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Can anyone identify these

Can anyone identify these

Can anyone identify these

(OP)
On the attached jpg are two pictures.  First picture "part of fan coil" is due for installation on a roof to be part of the fan coil unit.  What is it & what are the kinds/levels of leakage do they have/if any?

Finally, does anyone recognise the second picture?

RE: Can anyone identify these

1st Looks like a cooling tower but probably is an   economizer with the linked dampers . The 2nd like an Engine/Generator.  As for leakage, ?

RE: Can anyone identify these

1st picture is a cooling tower with modulating dampers for temperature control
2nd picture is a diesel engine driving a generator

RE: Can anyone identify these

Is this a trick question?

RE: Can anyone identify these

(OP)
No trick questions.  I'm just trying to learn as much as possible about HVAC systems and on my journeys as a student surveyor I come across lots of these "beasts" and I am just generally interested in the whole thing.  Reading BS books all day gives a good idea on how they work but when you come across them in life, it's a case of what is that??!!

Thank you for all your help

RE: Can anyone identify these

I'm not convinced that the first picture is a cooling tower.  There are no water connections evident.  Of course, they might me on one of the sides we can't see.

I'd go with economizer module.

RE: Can anyone identify these

Not a cooling tower. That is a set of mixing dampers. These are often used to control the mix of fresh air supply and recirculated air. There are other uses.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Can anyone identify these

If the two are related I would guess that it a water cooled generater, pic 1 is the heat rejection, pic 2 is the generator

RE: Can anyone identify these

(OP)
The pictures are from different buildings (sorry should have mentioned).
Bill. You mentioned that they would be used for control of mixing air. There is also a fan coil system in place.  DOes this mean that there would be a AHU somewhere in the building or can these dampers be connected directly to these coils?
Also if there wasn't any fan coils I assume that they could just be used for ventilation without the need for fan coil or AHU?

RE: Can anyone identify these

No 1 is a mixing box with opposed blade dampers; mixes air for downstream AHU.

No 2 is a diesel genset.

RE: Can anyone identify these

I spy with my little eye;
Two parallel dampers and they are both connected with a rod and the damper that is visible has an actuator connected to it.
I also see two disconnect switches which indicates that there is fan inside that can be disconnected for maintenance.
I would guess now that on the top there is a fan with a connection flange, with the dampers connected as they are it could be a pressurization system.
Now of there is a coil in it, it could be a heat recovery system, or heat rejection system, but then I would not link the two dampers but control them individually.
The second picture is a gen set as already mentioned.
Well this was my two cents to the guess what it is.
 

RE: Can anyone identify these

if number 2 is a diesel genset, then why does each rocker cover seem to have a spark plug wire sticking out of it?

I would have guessed natural gas.  It's a small I6 - probably around 15L displacement, based on size...  Definitely not a Cat.  Doesn't look like a Cummins 855 though.  Not sure.
 

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