Windshield PETD Heating for Rapid Vehicle Defrosting
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Solution Overview
Problem
Traditional vehicle HVAC systems require a significant amount of time and energy to defrost, deice, and defog windshields, consuming up to 20-30 minutes and 5.2 kWh of energy.
Innovation Solution
An HVAC system with a transparent metallic layer on the windshield that applies voltage to heat the glass using a pulse-electro thermal deicing (PETD) heater system, reducing defrosting time to under a minute and energy consumption to 0.12 kWh.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional hot air from HVAC system is used to defrost windshield, then defrosting function is achieved, but defrosting time is long (20-30 minutes) and energy consumption is high (5.2 kWh)
Solution Approach 1:
The patent replaces the mechanical HVAC air blowing system with an electrical heating system. A transparent heating element is integrated into the windshield structure, and when voltage is applied, it directly generates heat through Joule heating to melt ice and fog, eliminating the need for complex HVAC air circulation mechanisms and achieving rapid defrosting with minimal energy consumption.
Solution Approach 2:
The patent changes the physical state and properties of the heating method. Instead of using hot air flow (thermal convection), it uses direct electrical heating (Joule heating) by applying voltage to the transparent heating element. This parameter change from thermal convection to electrical resistance heating enables instantaneous heat generation and rapid defrosting.
2Productivity
If transparent metallic layer with PETD heater is applied to windshield, then defrosting speed increases to under a minute with 0.12 kWh energy consumption, but system complexity increases
Solution Approach 1:
The patent merges the heating function directly into the windshield structure by integrating a transparent metallic heating layer during windshield manufacturing. This integration eliminates the need for separate HVAC defrosting mechanisms, reducing overall system complexity while achieving rapid defrosting. The heating element becomes an inherent part of the windshield rather than an add-on component.
Solution Approach 2:
The transparent metallic layer serves multiple functions: it acts as both a structural component of the windshield and a heating element for defrosting. This multi-functionality reduces the need for separate dedicated defrosting systems, thereby simplifying the overall vehicle system while maintaining high defrosting productivity.
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 PETD heater system significantly reduces defrosting time and energy consumption, providing faster and more energy-efficient windshield defrosting, deicing, and defogging compared to traditional methods.
Implementation Method 1
a control module configured to apply voltage from a power supply to the transparent metallic layer to heat the windshield
Data Source
AI summary
An HVAC system for a vehicle including: a transparent metallic layer configured to be mounted to a windshield; a control module configured to apply voltage from a power supply to the transparent metallic layer to heat the windshield; and an HVAC case defining a face outlet and a combined foot and side window outlet, the HVAC case including a mode door movable to control airflow through both the face outlet and the combined foot and side window outlet.