Multi-Zone HVAC System for Cargo Vehicle Temperature Uniformity
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Solution Overview
Problem
Conventional HVAC systems for cargo vehicles fail to maintain consistent temperature and humidity levels across different compartments, leading to variability in the quality of perishable goods during transportation, especially in autonomous vehicles where battery considerations add complexity.
Innovation Solution
An HVAC system for cargo vehicles that includes evaporators, condensers, and controllers to manage airflow and temperature across freezing, refrigerating, and warming rooms, with bypass valves and relief valves to adjust airflow based on external temperature and load conditions, ensuring independent temperature control for each compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling device is used for the entire delivery unit, then the device complexity is reduced, but the temperature uniformity across different positions becomes inconsistent
Solution Approach 1:
The delivery unit is divided into multiple independent temperature-controlled zones (freezing room, refrigerating room, warming room), each with its own cooling device. This segmentation allows each zone to maintain its required temperature independently, solving the temperature uniformity problem while accepting increased system complexity.
2Manufacturing precision
If multiple independent temperature-controlled rooms are implemented, then the temperature control precision for each compartment is improved, but the device complexity increases
Solution Approach 1:
The HVAC system is segmented into multiple independent temperature-controlled rooms (freezing, refrigerating, warming), each with dedicated cooling devices and control systems. This allows precise temperature control for each compartment while managing complexity through modular design.
Solution Approach 2:
Each room is equipped with cooling devices and control systems tailored to its specific temperature requirements. The freezing room has devices optimized for sub-zero temperatures, the refrigerating room for moderate cooling, and the warming room for heating, ensuring local optimization for each zone's quality needs.
3Power
If the evaporator operates at high load to meet cooling demands, then the cooling capacity is sufficient, but the evaporator overload state reduces system efficiency
Solution Approach 1:
Instead of operating one evaporator at excessive load, the system uses multiple evaporators that can operate at partial loads. Each evaporator serves specific rooms and can be independently controlled, allowing them to operate within efficient load ranges while collectively providing sufficient cooling capacity for all zones.
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 effectively maintains consistent temperatures across compartments, enhancing the preservation of perishable goods by optimizing airflow and load management, thus improving the quality and safety of transported goods.
Implementation Method 1
an evaporator configured to allow air introduced from a first internal air and external air door to flow through the evaporator
Implementation Method 2
a condenser configured to allow air introduced from a second internal air and external air door to flow through the condenser
Data Source
AI summary
A heating, ventilation, and air conditioning (HVAC) system for a cargo vehicle includes an evaporator, a first door, a condenser, a second door, a freezing room, a refrigerating room, a warming room, and a controller, wherein the controller is configured to control an amount of opening of each of the first internal air and external air door, the second internal air and external air door, the first door, and the second door and an amount of driving of each of the evaporator and the condenser in response to an outside air condition of a vehicle, controlling temperature of each of the freezing room, the refrigerating room, and the warming room.