Modular Rooftop Bus Air Conditioner with Central Condenser
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Solution Overview
Problem
Current bus air conditioning systems are inflexible, heavy, and difficult to adapt to different bus models, requiring a solution that is more adaptable and lightweight to reduce fuel consumption and emissions.
Innovation Solution
A modular rooftop air conditioning unit with a metal frame, a central condenser section, and distributed HVAC modules made of plastic, allowing for customizable configurations and the use of lighter components from the motor industry, enabling easier transportation and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If air conditioning systems are designed integrally with the bus roof for each specific model, then the system is optimized for that specific bus model, but it becomes difficult to adapt to other bus models with different characteristics
Solution Approach 1:
The air conditioning system is divided into separate modular components including a condenser unit, evaporator unit, and control unit that can be independently configured and installed on different bus models, eliminating the need for complete system redesign for each model
Solution Approach 2:
The modular components are designed with standardized interfaces and mounting mechanisms that allow them to serve multiple bus models universally, while still providing optimized performance for each specific application through selective configuration
2Weight of moving object
If traditional air conditioning systems are used, then the system provides adequate cooling performance, but the system becomes relatively heavy making transportation and installation difficult
Solution Approach 1:
The system is segmented into separate modular units that can be transported independently, reducing the weight burden on any single transportation operation and allowing for staged installation on the bus roof
Solution Approach 2:
The system utilizes lightweight materials and optimized component designs that reduce overall weight while maintaining cooling performance, including the use of compact compressors and efficient heat exchangers with reduced mass
3Loss of energy
If heavy air conditioning systems are installed on buses, then the system provides sufficient cooling capacity, but fuel consumption and exhaust emissions increase
Solution Approach 1:
The system employs high-efficiency components with improved coefficient of performance (COP) ratios, including variable speed compressors and optimized heat exchanger geometries that reduce the energy required for cooling operation
Solution Approach 2:
The system incorporates electronic expansion valves and electronic control systems that replace traditional mechanical throttling mechanisms, improving energy efficiency by precisely controlling refrigerant flow and eliminating mechanical losses
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 solution reduces the overall weight of the system, enhances adaptability to performance requirements, and decreases fuel consumption and emissions by using lighter components, facilitating easier installation and transportation.
Implementation Method 1
a condenser with a fan associated therewith for drawing outside air through said condenser
Implementation Method 2
at least one evaporator and at least one heater for conditioning air inside a passenger compartment of a bus
Implementation Method 3
at least one blower, at least one evaporator and at least one heater for conditioning air
Data Source
AI summary
The present disclosure discloses a rooftop air conditioning unit for a bus or other vehicle. The air conditioning unit includes a frame, a condenser section mounted on the frame and a HVAC section mounted on the frame. The condenser section is positioned along a central longitudinal axis of the air conditioning unit, and the HVAC section is positioned in a distributed way on the two opposite sides of the condenser section and comprises at least one pair of HVAC modules, each of which includes a box-shaped base of plastic material mounted on the frame, inside which a respective blower, evaporator and heater are mounted.