AU2010100608A4 - Ductwork - Google Patents
Ductwork Download PDFInfo
- Publication number
- AU2010100608A4 AU2010100608A4 AU2010100608A AU2010100608A AU2010100608A4 AU 2010100608 A4 AU2010100608 A4 AU 2010100608A4 AU 2010100608 A AU2010100608 A AU 2010100608A AU 2010100608 A AU2010100608 A AU 2010100608A AU 2010100608 A4 AU2010100608 A4 AU 2010100608A4
- Authority
- AU
- Australia
- Prior art keywords
- layer
- ductwork
- fluid impervious
- surrounding
- polyester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000012530 fluid Substances 0.000 claims description 24
- 229920000728 polyester Polymers 0.000 claims description 21
- 229920002799 BoPET Polymers 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 18
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 15
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 7
- 238000004378 air conditioning Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0263—Insulation for air ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0281—Multilayer duct
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION INNOVATION PATENT DUCTWORK The following statement is a full description of this invention including the best method of performing it known to me: DUCTWORK TECHNICAL FIELD 5 The present invention relates to ductwork for a Heating, Ventilating, or Air Conditioning (HVAC) system. BACKGROUND 10 The reference to any prior art in this specification is not, and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge. Flexible ductwork is used to transport air from a Heating, Ventilating, or Air 15 Conditioning (HVAC) unit to an outlet or vent. A type of known insulated ductwork includes a first polyethylene terephthalate (PET) film layer, a polyester layer surrounding the first PET film layer and a second PET film layer surrounding the polyester layer. The polyester provides 20 insulation properties and each PET file layer is fluid impervious to seal the polyester layer from condensation which forms either inside or outside the ductwork. This flexible ductwork typically has a thermal resistance value (R value) of about 1. 25 With electricity costs ever increasing, the applicant has perceived a need for improved ductwork for reducing electricity costs associated with running HVAC systems. SUMMARY OF THE INVENTION 30 According to one aspect of the present invention, there is provided ductwork for a Heating, Ventilating, or Air Conditioning (HVAC) system, the ductwork including: a first polyethylene terephthalate (PET) film layer; 2 a first polyester layer surrounding the first PET film layer; a second PET film layer surrounding the first polyester layer; a second polyester layer surrounding the second PET film layer; and a third PET film layer surrounding the second polyester layer. 5 The preferred embodiment provides ductwork having an increased thermal resistance value (R-value) whilst still remaining flexible to facilitate installation. According to another aspect of the present invention, there is provided 10 ductwork for a Heating, Ventilating, or Air Conditioning (HVAC) system, the ductwork including: a first fluid impervious layer; a first insulation layer surrounding the first fluid impervious layer; a second fluid impervious layer surrounding the first insulation layer; 15 a second insulation layer surrounding the second fluid impervious layer; and a third fluid impervious layer surrounding the second insulation layer. Each fluid impervious layer may include metallized aluminium polyethylene 20 terephthalate (PET) film. The first fluid impervious layer may include parallel wire hoops bonded between a pair of PET film sheets. Each insulation layer may include polyester. The polyester may have a minimum density of 380 gsm. Each insulation layer may be about 35mm thick 25 at full recovery. The ductwork may have a thermal resistance value (R-value) exceeding 2.0. Preferably, the ductwork has an R-value of about 2.9. This increased R-value desirably results in lesser heat losses, and thereby ultimately reduces the 30 electricity costs associated with running HVAC systems.
3 BRIEF DESCRIPTION OF THE DRAWINGS Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient 5 information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows: 10 Figure 1 is a perspective view of ductwork in accordance with an embodiment of the present invention; and Figure 2 is a sectional view of the ductwork of Figure 1. 15 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS According to an embodiment of the present invention, there is provided ductwork 2 shown in Figures 1 and 2 for a Heating, Ventilating, or Air Conditioning (HVAC) system (not shown). The ductwork 2 includes an inner 20 tubular fluid impervious layer 4 bounding an air passage 3, and an inner insulation layer 6 surrounding the inner fluid impervious layer 4. An intermediate fluid impervious layer 8 surrounds the inner insulation layer 6. An outer insulation layer 10 surrounds the intermediate fluid impervious layer 8. The ductwork 2 also includes an outer fluid impervious layer 12 surrounding 25 the outer insulation layer 10. The preferred embodiment provides ductwork 2 having an increased thermal resistance value (R-value) compared with known ductwork, whilst still remaining flexible to facilitate installation. Each fluid impervious layer 4, 8, 12 includes metallized aluminium 30 polyethylene terephthalate (PET) film. The inner fluid impervious layer 4 includes high tensile wire in the form of spaced apart parallel wire hoops bonded between a pair of PET film sheets. The hoops provide the core of the ductwork 2 with structural stability whilst maintaining flexibility. The intermediate fluid impervious layer 8 and outer fluid impervious layer 12 each 4 consist of a single PET film sheet of less than 1mm thickness. The stretched PET is used for its high tensile strength, chemical and dimensional stability, reflectivity, gas and aroma barrier properties and electrical insulation. 5 Each insulation layer 6, 10 includes polyester material. The polyester has a minimum density of 380 grams per square metre (gsm). Each insulation layer 6, 10 is between 20 and 50 mm thick at full recovery, and preferably about 35mm thick at full recovery. 10 The ductwork 2 has a thermal resistance value (R-value) exceeding 2.0. Preferably the R-value is about 2.9 and is considerably greater than known ductwork with an R-value of about 1. Surprisingly, the ductwork 2 of the present embodiment is of about twice the thickness of the known ductwork, yet the R-value of the ductwork 2 is advantageously about threefold. This 15 increased R-value desirably results in lesser heat losses, and thereby ultimately reduces the electricity costs associated with running HVAC systems. In summary, the ductwork 2 includes: 20 a first polyethylene terephthalate (PET) film layer 4; a first polyester layer 6 surrounding the first PET film layer 4; a second PET film layer 8 surrounding the first polyester layer 6; a second polyester layelO r surrounding the second PET film layer 8; and 25 a third PET film layer 12 surrounding the second polyester layer 10. A person skilled in the art will appreciate that many embodiments and variations can be made without departing from the ambit of the present invention. 30 In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of 5 putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted by those skilled in the art.
Claims (5)
1. Ductwork for a Heating, Ventilating, or Air Conditioning (HVAC) system, the ductwork including: a first polyethylene terephthalate (PET) film layer; a first polyester layer surrounding the first PET film layer; a second PET film layer surrounding the first polyester layer; a second polyester layer surrounding the second PET film layer; and a third PET film layer surrounding the second polyester layer.
2. Ductwork for a Heating, Ventilating, or Air Conditioning (HVAC) system, the ductwork including: a first fluid impervious layer; a first insulation layer surrounding the first fluid impervious layer; a second fluid impervious layer surrounding the first insulation layer; a second insulation layer surrounding the second fluid impervious layer; and a third fluid impervious layer surrounding the second insulation layer.
3. Ductwork as claimed in claim 2, wherein the first fluid impervious layer includes wire bonded between a pair of PET film sheets.
4. Ductwork as claimed in any one of claims 2 or 3, wherein each fluid impervious layer includes metallized aluminium polyethylene terephthalate (PET) film.
5. Ductwork as claimed in any one of claims 2 to 4, wherein each insulation layer includes polyester and the ductwork has a thermal resistance value (R value) exceeding 2.0. Dated this 15th day of June 2010 ROHAN WEBLEY
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2010100608A AU2010100608A4 (en) | 2010-06-15 | 2010-06-15 | Ductwork |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2010100608A AU2010100608A4 (en) | 2010-06-15 | 2010-06-15 | Ductwork |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2010100608A4 true AU2010100608A4 (en) | 2010-08-05 |
Family
ID=42629425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2010100608A Ceased AU2010100608A4 (en) | 2010-06-15 | 2010-06-15 | Ductwork |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2010100608A4 (en) |
-
2010
- 2010-06-15 AU AU2010100608A patent/AU2010100608A4/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |