Tewi for various refrigerants

[marc5180]

Hi does anyone have a list for different refrigerants for calculating Tewi?
I have tried looking online but all i get is how to do the calculation and i know how to do that.
Thanks

[Brian_UK]

There are some numbers in this document, whether it helps or not I'm not sure.

http://www.solvay-fluor.com/docroot/fluor/static_files/attachments/c_06.pdf

[Argus]

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It doesn't work like that.

First, you obtain the formula for TEWI.

When you have that, the GWP for the refrigerant in question is the component that you need to insert in the equation.


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[marc5180]

Thanks Brian.

Argus; I have the formula, i got it confused . It's the GWP of each refrigerant that i was after.

[marc5180]

It's ok, i found the following which is of some use.
http://www.engineeringtoolbox.com/refrigerants-properties-d_145.html

Thanks

[Argus]

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There is more than one way of expressing GWP. The accepted way (and it gets revised from time to time) is the 100 year horizon of atmospheric molecular decay.

Most governments and official bodies accept the methodology of the Intergovernmental Panel on Climate Change (IPCC) - worth a google, but very scientific.
http://www.ipcc.ch/ Look for the reports from Working Group 5 on Industrial gases.

If you have a copy of EN 378, the ODPs and GWPs are listed in Part 1. It also has a basic TEWI formula in one of the annexes.
It's probably the best one to quote in the UK because it is an EN and is harmonised with the PED.

Alternatively you can consult the main standard on refrigerant classification, ASHRAE 34. The basic standard is costly, but the Addenda amendments are free from ASHRAE's site and list the information you want. http://www.ashrae.org/technology/page/132

If you are doing it as an exercise for an exam, be sure to quote and demonstrate a clear, concise reasoning process for the assumptions that you have to make, i.e. losses through leakage and lifetime use.

Good luck.

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