Two-Row Vehicle Air Conditioning Heat Exchanger for Heating Homogeneity
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Solution Overview
Problem
Future diesel and petrol engines are unable to provide sufficient heat to warm vehicle compartments, necessitating additional heating measures, and existing air conditioning systems require more efficient and environmentally friendly solutions for both heating and cooling.
Innovation Solution
A two-row design for the additional heat exchanger condenser in the air conditioning system, where the first row handles desuperheating and condensation, and the second row handles subcooling, with a header pipe connecting them to ensure even temperature distribution and increased condensation temperature, allowing for efficient air heating and reduced compressor outlet temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single-row additional heat exchanger is used, then the device complexity is low, but the air temperature homogeneity and heating efficiency are insufficient
Solution Approach 1:
The additional heat exchanger is divided into two separate rows (first row for desuperheating and condensation, second row for subcooling) instead of using a single-row design. This segmentation allows each row to be optimized for its specific function, resulting in improved air temperature homogeneity across the vehicle interior while maintaining manageable structural complexity through modular construction.
2Power
If the condensation temperature is increased, then the heating capacity is improved, but the compressor outlet temperature requirements become more stringent
Solution Approach 1:
The heat exchanger is segmented into two rows with distinct functions: the first row handles desuperheating and condensation, while the second row performs subcooling. This segmentation enables the system to achieve higher condensation temperatures for improved heating capacity while the two-row configuration manages the temperature profile to accommodate compressor outlet temperature constraints.
Solution Approach 2:
The system changes the condensation temperature parameter by using the two-row heat exchanger configuration, which allows operation at higher condensation temperatures to improve heating capacity. The parameter change is achieved while maintaining compatibility with compressor outlet temperature requirements through the distributed heat transfer approach of the two-row design.
3Productivity
If a two-row heat exchanger design is used, then the heating efficiency and temperature homogeneity are improved, but the device complexity increases
Solution Approach 1:
The additional heat exchanger is segmented into two rows with specific functional divisions: the first row for desuperheating and condensation, and the second row for subcooling. This segmentation improves heating efficiency by optimizing heat transfer in each row while maintaining manageable complexity through modular design and clear functional separation.
Solution Approach 2:
The two-row heat exchanger design provides multi-functionality within a single component assembly. The first row performs desuperheating and condensation functions, while the second row handles subcooling, allowing the additional heat exchanger to fulfill multiple thermal management functions that improve overall heating efficiency while consolidating what could have been separate components.
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 ensures consistent air temperature across the vehicle, enhances heating capacity, and allows for the use of refrigerants with lower compressor outlet temperatures, providing effective and efficient heating even in extreme conditions.
Implementation Method 1
at least one desuperheating and, if necessary, condensation of the refrigerant supplied by the compressor takes place in the first heat exchanger row
Implementation Method 2
Desuperheating is the cooling of the refrigerant until it reaches the dew line of a Mollier diagram
Implementation Method 3
subcooling of the condensed refrigerant takes place in the second row of heat exchangers
Implementation Method 4
the heating heat exchanger and the additional heat exchanger connected in the coolant circuit are connected in series with one another in the flow direction of the incoming supply air
Data Source
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AI summary
The invention relates to a vehicle having an air conditioning system for heating inlet air (I) flowing into the vehicle interior (2), said system comprising a heater heat exchanger (8), which is thermally coupled via a coolant circuit (13) to a drive assembly or the like, and an additional heat exchanger (7) which is connected into a coolant circuit of the air conditioning system and in heating mode emits heat to the inlet air (I). According to the invention the additional heat exchanger (7) is at least of double-row design having a first heat exchanger row (30) and a second heat exchanger row (31), and in the air flow direction the two heat exchanger rows (30, 31) are configured so that in the first heat exchanger row (31) an undercooling of the condensed coolant takes place and in the second heat exchanger row (30) at least a removal of heat and optionally condensation of the coolant takes place.