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Pre-Heater For HVAC Fresh Air Intake

IP.com Disclosure Number: IPCOM000126214D
Publication Date: 2005-Jul-07
Document File: 5 page(s) / 88K

Publishing Venue

The IP.com Prior Art Database

Related People

Jeffrey P. Calfa: ATTORNEY [+3]

Abstract

Snow packing into the cowl tray. The snow from the windshield is pushed down into the cowl tray by the wipers. The HVAC fresh air intake on our HPVs is located in the cowl tray on the passenger side of the vehicle. This is below the passenger wiper blade. The wiper blade pushes the snow into the cowl tray and as it fills, it continues to pack snow until, in some instances, the HVAC fresh air intake is completely blocked. Once the snow has no where else to go, it will continue to pack up the windshield, which can reduce the performance of the wiper system. No resolution has yet been successful. The (snow plow) drivers must stop and remove the packed frozen snow from the cowl tray and HVAC air intake manually. Some customers have added restrictive filters to prevent the snow from entering the HVAC intake. However, this restricts air into the HVAC system and does not resolve the root problem of the snow packing in the cowl tray. It also does not address the reduced performance of the wiper system caused by the snow packing. By adding a pre-heater to the HVAC fresh air intake, or by heating the entire (or portions of) cowl tray, the snow will be melted so that it will not accumulate. It may also, by pre-heating the fresh air, improve cab/defroster performance. A small module would be added to the heating system, located at the fresh air intake in the cowl tray. Or, in the case of heating the cowl tray, a heat exchanger will be incorporated into the cowl tray or portions of the cowl tray. At this time, this is concepted to be a field fix for a specific issue with snow plow applications. A small heat exchanger would be added under the HVAC air intake grille or inserted into the cowl tray area. The required modifications would be, to plumb the hoses into the existing HVAC heater hoses. The cowl tray is a plastic part, which could be easily modified in the field, adding holes for the plumbing as necessary. By melting the snow as it is pushed into the cowl tray by the wipers, the invention would prevent snow packing in the cowl tray. (Currently, under certain conditions this snow pack restricts fresh air intake into the HVAC system and/or diminishing the performance of the wiper system.) Pre-heating the air entering the heater core may also be able to improve performance of the heating and defrosting system.

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DESCRIPTION OF THE INVENTION

1    What is the problem or issue (if any) that your invention is meant to solve?

Snow packing into the cowl tray. The snow from the windshield is pushed down into the cowl tray by the wipers. The HVAC fresh air intake on our HPVs is located in the cowl tray on the passenger side of the vehicle. This is below the passenger wiper blade. The wiper blade pushes the snow into the cowl tray and as it fills, it continues to pack snow until, in some instances, the HVAC fresh air intake is completely blocked. Once the snow has no where else to go, it will continue to pack up the windshield, which can reduce the performance of the wiper system

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2    How was the problem or issue handled (addressed/solved) before your invention?  Attach sketches, drawings, photos, and/or reports where possible.

No resolution has yet been successful. The (snow plow) drivers must stop and remove the packed frozen snow from the cowl tray and HVAC air intake manually.  Some customers have added restrictive filters to prevent the snow from entering the HVAC intake. However, this restricts air into the HVAC system and does not resolve the root problem of the snow packing in the cowl tray. It also does not address the reduced performance of the wiper system caused by the snow packing.

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3    How does your invention solve the problem or issue?  Attach sketches, drawings, photos, and/or reports where possible.

By adding a pre-heater to the HVAC fresh air intake, or by heating the entire (or portions of) cowl tray, the snow will be melted so that it will not accumulate. It may also, by pre-heating the fresh air, improve cab/defroster performance.

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4    How does the invention tie in with an existing process or in a vehicle or in an engine?  Attach sketches where applicable.

This would be plumbed into the existing heater piping, merely using engine hot water.

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5    What are the main components of the invention or what are the main steps of the process that are new or different?  Attach sketches, drawings, photos, and/or reports where possible.

A small module would be added to the heating system, located at the fresh air intake in the cowl tray. Or, in the case of heating the cowl tray, a heat exchanger will be incorporated into the cowl tray or portions of the cowl tray.

[Continue typing on electronic version of form or attach additional sheets for paper form]

6    Describe the novel features, operations, and functions of the invention and identify the best way of implementing your invention.  Describe all the components or steps involved.

At this time, this is concepted to be...