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Method for circulating selected heat transfer fluids through a closed loop cycle

a heat transfer fluid and closed loop technology, applied in the field of closed loop cycle circulating of selected heat transfer fluids, can solve the problems of complex manufacturing processes, toxic replacements, low energy efficiency, global phase out of certain hfc refrigerants, etc., and achieve simple and straightforward construction and improved barrier properties.

Inactive Publication Date: 2009-12-24
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The present invention relates to transporting a heat transfer fluid within a refrigeration or air conditioning system through a hose, where the hose is able to withstand high-pressure refrigerants, and the hose has improved barrier properties. A further advantage of such hose is its simple and straightforward construction. In a particular embodiment, such hose is especially suitable for use with fluoroolefin compositions which are low GWP refrigerant alternatives. These and other objects, features and advantages of the present invention will become better understood upon having reference to the description of the invention herein.

Problems solved by technology

Further environmental regulations may ultimately cause global phase out of certain HFC refrigerants.
Many of these suggested replacements are toxic, flammable, and / or have low energy efficiency.
Such constructions, however, require complex manufacturing processes, and are expensive for large scale uses.
Also, expensive fluoropolymer layers are incorporated in the hose construction.
With the drive for reduced emissions, this becomes an issue in highly demanding applications such as refrigeration and air conditioning.

Method used

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  • Method for circulating selected heat transfer fluids through a closed loop cycle
  • Method for circulating selected heat transfer fluids through a closed loop cycle
  • Method for circulating selected heat transfer fluids through a closed loop cycle

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0142]A hose is constructed according to one embodiment of the invention in the following manner. A mandrel is first made in the form of a solid rod with a diameter of 6.4 mm. A veneer consisting of an inner layer of 0.65 mm thick Zytel® 42 (a high MWA 66 commercially available from E.I. du Pont de Nemours and Company) and 0.1 mm thick outer tie layer of Bynel® 4206 (a maleic anhydride grafted polyethylene commercially available from E.I. du Pont de Nemours and Company) is extruded over the mandrel. The assembly is then laminated with a metal-polymer laminate available as BFW 46 and obtained from James Dawson Enterprises Ltd of Lachine, Quebec, Canada. The laminate consists of an inner layer of low density polyethylene, a tie layer of EEA, an aluminum foil (10 micron thick) and an outer layer of polyethylene terephthalate (PET) with a total thickness of 0.1 mm. Lamination is carried out using a heated die with a passage way of appropriate size to pass the assembly through. The assem...

example 2

[0143]Samples of hoses as described Example 1 were tested for hose permeation following the procedure outlined in Standard SAE J2064. Lengths of hose were cut and fitted at the ends to contain refrigerant. Hoses were charged with refrigerant to 70% by volume. Hoses were then placed in an oven and held at 80 C for 28 days. Hoses were periodically removed and weighed to determine refrigerant loss. An overall loss or permeation rate was then determined in kg / m2 / yr. Results are shown in Table 9.

TABLE 9Hose Permeation RateRefrigerant Composition(kg / m2 / yr)R134a0.441225ye / R32 (95 / 5 wt %)0.451225ye / 1234yf / 134a (45 / 45 / 10 wt %)0.07

[0144]Results show hoses permeation for fluoroolefin compositions are at least equivalent to R134a. Since R32 is a small molecule, it contributes the most to hose permeation. The composition containing primarily fluoroolefins and a small amount of R134a had significantly lower permeation than R134a alone indicating, indicating fluoroolefins have overall lower permea...

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Abstract

The present invention relates to the use of flexible hoses capable of handling high pressure fluids and providing a barrier against permeation loss in air conditioning and refrigeration systems. Such hoses are particularly suitable in air conditioning and refrigeration in which new, low global warming potential refrigerant alternatives are used.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the use of flexible hoses capable of handling high pressure fluids and providing a barrier against permeation loss in air conditioning and refrigeration systems. More particularly, the present invention relates to the use of such hoses in air conditioning and refrigeration systems, including mobile air conditioning systems, in which new, low global warming potential (GWP) refrigerant alternatives are used.[0003]2. Description of Related Art[0004]The refrigeration industry has been working for the past few decades to find replacement refrigerants for the ozone depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) being phased out as a result of the Montreal Protocol. The solution for most refrigerant producers has been the commercialization of hydrofluorocarbon (HFC) refrigerants. The new HFC refrigerants, HFC-134a being the most widely used at this time, have zero ozo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B1/00
CPCC09K5/045C09K2205/106C09K2205/11C09K2205/134C09K2205/122C09K2205/126C09K2205/12F15D1/02
Inventor MINOR, BARBARA HAVILANDBIVENS, DONALD BERNARDDOSHI, SHAILESH RATILALRAO, VELLIYUR NOTT MALLIKARJUNASIMONATO, ENRICO
Owner EI DU PONT DE NEMOURS & CO
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