free cooling circuit, eliminating the shared fan configuration. This segmentation enables precise independent control of air supply to each circuit, allowing both circuits to operate simultaneously with appropriate control according to their respective operation states.
3Ease of operation
If air-sending fan is shared by both circuits, then ease of operation is improved, but ability to control circuits according to respective operation states deteriorates
Solution Approach 1:
The patent provides separate air-sending fans for the refrigerant circuit and free cooling circuit, enabling each circuit to be controlled independently according to its specific operation state. The controller can adjust the operation of each fan based on the respective cooling demands and operational requirements of each circuit.
Solution Approach 2:
The patent implements dynamic control where the controller adjusts the operation of air-sending fans based on real-time operation states of both circuits. This dynamic adaptability allows the system to respond to changing cooling demands and operational conditions of each circuit independently.
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 precise control of refrigerant and free cooling circuits even when operated simultaneously, optimizing energy efficiency and performance.
Implementation Method 1
a first water heat exchanger configured to exchange heat between refrigerant and water flowing through the water pipe to cool the water
Implementation Method 2
a second water heat exchanger configured to exchange heat between a heat medium and the water to cool the water
Implementation Method 3
a third water heat exchanger configured to exchange heat between refrigerant and the water to cool the water
Data Source
AI summary
A cold water supply system cools water flowing through a water pipe, and supplies the water cooled to a cooling load, the cold water supply system including: an independent refrigerant circuit unit including a first compressor and a first water heat exchanger configured to exchange heat between refrigerant and the water to cool the water; a composite unit configured to cool the water, and a controller configured to control operation of the independent refrigerant circuit unit and operation of the composite unit, wherein the composite unit includes a free cooling unit including a pump and a second water heat exchanger configured to exchange heat between a heat medium and the water to cool the water, and a coupled refrigerant circuit unit including a second compressor and a third water heat exchanger configured to exchange heat between refrigerant and the water to cool the water, and the controller controls an operating frequency of the first compressor, an operating frequency of the second compressor, and an operating frequency of the pump based on a temperature of the water flowing out from the water pipe.