:p:p
Note the mathematical model COP against actual
http://www.waset.org/journals/waset/v43/v43-48.pdf
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:p:p
Note the mathematical model COP against actual
http://www.waset.org/journals/waset/v43/v43-48.pdf
Note the tone of the introduction. How credible can a "scientific" study be when it is, by its own admission, politically motivated?
I do not know if it is worth doing other simulations, because all I would be doing estimating what I think may happen (even if the program is 100% correct, it is only as good as the inputed data.)
I was hoping coldwine may have come back with real data.
When it comes to whole systems there are so many variables
Compressor, compression efficiency, moter efficiency. should we talk about Kw or Kva.
I see in those articles tha Toosh provided, that the CO2 was oil free, is this actually the case, if not then some form of film is going to form, reducing heat transfer, then what about water fouling, this is going to happen at the high temps indicated.
http://i50.tinypic.com/alkuma.png
This one?
slightly of issue but relevent.
COP of 8
COP of 9
Saving differnce is 1.4%
Always worth thinking about.
^ Very true... 1.389%
Food for thought.
Round two has started the bell has rung, check your seconds and come out fighting. No kicking or low blows please just sound intelligent commentaries please.
Toosh and I are waiting with baited breath.
magoo
Hi desa this is interesting, about wear and tear under high pressures
http://www.stle.org/assets/document/...ard_winner.pdf
Interesting article. I read into it that they are still testing at an operating pressure some 50% of the CO2 maximum operating pressure. We will probably have to see what practical information returns from the field.
Somehow, this info seems to have been sparse - perhaps because most of the machines have been operatonal in Japan, where information flow often seems to be slow in coming, if at all.
Have you seen this
http://jp.sanyo.com/comp-unit/english/co2/about.html
Very nice... :D
wow after all that reading and excitement I'm pretty relieved this thread is over
or is it ;)
HW HW HS HS HW HS HC CC PWR COPh COPt
OUT IN IN OUT
℃ ℃ ℃ ℃ L/min L/min kW kW kW - -
90 15.0 20.0 15.0 17.5 195.0 91.4 68.0 26.3 3.47 6.06
90 20.0 20.0 15.0 17.9 183.0 87.3 63.9 26.3 3.32 5.74
90 25.0 20.0 15.0 18.3 170.3 83.0 59.4 26.4 3.15 5.40
90 30.0 20.0 15.0 18.7 156.8 78.4 54.7 26.4 2.97 5.04
90 35.0 20.0 16.5 19.4 206.4 74.3 50.4 26.6 2.80 4.69
90 45.0 20.0 16.5 20.3 161.8 63.7 39.5 26.7 2.38 3.86
90 50.0 20.0 17.0 20.8 161.6 58.2 33.8 26.8 2.17 3.43
90 55.0 20.0 17.0 21.4 132.2 52.2 27.7 26.9 1.94 2.96
90 60.0 20.0 18.0 22.0 153.7 46.1 21.4 27.1 1.70 2.49
90 65.0 20.0 19.0 22.7 212.3 39.6 14.8 27.2 1.46 2.00
There seems to be a fair bit of hype and fight over this product in this forum. here is the run you asked for plus several others so you can draw your own conclusions
I am sorry I have been away from refrigeration engineer. I will answer what ever I think I can from what I have studied so far.
I posted way back in 2008 about Eco-cutes name being very Japanese. at the time I did not realize how true this was. I have since been applying EC technology in engineering applications in the HVAC and industrial food industry.
"Kyūtō-ki" is were the Cute comes from. "Kyuto" which stands for Hot water supply and "Ki" which is machine or equipment. Eco for economic or ecology Eco-Cute
Eco-cute = Hot Water Supply Equipment, and trust me direct Japanese to English translations do not happen to make sense that often. but this one is the nail in the head
Eco-cute or CO2 Trans-critical are not here to alter or take over the Heat pump market. Eco-cute is a great tool and/or weapon in an engineers arsenal, for HVAC design. Not a replacement.
alot of the times if Eco-cute is compared in heating applications.
Usually based on North American standard low delta - T 10-15 F 200-400 GPM to a market ready chemical/man heat pumps or boiler.
Eco-cute will have a similar COPh with high water temperatures and lower flow. Not a great heating appliance for N/A.
If one can use a modulating flow design, with a much larger delta T (45F is minimum required) Eco-cute can do a good job.
but the design must be taken into consideration early so that it reflects the run characteristics of trans-critical heat pump instead of a standard heat pump appliance.
Were Eco-cute performs is on projects were domestic hot water is involved.
just like the EC name implies! Hot water supply equipment!
High DHW demand suits Eco-cute's abilities well, then do supplementary space heating achieved through a plate exchanger.
Pricing is another issue which is old as time but applied right Eco-cute can make project dollars and sense.
This guy if he was still alive might be mad... Yes the Japanese government had something to do with it but he did all the research http://en.wikipedia.org/wiki/Gustav_...en_(scientist)
Thanks Iceman_4000 for some interesting information. :)