Dual Heat Exchange Air Conditioning for Higher COP
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Solution Overview
Problem
Conventional air conditioning and heat pump systems have a relatively low Coefficient of Performance (COP), which limits their energy efficiency in heating and cooling operations.
Innovation Solution
The system incorporates a cooling tower and multiple heat exchangers to selectively use cooling water or air-cooled heat exchangers, allowing refrigerant to exchange heat with both water and ambient air, enhancing heat transfer efficiency and COP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional air conditioning and heat pump systems are used, then the system structure is simple, but the Coefficient of Performance (COP) is relatively low
Solution Approach 1:
The system divides the heat exchange process into multiple segments: air-to-refrigerant heat exchange in the first heat exchanger, water-to-refrigerant heat exchange in the second heat exchanger, and refrigerant storage in the storage tank. This segmentation allows independent optimization of each heat exchange path, improving overall COP while maintaining manageable system complexity
Solution Approach 2:
The refrigerant serves multiple functions: it acts as the heat transfer medium in both heat exchangers, the working fluid in the compressor, and the stored resource in the refrigerant storage tank. This multi-functionality improves energy efficiency by maximizing the utilization of refrigerant throughout the system cycle
2Use of energy by moving object
If a cooling tower and multiple heat exchangers are added, then heat transfer efficiency and COP improve, but device complexity increases
Solution Approach 1:
The refrigerant acts as an intermediary substance that mediates heat transfer between the ambient air (first heat exchanger) and the cooling water (second heat exchanger). This intermediary approach allows efficient thermal coupling between two heat exchange paths without requiring direct contact between air and water streams
Solution Approach 2:
The system nests the refrigerant circulation cycle within the broader heat exchange system, where the refrigerant cycle is contained within and coordinated with the operation of multiple heat exchangers and the cooling tower, creating a compact integrated structure
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 configuration significantly improves energy efficiency by allowing more heat to be produced for a given work input, reducing energy consumption, and enabling operation in both comprehensive air conditioning and heat pump modes.
Implementation Method 1
a cooling heat exchanger provided in the tower casing and connected to the second heat exchanger, the first heat exchanger, and the refrigerant storage tank through at least one of the connecting pipes, the water distributor being arranged to spray the cooling water on the cooling heat exchanger so that refrigerant passing through the cooling heat exchanger is allowed to perform heat exchange with the cooling water
Implementation Method 2
the refrigerant leaving the cooling heat exchanger being guided to flow through the first heat exchanger for absorbing heat from the heat distribution system
Implementation Method 3
the refrigerant leaving the compressor and guided to enter the second heat exchanger for releasing heat thereto
Implementation Method 4
a compressor having a compressor outlet and a compressor inlet
Data Source
AI summary
A central air conditioning and heat pump system includes a main heat exchange system and a cooling arrangement. The main heat exchange system includes a compressor, a first heat exchanger, a second heat exchanger. The cooling arrangement includes a cooling tower and a cooling heat exchanger. When the central air conditioning and heat pump system is selectively operated in a comprehensive air conditioning mode, refrigerant may be cooled both by water and ambient air in the cooling arrangement and the second heat exchanger respectively.