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Einstein cycle

  1. Jul 15, 2005 #1
    I'm sure most of you have heard of the Einstein Referigeration Cycle .
    For those who have not i've listed the references for further reading..
    http://www.me.gatech.edu/energy/pubs/SLA_2.pdf
    ok 342 K is about 156 F ,for anyone with an attic , it seems to me that this is the perfect solution to keeping all of us cool in the summer..


     
  2. jcsd
  3. Jul 16, 2005 #2

    Clausius2

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    Interesting information, willib. I will take a look at the pdf document. Anyway there are lots of traditional absorption chillers (LiBr-H20) which don't need any pump. The pumping process is made via gravitational force. We have one in a laboratory of my university.
     
  4. Jul 16, 2005 #3
    Clausius2 have you got any info on the (LiBr-H20) absorption chillers.?
    the only thing on them i could find on google was on the IEEE site , and not being a member , i wasnt able to access the document..
    i'll try registering ..
     
  5. Jul 17, 2005 #4

    Clausius2

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    When I studied them I had to take a look at Trane and Yazaki web catalogs. Google them.
     
  6. Jul 18, 2005 #5
    My experience with LiBr+water VAS is very bad. Industrial systems do require a pump for LiBr solution and a pump for refrigerant(water) as well. The power consumed by these two pumps are not considered while calculating COP(to get a high COP). Some manufacturers claim a COP of 1.5 with double effect systems but I was never able to get beyond 1. Further, you have to provide more cooling water flowrate, when compared to vapor compression systems, as LiBr is to be cooled down for better water absorption.

    LiBr is highly corrosive and yearly cleaning of the solution and internals is compulsory. Capacity control is almost nill with these systems and evaporator flooding is the most common trouble at low loads. Cooling water temperature below 21deg.C is well enough to crystallize the strong solution(about 61%). When you operate chilled water at 5deg.C, vacuum in the system should be 4mm Hg abs. Air ingress into the system will deteriorate the capacity and causes severe corrosion.

    I recommend these systems if and only if you have waste heat, otherwise you will be the happiest guy with a vapor compression system.

    Fundamentals of Air Conditioning by Shan K Wang has good description and design principles about these systems.
     
  7. Jul 18, 2005 #6
    The Einstein cycle
     

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  8. Jul 18, 2005 #7
    Does anyone know if Einstein used a bubble pump ??
    Being more of an electonic type guy , and the fact that water is a magnetic dipole molecule. i am wondering wether or not you could help the process along by using electro-magnetic induction ( a coil of wire wrapped around the tube), in place of the bubble pump...
     
  9. Jul 19, 2005 #8

    Clausius2

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    Great. If every people think as you, we will have a great amount of atmospheric pollution in a near future. You are forgetting the great enviromental impact that compression systems have. They have three main impacts: i)the Ozone Depletion Potential, ii)the indirect global warming effect caused by the fossil fuel burned in a power plant to feed the compressor power, and iii)the direct global warming effect caused by the refrigerant released into the atmosphere. Yeah, some time ago the people began to be afraid about this stuff, they were "happy guys" with compression systems till a NASA study gave us the information of the ozone layer depletion. From then to nowadays there have been a great effort to develop clean refrigeration systems, and absorption chillers are some of them.

    Although you are not going to be a happy guy with an absorption chiller, at least you are not collaborating to destroy the environment.
     
  10. Jul 19, 2005 #9
    It is a wrong notion that absorption chillers are eco friendly. Infact, bromine is 50times more destructive, to ozone layer, than chlorine. Perhaps, you forgot that CO2 plays a substantial role in global warming. The electricity used for vapor compression systems is generated from good many sources apart from burning fuels, where as there is no alternative for vapor absorption systems except burning fuel and releasing CO2 into the atmosphere. At any capacity, if we presume power is generated from burning fuels alone, the amount of CO2 released will be higher for a VAS than VCS, for the COP of a VAS is much less than a VCS. Cooling water flowrates required for a VAS is more, so more treatment chemicals and more pollution.

    The capacity control of a VAS is virtually nill, so the power consumption at lower loads is extremely high when compared to a VCS.

    If you go into the trivials, the size of a VAS is much bigger, for any capacity, than a VCS and this requires more metal to be put into the manufacturing and so more duration of operation of a furnace which results in further CO2 release into the atmosphere. When LiBr fully crystallizes in the system, which is very common to VAS, you have to externally heat the low temperature heat exchangers. LiBr is a carcinogen. The part replacement for a VAS is more frequent when compared to a VCS.

    No, I am not corroborating the destruction of environment. What I am suggesting is to judge the overall scenario. On personal front, I never used an air conditioner in my home nor I will in future.

    Regards,
     
  11. Jul 19, 2005 #10
    Butane Water and Ammonia are the three ingrediants i'm interrested in.
    and to my knowlege cooling water isnt required in the Einstein cycle..
     
  12. Jul 19, 2005 #11

    Clausius2

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    For running an absorption chiller is not needed any CO2 at all. Although the COP is much less, there is no global indirect warming effect caused by the electricity generated for running the compressor. I don't know about the cancerigen capacity of LiBr, but let's try with NH3. Although NH3 is very dangerous when it is released to ambient, it has zero Ozono Depletion Potential.
     
  13. Jul 20, 2005 #12
    how difficult do you thing it would be to construct a working model of the Einstein referigerator.?
     
  14. Jul 21, 2005 #13
    this doesnt look that difficult..
     

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