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Anonymous Poster

410-A refrigerant properties

01/06/2010 10:35 PM

Can 410-A refrigerant hold more energy for every cubic inch than its counterpart r-22; if so, is this an implication that for the same amount of cooling, less refrigerant must circulate through the system and therefore less amount of power is consumed. So if a smaller motor for the compressor can be used, then the suction line can also use a smaller size. If all this is accurate; does anyone know where can I find 410-A property tables and enthalpy charts. If my reasoning is not correct, can someone guide me in the right direction, thanks in advance.
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lyn
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#1

Re: 410-A refrigerant properties

01/06/2010 10:42 PM

Google:

410-A property tables and enthalpy charts.
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Anonymous Poster
#2

Re: 410-A refrigerant properties

01/06/2010 11:05 PM

Please pay particular attention to these statements:

..... R-410A is a higher pressure and capacity refrigerant than R-22, requiring equipment and components specifically designed to accommodate the resulting higher system pressures and lower flow rates needed. Typical operating pressures of an R-410A system will be 50% to 60% higher than those in an R-22 system at comparable operating conditions. R-410A also has significantly higher volumetric refrigerating capacity than R-22 under most operating conditions. This allows OEMs to manufacture equipment of similar capacity and efficiency to R-22 in a smaller package....

................

Retrofit:

Due to the significantly higher operating pressures and capacities of R-410A, it should never be used as a retrofit for R-22 systems. R-410A should only be used with equipment designed specifically for use with R-410A.

http://www.arkema-inc.com/index.cfm?pag=37
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Anonymous Poster
#4
In reply to #2

Re: 410-A refrigerant properties

01/06/2010 11:27 PM

Thank you very much those sites gave all the help I needed.
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Tornado
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#3

Re: 410-A refrigerant properties

01/06/2010 11:25 PM

(Replying to the original post):

That's part of the picture, but by no means all. For instance it might hold more energy per cubic inch of liquid, but then expand more and hold less energy per cubic inch of vapor. Or it might take more horsepower to compress it, even if the mass flow rate is less. Any comparisons are case-by-case, taking into account temperatures, pressures, horsepower, valve and pipe sizing, cost, etc.

As I recall the DuPont Website has useful information, including refrigerating capacity and horsepower comparisons. It has been some time since I looked at it, but I don't remember P-h charts being available at the time. Maybe now, though. "Alternate refrigerants" might be worth searching.

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PWSlack
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#5

Re: 410-A refrigerant properties

01/07/2010 7:51 AM

Look up refrigerants in Wikipedia.

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Anonymous Poster
#6

Re: 410-A refrigerant properties

01/09/2010 9:56 AM

is it (R-410) recommended for use in topical countries (115 F) ?
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mrswamy
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#7

Re: 410-A refrigerant properties

01/10/2010 2:55 AM

R-410A is an azeotropic mixture of two hydrofluorocarbon (HFC) refrigerants blended in a 50-50 ratio (measured by mass):

R-32 (difluoromethane)

R-125 (pentafluoroethane)

Comparison of Refrigerant Physical Properties

ASHRAE Number

R-410A

R-22

Type of refrigerant HFC azeotropic mixture of HFC-32 and HFC-125 HCFC
Chemical name Difluoromethane (R-32) Pentafluoroethane (R-125) Chlorodifluoromethane
Chemical formula CH

2F2 (R-32) CHF2CF3 (R-125)

 CHClF

2

Composition (by mass) R-32 50% R-125 50% N/A
Molecular weight 72.6 86.5
Boiling point (at 1.0 atm.), °F -62.9 -41.4
Freezing point (at 1.0 atm.), °F -247 -256
Critical temperature, °F 163 205
Critical pressure, psia 720 722
Saturated liquid density (at 86°F), lb/ft

3

64.64 73.09
Specific heat of liquid (at 86°F), Btu/lb-°F 0.42 0.31
Specific heat of vapor at constant pressure C

p (at 86°F and 1.0 atm.), Btu/lb-°F

 0.21 0.16
Flammable range (% volume in air) (Note 1) None None
ANSI/ASHRAE Standard 34-1992 Safety Group Classification A1 A1
Ozone depletion potential (ODP) (Notes 2 and 4) 0.00 0.05

5

Global warming potential (GWP), 100 yr. (Notes 3 and 4) 1,997 1,780
Montreal Protocol phase out date None 2030
Notes:

1. Based on ASHRAE Standard 34 - 2001 Designation and Safety Classification of Refrigerants.

2. ODP: a normalized indicator of the ability of a refrigerant to destroy stratospheric ozone molecules referenced to a value of 1.000 for CFC-11.

3. GWP: a mass-weighted average indicator of the ability to trap radiant energy as a greenhouse gas relative to carbon dioxide (CO2) for a 100-year integration period.

4. Information sources: Honeywell (2003), ANSI/ASHRAE Standard 34-2001, and ODP and GWP data WMO (2002).

During late nintees researchers found that of all eight refrigerants examined, R-410A had the best performance from the point of view of energy efficiency and TEWI.In new commercial air-conditioning systems designed to use R410 refrigerant with scroll or reciprocating compressors, tests have shown the R410A air conditioner to be 5 to 6 percent more efficient than a comparable R-22 system, while operating in a typical application range. R410A refrigerant has a much higher specific heat in both liquid and vapor form than R22. Besides R410A refrigerant operates at a higher pressure, the refrigerant gas density is higher, enabling a unit to operate at lower volumetric flow rates than a comparable R-22 unit. Since total heat transfer is a function of mass flow rate smaller, slower and somewhat quieter compressors can be utilized. For more details please refer carrier web site.
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Anonymous Poster
#8

Re: 410-A refrigerant properties

08/15/2010 6:34 PM

look here http://www.chlodnictwo.info.pl/index.php/czynniki-chodnicze/37-czynniki-chodnicze.html
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