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Thread: What is System balance?
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25-09-2004, 04:56 AM #1
What is System balance?
In my estimation a technician not only needs to understand how the various components work together but he also needs to understand that commercially available components seldom will exactly match the design requirements of a given system, and since system design is normally based on estimated peak loads, the system may often have to operate at conditions other than design conditions. More than one combination of components may meet the performance requirements, the efficiency of the system normally being dependent on the point at which the system reaches stabilized conditions or balances under operating conditions. We know that the capacities of each of the three major system components, the compressor, the condenser, and the evaporator, are each variable but interrelated.
The compressor capacity varies with the evaporating and condensing temperatures and the factors involved in the variation in evaporator capacity are quite complex when both sensible heat transfer and condensation are involved. For component balancing purposes, the capacity of an evaporator where both latent and sensible heat transfer are involved (a wet coil) may be calculated as being proportional to the total heat content of the entering air, and this in turn is proportional to the wet bulb temperature. So because of the many variables involved, the calculation of system balance points is extremely complicated
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25-09-2004, 10:50 PM #2
Re: What is System balance?
Marc..................helpppppp !!!!!
Any opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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26-09-2004, 03:13 AM #3
Re: What is System balance?
Originally Posted by AiyubLast edited by shogun7; 26-09-2004 at 03:18 AM.
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26-09-2004, 01:33 PM #4
Re: What is System balance?
Hello Shogun,
Soreeee, I was just a bit in a crazy mood !!!!!
Hope youre having a nice Sunday !!!
Regards
AbeAny opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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26-09-2004, 01:39 PM #5
Re: What is System balance?
And just to " suck" up to you a bit more...............I think you are a very intelligent , knowleageable man, and I respect you !!
Now , am I still a nice guy ???
LolAny opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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27-09-2004, 12:28 AM #6
Re: What is System balance?
Aiyub: You are more then nice and you made me cry If I misunderstood please accept my apologies
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18-01-2006, 05:44 AM #7
Re: What is System balance?
this long thread is a very worthy topic-I wouldn't like it stop here.
Any system can only work properly within the designed scope.Usually we design the system at 2 or 3 condition point,we can't afford to review all the states.the system "balance automaticlly" according to No1\No2 thermodynamics law. The simulation tool is developed rapidly ,may be it can predict the system performance precisely during design stage some day-
rgds
LCI hear...I forget;I see...I remember;I do...I understand
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18-01-2006, 08:02 AM #8
Re: What is System balance?
Originally Posted by shogun7
It is complicated.
My brother and I did our M.Sc. thesis on System balancing at University College London both for reciprocating and screw systems and I know it is complicated. We also developed two computer programmes ( which we sell it now ) .
System balancing is the behaviour of 3 selected components as a whole unit. Three components because TEV does not come into the balancing equations because balancing means energy balance and as you know in TEV (h3=h4).
For a required design conditions you select proper equipment from their manufacturer. In this selection, you choose a component with the nearest capacity. After connecting the components they will work somehow differently as designed. System balancing will show you how the whole system will work before you buy the equipment.
It is very helpful also for part load estimation. Our recip. programme also does the capacity control with sylinder unloading which is also very helpful in practice.
CheersEven Einstein Asked Questions
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18-01-2006, 12:56 PM #9
Re: What is System balance?
Link seems not working
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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18-01-2006, 10:08 PM #10
Re: What is System balance?
Originally Posted by Marc O'Brien
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19-01-2006, 03:41 AM #11
Re: What is System balance?
Originally Posted by wambat
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19-01-2006, 04:52 AM #12
Re: What is System balance?
system balance is simple if you just take one condition at a time, and this is what a tec will do is take on conition at a time and one componant at a time and work it out.
wesmaxWes Maxfield
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19-01-2006, 06:30 AM #13
Re: What is System balance?
Some never doubt in the capacities and abilities of some for me very valuable posters
Other posts copies of superheat tables but that doesn't botter me, not at all, as long as it is informative for this forum.
Not everybody has the time and the money to sit the whole day....and night... behind the computer.
Some have to work and also a family life with wife and kids and besides that a social life. So there's sometimes no that much spare time for this forum.
BTW, where's Chemi?Last edited by Peter_1; 19-01-2006 at 06:37 AM.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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19-01-2006, 09:47 AM #14
Re: What is System balance?
Chemi told me at Christmas that he was back at college studying after work so he doesn't get much time at the moment to visit the forum.
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