Cooling system with vertical alignment
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Solution Overview
Problem
Cooling systems installed in tall buildings face oil return issues due to vertical separation between the compressor and the high side heat exchanger, leading to increased energy consumption, size, and cost when conventional water cooling systems are used to bypass the high side heat exchanger.
Innovation Solution
The implementation of P-traps in vertical piping to capture and push oil upwards to the high side heat exchanger, eliminating the need for separate water cooling systems by using piping of varying sizes based on compressor discharge pressure to direct refrigerant and oil effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate water cooling system is used to bypass the high side heat exchanger, then oil return issues are avoided, but energy consumption increases
Solution Approach 1:
P-traps are introduced as intermediary devices in the refrigerant piping system. These P-traps capture oil from the refrigerant flow and use the refrigerant pressure to push the oil upward to the high side heat exchanger, serving as a mediator that enables oil return without requiring a separate water cooling system
Solution Approach 2:
The refrigerant itself is used to service the oil return function. The refrigerant flow through the P-traps automatically captures and transports oil to the high side heat exchanger, eliminating the need for external water cooling systems and reducing overall energy consumption
2Reliability
If a separate water cooling system is used to bypass the high side heat exchanger, then oil return issues are avoided, but system size increases
Solution Approach 1:
The oil return function is merged into the existing refrigerant piping system through the integration of P-traps. Instead of adding a separate water cooling system, the P-traps are incorporated into the refrigerant flow path, allowing oil capture and transport to occur within the same system infrastructure that handles refrigerant circulation
3Reliability
If a separate water cooling system is used to bypass the high side heat exchanger, then oil return issues are avoided, but system cost increases
Solution Approach 1:
P-traps represent a simple, inexpensive component solution compared to complex water cooling systems. These relatively simple devices can be manufactured and installed at lower cost, providing effective oil return functionality without the high capital investment required for separate cooling system infrastructure
4Device complexity
If vertical piping is used to direct refrigerant from compressor to high side heat exchanger, then oil flows back to compressor, but system configuration is simplified
Solution Approach 1:
The vertical piping system is segmented by introducing P-traps at specific locations. These P-traps divide the continuous refrigerant flow into sections, allowing oil to be captured and redirected upward at each segment, preventing oil from flowing back to the compressor while maintaining the simplified vertical configuration
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
Prevents oil from flowing back to the compressor, reducing energy consumption, system size, and cost by efficiently managing oil flow without the need for additional water cooling systems.
Implementation Method 1
As oil collects in the P-traps, the refrigerant begins to push the oil upwards until the oil reaches the high side heat exchanger
Implementation Method 2
the oil that mixed with the refrigerant discharged by the compressor may not be able to overcome the vertical separation and, as a result, the oil may flow backwards to the compressor
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A cooling system (200A) uses P-traps to address the oil return issues that result from a vertical separation between the compressor (112) and the high side heat exchanger (102). Generally, the vertical piping that carries the refrigerant from the compressor to the high side heat exchanger includes P-traps (204A-F) installed at various heights to capture oil in the refrigerant and to prevent that oil from flowing back to the compressor (112). As oil collects in the P-traps, the refrigerant begins to push the oil upwards until the oil reaches the high side heat exchanger (102). Multiple piping (202A, 202B) of different sizes may be used depending on a discharge pressure of the compressor. When the discharge pressure is higher, a larger piping may be used direct the oil and refrigerant to the high side heat exchanger.