Climate control system for a vehicle
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Solution Overview
Problem
Existing climate control systems for rail vehicles face challenges with combustible coolants, as they pose fire and explosion risks, and current indirect evaporating systems suffer from energy inefficiencies and increased weight and space requirements.
Innovation Solution
A directly evaporating system is designed for a compact climate control unit, where the electrical switch box is isolated to prevent combustible coolant ingress, and an overpressure is maintained using air from outside the coolant-carrying segments, ensuring no ignitable mixture accumulates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an indirect evaporating system is used with combustible coolants, then fire and explosion risks are reduced, but energy efficiency deteriorates and weight and space requirements increase
Solution Approach 1:
The climate control system is divided into a coolant-carrying segment and a non-coolant-carrying segment (housing/electrical components). This segmentation allows the combustible coolant to be confined to specific areas while keeping electrical components in safe zones, enabling direct evaporating systems to use combustible coolants without compromising safety.
Solution Approach 2:
Non-flammable transition pieces (ducts, connections) are introduced as intermediaries between the coolant-carrying segment and the housing. These intermediaries prevent the propagation of flames and combustible coolant vapor to electrical components, allowing direct evaporating systems to maintain safety while improving energy efficiency.
2Reliability
If an indirect evaporating system is used with combustible coolants, then fire and explosion risks are reduced, but device complexity and installation space increase
Solution Approach 1:
The system is segmented into coolant-carrying and non-coolant-carrying areas with clear spatial separation. This segmentation simplifies the overall system design by defining safe zones and coolant zones, reducing the complexity of safety systems compared to indirect evaporating arrangements.
Solution Approach 2:
The housing serves dual purposes: it provides structural support and simultaneously acts as a fire barrier separating coolant and electrical components. This merging of functions reduces system complexity by eliminating the need for separate protective enclosures.
3Use of energy by moving object
If combustible coolants are used in direct evaporating systems, then energy efficiency improves, but fire and explosion risks increase
Solution Approach 1:
Different areas of the system are assigned different quality characteristics: the coolant-carrying segment allows combustible coolant for efficiency, while the housing and electrical segments are designed as fire-resistant zones. This local differentiation enables direct evaporating systems to use combustible coolants efficiently while containing fire risks to specific areas.
Solution Approach 2:
Non-flammable transition pieces serve as intermediaries that connect the efficient direct evaporating coolant system with the safety-critical electrical components. These intermediaries allow the system to benefit from direct evaporating efficiency while preventing fire propagation to electrical areas.
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 design enhances fire and explosion protection for the electrical switch box, preventing combustible coolant inflow and improving safety, while also reducing energy inefficiencies and physical burdens associated with indirect systems.
Implementation Method 1
an overpressure can be created in an electrical box which is sufficiently closed for this purpose, to prevent an accumulation of combustible coolant
Implementation Method 2
combustible hydrocarbons such as propane (R290), propylene (R1270), or isobutane (R600a) are of interest as alternative coolants. These coolants are widely used in direct expansion systems
Data Source
AI summary
A climate control system for a vehicle for combustible coolants and is a device for installation on a vehicle roof. A directly evaporating system includes an electrical switch box inside a climate control device for the vehicle and is partitioned so that, in the event of relevant leakages of assemblies containing coolant, the assembly cannot come into contact with the combustible coolant and no ignitable mixture can occur in these areas. The electrical box is a closed assembly and is operatively connected to an assembly by which air from areas outside the segments containing coolant is guided into the electrical box.