Assessment of leakage rate and durability of field-made mechanical joints for systems using low-GWP flammable refrigerants (ASHRAE RP-1808)

Neal Lawrence, Sharat Raj, Stefan Elbel

Research output: Contribution to journalConference article

Abstract

The conversion of refrigeration and air-conditioning systems to low-GWP refrigerants, such as HFO's, has raised many concerns about the flammability of potential replacement refrigerants, particularly regarding the potential leakage of flammable refrigerant from mechanical joints. This paper presents the results of a study investigating the durability and leakage rate of different types of field-made joints used in refrigeration and air-conditioning systems, focusing on flame-free joining methods and systems with flammable refrigerants. Three different types of fittings were investigated: Press/crimp fittings, compression fittings, and flare fittings. For each type of fitting, two different sizes were used as well as two different tubing materials (copper and aluminum). Brazed joints were also investigated as a baseline. Durability testing in the form of pressure-temperature thermal cycling, freeze-thaw cycling, and vibration testing was performed on all combinations of fittings. Refrigerant leakage rates were also determined for all combinations of fittings.

Original languageEnglish (US)
Pages (from-to)104-111
Number of pages8
JournalRefrigeration Science and Technology
VolumePart F147651
DOIs
StatePublished - Jan 1 2018
Event1st IIR International Conference on the Application of HFO Refrigerants, HFO 2018 - Birmingham, United Kingdom
Duration: Sep 2 2018Sep 5 2018

Fingerprint

refrigerants
Refrigerants
durability
Durability
leakage
Refrigeration
Air conditioning
air conditioning
Flammability
Testing
Thermal cycling
Tubing
Joining
flammability
cycles
Copper
Aluminum
flares
flames
aluminum

Keywords

  • Durability testing
  • Flammable refrigerants
  • Low-GWP refrigerants
  • Mechanical joining methods
  • Refrigerant leakage rate

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Assessment of leakage rate and durability of field-made mechanical joints for systems using low-GWP flammable refrigerants (ASHRAE RP-1808). / Lawrence, Neal; Raj, Sharat; Elbel, Stefan.

In: Refrigeration Science and Technology, Vol. Part F147651, 01.01.2018, p. 104-111.

Research output: Contribution to journalConference article

@article{f5471b6501a84fc29c66be23c82f7532,
title = "Assessment of leakage rate and durability of field-made mechanical joints for systems using low-GWP flammable refrigerants (ASHRAE RP-1808)",
abstract = "The conversion of refrigeration and air-conditioning systems to low-GWP refrigerants, such as HFO's, has raised many concerns about the flammability of potential replacement refrigerants, particularly regarding the potential leakage of flammable refrigerant from mechanical joints. This paper presents the results of a study investigating the durability and leakage rate of different types of field-made joints used in refrigeration and air-conditioning systems, focusing on flame-free joining methods and systems with flammable refrigerants. Three different types of fittings were investigated: Press/crimp fittings, compression fittings, and flare fittings. For each type of fitting, two different sizes were used as well as two different tubing materials (copper and aluminum). Brazed joints were also investigated as a baseline. Durability testing in the form of pressure-temperature thermal cycling, freeze-thaw cycling, and vibration testing was performed on all combinations of fittings. Refrigerant leakage rates were also determined for all combinations of fittings.",
keywords = "Durability testing, Flammable refrigerants, Low-GWP refrigerants, Mechanical joining methods, Refrigerant leakage rate",
author = "Neal Lawrence and Sharat Raj and Stefan Elbel",
year = "2018",
month = "1",
day = "1",
doi = "10.18462/iir.hfo.2018.1115",
language = "English (US)",
volume = "Part F147651",
pages = "104--111",
journal = "Refrigeration Science and Technology",
issn = "0151-1637",

}

TY - JOUR

T1 - Assessment of leakage rate and durability of field-made mechanical joints for systems using low-GWP flammable refrigerants (ASHRAE RP-1808)

AU - Lawrence, Neal

AU - Raj, Sharat

AU - Elbel, Stefan

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The conversion of refrigeration and air-conditioning systems to low-GWP refrigerants, such as HFO's, has raised many concerns about the flammability of potential replacement refrigerants, particularly regarding the potential leakage of flammable refrigerant from mechanical joints. This paper presents the results of a study investigating the durability and leakage rate of different types of field-made joints used in refrigeration and air-conditioning systems, focusing on flame-free joining methods and systems with flammable refrigerants. Three different types of fittings were investigated: Press/crimp fittings, compression fittings, and flare fittings. For each type of fitting, two different sizes were used as well as two different tubing materials (copper and aluminum). Brazed joints were also investigated as a baseline. Durability testing in the form of pressure-temperature thermal cycling, freeze-thaw cycling, and vibration testing was performed on all combinations of fittings. Refrigerant leakage rates were also determined for all combinations of fittings.

AB - The conversion of refrigeration and air-conditioning systems to low-GWP refrigerants, such as HFO's, has raised many concerns about the flammability of potential replacement refrigerants, particularly regarding the potential leakage of flammable refrigerant from mechanical joints. This paper presents the results of a study investigating the durability and leakage rate of different types of field-made joints used in refrigeration and air-conditioning systems, focusing on flame-free joining methods and systems with flammable refrigerants. Three different types of fittings were investigated: Press/crimp fittings, compression fittings, and flare fittings. For each type of fitting, two different sizes were used as well as two different tubing materials (copper and aluminum). Brazed joints were also investigated as a baseline. Durability testing in the form of pressure-temperature thermal cycling, freeze-thaw cycling, and vibration testing was performed on all combinations of fittings. Refrigerant leakage rates were also determined for all combinations of fittings.

KW - Durability testing

KW - Flammable refrigerants

KW - Low-GWP refrigerants

KW - Mechanical joining methods

KW - Refrigerant leakage rate

UR - http://www.scopus.com/inward/record.url?scp=85066029005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85066029005&partnerID=8YFLogxK

U2 - 10.18462/iir.hfo.2018.1115

DO - 10.18462/iir.hfo.2018.1115

M3 - Conference article

AN - SCOPUS:85066029005

VL - Part F147651

SP - 104

EP - 111

JO - Refrigeration Science and Technology

JF - Refrigeration Science and Technology

SN - 0151-1637

ER -