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Thread: Less refrigerant used
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02-03-2009, 08:25 AM #1
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Less refrigerant used
Here is claim:
10.1.1 Specific features
(1) Less refrigerant charge amount due to use of double phase refrigerant flow system. The total refrigerant charge amount has been
reduced by more than 50%.
And here is refrigerant diagram:
Could someone explain how this works and what is function of these marked parts in this refrigeration circle in both heating and cooling mode, since I found it difficult to understand?
And this is another variance:
Last edited by nike123; 02-03-2009 at 08:41 AM.
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02-03-2009, 07:20 PM #2
Re: Less refrigerant used
I guess in cooling mode part2 is for oil return from accumulator.
Part 1 is for "flash gas+ liquid" injection in suction line if discharge temp. (thermistor Th-d) becomes too high.
Part 3 is to increase sub cooling. In this case after the capillary tube we have less capacity decrease.
Part 4 is used in heating mode to prevent outdoor heat exchanger frosting (thermistor Tho-R)
P.S. All above is IMHO
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02-03-2009, 10:58 PM #3
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03-03-2009, 04:27 PM #4
Re: Less refrigerant used
Is it really like this? Have you compared the refrigerant charge with Daikin or ME units charge for the same capacity?
Last edited by narkom; 03-03-2009 at 04:33 PM.
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03-03-2009, 05:42 PM #5
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04-03-2009, 10:58 AM #6
Re: Less refrigerant used
ME charges 2.2 kg for heat pump of 5.4kW.
I guess MHI with 1.1 kg has minimum sub cooling in condenser. Note that they give only 20m height difference for 208 and 258 units.
ME gives 40m.
So no miracle at all))
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04-03-2009, 01:10 PM #7
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04-03-2009, 08:32 PM #8
Re: Less refrigerant used
ME has a large suction accumulator and comes already charged for 30 m.
MHI is charged for 5 m.
Concerning "double phase refrigerant flow'
I read that the
condensed high pressure refrigerant is reduced in pressure by the capillary tubes in the outdoor unit. This results in a “two-
phase refrigerant” of reduced pressure in the liquid section of the piping. The density of this two-phase refrigerant is 1/3~
1/2 of that of the high pressure liquid refrigerant, and thus is required in smaller amounts . As a result,
the length of the piping can be extended further, and the effects of height differences are reduced.
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04-03-2009, 08:58 PM #9
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05-03-2009, 03:57 PM #10
Re: Less refrigerant used
http://www.mrslim.com/UploadedFiles/...C%20PUH-EK.pdf
The same circulation system.
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05-03-2009, 07:23 PM #11
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