Multiple condensors

[Peter_1]

Excisting condensor.

What about installing a second one (increasing capacity) but not of the same size as the original one?
First case a bigger one and in a second case a smaller one?

What should be done/installed/foreseen so that both are 'fed' with correct capacity? So that the discharge gasses don't follow the way of least resistance.
Purpose is try to condens as low as possible.
Is it anyway possible?

Any comment is welcome

[Mark]

Hi peter

Yes ive seen this done two condensers side by side one smaller than the other.
I believe as long as the pipe work is teed off equally the losses to one condenser would be negligible.

Mark

[Mark]

Remembering that the evaparator and condenser must have equal capacities

[rbartlett]

Remembering that the evaparator and condenser must have equal capacities

why? what happens to 'heat of compression' ?


cheers

richard

[Mark]

LOL just read my post

It would be true if refering to a condensing unit

[Peter_1]

It's on a pack. Client had problems last summer with too less condensor capacity and needed to spray water on them.

Engineering office said that if you don't install exact the same condensor, it will never work. Because actual condensor is an older type, there must be installed two new ones or a big one.

I disagreed with him because we sometimes uses recup condensors which we had to take over when installing new ones. And in many cases , they're from different brands and size. It worked but I never measured temperatures or pressures over the condensors.

[Latte]

Hi Peter,
You want to come and work over here. Last summer all the major supermarkets were spraying water on condensers to stop them tripping out in this area. Tescos,Sainsburys,Morrisons,Somererfield are the ones i know about. It's all down to cost as per usual. One year these people might realise that ambients can hit 30 degree's in the UK. Until then we will just have to keep buying garden hoses & sprinklers from the DIY stores

Regards

Raymond

[Latte]

Hi Guys, just had a thought (Dont knock it)

All Major retailers put their condensers on the roof so in summer the sun beats down on them all day. Has anyone ever tried to build a canopy over the top the stop the sun going directly onto them or would it just prevent the heat escaping & therefore not work.

Regards

Raymond

[Andy]

Hi
if you are using a vee block type condenser you can fit a minimiser type system, in essence a set of sprinker heads with a mesh curtain to reduce drift, much easier that a new condenser.
A smaller condenser fitted with a large one, no problem provided you trap the condenser outlets to craete a liquid column, or possibly pipe both both outlets into a low velocity header witha slope away from the condensers and a liquid opt on the end to ensure gas doesn't enter the liquid line.
Mark equal tee's don't work properly on any conderser configuation , you might be able to get this to work if you cycled fans on a mirror image sequence, but even that is touch and go
trap the outlets and create a liquid column, much easier.
poor condenser pipe work is a common thing on supermarket installations, nice big well sized condensers, mostly piped incorrectly.
and the multiples wonder why they had bother last year

Kind Regards. Andy.

[Mark]

Andy the things you point out i felt didnt need explaining to peter as i guessed he would probably know these points .

[Andy]

Hi Mark
well that's me put in my place
Kind Regards. Andy

[rbartlett]

Hi Guys, just had a thought (Dont knock it)

All Major retailers put their condensers on the roof so in summer the sun beats down on them all day. Has anyone ever tried to build a canopy over the top the stop the sun going directly onto them or would it just prevent the heat escaping & therefore not work.

Regards

Raymond

we quoted some work in saudi -so we shipped the units and a load of wood to make such a shelter

when we got there we noted that no other bugger bothered so when we flew out again there was a pile of wood left on site...

cheers


richard

[Latte]

[QUOTE=Andy]Hi
if you are using a vee block type condenser you can fit a minimiser type system, in essence a set of sprinker heads with a mesh curtain to reduce drift, much easier that a new condenser.

Hi Andy,
For us Uneducated ones whats a vee block type condenser & do you know of a website or have any info on the sprinkler system.

Regards

Raymond

[Andy]

Raymond
vee block is just two coil blocks mounted in the shape of a vee with the fans on top, used a lot in packaged water chiller.
As for the minimisers, I don't know of a web site, but I will ask the guy who fitted them on various sites i've been on to tell us where he got them.
Kind Regards.Andy

[frank]

Have a look at this site http://www.epsltd.co.uk/EcoMESHcatalogue.pdf on page 4 there is a picture of a V block condenser at bottom left

[RogGoetsch]

Studied this many years ago and only remember that the problem is in pressure differential which can back refrigerant up into one condenser.

Solution was to calculate proper line size (larger than expected) between both condensers and the receiver, which would allow pressure equalization between components.

Suspect the Prof could provide a more sophisticated answer.

Rog

[Mark C]

Studied this many years ago and only remember that the problem is in pressure differential which can back refrigerant up into one condenser.

Solution was to calculate proper line size (larger than expected) between both condensers and the receiver, which would allow pressure equalization between components.

Rog

Exactly, Rog!! Symmetrical piping inbound with no one inlet being favored in flow. Oversized lines equalizing pressures to ensure gravity drain into trapped piping. I remember Phaklides' lessons almost word for word!